diff --git a/apps/benchmarks/ComplexGeometry/ComplexGeometry.cpp b/apps/benchmarks/ComplexGeometry/ComplexGeometry.cpp
index a9cca407c81d4ff61b905bb58abc754b880b51f5..0f436644770816f6d9fb1ae2b3897e81106c2555 100644
--- a/apps/benchmarks/ComplexGeometry/ComplexGeometry.cpp
+++ b/apps/benchmarks/ComplexGeometry/ComplexGeometry.cpp
@@ -239,7 +239,7 @@ int main( int argc, char * argv[] )
flagFieldId, fluidFlagUID ) ),
"LBM stability check" );
- timeloop.addFuncAfterTimeStep( perfLogger, "PerformanceLogger" );
+ timeloop.addFuncAfterTimeStep( perfLogger, "Evaluator: performance logging" );
// add VTK output to time loop
diff --git a/apps/showcases/CMakeLists.txt b/apps/showcases/CMakeLists.txt
index 6330a83bdde5027a2d0fd8e030862b7bf521dcd4..c6f0534cc6679f996777742823e5901aca8233f4 100644
--- a/apps/showcases/CMakeLists.txt
+++ b/apps/showcases/CMakeLists.txt
@@ -1,6 +1,7 @@
add_subdirectory( BidisperseFluidizedBed )
add_subdirectory( CombinedResolvedUnresolved )
add_subdirectory( FluidizedBed )
+add_subdirectory( FreeSurface )
add_subdirectory( HeatConduction )
add_subdirectory( LightRisingParticleInFluidAMR )
add_subdirectory( Mixer )
@@ -12,3 +13,4 @@ endif()
if ( WALBERLA_BUILD_WITH_CODEGEN AND NOT WALBERLA_BUILD_WITH_OPENMP)
add_subdirectory( PorousMedia )
endif()
+
diff --git a/apps/showcases/FreeSurface/BubblyPoiseuille.cpp b/apps/showcases/FreeSurface/BubblyPoiseuille.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..00ae3e9f495e5ca7f465dcfff85100288eac5842
--- /dev/null
+++ b/apps/showcases/FreeSurface/BubblyPoiseuille.cpp
@@ -0,0 +1,369 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file BubblyPoiseuille.cpp
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//
+// This showcase simulates a plane Poiseuille flow with randomly distributed bubbles in the flow.
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/math/Random.h"
+
+#include "lbm/PerformanceLogger.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface/LoadBalancing.h"
+#include "lbm/free_surface/SurfaceMeshWriter.h"
+#include "lbm/free_surface/VtkWriter.h"
+#include "lbm/free_surface/bubble_model/Geometry.h"
+#include "lbm/free_surface/dynamics/SurfaceDynamicsHandler.h"
+#include "lbm/free_surface/surface_geometry/SurfaceGeometryHandler.h"
+#include "lbm/free_surface/surface_geometry/Utility.h"
+#include "lbm/lattice_model/D3Q19.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace DropInPool
+{
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+
+using CollisionModel_T = lbm::collision_model::SRT;
+using ForceModel_T = lbm::force_model::GuoField< VectorField_T >;
+using LatticeModel_T = lbm::D3Q19< CollisionModel_T, true, ForceModel_T, 2 >;
+using LatticeModelStencil_T = LatticeModel_T::Stencil;
+using PdfField_T = lbm::PdfField< LatticeModel_T >;
+using PdfCommunication_T = blockforest::SimpleCommunication< LatticeModelStencil_T >;
+
+// the geometry computations in SurfaceGeometryHandler require meaningful values in the ghost layers in corner
+// directions (flag field and fill level field); this holds, even if the lattice model uses a D3Q19 stencil
+using CommunicationStencil_T =
+ typename std::conditional< LatticeModel_T::Stencil::D == uint_t(2), stencil::D2Q9, stencil::D3Q27 >::type;
+using Communication_T = blockforest::SimpleCommunication< CommunicationStencil_T >;
+
+using flag_t = uint32_t;
+using FlagField_T = FlagField< flag_t >;
+using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+int main(int argc, char** argv)
+{
+ Environment walberlaEnv(argc, argv);
+
+ if (argc < 2) { WALBERLA_ABORT("Please specify a parameter file as input argument.") }
+
+ // print content of parameter file
+ WALBERLA_LOG_INFO_ON_ROOT(*walberlaEnv.config());
+
+ // get block forest parameters from parameter file
+ auto blockForestParameters = walberlaEnv.config()->getOneBlock("BlockForestParameters");
+ const Vector3< uint_t > cellsPerBlock = blockForestParameters.getParameter< Vector3< uint_t > >("cellsPerBlock");
+ const Vector3< bool > periodicity = blockForestParameters.getParameter< Vector3< bool > >("periodicity");
+ const uint_t loadBalancingFrequency = blockForestParameters.getParameter< uint_t >("loadBalancingFrequency");
+ const bool printLoadBalancingStatistics = blockForestParameters.getParameter< bool >("printLoadBalancingStatistics");
+
+ // read domain parameters from parameter file
+ const auto domainParameters = walberlaEnv.config()->getOneBlock("DomainParameters");
+ const real_t channelWidth = domainParameters.getParameter< real_t >("channelWidth");
+ const Vector3< real_t > domainSizeFactor = domainParameters.getParameter< Vector3< real_t > >("domainSizeFactor");
+ const real_t bubbleDiameter = domainParameters.getParameter< real_t >("bubbleDiameterFactor") * channelWidth;
+ const real_t gasVolumeFraction = domainParameters.getParameter< real_t >("gasVolumeFraction");
+
+ // define domain size
+ Vector3< uint_t > domainSize = domainSizeFactor * channelWidth;
+ domainSize[0] = uint_c(domainSizeFactor[0] * channelWidth);
+ domainSize[1] = uint_c(domainSizeFactor[1] * channelWidth);
+ domainSize[2] = uint_c(domainSizeFactor[2] * channelWidth);
+
+ // compute number of blocks as defined by domainSize and cellsPerBlock
+ Vector3< uint_t > numBlocks;
+ numBlocks[0] = uint_c(std::ceil(real_c(domainSize[0]) / real_c(cellsPerBlock[0])));
+ numBlocks[1] = uint_c(std::ceil(real_c(domainSize[1]) / real_c(cellsPerBlock[1])));
+ numBlocks[2] = uint_c(std::ceil(real_c(domainSize[2]) / real_c(cellsPerBlock[2])));
+
+ // get number of (MPI) processes
+ uint_t numProcesses = uint_c(MPIManager::instance()->numProcesses());
+ WALBERLA_CHECK_LESS_EQUAL(numProcesses, numBlocks[0] * numBlocks[1] * numBlocks[2],
+ "The number of MPI processes is greater than the number of blocks as defined by "
+ "\"domainSize/cellsPerBlock\". This would result in unused MPI processes. Either decrease "
+ "the number of MPI processes or increase \"cellsPerBlock\".")
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(numProcesses);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellsPerBlock);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(numBlocks);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(channelWidth);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(domainSizeFactor);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(periodicity);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(domainSize);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(gasVolumeFraction);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(bubbleDiameter);
+
+ Vector3< uint_t > realDomainSize;
+ realDomainSize[0] = cellsPerBlock[0] * numBlocks[0];
+ realDomainSize[1] = cellsPerBlock[1] * numBlocks[1];
+ realDomainSize[2] = cellsPerBlock[2] * numBlocks[2];
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(realDomainSize);
+
+ if (domainSize[0] != realDomainSize[0] && periodicity[0])
+ {
+ WALBERLA_ABORT(
+ "The specified domain size in x-direction can not be obtained with the number of blocks you specified.")
+ }
+ if (domainSize[1] != realDomainSize[1] && periodicity[1])
+ {
+ WALBERLA_ABORT(
+ "The specified domain size in y-direction can not be obtained with the number of blocks you specified.")
+ }
+ if (domainSize[2] != realDomainSize[2] && periodicity[2])
+ {
+ WALBERLA_ABORT(
+ "The specified domain size in z-direction can not be obtained with the number of blocks you specified.")
+ }
+
+ // read physics parameters from parameter file
+ const auto physicsParameters = walberlaEnv.config()->getOneBlock("PhysicsParameters");
+ const real_t reynoldsNumber = physicsParameters.getParameter< real_t >("reynoldsNumber");
+ const real_t mortonNumber = physicsParameters.getParameter< real_t >("mortonNumber");
+ const real_t relaxationRate = physicsParameters.getParameter< real_t >("relaxationRate");
+
+ const CollisionModel_T collisionModel = CollisionModel_T(relaxationRate);
+ const real_t viscosity = collisionModel.viscosity();
+
+ const real_t forceX = real_c(8) * viscosity * viscosity * reynoldsNumber / real_c(std::pow(channelWidth, 3));
+ const Vector3< real_t > force = Vector3< real_t >(forceX, real_c(0), real_c(0));
+
+ const real_t analMaxVelocity = viscosity * reynoldsNumber / channelWidth;
+
+ const real_t surfaceTension = real_c(std::pow(forceX * real_c(std::pow(viscosity, 4)) / mortonNumber,
+ real_c(1) / real_c(3))); // formula only valid for rho=1
+
+ const bool enableWetting = physicsParameters.getParameter< bool >("enableWetting");
+ const real_t contactAngle = physicsParameters.getParameter< real_t >("contactAngle");
+
+ const uint_t timesteps = physicsParameters.getParameter< uint_t >("timesteps");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(reynoldsNumber);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(mortonNumber);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(relaxationRate);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(surfaceTension);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(force);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableWetting);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(contactAngle);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(timesteps);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(viscosity);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(analMaxVelocity);
+
+ // read model parameters from parameter file
+ const auto modelParameters = walberlaEnv.config()->getOneBlock("ModelParameters");
+ const std::string pdfReconstructionModel = modelParameters.getParameter< std::string >("pdfReconstructionModel");
+ const std::string pdfRefillingModel = modelParameters.getParameter< std::string >("pdfRefillingModel");
+ const std::string excessMassDistributionModel =
+ modelParameters.getParameter< std::string >("excessMassDistributionModel");
+ const std::string curvatureModel = modelParameters.getParameter< std::string >("curvatureModel");
+ const bool enableForceWeighting = modelParameters.getParameter< bool >("enableForceWeighting");
+ const bool useSimpleMassExchange = modelParameters.getParameter< bool >("useSimpleMassExchange");
+ const bool enableBubbleModel = modelParameters.getParameter< bool >("enableBubbleModel");
+ const bool enableBubbleSplits = modelParameters.getParameter< bool >("enableBubbleSplits");
+ const real_t cellConversionThreshold = modelParameters.getParameter< real_t >("cellConversionThreshold");
+ const real_t cellConversionForceThreshold = modelParameters.getParameter< real_t >("cellConversionForceThreshold");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(pdfReconstructionModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(pdfRefillingModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(excessMassDistributionModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(curvatureModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableForceWeighting);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(useSimpleMassExchange);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableBubbleModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableBubbleSplits);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellConversionThreshold);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellConversionForceThreshold);
+
+ // read evaluation parameters from parameter file
+ const auto evaluationParameters = walberlaEnv.config()->getOneBlock("EvaluationParameters");
+ const uint_t performanceLogFrequency = evaluationParameters.getParameter< uint_t >("performanceLogFrequency");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(performanceLogFrequency);
+
+ // create non-uniform block forest (non-uniformity required for load balancing)
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ createNonUniformBlockForest(domainSize, cellsPerBlock, numBlocks, periodicity);
+
+ // add force field
+ const BlockDataID forceFieldID =
+ field::addToStorage< VectorField_T >(blockForest, "Force field", force, field::fzyx, uint_c(1));
+
+ // create lattice model
+ const LatticeModel_T latticeModel = LatticeModel_T(collisionModel, ForceModel_T(forceFieldID));
+
+ // add pdf field
+ const BlockDataID pdfFieldID = lbm::addPdfFieldToStorage(blockForest, "PDF field", latticeModel,
+ Vector3< real_t >(real_c(0)), real_c(1), field::fzyx);
+
+ // add fill level field (initialized with 0, i.e., gas everywhere)
+ const BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill level field", real_c(1.0), field::fzyx, uint_c(2));
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ // initialize parabolic Poiseuille profile
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ PdfField_T* const pdfField = blockIt->getData< PdfField_T >(pdfFieldID);
+
+ WALBERLA_FOR_ALL_CELLS(pdfFieldIt, pdfField, {
+ // get global coordinate (with respect to whole simulation domain) of the currently processed cell
+ Vector3< real_t > globalCellCoordinate = blockForest->getBlockLocalCellCenter(*blockIt, pdfFieldIt.cell());
+
+ const real_t height = real_c(realDomainSize[2]);
+
+ const real_t velocityX =
+ forceX * real_c(0.5) / viscosity * globalCellCoordinate[2] * (height - globalCellCoordinate[2]);
+
+ pdfField->setDensityAndVelocity(pdfFieldIt.cell(), Vector3< real_t >(velocityX, real_c(0), real_c(0)),
+ real_c(1));
+ }); // WALBERLA_FOR_ALL_CELLS
+ }
+
+ const real_t bubbleRadius = bubbleDiameter * real_c(0.5);
+ const real_t domainVolume = real_c(realDomainSize[0] * realDomainSize[1] * realDomainSize[2]);
+ const real_t gasVolume = gasVolumeFraction * domainVolume;
+ const real_t bubbleVolume = real_c(4) / real_c(3) * real_c(math::pi) * real_c(std::pow(bubbleRadius, 3));
+ const uint_t numBubbles = uint_c(gasVolume / bubbleVolume);
+ const real_t realGasVolumeFraction = real_c(numBubbles) * real_c(bubbleVolume) / domainVolume;
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(numBubbles);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(realGasVolumeFraction);
+
+ // randomly place bubbles
+ for (uint_t bubble = uint_c(0); bubble != numBubbles; ++bubble)
+ {
+ walberla::math::seedRandomGenerator(std::mt19937::result_type(bubble));
+ const Vector3< real_t > bubbleCenter =
+ Vector3< real_t >(math::realRandom(bubbleRadius, real_c(realDomainSize[0]) - bubbleRadius),
+ math::realRandom(bubbleRadius, real_c(realDomainSize[1]) - bubbleRadius),
+ math::realRandom(bubbleRadius, real_c(realDomainSize[2]) - bubbleRadius));
+
+ const geometry::Sphere sphereBubble(bubbleCenter, bubbleRadius);
+ bubble_model::addBodyToFillLevelField< geometry::Sphere >(*blockForest, fillFieldID, sphereBubble, true);
+ }
+
+ // initialize boundary conditions from config file
+ const auto boundaryParameters = walberlaEnv.config()->getOneBlock("BoundaryParameters");
+ freeSurfaceBoundaryHandling->initFromConfig(boundaryParameters);
+
+ // IMPORTANT REMARK: this must be only called after every solid flag has been set; otherwise, the boundary handling
+ // might not detect solid flags correctly
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+
+ // communication after initialization
+ Communication_T communication(blockForest, flagFieldID, fillFieldID, forceFieldID);
+ communication();
+
+ PdfCommunication_T pdfCommunication(blockForest, pdfFieldID);
+ pdfCommunication();
+
+ // add bubble model
+ std::shared_ptr< bubble_model::BubbleModelBase > bubbleModel = nullptr;
+ if (enableBubbleModel)
+ {
+ const std::shared_ptr< bubble_model::BubbleModel< CommunicationStencil_T > > bubbleModelDerived =
+ std::make_shared< bubble_model::BubbleModel< CommunicationStencil_T > >(blockForest, enableBubbleSplits);
+ bubbleModelDerived->initFromFillLevelField(fillFieldID);
+
+ bubbleModel = std::static_pointer_cast< bubble_model::BubbleModelBase >(bubbleModelDerived);
+ }
+ else { bubbleModel = std::make_shared< bubble_model::BubbleModelConstantPressure >(real_c(1)); }
+
+ // set density in non-liquid or non-interface cells to 1 (after initializing with hydrostatic pressure)
+ setDensityInNonFluidCellsToOne< FlagField_T, PdfField_T >(blockForest, flagInfo, flagFieldID, pdfFieldID);
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, timesteps);
+
+ // Laplace pressure = 2 * surface tension * curvature; curvature computation is not necessary with 0 surface tension
+ bool computeCurvature = false;
+ if (!realIsEqual(surfaceTension, real_c(0), real_c(1e-14))) { computeCurvature = true; }
+
+ // add surface geometry handler
+ const SurfaceGeometryHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > geometryHandler(
+ blockForest, freeSurfaceBoundaryHandling, fillFieldID, curvatureModel, computeCurvature, enableWetting,
+ contactAngle);
+
+ geometryHandler.addSweeps(timeloop);
+
+ const ConstBlockDataID curvatureFieldID = geometryHandler.getConstCurvatureFieldID();
+ const ConstBlockDataID normalFieldID = geometryHandler.getConstNormalFieldID();
+
+ // add boundary handling for standard boundaries and free surface boundaries
+ const SurfaceDynamicsHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > dynamicsHandler(
+ blockForest, pdfFieldID, flagFieldID, fillFieldID, forceFieldID, normalFieldID, curvatureFieldID,
+ freeSurfaceBoundaryHandling, bubbleModel, pdfReconstructionModel, pdfRefillingModel, excessMassDistributionModel,
+ relaxationRate, force, surfaceTension, enableForceWeighting, useSimpleMassExchange, cellConversionThreshold,
+ cellConversionForceThreshold);
+
+ dynamicsHandler.addSweeps(timeloop);
+
+ // add load balancing
+ const LoadBalancer< FlagField_T, CommunicationStencil_T, LatticeModelStencil_T > loadBalancer(
+ blockForest, communication, pdfCommunication, bubbleModel, uint_c(50), uint_c(10), uint_c(5),
+ loadBalancingFrequency, printLoadBalancingStatistics);
+ timeloop.addFuncAfterTimeStep(loadBalancer, "Sweep: load balancing");
+
+ // add VTK output
+ addVTKOutput< LatticeModel_T, FreeSurfaceBoundaryHandling_T, PdfField_T, FlagField_T, ScalarField_T, VectorField_T >(
+ blockForest, timeloop, walberlaEnv.config(), flagInfo, pdfFieldID, flagFieldID, fillFieldID, forceFieldID,
+ geometryHandler.getCurvatureFieldID(), geometryHandler.getNormalFieldID(),
+ geometryHandler.getObstNormalFieldID());
+
+ // add triangle mesh output of free surface
+ SurfaceMeshWriter< ScalarField_T, FlagField_T > surfaceMeshWriter(
+ blockForest, fillFieldID, flagFieldID, flagIDs::liquidInterfaceGasFlagIDs, real_c(0), walberlaEnv.config());
+ surfaceMeshWriter(); // write initial mesh
+ timeloop.addFuncAfterTimeStep(surfaceMeshWriter, "Writer: surface mesh");
+
+ // add logging for computational performance
+ const lbm::PerformanceLogger< FlagField_T > perfLogger(blockForest, flagFieldID, flagIDs::liquidInterfaceFlagIDs,
+ performanceLogFrequency);
+ timeloop.addFuncAfterTimeStep(perfLogger, "Evaluator: performance logging");
+
+ WcTimingPool timingPool;
+
+ for (uint_t t = uint_c(0); t != timesteps; ++t)
+ {
+ if (t % uint_c(real_c(timesteps / 100)) == uint_c(0))
+ {
+ WALBERLA_LOG_DEVEL_ON_ROOT("Performing timestep = " << t);
+ }
+ timeloop.singleStep(timingPool, true);
+
+ if (t % performanceLogFrequency == uint_c(0) && t > uint_c(0)) { timingPool.logResultOnRoot(); }
+ }
+
+ return EXIT_SUCCESS;
+}
+
+} // namespace DropInPool
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::DropInPool::main(argc, argv); }
\ No newline at end of file
diff --git a/apps/showcases/FreeSurface/BubblyPoiseuille.prm b/apps/showcases/FreeSurface/BubblyPoiseuille.prm
new file mode 100644
index 0000000000000000000000000000000000000000..c6e7d413c5ef6b864f59f6c521542e6ff825a0e4
--- /dev/null
+++ b/apps/showcases/FreeSurface/BubblyPoiseuille.prm
@@ -0,0 +1,108 @@
+BlockForestParameters
+{
+ cellsPerBlock < 20, 20, 20 >;
+ periodicity < 1, 1, 0 >;
+ loadBalancingFrequency 0;
+ printLoadBalancingStatistics false;
+}
+
+DomainParameters
+{
+ channelWidth 100;
+ domainSizeFactor < 2, 1, 1 >; // values multiplied with channelWidth
+ bubbleDiameterFactor 0.1; // value multiplied with channelWidth
+ gasVolumeFraction 0.1;
+}
+
+PhysicsParameters
+{
+ reynoldsNumber 10000;
+ mortonNumber 1e-5;
+ relaxationRate 1.989;
+ enableWetting false;
+ contactAngle 0; // only used if enableWetting=true
+ timesteps 10000;
+}
+
+ModelParameters
+{
+ pdfReconstructionModel OnlyMissing;
+ pdfRefillingModel EquilibriumRefilling;
+ excessMassDistributionModel EvenlyAllInterface;
+ curvatureModel FiniteDifferenceMethod;
+ enableForceWeighting false;
+ useSimpleMassExchange false;
+ enableBubbleModel true;
+ enableBubbleSplits false; // only used if enableBubbleModel=true
+ cellConversionThreshold 1e-2;
+ cellConversionForceThreshold 1e-1;
+}
+
+EvaluationParameters
+{
+ performanceLogFrequency 5000;
+}
+
+BoundaryParameters
+{
+ // X
+ //Border { direction W; walldistance -1; NoSlip{} }
+ //Border { direction E; walldistance -1; NoSlip{} }
+
+ // Y
+ //Border { direction N; walldistance -1; NoSlip{} }
+ //Border { direction S; walldistance -1; NoSlip{} }
+
+ // Z
+ Border { direction T; walldistance -1; NoSlip{} }
+ Border { direction B; walldistance -1; NoSlip{} }
+}
+
+MeshOutputParameters
+{
+ writeFrequency 2170;
+ baseFolder mesh-out;
+}
+
+VTK
+{
+ fluid_field
+ {
+ writeFrequency 2170;
+ ghostLayers 0;
+ baseFolder vtk-out;
+ samplingResolution 1;
+
+ writers
+ {
+ velocity;
+ density;
+ //pdf;
+ flag;
+ fill_level;
+ force;
+ curvature;
+ normal;
+ obstacle_normal;
+ mapped_flag;
+ }
+
+ inclusion_filters
+ {
+ // only include liquid and interface cells in VTK output
+ //liquidInterfaceFilter;
+ }
+
+ before_functions
+ {
+ //ghost_layer_synchronization; // only needed if writing the ghost layer
+ }
+
+ }
+ domain_decomposition
+ {
+ writeFrequency 0;
+ baseFolder vtk-out;
+ outputDomainDecomposition true;
+ }
+}
\ No newline at end of file
diff --git a/apps/showcases/FreeSurface/CMakeLists.txt b/apps/showcases/FreeSurface/CMakeLists.txt
new file mode 100644
index 0000000000000000000000000000000000000000..0e6edd5b2290c74048a0fcc2c34c8f4423c00178
--- /dev/null
+++ b/apps/showcases/FreeSurface/CMakeLists.txt
@@ -0,0 +1,48 @@
+waLBerla_link_files_to_builddir( *.prm )
+
+waLBerla_add_executable(NAME BubblyPoiseuille
+ FILES BubblyPoiseuille.cpp
+ DEPENDS blockforest boundary core domain_decomposition field lbm postprocessing timeloop vtk)
+
+waLBerla_add_executable(NAME CapillaryWave
+ FILES CapillaryWave.cpp
+ DEPENDS blockforest boundary core domain_decomposition field lbm postprocessing timeloop vtk)
+
+waLBerla_add_executable(NAME DamBreakCylindrical
+ FILES DamBreakCylindrical.cpp
+ DEPENDS blockforest boundary core domain_decomposition field lbm postprocessing timeloop vtk)
+
+waLBerla_add_executable(NAME DamBreakRectangular
+ FILES DamBreakRectangular.cpp
+ DEPENDS blockforest boundary core domain_decomposition field lbm postprocessing timeloop vtk)
+
+waLBerla_add_executable(NAME DropImpact
+ FILES DropImpact.cpp
+ DEPENDS blockforest boundary core domain_decomposition field lbm postprocessing timeloop vtk)
+
+waLBerla_add_executable(NAME DropWetting
+ FILES DropWetting.cpp
+ DEPENDS blockforest boundary core domain_decomposition field lbm postprocessing timeloop vtk)
+
+waLBerla_add_executable(NAME GravityWave
+ FILES GravityWave.cpp
+ DEPENDS blockforest boundary core domain_decomposition field lbm postprocessing timeloop vtk)
+
+if( WALBERLA_BUILD_WITH_CODEGEN )
+ walberla_generate_target_from_python( NAME GravityWaveLatticeModelGeneration
+ FILE GravityWaveLatticeModelGeneration.py
+ OUT_FILES GravityWaveLatticeModel.cpp GravityWaveLatticeModel.h )
+
+ waLBerla_add_executable(NAME GravityWaveCodegen
+ FILES GravityWaveCodegen.cpp
+ DEPENDS blockforest boundary core domain_decomposition field lbm postprocessing timeloop vtk
+ GravityWaveLatticeModelGeneration)
+endif()
+
+waLBerla_add_executable(NAME RisingBubble
+ FILES RisingBubble.cpp
+ DEPENDS blockforest boundary core domain_decomposition field lbm postprocessing timeloop vtk)
+
+waLBerla_add_executable(NAME TaylorBubble
+ FILES TaylorBubble.cpp
+ DEPENDS blockforest boundary core domain_decomposition field lbm postprocessing timeloop vtk)
diff --git a/apps/showcases/FreeSurface/CapillaryWave.cpp b/apps/showcases/FreeSurface/CapillaryWave.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..d36003bc023db76f5b65c256c02857040452d278
--- /dev/null
+++ b/apps/showcases/FreeSurface/CapillaryWave.cpp
@@ -0,0 +1,473 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file CapillaryWave.cpp
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//
+// This showcase simulates a standing wave purely governed by surface tension forces, i.e., without any body forces
+// such as gravity
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+
+#include "lbm/PerformanceLogger.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface/LoadBalancing.h"
+#include "lbm/free_surface/SurfaceMeshWriter.h"
+#include "lbm/free_surface/TotalMassComputer.h"
+#include "lbm/free_surface/VtkWriter.h"
+#include "lbm/free_surface/dynamics/SurfaceDynamicsHandler.h"
+#include "lbm/free_surface/surface_geometry/SurfaceGeometryHandler.h"
+#include "lbm/free_surface/surface_geometry/Utility.h"
+#include "lbm/lattice_model/D2Q9.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace CapillaryWave
+{
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+
+using CollisionModel_T = lbm::collision_model::SRT;
+using ForceModel_T = lbm::force_model::GuoField< VectorField_T >;
+using LatticeModel_T = lbm::D2Q9< CollisionModel_T, true, ForceModel_T, 2 >;
+using LatticeModelStencil_T = LatticeModel_T::Stencil;
+using PdfField_T = lbm::PdfField< LatticeModel_T >;
+using PdfCommunication_T = blockforest::SimpleCommunication< LatticeModelStencil_T >;
+
+// the geometry computations in SurfaceGeometryHandler require meaningful values in the ghost layers in corner
+// directions (flag field and fill level field); this holds, even if the lattice model uses a D3Q19 stencil
+using CommunicationStencil_T =
+ typename std::conditional< LatticeModel_T::Stencil::D == uint_t(2), stencil::D2Q9, stencil::D3Q27 >::type;
+using Communication_T = blockforest::SimpleCommunication< CommunicationStencil_T >;
+
+using flag_t = uint32_t;
+using FlagField_T = FlagField< flag_t >;
+using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+// write each entry in "vector" to line in a file; columns are separated by tabs
+template< typename T >
+void writeVectorToFile(const std::vector< T >& vector, const std::string& filename);
+
+// function describing the global initialization profile
+inline real_t initializationProfile(real_t x, real_t amplitude, real_t offset, real_t wavelength)
+{
+ return amplitude * std::cos(x / wavelength * real_c(2) * math::pi + math::pi) + offset;
+}
+
+// get interface position in y-direction at the specified (global) x-coordinate
+template< typename FreeSurfaceBoundaryHandling_T >
+class SurfaceYPositionEvaluator
+{
+ public:
+ SurfaceYPositionEvaluator(const std::weak_ptr< const StructuredBlockForest >& blockForest,
+ const std::weak_ptr< const FreeSurfaceBoundaryHandling_T >& freeSurfaceBoundaryHandling,
+ const ConstBlockDataID& fillFieldID, const Vector3< uint_t >& domainSize,
+ cell_idx_t globalXCoordinate, uint_t frequency,
+ const std::shared_ptr< real_t >& surfaceYPosition)
+ : blockForest_(blockForest), freeSurfaceBoundaryHandling_(freeSurfaceBoundaryHandling), fillFieldID_(fillFieldID),
+ domainSize_(domainSize), globalXCoordinate_(globalXCoordinate), surfaceYPosition_(surfaceYPosition),
+ frequency_(frequency), executionCounter_(uint_c(0))
+ {}
+
+ void operator()()
+ {
+ auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ auto freeSurfaceBoundaryHandling = freeSurfaceBoundaryHandling_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(freeSurfaceBoundaryHandling);
+
+ ++executionCounter_;
+
+ // only evaluate in given frequencies
+ if (executionCounter_ % frequency_ != uint_c(0) && executionCounter_ != uint_c(1)) { return; }
+
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ *surfaceYPosition_ = real_c(0);
+
+ CellInterval globalSearchInterval(globalXCoordinate_, cell_idx_c(0), cell_idx_c(0), globalXCoordinate_,
+ cell_idx_c(domainSize_[1]), cell_idx_c(0));
+
+ if (blockForest->getBlockCellBB(*blockIt).overlaps(globalSearchInterval))
+ {
+ // transform specified global x-coordinate into block local coordinate
+ Cell localEvalCell = Cell(globalXCoordinate_, cell_idx_c(0), cell_idx_c(0));
+ blockForest->transformGlobalToBlockLocalCell(localEvalCell, *blockIt);
+
+ const FlagField_T* const flagField = blockIt->template getData< const FlagField_T >(flagFieldID);
+ const ScalarField_T* const fillField = blockIt->template getData< const ScalarField_T >(fillFieldID_);
+
+ // searching from top ensures that the interface cell with the greatest y-coordinate is found first
+ for (cell_idx_t y = cell_idx_c((flagField)->ySize() - uint_c(1)); y >= cell_idx_t(0); --y)
+ {
+ if (flagInfo.isInterface(flagField->get(localEvalCell[0], y, cell_idx_c(0))))
+ {
+ const real_t fillLevel = fillField->get(localEvalCell[0], y, cell_idx_c(0));
+
+ // transform local y-coordinate to global coordinate
+ Cell localResultCell = localEvalCell;
+ localResultCell[1] = y;
+ blockForest->transformBlockLocalToGlobalCell(localResultCell, *blockIt);
+ *surfaceYPosition_ = real_c(localResultCell[1]) + fillLevel;
+
+ break;
+ }
+ }
+ }
+ }
+ // communicate result among all processes
+ mpi::allReduceInplace< real_t >(*surfaceYPosition_, mpi::MAX);
+ }
+
+ private:
+ std::weak_ptr< const StructuredBlockForest > blockForest_;
+ std::weak_ptr< const FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling_;
+ ConstBlockDataID fillFieldID_;
+ Vector3< uint_t > domainSize_;
+ cell_idx_t globalXCoordinate_;
+ std::shared_ptr< real_t > surfaceYPosition_;
+
+ uint_t frequency_;
+ uint_t executionCounter_;
+}; // class SurfaceYPositionEvaluator
+
+int main(int argc, char** argv)
+{
+ Environment walberlaEnv(argc, argv);
+
+ if (argc < 2) { WALBERLA_ABORT("Please specify a parameter file as input argument.") }
+
+ // print content of parameter file
+ WALBERLA_LOG_INFO_ON_ROOT(*walberlaEnv.config());
+
+ // get block forest parameters from parameter file
+ auto blockForestParameters = walberlaEnv.config()->getOneBlock("BlockForestParameters");
+ const Vector3< uint_t > cellsPerBlock = blockForestParameters.getParameter< Vector3< uint_t > >("cellsPerBlock");
+ const Vector3< bool > periodicity = blockForestParameters.getParameter< Vector3< bool > >("periodicity");
+ const uint_t loadBalancingFrequency = blockForestParameters.getParameter< uint_t >("loadBalancingFrequency");
+ const bool printLoadBalancingStatistics = blockForestParameters.getParameter< bool >("printLoadBalancingStatistics");
+
+ // get domain parameters from parameter file
+ auto domainParameters = walberlaEnv.config()->getOneBlock("DomainParameters");
+ const uint_t domainWidth = domainParameters.getParameter< uint_t >("domainWidth");
+ const real_t liquidDepth = domainParameters.getParameter< real_t >("liquidDepth");
+ const real_t initialAmplitude = domainParameters.getParameter< real_t >("initialAmplitude");
+
+ // define domain size
+ Vector3< uint_t > domainSize;
+ domainSize[0] = domainWidth;
+ domainSize[1] = uint_c(liquidDepth * real_c(2));
+ domainSize[2] = uint_c(1);
+
+ // compute number of blocks as defined by domainSize and cellsPerBlock
+ Vector3< uint_t > numBlocks;
+ numBlocks[0] = uint_c(std::ceil(real_c(domainSize[0]) / real_c(cellsPerBlock[0])));
+ numBlocks[1] = uint_c(std::ceil(real_c(domainSize[1]) / real_c(cellsPerBlock[1])));
+ numBlocks[2] = uint_c(std::ceil(real_c(domainSize[2]) / real_c(cellsPerBlock[2])));
+
+ // get number of (MPI) processes
+ uint_t numProcesses = uint_c(MPIManager::instance()->numProcesses());
+ WALBERLA_CHECK_LESS_EQUAL(numProcesses, numBlocks[0] * numBlocks[1] * numBlocks[2],
+ "The number of MPI processes is greater than the number of blocks as defined by "
+ "\"domainSize/cellsPerBlock\". This would result in unused MPI processes. Either decrease "
+ "the number of MPI processes or increase \"cellsPerBlock\".")
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(numProcesses);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellsPerBlock);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(domainSize);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(numBlocks);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(domainWidth);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(liquidDepth);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(initialAmplitude);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(periodicity);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(loadBalancingFrequency);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(printLoadBalancingStatistics);
+
+ // get physics parameters from parameter file
+ auto physicsParameters = walberlaEnv.config()->getOneBlock("PhysicsParameters");
+ const uint_t timesteps = physicsParameters.getParameter< uint_t >("timesteps");
+
+ const real_t relaxationRate = physicsParameters.getParameter< real_t >("relaxationRate");
+ const CollisionModel_T collisionModel = CollisionModel_T(relaxationRate);
+ const real_t viscosity = collisionModel.viscosity();
+
+ const real_t reynoldsNumber = physicsParameters.getParameter< real_t >("reynoldsNumber");
+ const real_t waveNumber = real_c(2) * math::pi / real_c(domainSize[0]);
+ const real_t waveFrequency = reynoldsNumber * viscosity / real_c(domainSize[0]) / initialAmplitude;
+
+ // sum of both phases' densities is implicitly neglected here (would be factor of 1)
+ const real_t surfaceTension = waveFrequency * waveFrequency / std::pow(waveNumber, real_c(3));
+
+ const bool enableWetting = physicsParameters.getParameter< bool >("enableWetting");
+ const real_t contactAngle = physicsParameters.getParameter< real_t >("contactAngle");
+
+ const Vector3< real_t > force = Vector3< real_t >(real_c(0));
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(reynoldsNumber);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(relaxationRate);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableWetting);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(contactAngle);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(timesteps);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(viscosity);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(force);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(surfaceTension);
+
+ // read model parameters from parameter file
+ const auto modelParameters = walberlaEnv.config()->getOneBlock("ModelParameters");
+ const std::string pdfReconstructionModel = modelParameters.getParameter< std::string >("pdfReconstructionModel");
+ const std::string pdfRefillingModel = modelParameters.getParameter< std::string >("pdfRefillingModel");
+ const std::string excessMassDistributionModel =
+ modelParameters.getParameter< std::string >("excessMassDistributionModel");
+ const std::string curvatureModel = modelParameters.getParameter< std::string >("curvatureModel");
+ const bool enableForceWeighting = modelParameters.getParameter< bool >("enableForceWeighting");
+ const bool useSimpleMassExchange = modelParameters.getParameter< bool >("useSimpleMassExchange");
+ const real_t cellConversionThreshold = modelParameters.getParameter< real_t >("cellConversionThreshold");
+ const real_t cellConversionForceThreshold = modelParameters.getParameter< real_t >("cellConversionForceThreshold");
+ const bool enableBubbleModel = modelParameters.getParameter< bool >("enableBubbleModel");
+ const bool enableBubbleSplits = modelParameters.getParameter< bool >("enableBubbleSplits");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(pdfReconstructionModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(pdfRefillingModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(excessMassDistributionModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(curvatureModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableForceWeighting);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(useSimpleMassExchange);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellConversionThreshold);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellConversionForceThreshold);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableBubbleModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableBubbleSplits);
+
+ // read evaluation parameters from parameter file
+ const auto evaluationParameters = walberlaEnv.config()->getOneBlock("EvaluationParameters");
+ const uint_t performanceLogFrequency = evaluationParameters.getParameter< uint_t >("performanceLogFrequency");
+ const uint_t evaluationFrequency = evaluationParameters.getParameter< uint_t >("evaluationFrequency");
+ const std::string filename = evaluationParameters.getParameter< std::string >("filename");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(performanceLogFrequency);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(evaluationFrequency);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(filename);
+
+ // create non-uniform block forest (non-uniformity required for load balancing)
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ createNonUniformBlockForest(domainSize, cellsPerBlock, numBlocks, periodicity);
+
+ // add force field
+ const BlockDataID forceFieldID =
+ field::addToStorage< VectorField_T >(blockForest, "Force field", force, field::fzyx, uint_c(1));
+
+ // create lattice model
+ const LatticeModel_T latticeModel = LatticeModel_T(collisionModel, ForceModel_T(forceFieldID));
+
+ // add pdf field
+ const BlockDataID pdfFieldID = lbm::addPdfFieldToStorage(blockForest, "PDF field", latticeModel, field::fzyx);
+
+ // add fill level field (initialized with 0, i.e., gas everywhere)
+ const BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill level field", real_c(0.0), field::fzyx, uint_c(2));
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ // samples used in the Monte-Carlo like estimation of the fill level
+ const uint_t fillLevelInitSamples = uint_c(100); // actually there will be 101 since 0 is also included
+
+ const uint_t numTotalPoints = (fillLevelInitSamples + uint_c(1)) * (fillLevelInitSamples + uint_c(1));
+ const real_t stepsize = real_c(1) / real_c(fillLevelInitSamples);
+
+ // initialize sine profile such that there is exactly one period; every length is normalized with domainSize[0]
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ ScalarField_T* const fillField = blockIt->getData< ScalarField_T >(fillFieldID);
+
+ WALBERLA_FOR_ALL_CELLS(fillFieldIt, fillField, {
+ // cell in block-local coordinates
+ const Cell localCell = fillFieldIt.cell();
+
+ // get cell in global coordinates
+ Cell globalCell = fillFieldIt.cell();
+ blockForest->transformBlockLocalToGlobalCell(globalCell, *blockIt, localCell);
+
+ // Monte-Carlo like estimation of the fill level:
+ // create uniformly-distributed sample points in each cell and count the number of points below the sine
+ // profile; this fraction of points is used as the fill level to initialize the profile
+ uint_t numPointsBelow = uint_c(0);
+
+ for (uint_t xSample = uint_c(0); xSample <= fillLevelInitSamples; ++xSample)
+ {
+ // value of the sine-function
+ const real_t functionValue = initializationProfile(real_c(globalCell[0]) + real_c(xSample) * stepsize,
+ initialAmplitude, liquidDepth, real_c(domainSize[0]));
+
+ for (uint_t ySample = uint_c(0); ySample <= fillLevelInitSamples; ++ySample)
+ {
+ const real_t yPoint = real_c(globalCell[1]) + real_c(ySample) * stepsize;
+ // with operator <, a fill level of 1 can not be reached when the line is equal to the cell's top border;
+ // with operator <=, a fill level of 0 can not be reached when the line is equal to the cell's bottom
+ // border
+ if (yPoint < functionValue) { ++numPointsBelow; }
+ }
+ }
+
+ // fill level is fraction of points below sine profile
+ fillField->get(localCell) = real_c(numPointsBelow) / real_c(numTotalPoints);
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ // initialize domain boundary conditions from config file
+ const auto boundaryParameters = walberlaEnv.config()->getOneBlock("BoundaryParameters");
+ freeSurfaceBoundaryHandling->initFromConfig(boundaryParameters);
+
+ // IMPORTANT REMARK: this must be only called after every solid flag has been set; otherwise, the boundary handling
+ // might not detect solid flags correctly
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+
+ // communication after initialization
+ Communication_T communication(blockForest, flagFieldID, fillFieldID, forceFieldID);
+ communication();
+
+ PdfCommunication_T pdfCommunication(blockForest, pdfFieldID);
+ pdfCommunication();
+
+ // add bubble model
+ std::shared_ptr< bubble_model::BubbleModelBase > bubbleModel = nullptr;
+ if (enableBubbleModel)
+ {
+ const std::shared_ptr< bubble_model::BubbleModel< CommunicationStencil_T > > bubbleModelDerived =
+ std::make_shared< bubble_model::BubbleModel< CommunicationStencil_T > >(blockForest, enableBubbleSplits);
+ bubbleModelDerived->initFromFillLevelField(fillFieldID);
+ bubbleModelDerived->setAtmosphere(Cell(domainSize[0] - uint_c(1), domainSize[1] - uint_c(1), uint_c(0)),
+ real_c(1));
+
+ bubbleModel = std::static_pointer_cast< bubble_model::BubbleModelBase >(bubbleModelDerived);
+ }
+ else { bubbleModel = std::make_shared< bubble_model::BubbleModelConstantPressure >(real_c(1)); }
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, timesteps);
+
+ // Laplace pressure = 2 * surface tension * curvature; curvature computation is not necessary with 0 surface tension
+ bool computeCurvature = false;
+ if (!realIsEqual(surfaceTension, real_c(0), real_c(1e-14))) { computeCurvature = true; }
+
+ // add surface geometry handler
+ const SurfaceGeometryHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > geometryHandler(
+ blockForest, freeSurfaceBoundaryHandling, fillFieldID, curvatureModel, computeCurvature, enableWetting,
+ contactAngle);
+
+ geometryHandler.addSweeps(timeloop);
+
+ // get fields created by surface geometry handler
+ const ConstBlockDataID curvatureFieldID = geometryHandler.getConstCurvatureFieldID();
+ const ConstBlockDataID normalFieldID = geometryHandler.getConstNormalFieldID();
+
+ // add boundary handling for standard boundaries and free surface boundaries
+ const SurfaceDynamicsHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > dynamicsHandler(
+ blockForest, pdfFieldID, flagFieldID, fillFieldID, forceFieldID, normalFieldID, curvatureFieldID,
+ freeSurfaceBoundaryHandling, bubbleModel, pdfReconstructionModel, pdfRefillingModel, excessMassDistributionModel,
+ relaxationRate, force, surfaceTension, enableForceWeighting, useSimpleMassExchange, cellConversionThreshold,
+ cellConversionForceThreshold);
+
+ dynamicsHandler.addSweeps(timeloop);
+
+ // add load balancing
+ LoadBalancer< FlagField_T, CommunicationStencil_T, LatticeModelStencil_T > loadBalancer(
+ blockForest, communication, pdfCommunication, bubbleModel, uint_c(50), uint_c(10), uint_c(5),
+ loadBalancingFrequency, printLoadBalancingStatistics);
+ timeloop.addFuncAfterTimeStep(loadBalancer, "Sweep: load balancing");
+
+ // add sweep for evaluating the surface position in y-direction
+ const std::shared_ptr< real_t > surfaceYPosition = std::make_shared< real_t >(real_c(0));
+ const SurfaceYPositionEvaluator< FreeSurfaceBoundaryHandling_T > positionEvaluator(
+ blockForest, freeSurfaceBoundaryHandling, fillFieldID, domainSize,
+ cell_idx_c(real_c(0.5) * real_c(domainSize[0])), evaluationFrequency, surfaceYPosition);
+ timeloop.addFuncAfterTimeStep(positionEvaluator, "Evaluator: surface position");
+
+ // add VTK output
+ addVTKOutput< LatticeModel_T, FreeSurfaceBoundaryHandling_T, PdfField_T, FlagField_T, ScalarField_T, VectorField_T >(
+ blockForest, timeloop, walberlaEnv.config(), flagInfo, pdfFieldID, flagFieldID, fillFieldID, forceFieldID,
+ geometryHandler.getCurvatureFieldID(), geometryHandler.getNormalFieldID(),
+ geometryHandler.getObstNormalFieldID());
+
+ // add triangle mesh output of free surface
+ SurfaceMeshWriter< ScalarField_T, FlagField_T > surfaceMeshWriter(
+ blockForest, fillFieldID, flagFieldID, flagIDs::liquidInterfaceGasFlagIDs, real_c(0), walberlaEnv.config());
+ surfaceMeshWriter(); // write initial mesh
+ timeloop.addFuncAfterTimeStep(surfaceMeshWriter, "Writer: surface mesh");
+
+ // add logging for computational performance
+ const lbm::PerformanceLogger< FlagField_T > perfLogger(blockForest, flagFieldID, flagIDs::liquidInterfaceFlagIDs,
+ performanceLogFrequency);
+ timeloop.addFuncAfterTimeStep(perfLogger, "Evaluator: performance logging");
+
+ WcTimingPool timingPool;
+
+ for (uint_t t = uint_c(0); t != timesteps; ++t)
+ {
+ timeloop.singleStep(timingPool, true);
+
+ WALBERLA_ROOT_SECTION()
+ {
+ // non-dimensionalize time and surface position
+ const real_t tNonDimensional = real_c(t) * waveFrequency;
+ const real_t positionNonDimensional = (*surfaceYPosition - liquidDepth) / initialAmplitude;
+
+ const std::vector< real_t > resultVector{ tNonDimensional, positionNonDimensional };
+ if (t % evaluationFrequency == uint_c(0))
+ {
+ WALBERLA_LOG_DEVEL("time step = " << t);
+ WALBERLA_LOG_DEVEL("\t\ttNonDimensional = " << tNonDimensional
+ << "\n\t\tpositionNonDimensional = " << positionNonDimensional);
+ writeVectorToFile(resultVector, filename);
+ }
+ }
+
+ if (t % performanceLogFrequency == uint_c(0) && t > uint_c(0)) { timingPool.logResultOnRoot(); }
+ }
+
+ return EXIT_SUCCESS;
+}
+
+template< typename T >
+void writeVectorToFile(const std::vector< T >& vector, const std::string& filename)
+{
+ std::fstream file;
+ file.open(filename, std::fstream::app);
+
+ for (const auto i : vector)
+ {
+ file << "\t" << i;
+ }
+
+ file << "\n";
+ file.close();
+}
+
+} // namespace CapillaryWave
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::CapillaryWave::main(argc, argv); }
\ No newline at end of file
diff --git a/apps/showcases/FreeSurface/CapillaryWave.prm b/apps/showcases/FreeSurface/CapillaryWave.prm
new file mode 100644
index 0000000000000000000000000000000000000000..8d172cadd60e0b0ed616fb4c724c814a2ca23dde
--- /dev/null
+++ b/apps/showcases/FreeSurface/CapillaryWave.prm
@@ -0,0 +1,107 @@
+BlockForestParameters
+{
+ cellsPerBlock < 25, 25, 1 >;
+ periodicity < 1, 0, 1 >;
+ loadBalancingFrequency 50;
+ printLoadBalancingStatistics true;
+}
+
+DomainParameters
+{
+ domainWidth 50; // equivalent to wavelength
+ liquidDepth 25;
+ initialAmplitude 0.5;
+}
+
+PhysicsParameters
+{
+ reynoldsNumber 10;
+ relaxationRate 1.8;
+ enableWetting false;
+ contactAngle 0; // only used if enableWetting=true
+ timesteps 10000;
+}
+
+ModelParameters
+{
+ pdfReconstructionModel OnlyMissing;
+ pdfRefillingModel EquilibriumRefilling;
+ excessMassDistributionModel EvenlyAllInterface;
+ curvatureModel FiniteDifferenceMethod;
+ enableForceWeighting false;
+ useSimpleMassExchange false;
+ cellConversionThreshold 1e-2;
+ cellConversionForceThreshold 1e-1;
+
+ enableBubbleModel false;
+ enableBubbleSplits false; // only used if enableBubbleModel=true
+}
+
+EvaluationParameters
+{
+ performanceLogFrequency 5000;
+ evaluationFrequency 100;
+ filename capillary-wave.txt;
+}
+
+BoundaryParameters
+{
+ // X
+ //Border { direction W; walldistance -1; NoSlip{} }
+ //Border { direction E; walldistance -1; NoSlip{} }
+
+ // Y
+ Border { direction N; walldistance -1; NoSlip{} }
+ Border { direction S; walldistance -1; NoSlip{} }
+
+ // Z
+ //Border { direction T; walldistance -1; NoSlip{} }
+ //Border { direction B; walldistance -1; NoSlip{} }
+}
+
+MeshOutputParameters
+{
+ writeFrequency 100;
+ baseFolder mesh-out;
+}
+
+VTK
+{
+ fluid_field
+ {
+ writeFrequency 100;
+ ghostLayers 0;
+ baseFolder vtk-out;
+ samplingResolution 1;
+
+ writers
+ {
+ fill_level;
+ mapped_flag;
+ velocity;
+ density;
+ //curvature;
+ //normal;
+ //obstacle_normal;
+ //pdf;
+ //flag;
+ //force;
+ }
+
+ inclusion_filters
+ {
+ //liquidInterfaceFilter; // only include liquid and interface cells in VTK output
+ }
+
+ before_functions
+ {
+ //ghost_layer_synchronization; // only needed if writing the ghost layer
+ }
+ }
+ domain_decomposition
+ {
+ writeFrequency 100;
+ baseFolder vtk-out;
+ outputDomainDecomposition true;
+ }
+}
\ No newline at end of file
diff --git a/apps/showcases/FreeSurface/DamBreakCylindrical.cpp b/apps/showcases/FreeSurface/DamBreakCylindrical.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..129cda8de97d38b1c4d0b48614d0a09ced8f70ea
--- /dev/null
+++ b/apps/showcases/FreeSurface/DamBreakCylindrical.cpp
@@ -0,0 +1,606 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file DamBreakCylindrical.cpp
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//
+// This showcase simulates the collapse of a cylindrical liquid column in 3D. Reference experiments are available from
+// Martin, Moyce (1952), doi:10.1098/rsta.1952.0006
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/math/DistributedSample.h"
+#include "core/math/Sample.h"
+
+#include "field/Gather.h"
+
+#include "lbm/PerformanceLogger.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface/LoadBalancing.h"
+#include "lbm/free_surface/SurfaceMeshWriter.h"
+#include "lbm/free_surface/VtkWriter.h"
+#include "lbm/free_surface/bubble_model/Geometry.h"
+#include "lbm/free_surface/dynamics/SurfaceDynamicsHandler.h"
+#include "lbm/free_surface/surface_geometry/SurfaceGeometryHandler.h"
+#include "lbm/free_surface/surface_geometry/Utility.h"
+#include "lbm/lattice_model/D3Q19.h"
+
+#include "stencil/D3Q27.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace DamBreakCylindrical
+{
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+
+using CollisionModel_T = lbm::collision_model::SRTField< ScalarField_T >;
+using ForceModel_T = lbm::force_model::GuoField< VectorField_T >;
+using LatticeModel_T = lbm::D3Q19< CollisionModel_T, true, ForceModel_T, 2 >;
+using LatticeModelStencil_T = LatticeModel_T::Stencil;
+using PdfField_T = lbm::PdfField< LatticeModel_T >;
+using PdfCommunication_T = blockforest::SimpleCommunication< LatticeModelStencil_T >;
+
+// the geometry computations in SurfaceGeometryHandler require meaningful values in the ghost layers in corner
+// directions (flag field and fill level field); this holds, even if the lattice model uses a D3Q19 stencil
+using CommunicationStencil_T =
+ typename std::conditional< LatticeModel_T::Stencil::D == uint_t(2), stencil::D2Q9, stencil::D3Q27 >::type;
+using Communication_T = blockforest::SimpleCommunication< CommunicationStencil_T >;
+
+using flag_t = uint32_t;
+using FlagField_T = FlagField< flag_t >;
+using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+template< typename T >
+void writeNumberVector(const std::vector< T >& numberVector, const uint_t& timestep, const std::string& filename)
+{
+ std::fstream file;
+ file.open(filename, std::fstream::app);
+
+ file << timestep;
+ for (const auto number : numberVector)
+ {
+ file << "\t" << number;
+ }
+
+ file << "\n";
+ file.close();
+}
+
+// get statistical Sample of column width, i.e., radius of the liquid front at the bottom layer (y=0); the center point
+// of the cylindrical column is assumed to be constant throughout the simulations
+// IMPORTANT REMARK: This implementation is not very efficient, as it gathers a slice of the whole flag field on a
+// single process to perform the evaluation.
+template< typename FreeSurfaceBoundaryHandling_T >
+class columnRadiusEvaluator
+{
+ public:
+ columnRadiusEvaluator(const std::weak_ptr< StructuredBlockForest >& blockForest,
+ const std::weak_ptr< const FreeSurfaceBoundaryHandling_T >& freeSurfaceBoundaryHandling,
+ const Vector3< uint_t >& domainSize, const Vector3< real_t >& initialOrigin, uint_t interval,
+ const std::shared_ptr< math::Sample >& columnRadiusSample)
+ : blockForest_(blockForest), freeSurfaceBoundaryHandling_(freeSurfaceBoundaryHandling), domainSize_(domainSize),
+ initialOrigin_(initialOrigin), columnRadiusSample_(columnRadiusSample), interval_(interval),
+ executionCounter_(uint_c(0))
+ {}
+
+ void operator()()
+ {
+ auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ auto freeSurfaceBoundaryHandling = freeSurfaceBoundaryHandling_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(freeSurfaceBoundaryHandling);
+
+ ++executionCounter_;
+
+ // only evaluate in given intervals
+ if (executionCounter_ % interval_ != uint_c(0)) { return; }
+
+ // gather a slice of the flag field on rank 0 (WARNING: simple, but inefficient)
+ std::shared_ptr< FlagField_T > flagFieldGathered = nullptr;
+ WALBERLA_ROOT_SECTION()
+ {
+ flagFieldGathered = std::make_shared< FlagField_T >(domainSize_[0], uint_c(1), domainSize_[2], uint_c(0));
+ }
+ field::gatherSlice< FlagField_T, FlagField_T >(
+ *flagFieldGathered, blockForest, freeSurfaceBoundaryHandling->getFlagFieldID(), 1, cell_idx_c(0), 0);
+
+ WALBERLA_ROOT_SECTION()
+ {
+ columnRadiusSample_->clear();
+
+ const Cell startCell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0));
+
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo =
+ freeSurfaceBoundaryHandling->getFlagInfo();
+ WALBERLA_CHECK(flagInfo.isGas(flagFieldGathered->get(startCell)),
+ "The \"startCell\" in columnRadiusEvaluator's flood fill algorithm must be a gas cell.");
+
+ getRadiusFromFloodFill(flagFieldGathered, startCell, *columnRadiusSample_);
+ }
+ }
+
+ void getRadiusFromFloodFill(const std::shared_ptr< FlagField_T >& flagFieldGathered, const Cell& startCell,
+ math::Sample& columnRadiusSample)
+ {
+ WALBERLA_CHECK_EQUAL(startCell.y(), cell_idx_c(0),
+ "columnRadiusEvaluator is meant to be search at the domain's bottom layer only (at y=0).");
+
+ auto freeSurfaceBoundaryHandling = freeSurfaceBoundaryHandling_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(freeSurfaceBoundaryHandling);
+
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ std::queue< Cell > cellQueue;
+ cellQueue.push(startCell);
+
+ while (!cellQueue.empty())
+ {
+ Cell cell = cellQueue.front();
+ cellQueue.pop();
+
+ if (flagInfo.isGas(flagFieldGathered->get(cell)))
+ {
+ // remove flag such that cell is not detected as gas when searching from neighboring cells
+ flagFieldGathered->get(cell) = flag_t(0);
+
+ for (auto dir = stencil::D3Q27::beginNoCenter(); dir != stencil::D3Q27::end(); ++dir)
+ {
+ // only search at y=0
+ if (dir.cy() != 0) { continue; }
+
+ const Cell neighborCell = Cell(cell.x() + dir.cx(), cell.y() + dir.cy(), cell.z() + dir.cz());
+
+ // make sure that the algorithm stays within the field dimensions
+ if (neighborCell.x() >= cell_idx_c(0) && neighborCell.x() < cell_idx_c(flagFieldGathered->xSize()) &&
+ neighborCell.y() >= cell_idx_c(0) && neighborCell.y() < cell_idx_c(flagFieldGathered->ySize()) &&
+ neighborCell.z() >= cell_idx_c(0) && neighborCell.z() < cell_idx_c(flagFieldGathered->zSize()))
+ {
+ // add neighboring cell to queue
+ cellQueue.push(neighborCell);
+ }
+ }
+ }
+ else
+ {
+ if (flagInfo.isInterface(flagFieldGathered->get(cell)))
+ {
+ // get center point of this cell; directly use y=0 here
+ const Vector3< real_t > cellCenter(real_c(cell.x()) + real_c(0.5), real_c(0),
+ real_c(cell.z()) + real_c(0.5));
+
+ const real_t radius = (initialOrigin_ - cellCenter).length();
+
+ columnRadiusSample.castToRealAndInsert(radius);
+ } // else: cell is neither gas, nor interface => do nothing
+ }
+ }
+ }
+
+ private:
+ std::weak_ptr< StructuredBlockForest > blockForest_;
+ std::weak_ptr< const FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling_;
+ Vector3< uint_t > domainSize_;
+ Vector3< real_t > initialOrigin_;
+ std::shared_ptr< math::Sample > columnRadiusSample_;
+
+ uint_t interval_;
+ uint_t executionCounter_;
+}; // class columnRadiusEvaluator
+
+// get height of residual liquid column, i.e., height of liquid at initial center
+template< typename FreeSurfaceBoundaryHandling_T >
+class ColumnHeightEvaluator
+{
+ public:
+ ColumnHeightEvaluator(const std::weak_ptr< const StructuredBlockForest >& blockForest,
+ const std::weak_ptr< const FreeSurfaceBoundaryHandling_T >& freeSurfaceBoundaryHandling,
+ const Vector3< uint_t >& domainSize, const Vector3< real_t >& initialOrigin, uint_t interval,
+ const std::shared_ptr< cell_idx_t >& currentColumnHeight)
+ : blockForest_(blockForest), freeSurfaceBoundaryHandling_(freeSurfaceBoundaryHandling), domainSize_(domainSize),
+ initialOrigin_(initialOrigin), currentColumnHeight_(currentColumnHeight), interval_(interval),
+ executionCounter_(uint_c(0))
+ {}
+
+ void operator()()
+ {
+ auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ auto freeSurfaceBoundaryHandling = freeSurfaceBoundaryHandling_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(freeSurfaceBoundaryHandling);
+
+ ++executionCounter_;
+
+ // only evaluate in given intervals
+ if (executionCounter_ % interval_ != uint_c(0)) { return; }
+
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ *currentColumnHeight_ = cell_idx_c(0);
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ cell_idx_t maxColumnHeight = cell_idx_c(0);
+ bool isInterfaceFound = false;
+
+ const CellInterval globalSearchInterval(cell_idx_c(initialOrigin_[0]), cell_idx_c(0),
+ cell_idx_c(initialOrigin_[2]), cell_idx_c(initialOrigin_[0]),
+ cell_idx_c(domainSize_[1]), cell_idx_c(initialOrigin_[2]));
+
+ if (blockForest->getBlockCellBB(*blockIt).overlaps(globalSearchInterval))
+ {
+ CellInterval localSearchInterval = globalSearchInterval;
+
+ // get intersection of globalSearchInterval and this block's bounding box (both in global coordinates)
+ localSearchInterval.intersect(blockForest->getBlockCellBB(*blockIt));
+
+ blockForest->transformGlobalToBlockLocalCellInterval(localSearchInterval, *blockIt);
+
+ const FlagField_T* const flagField = blockIt->template getData< const FlagField_T >(flagFieldID);
+
+ for (auto c = localSearchInterval.begin(); c != localSearchInterval.end(); ++c)
+ {
+ if (flagInfo.isInterface(flagField->get(*c)))
+ {
+ if (c->y() >= maxColumnHeight)
+ {
+ maxColumnHeight = c->y();
+ isInterfaceFound = true;
+ }
+ }
+ }
+
+ if (isInterfaceFound)
+ {
+ // transform local y-coordinate to global coordinate
+ Cell localResultCell = Cell(cell_idx_c(0), maxColumnHeight, cell_idx_c(0));
+ blockForest->transformBlockLocalToGlobalCell(localResultCell, *blockIt);
+ if (localResultCell[1] > *currentColumnHeight_) { *currentColumnHeight_ = localResultCell[1]; }
+ }
+ }
+ }
+ mpi::allReduceInplace< cell_idx_t >(*currentColumnHeight_, mpi::MAX);
+ }
+
+ private:
+ std::weak_ptr< const StructuredBlockForest > blockForest_;
+ std::weak_ptr< const FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling_;
+ Vector3< uint_t > domainSize_;
+ Vector3< real_t > initialOrigin_;
+ std::shared_ptr< cell_idx_t > currentColumnHeight_;
+
+ uint_t interval_;
+ uint_t executionCounter_;
+}; // class ColumnHeightEvaluator
+
+int main(int argc, char** argv)
+{
+ Environment walberlaEnv(argc, argv);
+
+ if (argc < 2) { WALBERLA_ABORT("Please specify a parameter file as input argument.") }
+
+ // print content of parameter file
+ WALBERLA_LOG_INFO_ON_ROOT(*walberlaEnv.config());
+
+ // get block forest parameters from parameter file
+ auto blockForestParameters = walberlaEnv.config()->getOneBlock("BlockForestParameters");
+ const Vector3< uint_t > cellsPerBlock = blockForestParameters.getParameter< Vector3< uint_t > >("cellsPerBlock");
+ const Vector3< bool > periodicity = blockForestParameters.getParameter< Vector3< bool > >("periodicity");
+ const uint_t loadBalancingFrequency = blockForestParameters.getParameter< uint_t >("loadBalancingFrequency");
+ const bool printLoadBalancingStatistics = blockForestParameters.getParameter< bool >("printLoadBalancingStatistics");
+
+ // read domain parameters from parameter file
+ auto domainParameters = walberlaEnv.config()->getOneBlock("DomainParameters");
+ const real_t columnRadius = domainParameters.getParameter< real_t >("columnRadius");
+ const real_t columnRatio = domainParameters.getParameter< real_t >("columnRatio");
+ const real_t columnHeight = columnRadius * columnRatio;
+
+ // define domain size
+ Vector3< uint_t > domainSize;
+ domainSize[0] = uint_c(real_c(12) * columnRadius);
+ domainSize[1] = uint_c(real_c(2) * columnHeight);
+ domainSize[2] = domainSize[0];
+
+ // compute number of blocks as defined by domainSize and cellsPerBlock
+ Vector3< uint_t > numBlocks;
+ numBlocks[0] = uint_c(std::ceil(real_c(domainSize[0]) / real_c(cellsPerBlock[0])));
+ numBlocks[1] = uint_c(std::ceil(real_c(domainSize[1]) / real_c(cellsPerBlock[1])));
+ numBlocks[2] = uint_c(std::ceil(real_c(domainSize[2]) / real_c(cellsPerBlock[2])));
+
+ uint_t numProcesses = uint_c(MPIManager::instance()->numProcesses());
+ WALBERLA_CHECK_LESS_EQUAL(numProcesses, numBlocks[0] * numBlocks[1] * numBlocks[2],
+ "The number of MPI processes is greater than the number of blocks as defined by "
+ "\"domainSize/cellsPerBlock\". This would result in unused MPI processes. Either decrease "
+ "the number of MPI processes or increase \"cellsPerBlock\".")
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(numProcesses);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellsPerBlock);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(domainSize);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(numBlocks);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(columnRadius);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(columnHeight);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(columnRatio);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(periodicity);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(loadBalancingFrequency);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(printLoadBalancingStatistics);
+
+ // read physics parameters from parameter file
+ auto physicsParameters = walberlaEnv.config()->getOneBlock("PhysicsParameters");
+ const uint_t timesteps = physicsParameters.getParameter< uint_t >("timesteps");
+
+ // Galilei number: Ga = density * force * L^3 / kinematicViscosity^2
+ const real_t galileiNumber = physicsParameters.getParameter< real_t >("galileiNumber");
+
+ // Bond (Eötvös) number: Bo = (density_liquid - density_gas) * force * L^2 / surfaceTension
+ const real_t bondNumber = physicsParameters.getParameter< real_t >("bondNumber");
+
+ const real_t relaxationRate = physicsParameters.getParameter< real_t >("relaxationRate");
+ const real_t viscosity = (real_c(1) / relaxationRate - real_c(0.5)) / real_c(3);
+ const real_t forceY = galileiNumber * viscosity * viscosity / real_c(std::pow(columnRadius, real_c(3)));
+ const Vector3< real_t > force(real_c(0), -forceY, real_c(0));
+ const real_t surfaceTension = std::abs(forceY) * columnRadius * columnRadius / bondNumber;
+
+ const bool enableWetting = physicsParameters.getParameter< bool >("enableWetting");
+ const real_t contactAngle = physicsParameters.getParameter< real_t >("contactAngle");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(galileiNumber);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(bondNumber);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(relaxationRate);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableWetting);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(contactAngle);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(timesteps);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(viscosity);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(force);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(surfaceTension);
+
+ // read model parameters from parameter file
+ const auto modelParameters = walberlaEnv.config()->getOneBlock("ModelParameters");
+ const std::string pdfReconstructionModel = modelParameters.getParameter< std::string >("pdfReconstructionModel");
+ const std::string pdfRefillingModel = modelParameters.getParameter< std::string >("pdfRefillingModel");
+ const std::string excessMassDistributionModel =
+ modelParameters.getParameter< std::string >("excessMassDistributionModel");
+ const std::string curvatureModel = modelParameters.getParameter< std::string >("curvatureModel");
+ const bool enableForceWeighting = modelParameters.getParameter< bool >("enableForceWeighting");
+ const bool useSimpleMassExchange = modelParameters.getParameter< bool >("useSimpleMassExchange");
+ const real_t cellConversionThreshold = modelParameters.getParameter< real_t >("cellConversionThreshold");
+ const real_t cellConversionForceThreshold = modelParameters.getParameter< real_t >("cellConversionForceThreshold");
+ const bool enableBubbleModel = modelParameters.getParameter< bool >("enableBubbleModel");
+ const bool enableBubbleSplits = modelParameters.getParameter< bool >("enableBubbleSplits");
+ const real_t smagorinskyConstant = modelParameters.getParameter< real_t >("smagorinskyConstant");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(pdfReconstructionModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(pdfRefillingModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(excessMassDistributionModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(curvatureModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableForceWeighting);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(useSimpleMassExchange);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellConversionThreshold);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellConversionForceThreshold);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableBubbleModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableBubbleSplits);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(smagorinskyConstant);
+
+ // read evaluation parameters from parameter file
+ const auto evaluationParameters = walberlaEnv.config()->getOneBlock("EvaluationParameters");
+ const uint_t performanceLogFrequency = evaluationParameters.getParameter< uint_t >("performanceLogFrequency");
+ const uint_t evaluationFrequency = evaluationParameters.getParameter< uint_t >("evaluationFrequency");
+ const std::string filename = evaluationParameters.getParameter< std::string >("filename");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(performanceLogFrequency);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(evaluationFrequency);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(filename);
+
+ // create non-uniform block forest (non-uniformity required for load balancing)
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ createNonUniformBlockForest(domainSize, cellsPerBlock, numBlocks, periodicity);
+
+ // add relaxationRate field (initialized with relaxationRate from parameter file)
+ const BlockDataID relaxationRateFieldID = field::addToStorage< ScalarField_T >(
+ blockForest, "Relaxation rate field", relaxationRate, field::fzyx, uint_c(1));
+
+ const CollisionModel_T collisionModel = lbm::collision_model::SRTField< ScalarField_T >(relaxationRateFieldID);
+
+ // add force field
+ const BlockDataID forceFieldID =
+ field::addToStorage< VectorField_T >(blockForest, "Force field", force, field::fzyx, uint_c(1));
+
+ // create lattice model
+ const LatticeModel_T latticeModel =
+ LatticeModel_T(collisionModel, lbm::force_model::GuoField< VectorField_T >(forceFieldID));
+
+ // add pdf field
+ const BlockDataID pdfFieldID = lbm::addPdfFieldToStorage(blockForest, "PDF field", latticeModel, field::fzyx);
+
+ // add fill level field (initialized with 0, i.e., gas everywhere)
+ const BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill level field", real_c(0.0), field::fzyx, uint_c(2));
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ const geometry::Cylinder cylinderColumn(
+ Vector3< real_t >(real_c(0.5) * real_c(domainSize[0]), real_c(-1), real_c(0.5) * real_c(domainSize[2])),
+ Vector3< real_t >(real_c(0.5) * real_c(domainSize[0]), columnHeight, real_c(0.5) * real_c(domainSize[2])),
+ columnRadius);
+ bubble_model::addBodyToFillLevelField< geometry::Cylinder >(*blockForest, fillFieldID, cylinderColumn, false);
+
+ // initialize boundary conditions from config file
+ const auto boundaryParameters = walberlaEnv.config()->getOneBlock("BoundaryParameters");
+ freeSurfaceBoundaryHandling->initFromConfig(boundaryParameters);
+
+ // IMPORTANT REMARK: this must be only called after every solid flag has been set; otherwise, the boundary handling
+ // might not detect solid flags correctly
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+
+ // communication after initialization
+ Communication_T communication(blockForest, flagFieldID, fillFieldID, forceFieldID);
+ communication();
+
+ PdfCommunication_T pdfCommunication(blockForest, pdfFieldID);
+ pdfCommunication();
+
+ // add bubble model
+ std::shared_ptr< bubble_model::BubbleModelBase > bubbleModel = nullptr;
+ if (enableBubbleModel)
+ {
+ const std::shared_ptr< bubble_model::BubbleModel< CommunicationStencil_T > > bubbleModelDerived =
+ std::make_shared< bubble_model::BubbleModel< CommunicationStencil_T > >(blockForest, enableBubbleSplits);
+ bubbleModelDerived->initFromFillLevelField(fillFieldID);
+ bubbleModelDerived->setAtmosphere(
+ Cell(domainSize[0] - uint_c(1), domainSize[1] - uint_c(1), domainSize[2] - uint_c(1)), real_c(1));
+
+ bubbleModel = std::static_pointer_cast< bubble_model::BubbleModelBase >(bubbleModelDerived);
+ }
+ else { bubbleModel = std::make_shared< bubble_model::BubbleModelConstantPressure >(real_c(1)); }
+
+ // initialize hydrostatic pressure
+ initHydrostaticPressure< PdfField_T >(blockForest, pdfFieldID, force, columnHeight);
+
+ // set density in non-liquid or non-interface cells to 1 (after initializing with hydrostatic pressure)
+ setDensityInNonFluidCellsToOne< FlagField_T, PdfField_T >(blockForest, flagInfo, flagFieldID, pdfFieldID);
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, timesteps);
+
+ // Laplace pressure = 2 * surface tension * curvature; curvature computation is not necessary with 0 surface tension
+ bool computeCurvature = false;
+ if (!realIsEqual(surfaceTension, real_c(0), real_c(1e-14))) { computeCurvature = true; }
+
+ // add surface geometry handler
+ const SurfaceGeometryHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > geometryHandler(
+ blockForest, freeSurfaceBoundaryHandling, fillFieldID, curvatureModel, computeCurvature, enableWetting,
+ contactAngle);
+
+ geometryHandler.addSweeps(timeloop);
+
+ const ConstBlockDataID curvatureFieldID = geometryHandler.getConstCurvatureFieldID();
+ const ConstBlockDataID normalFieldID = geometryHandler.getConstNormalFieldID();
+
+ // add boundary handling for standard boundaries and free surface boundaries
+ const SurfaceDynamicsHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > dynamicsHandler(
+ blockForest, pdfFieldID, flagFieldID, fillFieldID, forceFieldID, normalFieldID, curvatureFieldID,
+ freeSurfaceBoundaryHandling, bubbleModel, pdfReconstructionModel, pdfRefillingModel, excessMassDistributionModel,
+ relaxationRate, force, surfaceTension, enableForceWeighting, useSimpleMassExchange, cellConversionThreshold,
+ cellConversionForceThreshold, relaxationRateFieldID, smagorinskyConstant);
+
+ dynamicsHandler.addSweeps(timeloop);
+
+ // add load balancing
+ LoadBalancer< FlagField_T, CommunicationStencil_T, LatticeModelStencil_T > loadBalancer(
+ blockForest, communication, pdfCommunication, bubbleModel, uint_c(50), uint_c(10), uint_c(5),
+ loadBalancingFrequency, printLoadBalancingStatistics);
+ timeloop.addFuncAfterTimeStep(loadBalancer, "Sweep: load balancing");
+
+ // add sweep for evaluating the column height at the origin
+ const std::shared_ptr< cell_idx_t > currentColumnHeight = std::make_shared< cell_idx_t >(columnHeight);
+ const ColumnHeightEvaluator< FreeSurfaceBoundaryHandling_T > heightEvaluator(
+ blockForest, freeSurfaceBoundaryHandling, domainSize,
+ Vector3< real_t >(real_c(0.5) * real_c(domainSize[0]), real_c(0), real_c(0.5) * real_c(domainSize[2])),
+ evaluationFrequency, currentColumnHeight);
+ timeloop.addFuncAfterTimeStep(heightEvaluator, "Evaluator: column height");
+
+ // add sweep for evaluating the column width (distance of front to origin)
+ const std::shared_ptr< math::Sample > columnRadiusSample = std::make_shared< math::Sample >();
+ const columnRadiusEvaluator< FreeSurfaceBoundaryHandling_T > columnRadiusEvaluator(
+ blockForest, freeSurfaceBoundaryHandling, domainSize,
+ Vector3< real_t >(real_c(0.5) * real_c(domainSize[0]), real_c(0), real_c(0.5) * real_c(domainSize[2])),
+ evaluationFrequency, columnRadiusSample);
+ timeloop.addFuncAfterTimeStep(columnRadiusEvaluator, "Evaluator: radius");
+
+ // add VTK output
+ addVTKOutput< LatticeModel_T, FreeSurfaceBoundaryHandling_T, PdfField_T, FlagField_T, ScalarField_T, VectorField_T >(
+ blockForest, timeloop, walberlaEnv.config(), flagInfo, pdfFieldID, flagFieldID, fillFieldID, forceFieldID,
+ geometryHandler.getCurvatureFieldID(), geometryHandler.getNormalFieldID(),
+ geometryHandler.getObstNormalFieldID());
+
+ // add triangle mesh output of free surface
+ SurfaceMeshWriter< ScalarField_T, FlagField_T > surfaceMeshWriter(
+ blockForest, fillFieldID, flagFieldID, flagIDs::liquidInterfaceGasFlagIDs, real_c(0), walberlaEnv.config());
+ surfaceMeshWriter(); // write initial mesh
+ timeloop.addFuncAfterTimeStep(surfaceMeshWriter, "Writer: surface mesh");
+
+ // add logging for computational performance
+ const lbm::PerformanceLogger< FlagField_T > perfLogger(blockForest, flagFieldID, flagIDs::liquidInterfaceFlagIDs,
+ performanceLogFrequency);
+ timeloop.addFuncAfterTimeStep(perfLogger, "Evaluator: performance logging");
+
+ WcTimingPool timingPool;
+
+ for (uint_t t = uint_c(0); t != timesteps; ++t)
+ {
+ timeloop.singleStep(timingPool, true);
+
+ if (t % evaluationFrequency == uint_c(0))
+ {
+ // set initial values
+ real_t T = real_c(0);
+ real_t Z_mean = real_c(1);
+ real_t Z_max = real_c(1);
+ real_t Z_min = real_c(1);
+ real_t Z_stdDeviation = real_c(0);
+ real_t H = real_c(1);
+
+ if (!columnRadiusSample->empty())
+ {
+ // compute dimensionless quantities as defined in paper from Martin and Moyce (1952)
+ T = real_c(t) * std::sqrt(columnRatio * std::abs(force[1]) / columnRadius);
+ Z_mean = columnRadiusSample->mean() / columnRadius;
+ Z_max = columnRadiusSample->max() / columnRadius;
+ Z_min = columnRadiusSample->min() / columnRadius;
+ Z_stdDeviation = columnRadiusSample->stdDeviation() / columnRadius;
+ H = real_c(*currentColumnHeight) / columnHeight;
+ }
+
+ WALBERLA_LOG_DEVEL_ON_ROOT("time step =" << t);
+ WALBERLA_LOG_DEVEL_ON_ROOT("\t\tT = " << T << "\n\t\tZ_mean = " << Z_mean << "\n\t\tZ_max = " << Z_max
+ << "\n\t\tZ_min = " << Z_min
+ << "\n\t\tZ_stdDeviation = " << Z_stdDeviation << "\n\t\tH = " << H);
+
+ WALBERLA_ROOT_SECTION()
+ {
+ const std::vector< real_t > resultVector{ T, Z_mean, Z_max, Z_min, Z_stdDeviation, H };
+ writeNumberVector(resultVector, t, filename);
+ }
+
+ mpi::broadcastObject(Z_max, 0);
+
+ // simulation is considered converged
+ if (Z_max >= real_c(domainSize[0]) * real_c(0.5) / columnRadius - real_c(0.5))
+ {
+ WALBERLA_LOG_DEVEL_ON_ROOT("Liquid has reached domain borders.");
+ break;
+ }
+ }
+
+ if (t % performanceLogFrequency == uint_c(0) && t > uint_c(0)) { timingPool.logResultOnRoot(); }
+ }
+
+ return EXIT_SUCCESS;
+}
+} // namespace DamBreakCylindrical
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::DamBreakCylindrical::main(argc, argv); }
\ No newline at end of file
diff --git a/apps/showcases/FreeSurface/DamBreakCylindrical.prm b/apps/showcases/FreeSurface/DamBreakCylindrical.prm
new file mode 100644
index 0000000000000000000000000000000000000000..de81d688e114b52e226f3c0b42b3f599b31bf33b
--- /dev/null
+++ b/apps/showcases/FreeSurface/DamBreakCylindrical.prm
@@ -0,0 +1,111 @@
+BlockForestParameters
+{
+ cellsPerBlock < 10, 5, 10 >;
+ periodicity < 1, 0, 1 >;
+ loadBalancingFrequency 248;
+ printLoadBalancingStatistics true;
+}
+
+DomainParameters
+{
+ columnRadius 25; // initial radius of the liquid column; "a" in Martin & Moyce's paper (10.1098/rsta.1952.0006)
+ columnRatio 1; // ratio between columnHeight and columnRadius; "n^2" in Martin & Moyce's paper
+}
+
+PhysicsParameters
+{
+ galileiNumber 1831123817;
+ bondNumber 445;
+ relaxationRate 1.9995;
+ enableWetting false;
+ contactAngle 0; // only used if enableWetting=true
+ timesteps 2480;
+}
+
+ModelParameters
+{
+ pdfReconstructionModel OnlyMissing;
+ pdfRefillingModel EquilibriumRefilling;
+ excessMassDistributionModel EvenlyAllInterface;
+ curvatureModel FiniteDifferenceMethod;
+ enableForceWeighting false;
+ useSimpleMassExchange false;
+ cellConversionThreshold 1e-2;
+ cellConversionForceThreshold 1e-1;
+
+ enableBubbleModel false;
+ enableBubbleSplits false; // only used if enableBubbleModel=true
+
+ smagorinskyConstant 0.1;
+}
+
+EvaluationParameters
+{
+ performanceLogFrequency 2480;
+ evaluationFrequency 24;
+ filename rot-breaking-dam.txt;
+}
+
+BoundaryParameters
+{
+ // X
+ //Border { direction W; walldistance -1; FreeSlip{} }
+ //Border { direction E; walldistance -1; FreeSlip{} }
+
+ // Y
+ Border { direction N; walldistance -1; FreeSlip{} }
+ Border { direction S; walldistance -1; FreeSlip{} }
+
+ // Z
+ //Border { direction T; walldistance -1; FreeSlip{} }
+ //Border { direction B; walldistance -1; FreeSlip{} }
+}
+
+MeshOutputParameters
+{
+ writeFrequency 248;
+ baseFolder mesh-out;
+}
+
+VTK
+{
+ fluid_field
+ {
+ writeFrequency 248;
+ ghostLayers 0;
+ baseFolder vtk-out;
+ samplingResolution 1;
+
+ writers
+ {
+ velocity;
+ density;
+ //pdf;
+ flag;
+ fill_level;
+ force;
+ curvature;
+ normal;
+ obstacle_normal;
+ mapped_flag;
+ }
+
+ inclusion_filters
+ {
+ // only include liquid and interface cells in VTK output
+ //liquidInterfaceFilter;
+ }
+
+ before_functions
+ {
+ //ghost_layer_synchronization; // only needed if writing the ghost layer
+ }
+
+ }
+ domain_decomposition
+ {
+ writeFrequency 248;
+ baseFolder vtk-out;
+ outputDomainDecomposition true;
+ }
+}
\ No newline at end of file
diff --git a/apps/showcases/FreeSurface/DamBreakRectangular.cpp b/apps/showcases/FreeSurface/DamBreakRectangular.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..e3a4a5e4e0ac257caedac82631069b64e6142e0d
--- /dev/null
+++ b/apps/showcases/FreeSurface/DamBreakRectangular.cpp
@@ -0,0 +1,570 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file DamBreakRectangular.cpp
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//
+// This showcase simulates the collapse of a rectangular liquid column in 2D. Reference experiments are available from
+// Martin, Moyce (1952), doi:10.1098/rsta.1952.0006
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+
+#include "lbm/PerformanceLogger.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface/LoadBalancing.h"
+#include "lbm/free_surface/SurfaceMeshWriter.h"
+#include "lbm/free_surface/TotalMassComputer.h"
+#include "lbm/free_surface/VtkWriter.h"
+#include "lbm/free_surface/bubble_model/Geometry.h"
+#include "lbm/free_surface/dynamics/SurfaceDynamicsHandler.h"
+#include "lbm/free_surface/surface_geometry/SurfaceGeometryHandler.h"
+#include "lbm/free_surface/surface_geometry/Utility.h"
+#include "lbm/lattice_model/D2Q9.h"
+#include "lbm/lattice_model/D3Q19.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace DamBreakRectangular
+{
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+
+using CollisionModel_T = lbm::collision_model::SRTField< ScalarField_T >;
+using ForceModel_T = lbm::force_model::GuoField< VectorField_T >;
+using LatticeModel_T = lbm::D2Q9< CollisionModel_T, true, ForceModel_T, 2 >;
+using LatticeModelStencil_T = LatticeModel_T::Stencil;
+using PdfField_T = lbm::PdfField< LatticeModel_T >;
+using PdfCommunication_T = blockforest::SimpleCommunication< LatticeModelStencil_T >;
+
+// the geometry computations in SurfaceGeometryHandler require meaningful values in the ghost layers in corner
+// directions (flag field and fill level field); this holds, even if the lattice model uses a D3Q19 stencil
+using CommunicationStencil_T =
+ typename std::conditional< LatticeModel_T::Stencil::D == uint_t(2), stencil::D2Q9, stencil::D3Q27 >::type;
+using Communication_T = blockforest::SimpleCommunication< CommunicationStencil_T >;
+
+using flag_t = uint32_t;
+using FlagField_T = FlagField< flag_t >;
+using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+template< typename T >
+void writeNumberVector(const std::vector< T >& numberVector, const uint_t& timestep, const std::string& filename)
+{
+ std::fstream file;
+ file.open(filename, std::fstream::app);
+
+ file << timestep;
+ for (const auto number : numberVector)
+ {
+ file << "\t" << number;
+ }
+
+ file << "\n";
+ file.close();
+}
+
+// get height of residual liquid column, i.e., height of liquid at x=0
+template< typename FreeSurfaceBoundaryHandling_T >
+class ColumnHeightEvaluator
+{
+ public:
+ ColumnHeightEvaluator(const std::weak_ptr< const StructuredBlockForest >& blockForest,
+ const std::weak_ptr< const FreeSurfaceBoundaryHandling_T >& freeSurfaceBoundaryHandling,
+ const Vector3< uint_t >& domainSize, uint_t interval,
+ const std::shared_ptr< cell_idx_t >& currentColumnHeight)
+ : blockForest_(blockForest), freeSurfaceBoundaryHandling_(freeSurfaceBoundaryHandling), domainSize_(domainSize),
+ currentColumnHeight_(currentColumnHeight), interval_(interval), executionCounter_(uint_c(0))
+ {}
+
+ void operator()()
+ {
+ auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ auto freeSurfaceBoundaryHandling = freeSurfaceBoundaryHandling_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(freeSurfaceBoundaryHandling);
+
+ ++executionCounter_;
+
+ // only evaluate in given intervals
+ if (executionCounter_ % interval_ != uint_c(0)) { return; }
+
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ *currentColumnHeight_ = cell_idx_c(0);
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ cell_idx_t maxColumnHeight = cell_idx_c(0);
+ bool isInterfaceFound = false;
+
+ const CellInterval globalSearchInterval(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0), cell_idx_c(0),
+ cell_idx_c(domainSize_[1]), cell_idx_c(0));
+
+ if (blockForest->getBlockCellBB(*blockIt).overlaps(globalSearchInterval))
+ {
+ CellInterval localSearchInterval = globalSearchInterval;
+
+ // get intersection of globalSearchInterval and this block's bounding box (both in global coordinates)
+ localSearchInterval.intersect(blockForest->getBlockCellBB(*blockIt));
+
+ blockForest->transformGlobalToBlockLocalCellInterval(localSearchInterval, *blockIt);
+
+ const FlagField_T* const flagField = blockIt->template getData< const FlagField_T >(flagFieldID);
+
+ for (auto c = localSearchInterval.begin(); c != localSearchInterval.end(); ++c)
+ {
+ if (flagInfo.isInterface(flagField->get(*c)))
+ {
+ if (c->y() >= maxColumnHeight)
+ {
+ maxColumnHeight = c->y();
+ isInterfaceFound = true;
+ }
+ }
+ }
+
+ if (isInterfaceFound)
+ {
+ // transform local y-coordinate to global coordinate
+ Cell localResultCell = Cell(cell_idx_c(0), maxColumnHeight, cell_idx_c(0));
+ blockForest->transformBlockLocalToGlobalCell(localResultCell, *blockIt);
+ if (localResultCell[1] > *currentColumnHeight_) { *currentColumnHeight_ = localResultCell[1]; }
+ }
+ }
+ }
+ mpi::allReduceInplace< cell_idx_t >(*currentColumnHeight_, mpi::MAX);
+ }
+
+ private:
+ std::weak_ptr< const StructuredBlockForest > blockForest_;
+ std::weak_ptr< const FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling_;
+ Vector3< uint_t > domainSize_;
+ std::shared_ptr< cell_idx_t > currentColumnHeight_;
+
+ uint_t interval_;
+ uint_t executionCounter_;
+}; // class ColumnHeightEvaluator
+
+// get width of liquid column (distance of wave front to origin, at bottom of the domain)
+template< typename FreeSurfaceBoundaryHandling_T >
+class ColumnWidthEvaluator
+{
+ public:
+ ColumnWidthEvaluator(const std::weak_ptr< const StructuredBlockForest >& blockForest,
+ const std::weak_ptr< const FreeSurfaceBoundaryHandling_T >& freeSurfaceBoundaryHandling,
+ const Vector3< uint_t >& domainSize, uint_t interval,
+ const std::shared_ptr< cell_idx_t >& currentColumnWidth)
+ : blockForest_(blockForest), freeSurfaceBoundaryHandling_(freeSurfaceBoundaryHandling), domainSize_(domainSize),
+ currentColumnWidth_(currentColumnWidth), interval_(interval), executionCounter_(uint_c(0))
+ {}
+
+ void operator()()
+ {
+ auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ auto freeSurfaceBoundaryHandling = freeSurfaceBoundaryHandling_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(freeSurfaceBoundaryHandling);
+
+ ++executionCounter_;
+
+ // only evaluate in given intervals
+ if (executionCounter_ % interval_ != uint_c(0)) { return; }
+
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ *currentColumnWidth_ = cell_idx_c(0);
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ cell_idx_t maxColumnWidth = cell_idx_c(0);
+ bool isInterfaceFound = false;
+
+ // only search in an interval with a height of 10 cells to avoid detecting droplets
+ const CellInterval globalSearchInterval(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0),
+ cell_idx_c(domainSize_[0]), cell_idx_c(0), cell_idx_c(0));
+
+ if (blockForest->getBlockCellBB(*blockIt).overlaps(globalSearchInterval))
+ {
+ CellInterval localSearchInterval = globalSearchInterval;
+
+ // get intersection of globalSearchInterval and this block's bounding box (both in global coordinates)
+ localSearchInterval.intersect(blockForest->getBlockCellBB(*blockIt));
+
+ blockForest->transformGlobalToBlockLocalCellInterval(localSearchInterval, *blockIt);
+
+ const FlagField_T* const flagField = blockIt->template getData< const FlagField_T >(flagFieldID);
+
+ for (auto c = localSearchInterval.begin(); c != localSearchInterval.end(); ++c)
+ {
+ if (flagInfo.isInterface(flagField->get(*c)))
+ {
+ if (c->x() >= maxColumnWidth)
+ {
+ maxColumnWidth = c->x();
+ isInterfaceFound = true;
+ }
+ }
+ }
+
+ if (isInterfaceFound)
+ {
+ // transform local x-coordinate to global coordinate
+ Cell localResultCell = Cell(maxColumnWidth, cell_idx_c(0), cell_idx_c(0));
+ blockForest->transformBlockLocalToGlobalCell(localResultCell, *blockIt);
+ if (localResultCell[0] > *currentColumnWidth_) { *currentColumnWidth_ = localResultCell[0]; }
+ }
+ }
+ }
+ mpi::allReduceInplace< cell_idx_t >(*currentColumnWidth_, mpi::MAX);
+ }
+
+ private:
+ std::weak_ptr< const StructuredBlockForest > blockForest_;
+ std::weak_ptr< const FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling_;
+ Vector3< uint_t > domainSize_;
+ std::shared_ptr< cell_idx_t > currentColumnWidth_;
+
+ uint_t interval_;
+ uint_t executionCounter_;
+}; // class ColumnWidthEvaluator
+
+int main(int argc, char** argv)
+{
+ Environment walberlaEnv(argc, argv);
+
+ if (argc < 2) { WALBERLA_ABORT("Please specify a parameter file as input argument.") }
+
+ // print content of parameter file
+ WALBERLA_LOG_INFO_ON_ROOT(*walberlaEnv.config());
+
+ // get block forest parameters from parameter file
+ auto blockForestParameters = walberlaEnv.config()->getOneBlock("BlockForestParameters");
+ const Vector3< uint_t > cellsPerBlock = blockForestParameters.getParameter< Vector3< uint_t > >("cellsPerBlock");
+ const Vector3< bool > periodicity = blockForestParameters.getParameter< Vector3< bool > >("periodicity");
+ const uint_t loadBalancingFrequency = blockForestParameters.getParameter< uint_t >("loadBalancingFrequency");
+ const bool printLoadBalancingStatistics = blockForestParameters.getParameter< bool >("printLoadBalancingStatistics");
+
+ // read domain parameters from parameter file
+ auto domainParameters = walberlaEnv.config()->getOneBlock("DomainParameters");
+ const real_t columnWidth = domainParameters.getParameter< real_t >("columnWidth");
+ const real_t columnRatio = domainParameters.getParameter< real_t >("columnRatio");
+ const real_t columnHeight = columnWidth * columnRatio;
+
+ // define domain size
+ Vector3< uint_t > domainSize;
+ domainSize[0] = uint_c(real_c(15) * columnWidth);
+ domainSize[1] = uint_c(real_c(2) * columnHeight);
+ domainSize[2] = uint_c(1);
+
+ // compute number of blocks as defined by domainSize and cellsPerBlock
+ Vector3< uint_t > numBlocks;
+ numBlocks[0] = uint_c(std::ceil(real_c(domainSize[0]) / real_c(cellsPerBlock[0])));
+ numBlocks[1] = uint_c(std::ceil(real_c(domainSize[1]) / real_c(cellsPerBlock[1])));
+ numBlocks[2] = uint_c(std::ceil(real_c(domainSize[2]) / real_c(cellsPerBlock[2])));
+
+ // get number of (MPI) processes
+ uint_t numProcesses = uint_c(MPIManager::instance()->numProcesses());
+ WALBERLA_CHECK_LESS_EQUAL(numProcesses, numBlocks[0] * numBlocks[1] * numBlocks[2],
+ "The number of MPI processes is greater than the number of blocks as defined by "
+ "\"domainSize/cellsPerBlock\". This would result in unused MPI processes. Either decrease "
+ "the number of MPI processes or increase \"cellsPerBlock\".")
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(numProcesses);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellsPerBlock);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(domainSize);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(numBlocks);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(columnWidth);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(columnHeight);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(columnRatio);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(periodicity);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(loadBalancingFrequency);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(printLoadBalancingStatistics);
+
+ // read physics parameters from parameter file
+ auto physicsParameters = walberlaEnv.config()->getOneBlock("PhysicsParameters");
+ const uint_t timesteps = physicsParameters.getParameter< uint_t >("timesteps");
+
+ // Galilei number: Ga = density * force * L^3 / kinematicViscosity^2
+ const real_t galileiNumber = physicsParameters.getParameter< real_t >("galileiNumber");
+
+ // Bond (Eötvös) number: Bo = (density_liquid - density_gas) * force * L^2 / surfaceTension
+ const real_t bondNumber = physicsParameters.getParameter< real_t >("bondNumber");
+
+ const real_t relaxationRate = physicsParameters.getParameter< real_t >("relaxationRate");
+ const real_t viscosity = (real_c(1) / relaxationRate - real_c(0.5)) / real_c(3);
+ const real_t forceY = galileiNumber * viscosity * viscosity / real_c(std::pow(columnWidth, real_c(3)));
+ const Vector3< real_t > force(real_c(0), -forceY, real_c(0));
+ const real_t surfaceTension = std::abs(forceY) * columnWidth * columnWidth / bondNumber;
+
+ const bool enableWetting = physicsParameters.getParameter< bool >("enableWetting");
+ const real_t contactAngle = physicsParameters.getParameter< real_t >("contactAngle");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(galileiNumber);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(bondNumber);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(relaxationRate);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableWetting);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(contactAngle);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(timesteps);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(viscosity);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(force);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(surfaceTension);
+
+ // read model parameters from parameter file
+ const auto modelParameters = walberlaEnv.config()->getOneBlock("ModelParameters");
+ const std::string pdfReconstructionModel = modelParameters.getParameter< std::string >("pdfReconstructionModel");
+ const std::string pdfRefillingModel = modelParameters.getParameter< std::string >("pdfRefillingModel");
+ const std::string excessMassDistributionModel =
+ modelParameters.getParameter< std::string >("excessMassDistributionModel");
+ const std::string curvatureModel = modelParameters.getParameter< std::string >("curvatureModel");
+ const bool enableForceWeighting = modelParameters.getParameter< bool >("enableForceWeighting");
+ const bool useSimpleMassExchange = modelParameters.getParameter< bool >("useSimpleMassExchange");
+ const real_t cellConversionThreshold = modelParameters.getParameter< real_t >("cellConversionThreshold");
+ const real_t cellConversionForceThreshold = modelParameters.getParameter< real_t >("cellConversionForceThreshold");
+ const bool enableBubbleModel = modelParameters.getParameter< bool >("enableBubbleModel");
+ const bool enableBubbleSplits = modelParameters.getParameter< bool >("enableBubbleSplits");
+ const real_t smagorinskyConstant = modelParameters.getParameter< real_t >("smagorinskyConstant");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(pdfReconstructionModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(pdfRefillingModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(excessMassDistributionModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(curvatureModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableForceWeighting);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(useSimpleMassExchange);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellConversionThreshold);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellConversionForceThreshold);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableBubbleModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableBubbleSplits);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(smagorinskyConstant);
+
+ // read evaluation parameters from parameter file
+ const auto evaluationParameters = walberlaEnv.config()->getOneBlock("EvaluationParameters");
+ const uint_t performanceLogFrequency = evaluationParameters.getParameter< uint_t >("performanceLogFrequency");
+ const uint_t evaluationFrequency = evaluationParameters.getParameter< uint_t >("evaluationFrequency");
+ const std::string filename = evaluationParameters.getParameter< std::string >("filename");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(performanceLogFrequency);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(evaluationFrequency);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(filename);
+
+ // create non-uniform block forest (non-uniformity required for load balancing)
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ createNonUniformBlockForest(domainSize, cellsPerBlock, numBlocks, periodicity);
+
+ // add relaxationRate field (initialized with relaxationRate from parameter file)
+ const BlockDataID relaxationRateFieldID = field::addToStorage< ScalarField_T >(
+ blockForest, "Relaxation rate field", relaxationRate, field::fzyx, uint_c(1));
+
+ const CollisionModel_T collisionModel = lbm::collision_model::SRTField< ScalarField_T >(relaxationRateFieldID);
+
+ // add force field
+ const BlockDataID forceFieldID =
+ field::addToStorage< VectorField_T >(blockForest, "Force field", force, field::fzyx, uint_c(1));
+
+ // create lattice model
+ const LatticeModel_T latticeModel = LatticeModel_T(collisionModel, ForceModel_T(forceFieldID));
+
+ // add pdf field
+ const BlockDataID pdfFieldID = lbm::addPdfFieldToStorage(blockForest, "PDF field", latticeModel, field::fzyx);
+
+ // add fill level field (initialized with 0, i.e., gas everywhere)
+ const BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill level field", real_c(0.0), field::fzyx, uint_c(2));
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ // initialize rectangular column of liquid
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ ScalarField_T* const fillField = blockIt->getData< ScalarField_T >(fillFieldID);
+
+ // cell of the liquid column's outermost corner in block-local coordinates
+ Cell localColumnCornerCell =
+ Cell(cell_idx_c(std::floor(columnWidth)), cell_idx_c(std::floor(columnHeight)), cell_idx_c(0));
+
+ blockForest->transformGlobalToBlockLocalCell(localColumnCornerCell, *blockIt);
+
+ WALBERLA_FOR_ALL_CELLS(fillFieldIt, fillField, {
+ // liquid cells
+ if (fillFieldIt.x() < localColumnCornerCell[0] && fillFieldIt.y() < localColumnCornerCell[1])
+ {
+ *fillFieldIt = real_c(1);
+ }
+
+ // interface cells at side
+ if (fillFieldIt.x() == localColumnCornerCell[0] && fillFieldIt.y() < localColumnCornerCell[1])
+ {
+ *fillFieldIt = columnWidth - std::floor(columnWidth);
+ }
+
+ // interface cells at top
+ if (fillFieldIt.y() == localColumnCornerCell[1] && fillFieldIt.x() < localColumnCornerCell[0])
+ {
+ *fillFieldIt = columnHeight - std::floor(columnHeight);
+ }
+
+ // interface cell in corner
+ if (fillFieldIt.x() == localColumnCornerCell[0] && fillFieldIt.y() == localColumnCornerCell[1])
+ {
+ *fillFieldIt =
+ real_c(0.5) * ((columnWidth - std::floor(columnWidth)) + (columnHeight - std::floor(columnHeight)));
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ // initialize boundary conditions from config file
+ const auto boundaryParameters = walberlaEnv.config()->getOneBlock("BoundaryParameters");
+ freeSurfaceBoundaryHandling->initFromConfig(boundaryParameters);
+
+ // IMPORTANT REMARK: this must be only called after every solid flag has been set; otherwise, the boundary handling
+ // might not detect solid flags correctly
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+
+ // communication after initialization
+ Communication_T communication(blockForest, flagFieldID, fillFieldID, forceFieldID);
+ communication();
+
+ PdfCommunication_T pdfCommunication(blockForest, pdfFieldID);
+ pdfCommunication();
+
+ // add bubble model
+ std::shared_ptr< bubble_model::BubbleModelBase > bubbleModel = nullptr;
+ if (enableBubbleModel)
+ {
+ const std::shared_ptr< bubble_model::BubbleModel< CommunicationStencil_T > > bubbleModelDerived =
+ std::make_shared< bubble_model::BubbleModel< CommunicationStencil_T > >(blockForest, enableBubbleSplits);
+ bubbleModelDerived->initFromFillLevelField(fillFieldID);
+ bubbleModelDerived->setAtmosphere(Cell(domainSize[0] - uint_c(1), domainSize[1] - uint_c(1), uint_c(0)),
+ real_c(1));
+
+ bubbleModel = std::static_pointer_cast< bubble_model::BubbleModelBase >(bubbleModelDerived);
+ }
+ else { bubbleModel = std::make_shared< bubble_model::BubbleModelConstantPressure >(real_c(1)); }
+
+ // initialize hydrostatic pressure
+ initHydrostaticPressure< PdfField_T >(blockForest, pdfFieldID, force, columnHeight);
+
+ // set density in non-liquid or non-interface cells to 1 (after initializing with hydrostatic pressure)
+ setDensityInNonFluidCellsToOne< FlagField_T, PdfField_T >(blockForest, flagInfo, flagFieldID, pdfFieldID);
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, timesteps);
+
+ // Laplace pressure = 2 * surface tension * curvature; curvature computation is not necessary with 0 surface tension
+ bool computeCurvature = false;
+ if (!realIsEqual(surfaceTension, real_c(0), real_c(1e-14))) { computeCurvature = true; }
+
+ // add surface geometry handler
+ const SurfaceGeometryHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > geometryHandler(
+ blockForest, freeSurfaceBoundaryHandling, fillFieldID, curvatureModel, computeCurvature, enableWetting,
+ contactAngle);
+
+ geometryHandler.addSweeps(timeloop);
+
+ const ConstBlockDataID curvatureFieldID = geometryHandler.getConstCurvatureFieldID();
+ const ConstBlockDataID normalFieldID = geometryHandler.getConstNormalFieldID();
+
+ // add boundary handling for standard boundaries and free surface boundaries
+ const SurfaceDynamicsHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > dynamicsHandler(
+ blockForest, pdfFieldID, flagFieldID, fillFieldID, forceFieldID, normalFieldID, curvatureFieldID,
+ freeSurfaceBoundaryHandling, bubbleModel, pdfReconstructionModel, pdfRefillingModel, excessMassDistributionModel,
+ relaxationRate, force, surfaceTension, enableForceWeighting, useSimpleMassExchange, cellConversionThreshold,
+ cellConversionForceThreshold, relaxationRateFieldID, smagorinskyConstant);
+
+ dynamicsHandler.addSweeps(timeloop);
+
+ // add load balancing
+ const LoadBalancer< FlagField_T, CommunicationStencil_T, LatticeModelStencil_T > loadBalancer(
+ blockForest, communication, pdfCommunication, bubbleModel, uint_c(50), uint_c(10), uint_c(5),
+ loadBalancingFrequency, printLoadBalancingStatistics);
+ timeloop.addFuncAfterTimeStep(loadBalancer, "Sweep: load balancing");
+
+ // add sweep for evaluating the column height at the origin
+ const std::shared_ptr< cell_idx_t > currentColumnHeight = std::make_shared< cell_idx_t >(columnHeight);
+ const ColumnHeightEvaluator< FreeSurfaceBoundaryHandling_T > heightEvaluator(
+ blockForest, freeSurfaceBoundaryHandling, domainSize, evaluationFrequency, currentColumnHeight);
+ timeloop.addFuncAfterTimeStep(heightEvaluator, "Evaluator: column height");
+
+ // add sweep for evaluating the column width (distance of front to origin)
+ const std::shared_ptr< cell_idx_t > currentColumnWidth = std::make_shared< cell_idx_t >(columnWidth);
+ const ColumnWidthEvaluator< FreeSurfaceBoundaryHandling_T > widthEvaluator(
+ blockForest, freeSurfaceBoundaryHandling, domainSize, evaluationFrequency, currentColumnWidth);
+ timeloop.addFuncAfterTimeStep(widthEvaluator, "Evaluator: column width");
+
+ // add VTK output
+ addVTKOutput< LatticeModel_T, FreeSurfaceBoundaryHandling_T, PdfField_T, FlagField_T, ScalarField_T, VectorField_T >(
+ blockForest, timeloop, walberlaEnv.config(), flagInfo, pdfFieldID, flagFieldID, fillFieldID, forceFieldID,
+ geometryHandler.getCurvatureFieldID(), geometryHandler.getNormalFieldID(),
+ geometryHandler.getObstNormalFieldID());
+
+ // add triangle mesh output of free surface
+ SurfaceMeshWriter< ScalarField_T, FlagField_T > surfaceMeshWriter(
+ blockForest, fillFieldID, flagFieldID, flagIDs::liquidInterfaceGasFlagIDs, real_c(0), walberlaEnv.config());
+ surfaceMeshWriter(); // write initial mesh
+ timeloop.addFuncAfterTimeStep(surfaceMeshWriter, "Writer: surface mesh");
+
+ // add logging for computational performance
+ const lbm::PerformanceLogger< FlagField_T > perfLogger(blockForest, flagFieldID, flagIDs::liquidInterfaceFlagIDs,
+ performanceLogFrequency);
+ timeloop.addFuncAfterTimeStep(perfLogger, "Evaluator: performance logging");
+
+ WcTimingPool timingPool;
+
+ for (uint_t t = uint_c(0); t != timesteps; ++t)
+ {
+ timeloop.singleStep(timingPool, true);
+
+ if (t % evaluationFrequency == uint_c(0))
+ {
+ // compute dimensionless quantities as defined in paper from Martin and Moyce (1952)
+ const real_t T = real_c(t) * std::sqrt(columnRatio * std::abs(force[1]) / columnWidth);
+ const real_t Z = real_c(*currentColumnWidth) / columnWidth;
+ const real_t H = real_c(*currentColumnHeight) / columnHeight;
+ const std::vector< real_t > resultVector{ T, Z, H };
+
+ WALBERLA_LOG_DEVEL_ON_ROOT("time step =" << t);
+ WALBERLA_LOG_DEVEL_ON_ROOT("\t\tT = " << T << "\n\t\tZ = " << Z << "\n\t\tH = " << H);
+ WALBERLA_ROOT_SECTION() { writeNumberVector(resultVector, t, filename); }
+
+ // simulation is considered converged
+ if (Z >= real_c(domainSize[0]) / columnWidth - real_c(0.5))
+ {
+ WALBERLA_LOG_DEVEL_ON_ROOT("Liquid has reached opposite wall.");
+ break;
+ }
+ }
+
+ if (t % performanceLogFrequency == uint_c(0) && t > uint_c(0)) { timingPool.logResultOnRoot(); }
+ }
+
+ return EXIT_SUCCESS;
+}
+
+} // namespace DamBreakRectangular
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::DamBreakRectangular::main(argc, argv); }
\ No newline at end of file
diff --git a/apps/showcases/FreeSurface/DamBreakRectangular.prm b/apps/showcases/FreeSurface/DamBreakRectangular.prm
new file mode 100644
index 0000000000000000000000000000000000000000..34fdca4b018ce9af4e4f80cf285ee545845246d2
--- /dev/null
+++ b/apps/showcases/FreeSurface/DamBreakRectangular.prm
@@ -0,0 +1,111 @@
+BlockForestParameters
+{
+ cellsPerBlock < 50, 50, 1 >;
+ periodicity < 0, 0, 1 >;
+ loadBalancingFrequency 991;
+ printLoadBalancingStatistics true;
+}
+
+DomainParameters
+{
+ columnWidth 50; // initial width of the liquid column; "a" in Martin & Moyce's paper (10.1098/rsta.1952.0006)
+ columnRatio 2; // ratio between columnHeight and columnWidth; "n^2" in Martin & Moyce's paper
+}
+
+PhysicsParameters
+{
+ galileiNumber 1831123817;
+ bondNumber 445;
+ relaxationRate 1.9995;
+ enableWetting false;
+ contactAngle 0; // only used if enableWetting=true
+ timesteps 9910;
+}
+
+ModelParameters
+{
+ pdfReconstructionModel OnlyMissing;
+ pdfRefillingModel EquilibriumRefilling;
+ excessMassDistributionModel EvenlyAllInterface;
+ curvatureModel FiniteDifferenceMethod;
+ enableForceWeighting false;
+ useSimpleMassExchange false;
+ cellConversionThreshold 1e-2;
+ cellConversionForceThreshold 1e-1;
+
+ enableBubbleModel false;
+ enableBubbleSplits false; // only used if enableBubbleModel=true
+
+ smagorinskyConstant 0.1;
+}
+
+EvaluationParameters
+{
+ performanceLogFrequency 25000;
+ evaluationFrequency 99;
+ filename breaking-dam.txt;
+}
+
+BoundaryParameters
+{
+ // X
+ Border { direction W; walldistance -1; FreeSlip{} }
+ Border { direction E; walldistance -1; FreeSlip{} }
+
+ // Y
+ Border { direction N; walldistance -1; FreeSlip{} }
+ Border { direction S; walldistance -1; FreeSlip{} }
+
+ // Z
+ //Border { direction T; walldistance -1; FreeSlip{} }
+ //Border { direction B; walldistance -1; FreeSlip{} }
+}
+
+MeshOutputParameters
+{
+ writeFrequency 0;
+ baseFolder mesh-out;
+}
+
+VTK
+{
+ fluid_field
+ {
+ writeFrequency 991;
+ ghostLayers 0;
+ baseFolder vtk-out;
+ samplingResolution 1;
+
+ writers
+ {
+ velocity;
+ density;
+ //pdf;
+ flag;
+ fill_level;
+ force;
+ curvature;
+ normal;
+ obstacle_normal;
+ mapped_flag;
+ }
+
+ inclusion_filters
+ {
+ // only include liquid and interface cells in VTK output
+ //liquidInterfaceFilter;
+ }
+
+ before_functions
+ {
+ //ghost_layer_synchronization; // only needed if writing the ghost layer
+ }
+
+ }
+ domain_decomposition
+ {
+ writeFrequency 991;
+ baseFolder vtk-out;
+ outputDomainDecomposition true;
+ }
+}
\ No newline at end of file
diff --git a/apps/showcases/FreeSurface/DropImpact.cpp b/apps/showcases/FreeSurface/DropImpact.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..143885a05538da4452ff2cff491e9a010fc39de2
--- /dev/null
+++ b/apps/showcases/FreeSurface/DropImpact.cpp
@@ -0,0 +1,367 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file DropImpact.cpp
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//
+// This showcase simulates the impact of a droplet into a pool of liquid. Reference experiments are available from
+// - Wang, Chen (2000), doi:10.1063/1.1287511 (vertical impact)
+// - Reijers, Liu, Lohse, Gelderblom (2019), url: http://arxiv.org/abs/1903.08978 (oblique impact)
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+
+#include "lbm/PerformanceLogger.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface/LoadBalancing.h"
+#include "lbm/free_surface/SurfaceMeshWriter.h"
+#include "lbm/free_surface/VtkWriter.h"
+#include "lbm/free_surface/bubble_model/Geometry.h"
+#include "lbm/free_surface/dynamics/SurfaceDynamicsHandler.h"
+#include "lbm/free_surface/surface_geometry/SurfaceGeometryHandler.h"
+#include "lbm/free_surface/surface_geometry/Utility.h"
+#include "lbm/lattice_model/D3Q19.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace DropImpact
+{
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+
+using CollisionModel_T = lbm::collision_model::SRT;
+using ForceModel_T = lbm::force_model::GuoField< VectorField_T >;
+using LatticeModel_T = lbm::D3Q19< CollisionModel_T, true, ForceModel_T, 2 >;
+using LatticeModelStencil_T = LatticeModel_T::Stencil;
+using PdfField_T = lbm::PdfField< LatticeModel_T >;
+using PdfCommunication_T = blockforest::SimpleCommunication< LatticeModelStencil_T >;
+
+// the geometry computations in SurfaceGeometryHandler require meaningful values in the ghost layers in corner
+// directions (flag field and fill level field); this holds, even if the lattice model uses a D3Q19 stencil
+using CommunicationStencil_T =
+ typename std::conditional< LatticeModel_T::Stencil::D == uint_t(2), stencil::D2Q9, stencil::D3Q27 >::type;
+using Communication_T = blockforest::SimpleCommunication< CommunicationStencil_T >;
+
+using flag_t = uint32_t;
+using FlagField_T = FlagField< flag_t >;
+using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+int main(int argc, char** argv)
+{
+ Environment walberlaEnv(argc, argv);
+
+ if (argc < 2) { WALBERLA_ABORT("Please specify a parameter file as input argument.") }
+
+ // print content of parameter file
+ WALBERLA_LOG_INFO_ON_ROOT(*walberlaEnv.config());
+
+ // get block forest parameters from parameter file
+ auto blockForestParameters = walberlaEnv.config()->getOneBlock("BlockForestParameters");
+ const Vector3< uint_t > cellsPerBlock = blockForestParameters.getParameter< Vector3< uint_t > >("cellsPerBlock");
+ const Vector3< bool > periodicity = blockForestParameters.getParameter< Vector3< bool > >("periodicity");
+ const uint_t loadBalancingFrequency = blockForestParameters.getParameter< uint_t >("loadBalancingFrequency");
+ const bool printLoadBalancingStatistics = blockForestParameters.getParameter< bool >("printLoadBalancingStatistics");
+
+ // read domain parameters from parameter file
+ const auto domainParameters = walberlaEnv.config()->getOneBlock("DomainParameters");
+ const real_t dropDiameter = domainParameters.getParameter< real_t >("dropDiameter");
+ const Vector3< real_t > dropCenterFactor = domainParameters.getParameter< Vector3< real_t > >("dropCenterFactor");
+ const real_t poolHeightFactor = domainParameters.getParameter< real_t >("poolHeightFactor");
+ const Vector3< real_t > domainSizeFactor = domainParameters.getParameter< Vector3< real_t > >("domainSizeFactor");
+
+ // define domain size
+ Vector3< uint_t > domainSize = domainSizeFactor * dropDiameter;
+ domainSize[0] = uint_c(domainSizeFactor[0] * dropDiameter);
+ domainSize[1] = uint_c(domainSizeFactor[1] * dropDiameter);
+ domainSize[2] = uint_c(domainSizeFactor[2] * dropDiameter);
+
+ // compute number of blocks as defined by domainSize and cellsPerBlock
+ Vector3< uint_t > numBlocks;
+ numBlocks[0] = uint_c(std::ceil(real_c(domainSize[0]) / real_c(cellsPerBlock[0])));
+ numBlocks[1] = uint_c(std::ceil(real_c(domainSize[1]) / real_c(cellsPerBlock[1])));
+ numBlocks[2] = uint_c(std::ceil(real_c(domainSize[2]) / real_c(cellsPerBlock[2])));
+
+ // get number of (MPI) processes
+ uint_t numProcesses = uint_c(MPIManager::instance()->numProcesses());
+ WALBERLA_CHECK_LESS_EQUAL(numProcesses, numBlocks[0] * numBlocks[1] * numBlocks[2],
+ "The number of MPI processes is greater than the number of blocks as defined by "
+ "\"domainSize/cellsPerBlock\". This would result in unused MPI processes. Either decrease "
+ "the number of MPI processes or increase \"cellsPerBlock\".")
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(numProcesses);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellsPerBlock);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(numBlocks);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(dropDiameter);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(dropCenterFactor);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(poolHeightFactor);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(domainSizeFactor);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(periodicity);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(domainSize);
+
+ Vector3< uint_t > realDomainSize;
+ realDomainSize[0] = cellsPerBlock[0] * numBlocks[0];
+ realDomainSize[1] = cellsPerBlock[1] * numBlocks[1];
+ realDomainSize[2] = cellsPerBlock[2] * numBlocks[2];
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(realDomainSize);
+
+ if (domainSize[0] != realDomainSize[0] && periodicity[0])
+ {
+ WALBERLA_ABORT(
+ "The specified domain size in x-direction can not be obtained with the number of blocks you specified.")
+ }
+ if (domainSize[1] != realDomainSize[1] && periodicity[1])
+ {
+ WALBERLA_ABORT(
+ "The specified domain size in y-direction can not be obtained with the number of blocks you specified.")
+ }
+ // the z-direction must be no slip in this setup and is simply extended (see below) to obtain the specified size
+ int boundaryThicknessZ = int_c(realDomainSize[2]) - int_c(domainSize[2]);
+ if (boundaryThicknessZ < 0)
+ {
+ WALBERLA_ABORT("Something went wrong: the resulting domain size in z-direction is less than specified.")
+ }
+
+ // read physics parameters from parameter file
+ const auto physicsParameters = walberlaEnv.config()->getOneBlock("PhysicsParameters");
+ const real_t bondNumber = physicsParameters.getParameter< real_t >("bondNumber");
+ const real_t weberNumber = physicsParameters.getParameter< real_t >("weberNumber");
+ const real_t ohnesorgeNumber = physicsParameters.getParameter< real_t >("ohnesorgeNumber");
+ const real_t relaxationRate = physicsParameters.getParameter< real_t >("relaxationRate");
+ const real_t impactAngleDegree = physicsParameters.getParameter< real_t >("impactAngleDegree");
+
+ const CollisionModel_T collisionModel = CollisionModel_T(relaxationRate);
+ const real_t viscosity = collisionModel.viscosity();
+
+ const real_t surfaceTension = real_c(std::pow(viscosity / ohnesorgeNumber, 2)) / dropDiameter;
+ const real_t gravitationalAccelerationZ = bondNumber * surfaceTension / (dropDiameter * dropDiameter);
+ const real_t impactVelocityMagnitude = real_c(std::pow(weberNumber * surfaceTension / dropDiameter, 0.5));
+
+ const Vector3< real_t > force(real_c(0), real_c(0), -gravitationalAccelerationZ);
+
+ const real_t impactVelocityY =
+ impactVelocityMagnitude * real_c(std::sin(impactAngleDegree * math::pi / real_c(180)));
+ const real_t impactVelocityZ =
+ impactVelocityMagnitude * real_c(std::cos(impactAngleDegree * math::pi / real_c(180)));
+
+ const Vector3< real_t > impactVelocity(real_c(0), impactVelocityY, -impactVelocityZ);
+
+ const bool enableWetting = physicsParameters.getParameter< bool >("enableWetting");
+ const real_t contactAngle = physicsParameters.getParameter< real_t >("contactAngle");
+
+ const uint_t timesteps = physicsParameters.getParameter< uint_t >("timesteps");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(relaxationRate);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(surfaceTension);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(force);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(impactVelocity);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableWetting);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(contactAngle);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(timesteps);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(viscosity);
+
+ // read model parameters from parameter file
+ const auto modelParameters = walberlaEnv.config()->getOneBlock("ModelParameters");
+ const std::string pdfReconstructionModel = modelParameters.getParameter< std::string >("pdfReconstructionModel");
+ const std::string pdfRefillingModel = modelParameters.getParameter< std::string >("pdfRefillingModel");
+ const std::string excessMassDistributionModel =
+ modelParameters.getParameter< std::string >("excessMassDistributionModel");
+ const std::string curvatureModel = modelParameters.getParameter< std::string >("curvatureModel");
+ const bool enableForceWeighting = modelParameters.getParameter< bool >("enableForceWeighting");
+ const bool useSimpleMassExchange = modelParameters.getParameter< bool >("useSimpleMassExchange");
+ const bool enableBubbleModel = modelParameters.getParameter< bool >("enableBubbleModel");
+ const bool enableBubbleSplits = modelParameters.getParameter< bool >("enableBubbleSplits");
+ const real_t cellConversionThreshold = modelParameters.getParameter< real_t >("cellConversionThreshold");
+ const real_t cellConversionForceThreshold = modelParameters.getParameter< real_t >("cellConversionForceThreshold");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(pdfReconstructionModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(pdfRefillingModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(excessMassDistributionModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(curvatureModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableForceWeighting);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(useSimpleMassExchange);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableBubbleModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableBubbleSplits);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellConversionThreshold);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellConversionForceThreshold);
+
+ // read evaluation parameters from parameter file
+ const auto evaluationParameters = walberlaEnv.config()->getOneBlock("EvaluationParameters");
+ const uint_t performanceLogFrequency = evaluationParameters.getParameter< uint_t >("performanceLogFrequency");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(performanceLogFrequency);
+
+ // create non-uniform block forest (non-uniformity required for load balancing)
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ createNonUniformBlockForest(domainSize, cellsPerBlock, numBlocks, periodicity);
+
+ // add force field
+ const BlockDataID forceFieldID =
+ field::addToStorage< VectorField_T >(blockForest, "Force field", force, field::fzyx, uint_c(1));
+
+ // create lattice model
+ const LatticeModel_T latticeModel = LatticeModel_T(collisionModel, ForceModel_T(forceFieldID));
+
+ // add pdf field
+ const BlockDataID pdfFieldID =
+ lbm::addPdfFieldToStorage(blockForest, "PDF field", latticeModel, impactVelocity, real_c(1), field::fzyx);
+
+ // add fill level field (initialized with 0, i.e., gas everywhere)
+ const BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill level field", real_c(0.0), field::fzyx, uint_c(2));
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ const real_t poolHeight = poolHeightFactor * dropDiameter;
+
+ // initialize a pool of liquid at the bottom of the domain in z-direction
+ const AABB poolAABB(real_c(0), real_c(0), real_c(0), real_c(domainSize[0]), real_c(domainSize[1]), poolHeight);
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ ScalarField_T* const fillField = blockIt->getData< ScalarField_T >(fillFieldID);
+ PdfField_T* const pdfField = blockIt->getData< PdfField_T >(pdfFieldID);
+
+ // determine the cells that are relevant for a block (still in global coordinates)
+ const CellInterval relevantCellBB = blockForest->getCellBBFromAABB(poolAABB.getIntersection(blockIt->getAABB()));
+
+ // transform the global coordinates of relevant cells to block local coordinates
+ CellInterval blockLocalCellBB;
+ blockForest->transformGlobalToBlockLocalCellInterval(blockLocalCellBB, *blockIt, relevantCellBB);
+
+ WALBERLA_FOR_ALL_CELLS_IN_INTERVAL_XYZ(blockLocalCellBB, {
+ fillField->get(x, y, z) = real_c(1);
+ pdfField->setDensityAndVelocity(x, y, z, Vector3< real_t >(real_c(0)), real_c(1));
+ }) // WALBERLA_FOR_ALL_CELLS_IN_INTERVAL_XYZ
+ }
+
+ const Vector3< real_t > dropCenter = dropCenterFactor * dropDiameter;
+
+ const geometry::Sphere sphereDrop(dropCenter, dropDiameter * real_c(0.5));
+ bubble_model::addBodyToFillLevelField< geometry::Sphere >(*blockForest, fillFieldID, sphereDrop, false);
+
+ // initialize boundary conditions from config file
+ const auto boundaryParameters = walberlaEnv.config()->getOneBlock("BoundaryParameters");
+ freeSurfaceBoundaryHandling->initFromConfig(boundaryParameters);
+
+ // IMPORTANT REMARK: this must be only called after every solid flag has been set; otherwise, the boundary handling
+ // might not detect solid flags correctly
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+
+ // communication after initialization
+ Communication_T communication(blockForest, flagFieldID, fillFieldID, forceFieldID);
+ communication();
+
+ PdfCommunication_T pdfCommunication(blockForest, pdfFieldID);
+ pdfCommunication();
+
+ // add bubble model
+ std::shared_ptr< bubble_model::BubbleModelBase > bubbleModel = nullptr;
+ if (enableBubbleModel)
+ {
+ const std::shared_ptr< bubble_model::BubbleModel< CommunicationStencil_T > > bubbleModelDerived =
+ std::make_shared< bubble_model::BubbleModel< CommunicationStencil_T > >(blockForest, enableBubbleSplits);
+ bubbleModelDerived->initFromFillLevelField(fillFieldID);
+ bubbleModelDerived->setAtmosphere(
+ Cell(domainSize[0] - uint_c(1), domainSize[1] - uint_c(1), domainSize[2] - uint_c(1)), real_c(1));
+
+ bubbleModel = std::static_pointer_cast< bubble_model::BubbleModelBase >(bubbleModelDerived);
+ }
+ else { bubbleModel = std::make_shared< bubble_model::BubbleModelConstantPressure >(real_c(1)); }
+
+ // initialize hydrostatic pressure
+ initHydrostaticPressure< PdfField_T >(blockForest, pdfFieldID, force, poolHeight);
+
+ // set density in non-liquid or non-interface cells to 1 (after initializing with hydrostatic pressure)
+ setDensityInNonFluidCellsToOne< FlagField_T, PdfField_T >(blockForest, flagInfo, flagFieldID, pdfFieldID);
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, timesteps);
+
+ // Laplace pressure = 2 * surface tension * curvature; curvature computation is not necessary with 0 surface tension
+ bool computeCurvature = false;
+ if (!realIsEqual(surfaceTension, real_c(0), real_c(1e-14))) { computeCurvature = true; }
+
+ // add surface geometry handler
+ const SurfaceGeometryHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > geometryHandler(
+ blockForest, freeSurfaceBoundaryHandling, fillFieldID, curvatureModel, computeCurvature, enableWetting,
+ contactAngle);
+
+ geometryHandler.addSweeps(timeloop);
+
+ const ConstBlockDataID curvatureFieldID = geometryHandler.getConstCurvatureFieldID();
+ const ConstBlockDataID normalFieldID = geometryHandler.getConstNormalFieldID();
+
+ // add boundary handling for standard boundaries and free surface boundaries
+ const SurfaceDynamicsHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > dynamicsHandler(
+ blockForest, pdfFieldID, flagFieldID, fillFieldID, forceFieldID, normalFieldID, curvatureFieldID,
+ freeSurfaceBoundaryHandling, bubbleModel, pdfReconstructionModel, pdfRefillingModel, excessMassDistributionModel,
+ relaxationRate, force, surfaceTension, enableForceWeighting, useSimpleMassExchange, cellConversionThreshold,
+ cellConversionForceThreshold);
+
+ dynamicsHandler.addSweeps(timeloop);
+
+ // add load balancing
+ const LoadBalancer< FlagField_T, CommunicationStencil_T, LatticeModelStencil_T > loadBalancer(
+ blockForest, communication, pdfCommunication, bubbleModel, uint_c(50), uint_c(10), uint_c(5),
+ loadBalancingFrequency, printLoadBalancingStatistics);
+ timeloop.addFuncAfterTimeStep(loadBalancer, "Sweep: load balancing");
+
+ // add VTK output
+ addVTKOutput< LatticeModel_T, FreeSurfaceBoundaryHandling_T, PdfField_T, FlagField_T, ScalarField_T, VectorField_T >(
+ blockForest, timeloop, walberlaEnv.config(), flagInfo, pdfFieldID, flagFieldID, fillFieldID, forceFieldID,
+ geometryHandler.getCurvatureFieldID(), geometryHandler.getNormalFieldID(),
+ geometryHandler.getObstNormalFieldID());
+
+ // add triangle mesh output of free surface
+ SurfaceMeshWriter< ScalarField_T, FlagField_T > surfaceMeshWriter(
+ blockForest, fillFieldID, flagFieldID, flagIDs::liquidInterfaceGasFlagIDs, real_c(0), walberlaEnv.config());
+ surfaceMeshWriter(); // write initial mesh
+ timeloop.addFuncAfterTimeStep(surfaceMeshWriter, "Writer: surface mesh");
+
+ // add logging for computational performance
+ const lbm::PerformanceLogger< FlagField_T > perfLogger(blockForest, flagFieldID, flagIDs::liquidInterfaceFlagIDs,
+ performanceLogFrequency);
+ timeloop.addFuncAfterTimeStep(perfLogger, "Evaluator: performance logging");
+
+ WcTimingPool timingPool;
+
+ for (uint_t t = uint_c(0); t != timesteps; ++t)
+ {
+ if (t % uint_c(real_c(timesteps / 100)) == uint_c(0))
+ {
+ WALBERLA_LOG_DEVEL_ON_ROOT("Performing timestep = " << t);
+ }
+ timeloop.singleStep(timingPool, true);
+
+ if (t % performanceLogFrequency == uint_c(0) && t > uint_c(0)) { timingPool.logResultOnRoot(); }
+ }
+
+ return EXIT_SUCCESS;
+}
+
+} // namespace DropImpact
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::DropImpact::main(argc, argv); }
\ No newline at end of file
diff --git a/apps/showcases/FreeSurface/DropImpact.prm b/apps/showcases/FreeSurface/DropImpact.prm
new file mode 100644
index 0000000000000000000000000000000000000000..07afacce7480bf9a0307180e4f5da17c1deebbbe
--- /dev/null
+++ b/apps/showcases/FreeSurface/DropImpact.prm
@@ -0,0 +1,110 @@
+BlockForestParameters
+{
+ cellsPerBlock < 10, 10, 10 >;
+ periodicity < 1, 1, 0 >;
+ loadBalancingFrequency 372;
+ printLoadBalancingStatistics true;
+}
+
+DomainParameters
+{
+ dropDiameter 20;
+ dropCenterFactor < 2, 2, 1 >; // values multiplied with dropDiameter
+ poolHeightFactor 0.5; // value multiplied with dropDiameter
+ domainSizeFactor < 10, 10, 5 >; // values multiplied with dropDiameter
+}
+
+PhysicsParameters
+{
+ bondNumber 3.18;
+ weberNumber 2010;
+ ohnesorgeNumber 0.0384;
+ relaxationRate 1.989;
+ impactAngleDegree 0;
+ enableWetting false;
+ contactAngle 0; // only used if enableWetting=true
+ timesteps 6000;
+}
+
+ModelParameters
+{
+ pdfReconstructionModel OnlyMissing;
+ pdfRefillingModel EquilibriumRefilling;
+ excessMassDistributionModel EvenlyAllInterface;
+ curvatureModel FiniteDifferenceMethod;
+ enableForceWeighting false;
+ useSimpleMassExchange false;
+ enableBubbleModel false;
+ enableBubbleSplits false; // only used if enableBubbleModel=true
+ cellConversionThreshold 1e-2;
+ cellConversionForceThreshold 1e-1;
+}
+
+EvaluationParameters
+{
+ performanceLogFrequency 3000;
+}
+
+BoundaryParameters
+{
+ // X
+ //Border { direction W; walldistance -1; NoSlip{} }
+ //Border { direction E; walldistance -1; NoSlip{} }
+
+ // Y
+ //Border { direction N; walldistance -1; NoSlip{} }
+ //Border { direction S; walldistance -1; NoSlip{} }
+
+ // Z
+ Border { direction T; walldistance -1; NoSlip{} }
+ Border { direction B; walldistance -1; NoSlip{} }
+}
+
+MeshOutputParameters
+{
+ writeFrequency 50;
+ baseFolder mesh-out;
+}
+
+VTK
+{
+ fluid_field
+ {
+ writeFrequency 1000;
+ ghostLayers 0;
+ baseFolder vtk-out;
+ samplingResolution 1;
+
+ writers
+ {
+ velocity;
+ density;
+ //pdf;
+ flag;
+ fill_level;
+ force;
+ curvature;
+ normal;
+ obstacle_normal;
+ mapped_flag;
+ }
+
+ inclusion_filters
+ {
+ // only include liquid and interface cells in VTK output
+ //liquidInterfaceFilter;
+ }
+
+ before_functions
+ {
+ //ghost_layer_synchronization; // only needed if writing the ghost layer
+ }
+
+ }
+ domain_decomposition
+ {
+ writeFrequency 372;
+ baseFolder vtk-out;
+ outputDomainDecomposition true;
+ }
+}
\ No newline at end of file
diff --git a/apps/showcases/FreeSurface/DropWetting.cpp b/apps/showcases/FreeSurface/DropWetting.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..20445deadacfbdda832dac862bf997006dd82066
--- /dev/null
+++ b/apps/showcases/FreeSurface/DropWetting.cpp
@@ -0,0 +1,421 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file DropWetting.cpp
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//
+// This showcase simulates a droplet on a plane with specified target contact angle. The resulting drop height can be
+// compared to an analytical model, as done in e.g.:
+// dissertation of S. Bogner (2017), section 4.4.3.2 , urn:nbn:de:bvb:29-opus4-87191
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+
+#include "lbm/PerformanceLogger.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface/LoadBalancing.h"
+#include "lbm/free_surface/SurfaceMeshWriter.h"
+#include "lbm/free_surface/VtkWriter.h"
+#include "lbm/free_surface/bubble_model/Geometry.h"
+#include "lbm/free_surface/dynamics/SurfaceDynamicsHandler.h"
+#include "lbm/free_surface/surface_geometry/SurfaceGeometryHandler.h"
+#include "lbm/free_surface/surface_geometry/Utility.h"
+#include "lbm/lattice_model/D3Q19.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace DropWetting
+{
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+
+using CollisionModel_T = lbm::collision_model::SRT;
+using ForceModel_T = lbm::force_model::GuoField< VectorField_T >;
+using LatticeModel_T = lbm::D3Q19< CollisionModel_T, true, ForceModel_T, 2 >;
+using LatticeModelStencil_T = LatticeModel_T::Stencil;
+using PdfField_T = lbm::PdfField< LatticeModel_T >;
+using PdfCommunication_T = blockforest::SimpleCommunication< LatticeModelStencil_T >;
+
+// the geometry computations in SurfaceGeometryHandler require meaningful values in the ghost layers in corner
+// directions (flag field and fill level field); this holds, even if the lattice model uses a D3Q19 stencil
+using CommunicationStencil_T =
+ typename std::conditional< LatticeModel_T::Stencil::D == uint_t(2), stencil::D2Q9, stencil::D3Q27 >::type;
+using Communication_T = blockforest::SimpleCommunication< CommunicationStencil_T >;
+
+using flag_t = uint32_t;
+using FlagField_T = FlagField< flag_t >;
+using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+// compute the L2 norm of the relative difference between the current and the previous time-averaged quantities
+template< typename FreeSurfaceBoundaryHandling_T >
+class DropHeightEvaluator
+{
+ public:
+ DropHeightEvaluator(const std::weak_ptr< const StructuredBlockForest >& blockForest,
+ const std::weak_ptr< const FreeSurfaceBoundaryHandling_T >& boundaryHandlingID,
+ const ConstBlockDataID& fillFieldID, const std::shared_ptr< real_t >& dropHeight,
+ uint_t interval)
+ : blockForest_(blockForest), freeSurfaceBoundaryHandling_(boundaryHandlingID), fillFieldID_(fillFieldID),
+ dropHeight_(dropHeight), interval_(interval), executionCounter_(uint_c(0))
+ {}
+
+ void operator()()
+ {
+ ++executionCounter_;
+
+ // only evaluate in given intervals
+ if (executionCounter_ % interval_ != uint_c(0)) { return; }
+
+ // compute the height of the spherical drop cap
+ computeDropHeight();
+ }
+
+ private:
+ std::weak_ptr< const StructuredBlockForest > blockForest_;
+ std::weak_ptr< const FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling_;
+ ConstBlockDataID fillFieldID_;
+
+ std::shared_ptr< real_t > dropHeight_;
+
+ uint_t interval_;
+
+ uint_t executionCounter_; // number of times operator() has been called
+
+ void computeDropHeight()
+ {
+ auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ auto freeSurfaceBoundaryHandling = freeSurfaceBoundaryHandling_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(freeSurfaceBoundaryHandling);
+
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ *dropHeight_ = real_c(0);
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ real_t maxDropHeight = real_c(0);
+
+ const FlagField_T* const flagField = blockIt->template getData< const FlagField_T >(flagFieldID);
+ const ScalarField_T* const fillField = blockIt->template getData< const ScalarField_T >(fillFieldID_);
+
+ WALBERLA_FOR_ALL_CELLS(
+ flagFieldIt, flagField, fillFieldIt, fillField,
+
+ if (flagInfo.isInterface(flagFieldIt)) {
+ Cell globalCell = flagFieldIt.cell();
+ blockForest->transformBlockLocalToGlobalCell(globalCell, *blockIt);
+
+ real_t currentDropHeight = real_c(globalCell.z()) + *fillFieldIt;
+ maxDropHeight = currentDropHeight > maxDropHeight ? currentDropHeight : maxDropHeight;
+ }) // WALBERLA_FOR_ALL_CELLS
+
+ if (maxDropHeight > *dropHeight_) { *dropHeight_ = maxDropHeight; }
+ }
+ // get maximum dropHeight among all processes
+ mpi::allReduceInplace< real_t >(*dropHeight_, mpi::MAX);
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(*dropHeight_);
+ }
+}; // class DropHeightEvaluator
+
+int main(int argc, char** argv)
+{
+ Environment walberlaEnv(argc, argv);
+
+ if (argc < 2) { WALBERLA_ABORT("Please specify a parameter file as input argument.") }
+
+ // print content of parameter file
+ WALBERLA_LOG_INFO_ON_ROOT(*walberlaEnv.config());
+
+ // get block forest parameters from parameter file
+ auto blockForestParameters = walberlaEnv.config()->getOneBlock("BlockForestParameters");
+ const Vector3< uint_t > cellsPerBlock = blockForestParameters.getParameter< Vector3< uint_t > >("cellsPerBlock");
+ const Vector3< bool > periodicity = blockForestParameters.getParameter< Vector3< bool > >("periodicity");
+ const uint_t loadBalancingFrequency = blockForestParameters.getParameter< uint_t >("loadBalancingFrequency");
+ const bool printLoadBalancingStatistics = blockForestParameters.getParameter< bool >("printLoadBalancingStatistics");
+
+ // read domain parameters from parameter file
+ const auto domainParameters = walberlaEnv.config()->getOneBlock("DomainParameters");
+ const real_t dropDiameter = domainParameters.getParameter< real_t >("dropDiameter");
+ const Vector3< real_t > domainSizeFactor = domainParameters.getParameter< Vector3< real_t > >("domainSizeFactor");
+
+ // define domain size
+ Vector3< uint_t > domainSize = domainSizeFactor * dropDiameter;
+ domainSize[0] = uint_c(domainSizeFactor[0] * dropDiameter);
+ domainSize[1] = uint_c(domainSizeFactor[1] * dropDiameter);
+ domainSize[2] = uint_c(domainSizeFactor[2] * dropDiameter);
+
+ // compute number of blocks as defined by domainSize and cellsPerBlock
+ Vector3< uint_t > numBlocks;
+ numBlocks[0] = uint_c(std::ceil(real_c(domainSize[0]) / real_c(cellsPerBlock[0])));
+ numBlocks[1] = uint_c(std::ceil(real_c(domainSize[1]) / real_c(cellsPerBlock[1])));
+ numBlocks[2] = uint_c(std::ceil(real_c(domainSize[2]) / real_c(cellsPerBlock[2])));
+
+ // get number of (MPI) processes
+ uint_t numProcesses = uint_c(MPIManager::instance()->numProcesses());
+ WALBERLA_CHECK_LESS_EQUAL(numProcesses, numBlocks[0] * numBlocks[1] * numBlocks[2],
+ "The number of MPI processes is greater than the number of blocks as defined by "
+ "\"domainSize/cellsPerBlock\". This would result in unused MPI processes. Either decrease "
+ "the number of MPI processes or increase \"cellsPerBlock\".")
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(numProcesses);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellsPerBlock);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(numBlocks);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(dropDiameter);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(domainSizeFactor);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(periodicity);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(domainSize);
+
+ Vector3< uint_t > realDomainSize;
+ realDomainSize[0] = cellsPerBlock[0] * numBlocks[0];
+ realDomainSize[1] = cellsPerBlock[1] * numBlocks[1];
+ realDomainSize[2] = cellsPerBlock[2] * numBlocks[2];
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(realDomainSize);
+
+ if (domainSize[0] != realDomainSize[0] && periodicity[0])
+ {
+ WALBERLA_ABORT(
+ "The specified domain size in x-direction can not be obtained with the number of blocks you specified.")
+ }
+ if (domainSize[1] != realDomainSize[1] && periodicity[1])
+ {
+ WALBERLA_ABORT(
+ "The specified domain size in y-direction can not be obtained with the number of blocks you specified.")
+ }
+ // the z-direction must be no slip in this setup and is simply extended (see below) to obtain the specified size
+ int boundaryThicknessZ = int_c(realDomainSize[2]) - int_c(domainSize[2]);
+ if (boundaryThicknessZ < 0)
+ {
+ WALBERLA_ABORT("Something went wrong: the resulting domain size in z-direction is less than specified.")
+ }
+
+ // read physics parameters from parameter file
+ const auto physicsParameters = walberlaEnv.config()->getOneBlock("PhysicsParameters");
+ const real_t relaxationRate = physicsParameters.getParameter< real_t >("relaxationRate");
+ const real_t surfaceTension = physicsParameters.getParameter< real_t >("surfaceTension");
+ const Vector3< real_t > force = physicsParameters.getParameter< Vector3< real_t > >("force");
+
+ const bool enableWetting = physicsParameters.getParameter< bool >("enableWetting");
+ const real_t contactAngle = physicsParameters.getParameter< real_t >("contactAngle");
+
+ const CollisionModel_T collisionModel = CollisionModel_T(relaxationRate);
+ const real_t viscosity = collisionModel.viscosity();
+
+ const uint_t timesteps = physicsParameters.getParameter< uint_t >("timesteps");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(relaxationRate);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(surfaceTension);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(force);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableWetting);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(contactAngle);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(timesteps);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(viscosity);
+
+ // read model parameters from parameter file
+ const auto modelParameters = walberlaEnv.config()->getOneBlock("ModelParameters");
+ const std::string pdfReconstructionModel = modelParameters.getParameter< std::string >("pdfReconstructionModel");
+ const std::string pdfRefillingModel = modelParameters.getParameter< std::string >("pdfRefillingModel");
+ const std::string excessMassDistributionModel =
+ modelParameters.getParameter< std::string >("excessMassDistributionModel");
+ const std::string curvatureModel = modelParameters.getParameter< std::string >("curvatureModel");
+ const bool enableForceWeighting = modelParameters.getParameter< bool >("enableForceWeighting");
+ const bool useSimpleMassExchange = modelParameters.getParameter< bool >("useSimpleMassExchange");
+ const bool enableBubbleModel = modelParameters.getParameter< bool >("enableBubbleModel");
+ const bool enableBubbleSplits = modelParameters.getParameter< bool >("enableBubbleSplits");
+ const real_t cellConversionThreshold = modelParameters.getParameter< real_t >("cellConversionThreshold");
+ const real_t cellConversionForceThreshold = modelParameters.getParameter< real_t >("cellConversionForceThreshold");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(pdfReconstructionModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(pdfRefillingModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(excessMassDistributionModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(curvatureModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableForceWeighting);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(useSimpleMassExchange);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableBubbleModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableBubbleSplits);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellConversionThreshold);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellConversionForceThreshold);
+
+ // read evaluation parameters from parameter file
+ const auto evaluationParameters = walberlaEnv.config()->getOneBlock("EvaluationParameters");
+ const uint_t performanceLogFrequency = evaluationParameters.getParameter< uint_t >("performanceLogFrequency");
+ const uint_t evaluationFrequency = evaluationParameters.getParameter< uint_t >("evaluationFrequency");
+ const real_t convergenceThreshold = evaluationParameters.getParameter< real_t >("convergenceThreshold");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(performanceLogFrequency);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(evaluationFrequency);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(convergenceThreshold);
+
+ // create non-uniform block forest (non-uniformity required for load balancing)
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ createNonUniformBlockForest(domainSize, cellsPerBlock, numBlocks, periodicity);
+
+ // add force field
+ const BlockDataID forceFieldID =
+ field::addToStorage< VectorField_T >(blockForest, "Force field", force, field::fzyx, uint_c(1));
+
+ // create lattice model
+ const LatticeModel_T latticeModel = LatticeModel_T(collisionModel, ForceModel_T(forceFieldID));
+
+ // add pdf field
+ const BlockDataID pdfFieldID = lbm::addPdfFieldToStorage(blockForest, "PDF field", latticeModel, field::fzyx);
+
+ // add fill level field (initialized with 0, i.e., gas everywhere)
+ const BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill level field", real_c(0.0), field::fzyx, uint_c(2));
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ // add spherical drop to fill level field
+ const geometry::Sphere sphereDrop(Vector3< real_t >(real_c(0.5) * real_c(domainSize[0]),
+ real_c(0.5) * real_c(domainSize[1]),
+ real_c(0.5) * real_c(dropDiameter)),
+ real_c(dropDiameter) * real_c(0.5));
+ bubble_model::addBodyToFillLevelField< geometry::Sphere >(*blockForest, fillFieldID, sphereDrop, false);
+
+ // initialize boundary conditions from config file
+ const auto boundaryParameters = walberlaEnv.config()->getOneBlock("BoundaryParameters");
+ freeSurfaceBoundaryHandling->initFromConfig(boundaryParameters);
+
+ // IMPORTANT REMARK: this must be only called after every solid flag has been set; otherwise, the boundary handling
+ // might not detect solid flags correctly
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+
+ // communication after initialization
+ Communication_T communication(blockForest, flagFieldID, fillFieldID, forceFieldID);
+ communication();
+
+ PdfCommunication_T pdfCommunication(blockForest, pdfFieldID);
+ pdfCommunication();
+
+ // add bubble model
+ std::shared_ptr< bubble_model::BubbleModelBase > bubbleModel = nullptr;
+ if (enableBubbleModel)
+ {
+ const std::shared_ptr< bubble_model::BubbleModel< CommunicationStencil_T > > bubbleModelDerived =
+ std::make_shared< bubble_model::BubbleModel< CommunicationStencil_T > >(blockForest, enableBubbleSplits);
+ bubbleModelDerived->initFromFillLevelField(fillFieldID);
+ bubbleModelDerived->setAtmosphere(
+ Cell(domainSize[0] - uint_c(1), domainSize[1] - uint_c(1), domainSize[2] - uint_c(1)), real_c(1));
+
+ bubbleModel = std::static_pointer_cast< bubble_model::BubbleModelBase >(bubbleModelDerived);
+ }
+ else { bubbleModel = std::make_shared< bubble_model::BubbleModelConstantPressure >(real_c(1)); }
+
+ // initialize hydrostatic pressure
+ initHydrostaticPressure< PdfField_T >(blockForest, pdfFieldID, force, real_c(0.5) * dropDiameter);
+
+ // set density in non-liquid or non-interface cells to 1 (after initializing with hydrostatic pressure)
+ setDensityInNonFluidCellsToOne< FlagField_T, PdfField_T >(blockForest, flagInfo, flagFieldID, pdfFieldID);
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, timesteps);
+
+ // Laplace pressure = 2 * surface tension * curvature; curvature computation is not necessary with 0 surface tension
+ bool computeCurvature = false;
+ if (!realIsEqual(surfaceTension, real_c(0), real_c(1e-14))) { computeCurvature = true; }
+
+ // add surface geometry handler
+ const SurfaceGeometryHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > geometryHandler(
+ blockForest, freeSurfaceBoundaryHandling, fillFieldID, curvatureModel, computeCurvature, enableWetting,
+ contactAngle);
+
+ geometryHandler.addSweeps(timeloop);
+
+ const ConstBlockDataID curvatureFieldID = geometryHandler.getConstCurvatureFieldID();
+ const ConstBlockDataID normalFieldID = geometryHandler.getConstNormalFieldID();
+
+ // add boundary handling for standard boundaries and free surface boundaries
+ const SurfaceDynamicsHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > dynamicsHandler(
+ blockForest, pdfFieldID, flagFieldID, fillFieldID, forceFieldID, normalFieldID, curvatureFieldID,
+ freeSurfaceBoundaryHandling, bubbleModel, pdfReconstructionModel, pdfRefillingModel, excessMassDistributionModel,
+ relaxationRate, force, surfaceTension, enableForceWeighting, useSimpleMassExchange, cellConversionThreshold,
+ cellConversionForceThreshold);
+
+ dynamicsHandler.addSweeps(timeloop);
+
+ // add load balancing
+ LoadBalancer< FlagField_T, CommunicationStencil_T, LatticeModelStencil_T > loadBalancer(
+ blockForest, communication, pdfCommunication, bubbleModel, uint_c(50), uint_c(10), uint_c(5),
+ loadBalancingFrequency, printLoadBalancingStatistics);
+ timeloop.addFuncAfterTimeStep(loadBalancer, "Sweep: load balancing");
+
+ // evaluate height of the drop
+ const std::shared_ptr< real_t > dropHeight = std::make_shared< real_t >(real_c(0));
+ const DropHeightEvaluator< FreeSurfaceBoundaryHandling_T > dropHeightEvaluator(
+ blockForest, freeSurfaceBoundaryHandling, fillFieldID, dropHeight, evaluationFrequency);
+ timeloop.addFuncAfterTimeStep(dropHeightEvaluator, "Evaluator: drop height");
+
+ // add VTK output
+ addVTKOutput< LatticeModel_T, FreeSurfaceBoundaryHandling_T, PdfField_T, FlagField_T, ScalarField_T, VectorField_T >(
+ blockForest, timeloop, walberlaEnv.config(), flagInfo, pdfFieldID, flagFieldID, fillFieldID, forceFieldID,
+ geometryHandler.getCurvatureFieldID(), geometryHandler.getNormalFieldID(),
+ geometryHandler.getObstNormalFieldID());
+
+ // add triangle mesh output of free surface
+ SurfaceMeshWriter< ScalarField_T, FlagField_T > surfaceMeshWriter(
+ blockForest, fillFieldID, flagFieldID, flagIDs::liquidInterfaceGasFlagIDs, real_c(1), walberlaEnv.config());
+ surfaceMeshWriter(); // write initial mesh
+ timeloop.addFuncAfterTimeStep(surfaceMeshWriter, "Writer: surface mesh");
+
+ // add logging for computational performance
+ const lbm::PerformanceLogger< FlagField_T > perfLogger(blockForest, flagFieldID, flagIDs::liquidInterfaceFlagIDs,
+ performanceLogFrequency);
+ timeloop.addFuncAfterTimeStep(perfLogger, "Evaluator: performance logging");
+
+ WcTimingPool timingPool;
+
+ real_t formerDropHeight = real_c(0);
+ for (uint_t t = uint_c(0); t != timesteps; ++t)
+ {
+ timeloop.singleStep(timingPool, true);
+
+ // check convergence
+ if (t % evaluationFrequency == uint_c(0))
+ {
+ WALBERLA_LOG_DEVEL_ON_ROOT("time step = " << t)
+ WALBERLA_LOG_DEVEL_ON_ROOT("\t\tdrop height = " << *dropHeight)
+ if (std::abs(formerDropHeight - *dropHeight) / *dropHeight < convergenceThreshold)
+ {
+ WALBERLA_LOG_DEVEL_ON_ROOT("Final converged drop height=" << *dropHeight);
+ return EXIT_SUCCESS;
+ }
+ formerDropHeight = *dropHeight;
+ }
+
+ if (t % performanceLogFrequency == uint_c(0) && t > uint_c(0)) { timingPool.logResultOnRoot(); }
+ }
+
+ WALBERLA_LOG_DEVEL_ON_ROOT("Final non-converged drop height=" << *dropHeight);
+
+ return EXIT_SUCCESS;
+}
+} // namespace DropWetting
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::DropWetting::main(argc, argv); }
\ No newline at end of file
diff --git a/apps/showcases/FreeSurface/DropWetting.prm b/apps/showcases/FreeSurface/DropWetting.prm
new file mode 100644
index 0000000000000000000000000000000000000000..bdfbe4e1ee632724634ad98b8ae2dfd5a8b1cd09
--- /dev/null
+++ b/apps/showcases/FreeSurface/DropWetting.prm
@@ -0,0 +1,108 @@
+BlockForestParameters
+{
+ cellsPerBlock < 10, 10, 10 >;
+ periodicity < 1, 1, 0 >;
+ loadBalancingFrequency 100;
+ printLoadBalancingStatistics true;
+}
+
+DomainParameters
+{
+ dropDiameter 20;
+ domainSizeFactor < 3, 3, 2 >; // values multiplied with dropDiameter
+}
+
+PhysicsParameters
+{
+ relaxationRate 1.96;
+ surfaceTension 8.37e-3;
+ force <0, 0, -1.14e-7>;
+ enableWetting true;
+ contactAngle 45; // only used if enableWetting=true
+ timesteps 10001;
+}
+
+ModelParameters
+{
+ pdfReconstructionModel OnlyMissing;
+ pdfRefillingModel EquilibriumRefilling;
+ excessMassDistributionModel EvenlyAllInterface;
+ curvatureModel FiniteDifferenceMethod;
+ enableForceWeighting false;
+ useSimpleMassExchange false;
+ enableBubbleModel false;
+ enableBubbleSplits false; // only used if enableBubbleModel=true
+ cellConversionThreshold 1e-2;
+ cellConversionForceThreshold 1e-1;
+}
+
+EvaluationParameters
+{
+ performanceLogFrequency 1000;
+ evaluationFrequency 200;
+ convergenceThreshold 1e-5;
+}
+
+BoundaryParameters
+{
+ // X
+ //Border { direction W; walldistance -1; NoSlip{} }
+ //Border { direction E; walldistance -1; NoSlip{} }
+
+ // Y
+ //Border { direction N; walldistance -1; NoSlip{} }
+ //Border { direction S; walldistance -1; NoSlip{} }
+
+ // Z
+ Border { direction T; walldistance -1; NoSlip{} }
+ Border { direction B; walldistance -1; NoSlip{} }
+}
+
+MeshOutputParameters
+{
+ writeFrequency 100;
+ baseFolder mesh-out;
+}
+
+VTK
+{
+ fluid_field
+ {
+ writeFrequency 100;
+ ghostLayers 0;
+ baseFolder vtk-out;
+ samplingResolution 1;
+
+ writers
+ {
+ velocity;
+ density;
+ //pdf;
+ flag;
+ fill_level;
+ force;
+ curvature;
+ normal;
+ obstacle_normal;
+ mapped_flag;
+ }
+
+ inclusion_filters
+ {
+ // only include liquid and interface cells in VTK output
+ //liquidInterfaceFilter;
+ }
+
+ before_functions
+ {
+ //ghost_layer_synchronization; // only needed if writing the ghost layer
+ }
+
+ }
+ domain_decomposition
+ {
+ writeFrequency 100;
+ baseFolder vtk-out;
+ outputDomainDecomposition true;
+ }
+}
\ No newline at end of file
diff --git a/apps/showcases/FreeSurface/GravityWave.cpp b/apps/showcases/FreeSurface/GravityWave.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..6faca3c70eb392845872bfb2b4e701519db7326d
--- /dev/null
+++ b/apps/showcases/FreeSurface/GravityWave.cpp
@@ -0,0 +1,579 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file GravityWave.cpp
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//
+// This showcase simulates a standing wave purely governed by gravity, i.e., without surface tension forces.
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+
+#include "field/Gather.h"
+
+#include "lbm/PerformanceLogger.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface/LoadBalancing.h"
+#include "lbm/free_surface/SurfaceMeshWriter.h"
+#include "lbm/free_surface/TotalMassComputer.h"
+#include "lbm/free_surface/VtkWriter.h"
+#include "lbm/free_surface/dynamics/SurfaceDynamicsHandler.h"
+#include "lbm/free_surface/surface_geometry/SurfaceGeometryHandler.h"
+#include "lbm/free_surface/surface_geometry/Utility.h"
+#include "lbm/lattice_model/D2Q9.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace GravityWave
+{
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+
+using CollisionModel_T = lbm::collision_model::SRT;
+using ForceModel_T = lbm::force_model::GuoField< VectorField_T >;
+using LatticeModel_T = lbm::D2Q9< CollisionModel_T, true, ForceModel_T, 2 >;
+using LatticeModelStencil_T = LatticeModel_T::Stencil;
+using PdfField_T = lbm::PdfField< LatticeModel_T >;
+using PdfCommunication_T = blockforest::SimpleCommunication< LatticeModelStencil_T >;
+
+// the geometry computations in SurfaceGeometryHandler require meaningful values in the ghost layers in corner
+// directions (flag field and fill level field); this holds, even if the lattice model uses a D3Q19 stencil
+using CommunicationStencil_T =
+ typename std::conditional< LatticeModel_T::Stencil::D == uint_t(2), stencil::D2Q9, stencil::D3Q27 >::type;
+using Communication_T = blockforest::SimpleCommunication< CommunicationStencil_T >;
+
+using flag_t = uint32_t;
+using FlagField_T = FlagField< flag_t >;
+using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+// write each entry in "vector" to line in a file; columns are separated by tabs
+template< typename T >
+void writeVectorToFile(const std::vector< T >& vector, const std::string& filename);
+
+// function describing the initialization profile (in global coordinates)
+inline real_t initializationProfile(real_t x, real_t amplitude, real_t offset, real_t wavelength)
+{
+ return amplitude * std::cos(x / wavelength * real_c(2) * math::pi + math::pi) + offset;
+}
+
+// evaluate the symmetry of the fill level field along the y-axis located at the center in x-direction
+// IMPORTANT REMARK: This implementation is very inefficient, as it gathers the field on a single process to perform the
+// evaluation.
+template< typename ScalarField_T >
+class SymmetryXEvaluator
+{
+ public:
+ SymmetryXEvaluator(const std::weak_ptr< StructuredBlockForest >& blockForest, const ConstBlockDataID& fillFieldID,
+ const Vector3< uint_t >& domainSize, uint_t interval,
+ const std::shared_ptr< real_t >& symmetryNorm)
+ : blockForest_(blockForest), fillFieldID_(fillFieldID), domainSize_(domainSize), interval_(interval),
+ symmetryNorm_(symmetryNorm), executionCounter_(uint_c(0))
+ {
+ auto blockForestPtr = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForestPtr);
+ }
+
+ void operator()()
+ {
+ auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ ++executionCounter_;
+
+ // only evaluate in given intervals
+ if (executionCounter_ % interval_ != uint_c(0) && executionCounter_ != uint_c(1)) { return; }
+
+ real_t fillLevelSum2 = real_c(0); // sum of each cell's squared fill level
+ real_t deltaFillLevelSum2 = real_c(0); // sum of each cell's fill level difference to its symmetrical counterpart
+
+ // gather the fill level field on rank 0 (WARNING: simple, but very inefficient)
+ std::shared_ptr< ScalarField_T > fillFieldGathered = nullptr;
+ WALBERLA_ROOT_SECTION()
+ {
+ fillFieldGathered =
+ std::make_shared< ScalarField_T >(domainSize_[0], domainSize_[1], domainSize_[2], uint_c(0));
+ }
+ field::gather< ScalarField_T, ScalarField_T >(*fillFieldGathered, blockForest, fillFieldID_);
+
+ WALBERLA_ROOT_SECTION()
+ {
+ // get field's center-coordinate in x-direction
+ uint_t fieldXCenter = fillFieldGathered->xSize() / uint_c(2);
+
+ WALBERLA_FOR_ALL_CELLS_XYZ(fillFieldGathered, {
+ // skip cells in the right half of the field in x-direction, as they are treated
+ // as mirrored cells later
+ if (x >= cell_idx_c(fieldXCenter)) { continue; }
+
+ // get this cell's x-distance to the field's center
+ uint_t cellDistXCenter = uint_c(std::abs(int_c(fieldXCenter) - int_c(x)));
+
+ // get x-coordinate of (mirrored) cell in the right half of the field
+ cell_idx_t fieldRightX = cell_idx_c(fieldXCenter + cellDistXCenter);
+ if (fillFieldGathered->xSize() % 2 == uint_c(0))
+ {
+ fieldRightX -= cell_idx_c(1); // if xSize is even, the blocks on the right must be shifted by -1
+ }
+
+ // get fill level
+ const real_t fillLevel = fillFieldGathered->get(x, y, z);
+ real_t fillLevelMirrored = real_c(0);
+ fillLevelMirrored = fillFieldGathered->get(fieldRightX, y, z);
+
+ fillLevelSum2 += fillLevel * fillLevel;
+
+ const real_t deltaFill = fillLevel - fillLevelMirrored;
+ deltaFillLevelSum2 += deltaFill * deltaFill;
+ }) // WALBERLA_FOR_ALL_CELLS_XYZ
+ }
+
+ // communicate values among all processes
+ mpi::allReduceInplace< real_t >(fillLevelSum2, mpi::SUM);
+ mpi::allReduceInplace< real_t >(deltaFillLevelSum2, mpi::SUM);
+
+ // compute L2 norm evaluate symmetry
+ *symmetryNorm_ = real_c(std::pow(deltaFillLevelSum2 / fillLevelSum2, real_c(0.5)));
+ }
+
+ private:
+ std::weak_ptr< StructuredBlockForest > blockForest_;
+ ConstBlockDataID fillFieldID_;
+ Vector3< uint_t > domainSize_;
+ uint_t interval_;
+ std::shared_ptr< real_t > symmetryNorm_;
+ uint_t executionCounter_;
+}; // class SymmetryXEvaluator
+
+// get interface position in y-direction at the specified (global) x-coordinate
+template< typename FreeSurfaceBoundaryHandling_T >
+class SurfaceYPositionEvaluator
+{
+ public:
+ SurfaceYPositionEvaluator(const std::weak_ptr< const StructuredBlockForest >& blockForest,
+ const std::weak_ptr< const FreeSurfaceBoundaryHandling_T >& freeSurfaceBoundaryHandling,
+ const ConstBlockDataID& fillFieldID, const Vector3< uint_t >& domainSize,
+ cell_idx_t globalXCoordinate, uint_t frequency,
+ const std::shared_ptr< real_t >& surfaceYPosition)
+ : blockForest_(blockForest), freeSurfaceBoundaryHandling_(freeSurfaceBoundaryHandling), fillFieldID_(fillFieldID),
+ domainSize_(domainSize), globalXCoordinate_(globalXCoordinate), surfaceYPosition_(surfaceYPosition),
+ frequency_(frequency), executionCounter_(uint_c(0))
+ {}
+
+ void operator()()
+ {
+ auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ auto freeSurfaceBoundaryHandling = freeSurfaceBoundaryHandling_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(freeSurfaceBoundaryHandling);
+
+ ++executionCounter_;
+
+ // only evaluate in given frequencies
+ if (executionCounter_ % frequency_ != uint_c(0) && executionCounter_ != uint_c(1)) { return; }
+
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ *surfaceYPosition_ = real_c(0);
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ real_t maxSurfaceYPosition = real_c(0);
+
+ CellInterval globalSearchInterval(globalXCoordinate_, cell_idx_c(0), cell_idx_c(0), globalXCoordinate_,
+ cell_idx_c(domainSize_[1]), cell_idx_c(0));
+
+ if (blockForest->getBlockCellBB(*blockIt).overlaps(globalSearchInterval))
+ {
+ // transform specified global x-coordinate into block local coordinate
+ Cell localEvalCell = Cell(globalXCoordinate_, cell_idx_c(0), cell_idx_c(0));
+ blockForest->transformGlobalToBlockLocalCell(localEvalCell, *blockIt);
+
+ const FlagField_T* const flagField = blockIt->template getData< const FlagField_T >(flagFieldID);
+ const ScalarField_T* const fillField = blockIt->template getData< const ScalarField_T >(fillFieldID_);
+
+ // searching from top ensures that the interface cell with the greatest y-coordinate is found first
+ for (cell_idx_t y = cell_idx_c((flagField)->ySize() - uint_c(1)); y >= cell_idx_t(0); --y)
+ {
+ if (flagInfo.isInterface(flagField->get(localEvalCell[0], y, cell_idx_c(0))))
+ {
+ const real_t fillLevel = fillField->get(localEvalCell[0], y, cell_idx_c(0));
+
+ // transform local y-coordinate to global coordinate
+ Cell localResultCell = localEvalCell;
+ localResultCell[1] = y;
+ blockForest->transformBlockLocalToGlobalCell(localResultCell, *blockIt);
+ maxSurfaceYPosition = real_c(localResultCell[1]) + fillLevel;
+
+ break;
+ }
+ }
+ }
+
+ if (maxSurfaceYPosition > *surfaceYPosition_) { *surfaceYPosition_ = maxSurfaceYPosition; }
+ }
+ // communicate result among all processes
+ mpi::allReduceInplace< real_t >(*surfaceYPosition_, mpi::MAX);
+ }
+
+ private:
+ std::weak_ptr< const StructuredBlockForest > blockForest_;
+ std::weak_ptr< const FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling_;
+ ConstBlockDataID fillFieldID_;
+ Vector3< uint_t > domainSize_;
+ cell_idx_t globalXCoordinate_;
+ std::shared_ptr< real_t > surfaceYPosition_;
+
+ uint_t frequency_;
+ uint_t executionCounter_;
+}; // class SurfaceYPositionEvaluator
+
+int main(int argc, char** argv)
+{
+ Environment walberlaEnv(argc, argv);
+
+ if (argc < 2) { WALBERLA_ABORT("Please specify a parameter file as input argument.") }
+
+ // print content of parameter file
+ WALBERLA_LOG_INFO_ON_ROOT(*walberlaEnv.config());
+
+ // get block forest parameters from parameter file
+ auto blockForestParameters = walberlaEnv.config()->getOneBlock("BlockForestParameters");
+ const Vector3< uint_t > cellsPerBlock = blockForestParameters.getParameter< Vector3< uint_t > >("cellsPerBlock");
+ const Vector3< bool > periodicity = blockForestParameters.getParameter< Vector3< bool > >("periodicity");
+ const uint_t loadBalancingFrequency = blockForestParameters.getParameter< uint_t >("loadBalancingFrequency");
+ const bool printLoadBalancingStatistics = blockForestParameters.getParameter< bool >("printLoadBalancingStatistics");
+
+ // get domain parameters from parameter file
+ auto domainParameters = walberlaEnv.config()->getOneBlock("DomainParameters");
+ const uint_t domainWidth = domainParameters.getParameter< uint_t >("domainWidth");
+ const real_t liquidDepth = domainParameters.getParameter< real_t >("liquidDepth");
+ const real_t initialAmplitude = domainParameters.getParameter< real_t >("initialAmplitude");
+
+ // define domain size
+ Vector3< uint_t > domainSize;
+ domainSize[0] = domainWidth;
+ domainSize[1] = uint_c(liquidDepth * real_c(2));
+ domainSize[2] = uint_c(1);
+
+ // compute number of blocks as defined by domainSize and cellsPerBlock
+ Vector3< uint_t > numBlocks;
+ numBlocks[0] = uint_c(std::ceil(real_c(domainSize[0]) / real_c(cellsPerBlock[0])));
+ numBlocks[1] = uint_c(std::ceil(real_c(domainSize[1]) / real_c(cellsPerBlock[1])));
+ numBlocks[2] = uint_c(std::ceil(real_c(domainSize[2]) / real_c(cellsPerBlock[2])));
+
+ // get number of (MPI) processes
+ uint_t numProcesses = uint_c(MPIManager::instance()->numProcesses());
+ WALBERLA_CHECK_LESS_EQUAL(numProcesses, numBlocks[0] * numBlocks[1] * numBlocks[2],
+ "The number of MPI processes is greater than the number of blocks as defined by "
+ "\"domainSize/cellsPerBlock\". This would result in unused MPI processes. Either decrease "
+ "the number of MPI processes or increase \"cellsPerBlock\".")
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(numProcesses);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellsPerBlock);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(domainSize);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(numBlocks);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(domainWidth);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(liquidDepth);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(initialAmplitude);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(periodicity);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(loadBalancingFrequency);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(printLoadBalancingStatistics);
+
+ // get physics parameters from parameter file
+ auto physicsParameters = walberlaEnv.config()->getOneBlock("PhysicsParameters");
+ const uint_t timesteps = physicsParameters.getParameter< uint_t >("timesteps");
+
+ const real_t relaxationRate = physicsParameters.getParameter< real_t >("relaxationRate");
+ const CollisionModel_T collisionModel = CollisionModel_T(relaxationRate);
+ const real_t viscosity = collisionModel.viscosity();
+
+ const real_t reynoldsNumber = physicsParameters.getParameter< real_t >("reynoldsNumber");
+ const real_t waveNumber = real_c(2) * math::pi / real_c(domainSize[0]);
+ const real_t waveFrequency = reynoldsNumber * viscosity / real_c(domainSize[0]) / initialAmplitude;
+ const real_t forceY = -(waveFrequency * waveFrequency) / waveNumber / std::tanh(waveNumber * liquidDepth);
+ const Vector3< real_t > force(real_c(0), forceY, real_c(0));
+
+ const bool enableWetting = physicsParameters.getParameter< bool >("enableWetting");
+ const real_t contactAngle = physicsParameters.getParameter< real_t >("contactAngle");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(reynoldsNumber);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(relaxationRate);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableWetting);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(contactAngle);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(timesteps);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(viscosity);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(force);
+
+ // read model parameters from parameter file
+ const auto modelParameters = walberlaEnv.config()->getOneBlock("ModelParameters");
+ const std::string pdfReconstructionModel = modelParameters.getParameter< std::string >("pdfReconstructionModel");
+ const std::string pdfRefillingModel = modelParameters.getParameter< std::string >("pdfRefillingModel");
+ const std::string excessMassDistributionModel =
+ modelParameters.getParameter< std::string >("excessMassDistributionModel");
+ const std::string curvatureModel = modelParameters.getParameter< std::string >("curvatureModel");
+ const bool enableForceWeighting = modelParameters.getParameter< bool >("enableForceWeighting");
+ const bool useSimpleMassExchange = modelParameters.getParameter< bool >("useSimpleMassExchange");
+ const real_t cellConversionThreshold = modelParameters.getParameter< real_t >("cellConversionThreshold");
+ const real_t cellConversionForceThreshold = modelParameters.getParameter< real_t >("cellConversionForceThreshold");
+ const bool enableBubbleModel = modelParameters.getParameter< bool >("enableBubbleModel");
+ const bool enableBubbleSplits = modelParameters.getParameter< bool >("enableBubbleSplits");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(pdfReconstructionModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(pdfRefillingModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(excessMassDistributionModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(curvatureModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableForceWeighting);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(useSimpleMassExchange);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellConversionThreshold);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellConversionForceThreshold);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableBubbleModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableBubbleSplits);
+
+ // read evaluation parameters from parameter file
+ const auto evaluationParameters = walberlaEnv.config()->getOneBlock("EvaluationParameters");
+ const uint_t performanceLogFrequency = evaluationParameters.getParameter< uint_t >("performanceLogFrequency");
+ const uint_t evaluationFrequency = evaluationParameters.getParameter< uint_t >("evaluationFrequency");
+ const std::string filename = evaluationParameters.getParameter< std::string >("filename");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(performanceLogFrequency);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(evaluationFrequency);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(filename);
+
+ // create non-uniform block forest (non-uniformity required for load balancing)
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ createNonUniformBlockForest(domainSize, cellsPerBlock, numBlocks, periodicity);
+
+ // add force field
+ const BlockDataID forceFieldID =
+ field::addToStorage< VectorField_T >(blockForest, "Force field", force, field::fzyx, uint_c(1));
+
+ // create lattice model
+ const LatticeModel_T latticeModel = LatticeModel_T(collisionModel, ForceModel_T(forceFieldID));
+
+ // add pdf field
+ const BlockDataID pdfFieldID = lbm::addPdfFieldToStorage(blockForest, "PDF field", latticeModel, field::fzyx);
+
+ // add fill level field (initialized with 0, i.e., gas everywhere)
+ const BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill level field", real_c(0.0), field::fzyx, uint_c(2));
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ // samples used in the Monte-Carlo-like estimation of the fill level
+ const uint_t fillLevelInitSamples = uint_c(100); // actually there will be 101 since 0 is also included
+
+ const uint_t numTotalPoints = (fillLevelInitSamples + uint_c(1)) * (fillLevelInitSamples + uint_c(1));
+ const real_t stepsize = real_c(1) / real_c(fillLevelInitSamples);
+
+ // initialize sine profile such that there is exactly one period in the domain, i.e., with wavelength=domainSize[0];
+ // every length is normalized with domainSize[0]
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ ScalarField_T* const fillField = blockIt->getData< ScalarField_T >(fillFieldID);
+
+ WALBERLA_FOR_ALL_CELLS(fillFieldIt, fillField, {
+ // cell in block-local coordinates
+ const Cell localCell = fillFieldIt.cell();
+
+ // get cell in global coordinates
+ Cell globalCell = fillFieldIt.cell();
+ blockForest->transformBlockLocalToGlobalCell(globalCell, *blockIt, localCell);
+
+ // Monte-Carlo like estimation of the fill level:
+ // create uniformly-distributed sample points in each cell and count the number of points below the sine
+ // profile; this fraction of points is used as the fill level to initialize the profile
+ uint_t numPointsBelow = uint_c(0);
+
+ for (uint_t xSample = uint_c(0); xSample <= fillLevelInitSamples; ++xSample)
+ {
+ // value of the sine-function
+ const real_t functionValue = initializationProfile(real_c(globalCell[0]) + real_c(xSample) * stepsize,
+ initialAmplitude, liquidDepth, real_c(domainSize[0]));
+
+ for (uint_t ySample = uint_c(0); ySample <= fillLevelInitSamples; ++ySample)
+ {
+ const real_t yPoint = real_c(globalCell[1]) + real_c(ySample) * stepsize;
+ // with operator <, a fill level of 1 can not be reached when the line is equal to the cell's top border;
+ // with operator <=, a fill level of 0 can not be reached when the line is equal to the cell's bottom
+ // border
+ if (yPoint < functionValue) { ++numPointsBelow; }
+ }
+ }
+
+ // fill level is fraction of points below sine profile
+ fillField->get(localCell) = real_c(numPointsBelow) / real_c(numTotalPoints);
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ // initialize domain boundary conditions from config file
+ const auto boundaryParameters = walberlaEnv.config()->getOneBlock("BoundaryParameters");
+ freeSurfaceBoundaryHandling->initFromConfig(boundaryParameters);
+
+ // IMPORTANT REMARK: this must be called only after every solid flag has been set; otherwise, the boundary handling
+ // might not detect solid flags correctly
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+
+ // communication after initialization
+ Communication_T communication(blockForest, flagFieldID, fillFieldID, forceFieldID);
+ communication();
+
+ PdfCommunication_T pdfCommunication(blockForest, pdfFieldID);
+ pdfCommunication();
+
+ // add bubble model
+ std::shared_ptr< bubble_model::BubbleModelBase > bubbleModel = nullptr;
+ if (enableBubbleModel)
+ {
+ const std::shared_ptr< bubble_model::BubbleModel< CommunicationStencil_T > > bubbleModelDerived =
+ std::make_shared< bubble_model::BubbleModel< CommunicationStencil_T > >(blockForest, enableBubbleSplits);
+ bubbleModelDerived->initFromFillLevelField(fillFieldID);
+ bubbleModelDerived->setAtmosphere(Cell(domainSize[0] - uint_c(1), domainSize[1] - uint_c(1), uint_c(0)),
+ real_c(1));
+
+ bubbleModel = std::static_pointer_cast< bubble_model::BubbleModelBase >(bubbleModelDerived);
+ }
+ else { bubbleModel = std::make_shared< bubble_model::BubbleModelConstantPressure >(real_c(1)); }
+
+ // initialize hydrostatic pressure
+ initHydrostaticPressure< PdfField_T >(blockForest, pdfFieldID, force, liquidDepth);
+
+ // set density in non-liquid or non-interface cells to one (after initializing with hydrostatic pressure)
+ setDensityInNonFluidCellsToOne< FlagField_T, PdfField_T >(blockForest, flagInfo, flagFieldID, pdfFieldID);
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, timesteps);
+
+ const real_t surfaceTension = real_c(0);
+
+ // Laplace pressure = 2 * surface tension * curvature; curvature computation is not necessary with zero surface
+ // tension
+ bool computeCurvature = false;
+ if (!realIsEqual(surfaceTension, real_c(0), real_c(1e-14))) { computeCurvature = true; }
+
+ // add surface geometry handler
+ const SurfaceGeometryHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > geometryHandler(
+ blockForest, freeSurfaceBoundaryHandling, fillFieldID, curvatureModel, computeCurvature, enableWetting,
+ contactAngle);
+
+ geometryHandler.addSweeps(timeloop);
+
+ // get fields created by surface geometry handler
+ const ConstBlockDataID curvatureFieldID = geometryHandler.getConstCurvatureFieldID();
+ const ConstBlockDataID normalFieldID = geometryHandler.getConstNormalFieldID();
+
+ // add boundary handling for standard boundaries and free surface boundaries
+ const SurfaceDynamicsHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > dynamicsHandler(
+ blockForest, pdfFieldID, flagFieldID, fillFieldID, forceFieldID, normalFieldID, curvatureFieldID,
+ freeSurfaceBoundaryHandling, bubbleModel, pdfReconstructionModel, pdfRefillingModel, excessMassDistributionModel,
+ relaxationRate, force, surfaceTension, enableForceWeighting, useSimpleMassExchange, cellConversionThreshold,
+ cellConversionForceThreshold);
+
+ dynamicsHandler.addSweeps(timeloop);
+
+ // add load balancing
+ const LoadBalancer< FlagField_T, CommunicationStencil_T, LatticeModelStencil_T > loadBalancer(
+ blockForest, communication, pdfCommunication, bubbleModel, uint_c(50), uint_c(10), uint_c(5),
+ loadBalancingFrequency, printLoadBalancingStatistics);
+ timeloop.addFuncAfterTimeStep(loadBalancer, "Sweep: load balancing");
+
+ // add sweep for evaluating the surface position in y-direction
+ const std::shared_ptr< real_t > surfaceYPosition = std::make_shared< real_t >(real_c(0));
+ const SurfaceYPositionEvaluator< FreeSurfaceBoundaryHandling_T > positionEvaluator(
+ blockForest, freeSurfaceBoundaryHandling, fillFieldID, domainSize, cell_idx_c(real_c(domainWidth) * real_c(0.5)),
+ evaluationFrequency, surfaceYPosition);
+ timeloop.addFuncAfterTimeStep(positionEvaluator, "Evaluator: surface position");
+
+ // add sweep for evaluating the symmetry of the fill level field in x-direction
+ const std::shared_ptr< real_t > symmetryNorm = std::make_shared< real_t >(real_c(0));
+ const SymmetryXEvaluator< ScalarField_T > symmetryEvaluator(blockForest, fillFieldID, domainSize,
+ evaluationFrequency, symmetryNorm);
+ timeloop.addFuncAfterTimeStep(symmetryEvaluator, "Evaluator: symmetry norm");
+
+ // add VTK output
+ addVTKOutput< LatticeModel_T, FreeSurfaceBoundaryHandling_T, PdfField_T, FlagField_T, ScalarField_T, VectorField_T >(
+ blockForest, timeloop, walberlaEnv.config(), flagInfo, pdfFieldID, flagFieldID, fillFieldID, forceFieldID,
+ geometryHandler.getCurvatureFieldID(), geometryHandler.getNormalFieldID(),
+ geometryHandler.getObstNormalFieldID());
+
+ // add triangle mesh output of free surface
+ SurfaceMeshWriter< ScalarField_T, FlagField_T > surfaceMeshWriter(
+ blockForest, fillFieldID, flagFieldID, flagIDs::liquidInterfaceGasFlagIDs, real_c(0), walberlaEnv.config());
+ surfaceMeshWriter(); // write initial mesh
+ timeloop.addFuncAfterTimeStep(surfaceMeshWriter, "Writer: surface mesh");
+
+ // add logging for computational performance
+ const lbm::PerformanceLogger< FlagField_T > performanceLogger(
+ blockForest, flagFieldID, flagIDs::liquidInterfaceFlagIDs, performanceLogFrequency);
+ timeloop.addFuncAfterTimeStep(performanceLogger, "Evaluator: performance logging");
+
+ WcTimingPool timingPool;
+
+ for (uint_t t = uint_c(0); t != timesteps; ++t)
+ {
+ timeloop.singleStep(timingPool, true);
+
+ WALBERLA_ROOT_SECTION()
+ {
+ // non-dimensionalize time and surface position
+ const real_t tNonDimensional = real_c(t) * waveFrequency;
+ const real_t positionNonDimensional = (*surfaceYPosition - liquidDepth) / initialAmplitude;
+
+ const std::vector< real_t > resultVector{ tNonDimensional, positionNonDimensional, *symmetryNorm };
+ if (t % evaluationFrequency == uint_c(0))
+ {
+ WALBERLA_LOG_DEVEL("time step = " << t);
+ WALBERLA_LOG_DEVEL("\t\ttNonDimensional = " << tNonDimensional
+ << "\n\t\tpositionNonDimensional = " << positionNonDimensional
+ << "\n\t\tsymmetryNorm = " << *symmetryNorm);
+ writeVectorToFile(resultVector, filename);
+ }
+ }
+
+ if (t % performanceLogFrequency == uint_c(0) && t > uint_c(0)) { timingPool.logResultOnRoot(); }
+ }
+
+ return EXIT_SUCCESS;
+}
+
+template< typename T >
+void writeVectorToFile(const std::vector< T >& vector, const std::string& filename)
+{
+ std::fstream file;
+ file.open(filename, std::fstream::app);
+
+ for (const auto i : vector)
+ {
+ file << "\t" << i;
+ }
+
+ file << "\n";
+ file.close();
+}
+
+} // namespace GravityWave
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::GravityWave::main(argc, argv); }
\ No newline at end of file
diff --git a/apps/showcases/FreeSurface/GravityWave.prm b/apps/showcases/FreeSurface/GravityWave.prm
new file mode 100644
index 0000000000000000000000000000000000000000..363a59c84abbc665dde520ebe4c1c1c89136874e
--- /dev/null
+++ b/apps/showcases/FreeSurface/GravityWave.prm
@@ -0,0 +1,107 @@
+BlockForestParameters
+{
+ cellsPerBlock < 25, 25, 1 >;
+ periodicity < 1, 0, 1 >;
+ loadBalancingFrequency 0;
+ printLoadBalancingStatistics false;
+}
+
+DomainParameters
+{
+ domainWidth 200; // equivalent to wavelength
+ liquidDepth 100;
+ initialAmplitude 2;
+}
+
+PhysicsParameters
+{
+ reynoldsNumber 10;
+ relaxationRate 1.8;
+ enableWetting false;
+ contactAngle 0; // only used if enableWetting=true
+ timesteps 86400;
+}
+
+ModelParameters
+{
+ pdfReconstructionModel OnlyMissing;
+ pdfRefillingModel EquilibriumRefilling;
+ excessMassDistributionModel EvenlyAllInterface;
+ curvatureModel FiniteDifferenceMethod;
+ enableForceWeighting false;
+ useSimpleMassExchange false;
+ cellConversionThreshold 1e-2;
+ cellConversionForceThreshold 1e-1;
+
+ enableBubbleModel false;
+ enableBubbleSplits false; // only used if enableBubbleModel=true
+}
+
+EvaluationParameters
+{
+ performanceLogFrequency 43200;
+ evaluationFrequency 864;
+ filename gravity-wave.txt;
+}
+
+BoundaryParameters
+{
+ // X
+ //Border { direction W; walldistance -1; NoSlip{} }
+ //Border { direction E; walldistance -1; NoSlip{} }
+
+ // Y
+ Border { direction N; walldistance -1; NoSlip{} }
+ Border { direction S; walldistance -1; NoSlip{} }
+
+ // Z
+ //Border { direction T; walldistance -1; NoSlip{} }
+ //Border { direction B; walldistance -1; NoSlip{} }
+}
+
+MeshOutputParameters
+{
+ writeFrequency 864;
+ baseFolder mesh-out;
+}
+
+VTK
+{
+ fluid_field
+ {
+ writeFrequency 864;
+ ghostLayers 0;
+ baseFolder vtk-out;
+ samplingResolution 1;
+
+ writers
+ {
+ fill_level;
+ mapped_flag;
+ velocity;
+ density;
+ //curvature;
+ //normal;
+ //obstacle_normal;
+ //pdf;
+ //flag;
+ //force;
+ }
+
+ inclusion_filters
+ {
+ //liquidInterfaceFilter; // only include liquid and interface cells in VTK output
+ }
+
+ before_functions
+ {
+ //ghost_layer_synchronization; // only needed if writing the ghost layer
+ }
+ }
+ domain_decomposition
+ {
+ writeFrequency 0;
+ baseFolder vtk-out;
+ outputDomainDecomposition true;
+ }
+}
\ No newline at end of file
diff --git a/apps/showcases/FreeSurface/GravityWaveCodegen.cpp b/apps/showcases/FreeSurface/GravityWaveCodegen.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..a6b41aea0bc98dfd558dabe42f12a50675263df3
--- /dev/null
+++ b/apps/showcases/FreeSurface/GravityWaveCodegen.cpp
@@ -0,0 +1,580 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file GravityWaveCodegen.cpp
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//
+// This showcase simulates a standing wave purely governed by gravity, i.e., without surface tension forces. The
+// implementation uses an LBM kernel generated with lbmpy.
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+
+#include "field/Gather.h"
+
+#include "lbm/PerformanceLogger.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface/LoadBalancing.h"
+#include "lbm/free_surface/SurfaceMeshWriter.h"
+#include "lbm/free_surface/TotalMassComputer.h"
+#include "lbm/free_surface/VtkWriter.h"
+#include "lbm/free_surface/bubble_model/Geometry.h"
+#include "lbm/free_surface/dynamics/SurfaceDynamicsHandler.h"
+#include "lbm/free_surface/surface_geometry/SurfaceGeometryHandler.h"
+#include "lbm/free_surface/surface_geometry/Utility.h"
+#include "lbm/lattice_model/D3Q19.h"
+
+#include "GravityWaveLatticeModel.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace GravityWaveCodegen
+{
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+
+using LatticeModel_T = lbm::GravityWaveLatticeModel;
+using LatticeModelStencil_T = LatticeModel_T::Stencil;
+using PdfField_T = lbm::PdfField< LatticeModel_T >;
+using PdfCommunication_T = blockforest::SimpleCommunication< LatticeModelStencil_T >;
+
+// the geometry computations in SurfaceGeometryHandler require meaningful values in the ghost layers in corner
+// directions (flag field and fill level field); this holds, even if the lattice model uses a D3Q19 stencil
+using CommunicationStencil_T =
+ typename std::conditional< LatticeModel_T::Stencil::D == uint_t(2), stencil::D2Q9, stencil::D3Q27 >::type;
+using Communication_T = blockforest::SimpleCommunication< CommunicationStencil_T >;
+
+using flag_t = uint32_t;
+using FlagField_T = FlagField< flag_t >;
+using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+// write each entry in "vector" to line in a file; columns are separated by tabs
+template< typename T >
+void writeVectorToFile(const std::vector< T >& vector, const std::string& filename);
+
+// function describing the global initialization profile
+inline real_t initializationProfile(real_t x, real_t amplitude, real_t offset, real_t wavelength)
+{
+ return amplitude * std::cos(x / wavelength * real_c(2) * math::pi + math::pi) + offset;
+}
+
+// evaluate the symmetry of the fill level field along the y-axis located at the center in x-direction
+// IMPORTANT REMARK: This implementation is very inefficient, as it gathers the field on a single process to perform the
+// evaluation.
+template< typename ScalarField_T >
+class SymmetryXEvaluator
+{
+ public:
+ SymmetryXEvaluator(const std::weak_ptr< StructuredBlockForest >& blockForest, const ConstBlockDataID& fillFieldID,
+ const Vector3< uint_t >& domainSize, uint_t interval,
+ const std::shared_ptr< real_t >& symmetryNorm)
+ : blockForest_(blockForest), fillFieldID_(fillFieldID), domainSize_(domainSize), interval_(interval),
+ symmetryNorm_(symmetryNorm), executionCounter_(uint_c(0))
+ {
+ auto blockForestPtr = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForestPtr);
+ }
+
+ void operator()()
+ {
+ auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ ++executionCounter_;
+
+ // only evaluate in given intervals
+ if (executionCounter_ % interval_ != uint_c(0) && executionCounter_ != uint_c(1)) { return; }
+
+ real_t fillLevelSum2 = real_c(0); // sum of each cell's squared fill level
+ real_t deltaFillLevelSum2 = real_c(0); // sum of each cell's fill level difference to its symmetrical counterpart
+
+ // gather the fill level field on rank 0 (WARNING: simple, but very inefficient)
+ std::shared_ptr< ScalarField_T > fillFieldGathered = nullptr;
+ WALBERLA_ROOT_SECTION()
+ {
+ fillFieldGathered =
+ std::make_shared< ScalarField_T >(domainSize_[0], domainSize_[1], domainSize_[2], uint_c(0));
+ }
+ field::gather< ScalarField_T, ScalarField_T >(*fillFieldGathered, blockForest, fillFieldID_);
+
+ WALBERLA_ROOT_SECTION()
+ {
+ // get field's center-coordinate in x-direction
+ uint_t fieldXCenter = fillFieldGathered->xSize() / uint_c(2);
+
+ WALBERLA_FOR_ALL_CELLS_XYZ(fillFieldGathered, {
+ // skip cells in the right half of the field in x-direction, as they are treated
+ // as mirrored cells later
+ if (x >= cell_idx_c(fieldXCenter)) { continue; }
+
+ // get this cell's x-distance to the field's center
+ uint_t cellDistXCenter = uint_c(std::abs(int_c(fieldXCenter) - int_c(x)));
+
+ // get x-coordinate of (mirrored) cell in the right half of the field
+ cell_idx_t fieldRightX = cell_idx_c(fieldXCenter + cellDistXCenter);
+ if (fillFieldGathered->xSize() % 2 == uint_c(0))
+ {
+ fieldRightX -= cell_idx_c(1); // if xSize is even, the blocks on the right must be shifted by -1
+ }
+
+ // get fill level
+ const real_t fillLevel = fillFieldGathered->get(x, y, z);
+ real_t fillLevelMirrored = real_c(0);
+ fillLevelMirrored = fillFieldGathered->get(fieldRightX, y, z);
+
+ fillLevelSum2 += fillLevel * fillLevel;
+
+ const real_t deltaFill = fillLevel - fillLevelMirrored;
+ deltaFillLevelSum2 += deltaFill * deltaFill;
+ }) // WALBERLA_FOR_ALL_CELLS_XYZ
+ }
+
+ // communicate values among all processes
+ mpi::allReduceInplace< real_t >(fillLevelSum2, mpi::SUM);
+ mpi::allReduceInplace< real_t >(deltaFillLevelSum2, mpi::SUM);
+
+ // compute L2 norm evaluate symmetry
+ *symmetryNorm_ = real_c(std::pow(deltaFillLevelSum2 / fillLevelSum2, real_c(0.5)));
+ }
+
+ private:
+ std::weak_ptr< StructuredBlockForest > blockForest_;
+ ConstBlockDataID fillFieldID_;
+ Vector3< uint_t > domainSize_;
+ uint_t interval_;
+ std::shared_ptr< real_t > symmetryNorm_;
+ uint_t executionCounter_;
+}; // class SymmetryXEvaluator
+
+// get interface position in y-direction at the specified (global) x-coordinate
+template< typename FreeSurfaceBoundaryHandling_T >
+class SurfaceYPositionEvaluator
+{
+ public:
+ SurfaceYPositionEvaluator(const std::weak_ptr< const StructuredBlockForest >& blockForest,
+ const std::weak_ptr< const FreeSurfaceBoundaryHandling_T >& freeSurfaceBoundaryHandling,
+ const ConstBlockDataID& fillFieldID, const Vector3< uint_t >& domainSize,
+ cell_idx_t globalXCoordinate, uint_t frequency,
+ const std::shared_ptr< real_t >& surfaceYPosition)
+ : blockForest_(blockForest), freeSurfaceBoundaryHandling_(freeSurfaceBoundaryHandling), fillFieldID_(fillFieldID),
+ domainSize_(domainSize), globalXCoordinate_(globalXCoordinate), surfaceYPosition_(surfaceYPosition),
+ frequency_(frequency), executionCounter_(uint_c(0))
+ {}
+
+ void operator()()
+ {
+ auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ auto freeSurfaceBoundaryHandling = freeSurfaceBoundaryHandling_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(freeSurfaceBoundaryHandling);
+
+ ++executionCounter_;
+
+ // only evaluate in given frequencies
+ if (executionCounter_ % frequency_ != uint_c(0) && executionCounter_ != uint_c(1)) { return; }
+
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ *surfaceYPosition_ = real_c(0);
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ real_t maxSurfaceYPosition = real_c(0);
+
+ CellInterval globalSearchInterval(globalXCoordinate_, cell_idx_c(0), cell_idx_c(0), globalXCoordinate_,
+ cell_idx_c(domainSize_[1]), cell_idx_c(0));
+
+ if (blockForest->getBlockCellBB(*blockIt).overlaps(globalSearchInterval))
+ {
+ // transform specified global x-coordinate into block local coordinate
+ Cell localEvalCell = Cell(globalXCoordinate_, cell_idx_c(0), cell_idx_c(0));
+ blockForest->transformGlobalToBlockLocalCell(localEvalCell, *blockIt);
+
+ const FlagField_T* const flagField = blockIt->template getData< const FlagField_T >(flagFieldID);
+ const ScalarField_T* const fillField = blockIt->template getData< const ScalarField_T >(fillFieldID_);
+
+ // searching from top ensures that the interface cell with the greatest y-coordinate is found first
+ for (cell_idx_t y = cell_idx_c((flagField)->ySize() - uint_c(1)); y >= cell_idx_t(0); --y)
+ {
+ if (flagInfo.isInterface(flagField->get(localEvalCell[0], y, cell_idx_c(0))))
+ {
+ const real_t fillLevel = fillField->get(localEvalCell[0], y, cell_idx_c(0));
+
+ // transform local y-coordinate to global coordinate
+ Cell localResultCell = localEvalCell;
+ localResultCell[1] = y;
+ blockForest->transformBlockLocalToGlobalCell(localResultCell, *blockIt);
+ maxSurfaceYPosition = real_c(localResultCell[1]) + fillLevel;
+
+ break;
+ }
+ }
+ }
+
+ if (maxSurfaceYPosition > *surfaceYPosition_) { *surfaceYPosition_ = maxSurfaceYPosition; }
+ }
+ // communicate result among all processes
+ mpi::allReduceInplace< real_t >(*surfaceYPosition_, mpi::MAX);
+ }
+
+ private:
+ std::weak_ptr< const StructuredBlockForest > blockForest_;
+ std::weak_ptr< const FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling_;
+ ConstBlockDataID fillFieldID_;
+ Vector3< uint_t > domainSize_;
+ cell_idx_t globalXCoordinate_;
+ std::shared_ptr< real_t > surfaceYPosition_;
+
+ uint_t frequency_;
+ uint_t executionCounter_;
+}; // class SurfaceYPositionEvaluator
+
+int main(int argc, char** argv)
+{
+ Environment walberlaEnv(argc, argv);
+
+ if (argc < 2) { WALBERLA_ABORT("Please specify a parameter file as input argument.") }
+
+ // print content of parameter file
+ WALBERLA_LOG_INFO_ON_ROOT(*walberlaEnv.config());
+
+ // get block forest parameters from parameter file
+ auto blockForestParameters = walberlaEnv.config()->getOneBlock("BlockForestParameters");
+ const Vector3< uint_t > cellsPerBlock = blockForestParameters.getParameter< Vector3< uint_t > >("cellsPerBlock");
+ const Vector3< bool > periodicity = blockForestParameters.getParameter< Vector3< bool > >("periodicity");
+ const uint_t loadBalancingFrequency = blockForestParameters.getParameter< uint_t >("loadBalancingFrequency");
+ const bool printLoadBalancingStatistics = blockForestParameters.getParameter< bool >("printLoadBalancingStatistics");
+
+ // get domain parameters from parameter file
+ auto domainParameters = walberlaEnv.config()->getOneBlock("DomainParameters");
+ const uint_t domainWidth = domainParameters.getParameter< uint_t >("domainWidth");
+ const real_t liquidDepth = domainParameters.getParameter< real_t >("liquidDepth");
+ const real_t initialAmplitude = domainParameters.getParameter< real_t >("initialAmplitude");
+
+ // define domain size
+ Vector3< uint_t > domainSize;
+ domainSize[0] = domainWidth;
+ domainSize[1] = uint_c(liquidDepth * real_c(2));
+ domainSize[2] = uint_c(1);
+
+ // compute number of blocks as defined by domainSize and cellsPerBlock
+ Vector3< uint_t > numBlocks;
+ numBlocks[0] = uint_c(std::ceil(real_c(domainSize[0]) / real_c(cellsPerBlock[0])));
+ numBlocks[1] = uint_c(std::ceil(real_c(domainSize[1]) / real_c(cellsPerBlock[1])));
+ numBlocks[2] = uint_c(std::ceil(real_c(domainSize[2]) / real_c(cellsPerBlock[2])));
+
+ // get number of (MPI) processes
+ uint_t numProcesses = uint_c(MPIManager::instance()->numProcesses());
+ WALBERLA_CHECK_LESS_EQUAL(numProcesses, numBlocks[0] * numBlocks[1] * numBlocks[2],
+ "The number of MPI processes is greater than the number of blocks as defined by "
+ "\"domainSize/cellsPerBlock\". This would result in unused MPI processes. Either decrease "
+ "the number of MPI processes or increase \"cellsPerBlock\".")
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(numProcesses);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellsPerBlock);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(domainSize);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(numBlocks);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(domainWidth);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(liquidDepth);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(initialAmplitude);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(periodicity);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(loadBalancingFrequency);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(printLoadBalancingStatistics);
+
+ // get physics parameters from parameter file
+ auto physicsParameters = walberlaEnv.config()->getOneBlock("PhysicsParameters");
+ const uint_t timesteps = physicsParameters.getParameter< uint_t >("timesteps");
+
+ const real_t relaxationRate = physicsParameters.getParameter< real_t >("relaxationRate");
+ const real_t viscosity = real_c(1) / real_c(3) * (real_c(1) / relaxationRate - real_c(0.5));
+
+ const real_t reynoldsNumber = physicsParameters.getParameter< real_t >("reynoldsNumber");
+ const real_t waveNumber = real_c(2) * math::pi / real_c(domainSize[0]);
+ const real_t waveFrequency = reynoldsNumber * viscosity / real_c(domainSize[0]) / initialAmplitude;
+ const real_t forceY = -(waveFrequency * waveFrequency) / waveNumber / std::tanh(waveNumber * liquidDepth);
+ const Vector3< real_t > force(real_c(0), forceY, real_c(0));
+
+ const bool enableWetting = physicsParameters.getParameter< bool >("enableWetting");
+ const real_t contactAngle = physicsParameters.getParameter< real_t >("contactAngle");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(reynoldsNumber);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(relaxationRate);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableWetting);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(contactAngle);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(timesteps);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(viscosity);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(force);
+
+ // read model parameters from parameter file
+ const auto modelParameters = walberlaEnv.config()->getOneBlock("ModelParameters");
+ const std::string pdfReconstructionModel = modelParameters.getParameter< std::string >("pdfReconstructionModel");
+ const std::string pdfRefillingModel = modelParameters.getParameter< std::string >("pdfRefillingModel");
+ const std::string excessMassDistributionModel =
+ modelParameters.getParameter< std::string >("excessMassDistributionModel");
+ const std::string curvatureModel = modelParameters.getParameter< std::string >("curvatureModel");
+ const bool enableForceWeighting = modelParameters.getParameter< bool >("enableForceWeighting");
+ const bool useSimpleMassExchange = modelParameters.getParameter< bool >("useSimpleMassExchange");
+ const real_t cellConversionThreshold = modelParameters.getParameter< real_t >("cellConversionThreshold");
+ const real_t cellConversionForceThreshold = modelParameters.getParameter< real_t >("cellConversionForceThreshold");
+ const bool enableBubbleModel = modelParameters.getParameter< bool >("enableBubbleModel");
+ const bool enableBubbleSplits = modelParameters.getParameter< bool >("enableBubbleSplits");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(pdfReconstructionModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(pdfRefillingModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(excessMassDistributionModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(curvatureModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableForceWeighting);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(useSimpleMassExchange);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellConversionThreshold);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellConversionForceThreshold);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableBubbleModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableBubbleSplits);
+
+ // read evaluation parameters from parameter file
+ const auto evaluationParameters = walberlaEnv.config()->getOneBlock("EvaluationParameters");
+ const uint_t performanceLogFrequency = evaluationParameters.getParameter< uint_t >("performanceLogFrequency");
+ const uint_t evaluationFrequency = evaluationParameters.getParameter< uint_t >("evaluationFrequency");
+ const std::string filename = evaluationParameters.getParameter< std::string >("filename");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(performanceLogFrequency);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(evaluationFrequency);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(filename);
+
+ // create non-uniform block forest (non-uniformity required for load balancing)
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ createNonUniformBlockForest(domainSize, cellsPerBlock, numBlocks, periodicity);
+
+ // add force field
+ const BlockDataID forceFieldID =
+ field::addToStorage< VectorField_T >(blockForest, "Force field", force, field::fzyx, uint_c(1));
+
+ // create lattice model
+ LatticeModel_T latticeModel = LatticeModel_T(force[0], force[1], force[2], relaxationRate);
+
+ // add pdf field
+ const BlockDataID pdfFieldID = lbm::addPdfFieldToStorage(blockForest, "PDF field", latticeModel, field::fzyx);
+
+ // add fill level field (initialized with 0, i.e., gas everywhere)
+ const BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill level field", real_c(0.0), field::fzyx, uint_c(2));
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ // samples used in the Monte-Carlo like estimation of the fill level
+ const uint_t fillLevelInitSamples = uint_c(100); // actually there will be 101 since 0 is also included
+
+ const uint_t numTotalPoints = (fillLevelInitSamples + uint_c(1)) * (fillLevelInitSamples + uint_c(1));
+ const real_t stepsize = real_c(1) / real_c(fillLevelInitSamples);
+
+ // initialize sine profile such that there is exactly one period in the domain, i.e., with wavelength=domainSize[0];
+ // every length is normalized with domainSize[0]
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ ScalarField_T* const fillField = blockIt->getData< ScalarField_T >(fillFieldID);
+
+ WALBERLA_FOR_ALL_CELLS(fillFieldIt, fillField, {
+ // cell in block-local coordinates
+ const Cell localCell = fillFieldIt.cell();
+
+ // get cell in global coordinates
+ Cell globalCell = fillFieldIt.cell();
+ blockForest->transformBlockLocalToGlobalCell(globalCell, *blockIt, localCell);
+
+ // Monte-Carlo like estimation of the fill level:
+ // create uniformly-distributed sample points in each cell and count the number of points below the sine
+ // profile; this fraction of points is used as the fill level to initialize the profile
+ uint_t numPointsBelow = uint_c(0);
+
+ for (uint_t xSample = uint_c(0); xSample <= fillLevelInitSamples; ++xSample)
+ {
+ // value of the sine-function
+ const real_t functionValue = initializationProfile(real_c(globalCell[0]) + real_c(xSample) * stepsize,
+ initialAmplitude, liquidDepth, real_c(domainSize[0]));
+
+ for (uint_t ySample = uint_c(0); ySample <= fillLevelInitSamples; ++ySample)
+ {
+ const real_t yPoint = real_c(globalCell[1]) + real_c(ySample) * stepsize;
+ // with operator <, a fill level of 1 can not be reached when the line is equal to the cell's top border;
+ // with operator <=, a fill level of 0 can not be reached when the line is equal to the cell's bottom
+ // border
+ if (yPoint < functionValue) { ++numPointsBelow; }
+ }
+ }
+
+ // fill level is fraction of points below sine profile
+ fillField->get(localCell) = real_c(numPointsBelow) / real_c(numTotalPoints);
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ // initialize domain boundary conditions from config file
+ const auto boundaryParameters = walberlaEnv.config()->getOneBlock("BoundaryParameters");
+ freeSurfaceBoundaryHandling->initFromConfig(boundaryParameters);
+
+ // IMPORTANT REMARK: this must be only called after every solid flag has been set; otherwise, the boundary handling
+ // might not detect solid flags correctly
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+
+ // communication after initialization
+ Communication_T communication(blockForest, flagFieldID, fillFieldID, forceFieldID);
+ communication();
+
+ PdfCommunication_T pdfCommunication(blockForest, pdfFieldID);
+ pdfCommunication();
+
+ // add bubble model
+ std::shared_ptr< bubble_model::BubbleModelBase > bubbleModel = nullptr;
+ if (enableBubbleModel)
+ {
+ const std::shared_ptr< bubble_model::BubbleModel< CommunicationStencil_T > > bubbleModelDerived =
+ std::make_shared< bubble_model::BubbleModel< CommunicationStencil_T > >(blockForest, enableBubbleSplits);
+ bubbleModelDerived->initFromFillLevelField(fillFieldID);
+ bubbleModelDerived->setAtmosphere(Cell(domainSize[0] - uint_c(1), domainSize[1] - uint_c(1), uint_c(0)),
+ real_c(1));
+
+ bubbleModel = std::static_pointer_cast< bubble_model::BubbleModelBase >(bubbleModelDerived);
+ }
+ else { bubbleModel = std::make_shared< bubble_model::BubbleModelConstantPressure >(real_c(1)); }
+
+ // initialize hydrostatic pressure
+ initHydrostaticPressure< PdfField_T >(blockForest, pdfFieldID, force, liquidDepth);
+
+ // set density in non-liquid or non-interface cells to 1 (after initializing with hydrostatic pressure)
+ setDensityInNonFluidCellsToOne< FlagField_T, PdfField_T >(blockForest, flagInfo, flagFieldID, pdfFieldID);
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, timesteps);
+
+ const real_t surfaceTension = real_c(0);
+
+ // Laplace pressure = 2 * surface tension * curvature; curvature computation is not necessary with no surface
+ // tension
+ bool computeCurvature = false;
+ if (!realIsEqual(surfaceTension, real_c(0), real_c(1e-14))) { computeCurvature = true; }
+
+ // add surface geometry handler
+ const SurfaceGeometryHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > geometryHandler(
+ blockForest, freeSurfaceBoundaryHandling, fillFieldID, curvatureModel, computeCurvature, enableWetting,
+ contactAngle);
+
+ geometryHandler.addSweeps(timeloop);
+
+ // get fields created by surface geometry handler
+ const ConstBlockDataID curvatureFieldID = geometryHandler.getConstCurvatureFieldID();
+ const ConstBlockDataID normalFieldID = geometryHandler.getConstNormalFieldID();
+
+ // add boundary handling for standard boundaries and free surface boundaries
+ const SurfaceDynamicsHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T, true > dynamicsHandler(
+ blockForest, pdfFieldID, flagFieldID, fillFieldID, forceFieldID, normalFieldID, curvatureFieldID,
+ freeSurfaceBoundaryHandling, bubbleModel, pdfReconstructionModel, pdfRefillingModel, excessMassDistributionModel,
+ relaxationRate, force, surfaceTension, enableForceWeighting, useSimpleMassExchange, cellConversionThreshold,
+ cellConversionForceThreshold);
+
+ dynamicsHandler.addSweeps(timeloop);
+
+ // add load balancing
+ const LoadBalancer< FlagField_T, CommunicationStencil_T, LatticeModelStencil_T > loadBalancer(
+ blockForest, communication, pdfCommunication, bubbleModel, uint_c(50), uint_c(10), uint_c(5),
+ loadBalancingFrequency, printLoadBalancingStatistics);
+ timeloop.addFuncAfterTimeStep(loadBalancer, "Sweep: load balancing");
+
+ // add sweep for evaluating the surface position in y-direction
+ const std::shared_ptr< real_t > surfaceYPosition = std::make_shared< real_t >(real_c(0));
+ const SurfaceYPositionEvaluator< FreeSurfaceBoundaryHandling_T > positionEvaluator(
+ blockForest, freeSurfaceBoundaryHandling, fillFieldID, domainSize, cell_idx_c(real_c(domainWidth) * real_c(0.5)),
+ evaluationFrequency, surfaceYPosition);
+ timeloop.addFuncAfterTimeStep(positionEvaluator, "Evaluator: surface position");
+
+ // add sweep for evaluating the symmetry of the fill level field in x-direction
+ const std::shared_ptr< real_t > symmetryNorm = std::make_shared< real_t >(real_c(0));
+ const SymmetryXEvaluator< ScalarField_T > symmetryEvaluator(blockForest, fillFieldID, domainSize,
+ evaluationFrequency, symmetryNorm);
+ timeloop.addFuncAfterTimeStep(symmetryEvaluator, "Evaluator: symmetry norm");
+
+ // add VTK output
+ addVTKOutput< LatticeModel_T, FreeSurfaceBoundaryHandling_T, PdfField_T, FlagField_T, ScalarField_T, VectorField_T >(
+ blockForest, timeloop, walberlaEnv.config(), flagInfo, pdfFieldID, flagFieldID, fillFieldID, forceFieldID,
+ geometryHandler.getCurvatureFieldID(), geometryHandler.getNormalFieldID(),
+ geometryHandler.getObstNormalFieldID());
+
+ // add triangle mesh output of free surface
+ SurfaceMeshWriter< ScalarField_T, FlagField_T > surfaceMeshWriter(
+ blockForest, fillFieldID, flagFieldID, flagIDs::liquidInterfaceGasFlagIDs, real_c(0), walberlaEnv.config());
+ surfaceMeshWriter(); // write initial mesh
+ timeloop.addFuncAfterTimeStep(surfaceMeshWriter, "Writer: surface mesh");
+
+ // add logging for computational performance
+ const lbm::PerformanceLogger< FlagField_T > performanceLogger(
+ blockForest, flagFieldID, flagIDs::liquidInterfaceFlagIDs, performanceLogFrequency);
+ timeloop.addFuncAfterTimeStep(performanceLogger, "Evaluator: performance logging");
+
+ WcTimingPool timingPool;
+
+ for (uint_t t = uint_c(0); t != timesteps; ++t)
+ {
+ timeloop.singleStep(timingPool, true);
+
+ WALBERLA_ROOT_SECTION()
+ {
+ // non-dimensionalize time and surface position
+ const real_t tNonDimensional = real_c(t) * waveFrequency;
+ const real_t positionNonDimensional = (*surfaceYPosition - liquidDepth) / initialAmplitude;
+
+ const std::vector< real_t > resultVector{ tNonDimensional, positionNonDimensional, *symmetryNorm };
+ if (t % evaluationFrequency == uint_c(0))
+ {
+ WALBERLA_LOG_DEVEL("time step = " << t);
+ WALBERLA_LOG_DEVEL("\t\ttNonDimensional = " << tNonDimensional
+ << "\n\t\tpositionNonDimensional = " << positionNonDimensional
+ << "\n\t\tsymmetryNorm = " << *symmetryNorm);
+ writeVectorToFile(resultVector, filename);
+ }
+ }
+
+ if (t % performanceLogFrequency == uint_c(0) && t > uint_c(0)) { timingPool.logResultOnRoot(); }
+ }
+
+ return EXIT_SUCCESS;
+}
+
+template< typename T >
+void writeVectorToFile(const std::vector< T >& vector, const std::string& filename)
+{
+ std::fstream file;
+ file.open(filename, std::fstream::app);
+
+ for (const auto i : vector)
+ {
+ file << "\t" << i;
+ }
+
+ file << "\n";
+ file.close();
+}
+
+} // namespace GravityWaveCodegen
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::GravityWaveCodegen::main(argc, argv); }
\ No newline at end of file
diff --git a/apps/showcases/FreeSurface/GravityWaveLatticeModelGeneration.py b/apps/showcases/FreeSurface/GravityWaveLatticeModelGeneration.py
new file mode 100644
index 0000000000000000000000000000000000000000..22f474fcfbc9011c21311c48a77b097f69f51410
--- /dev/null
+++ b/apps/showcases/FreeSurface/GravityWaveLatticeModelGeneration.py
@@ -0,0 +1,34 @@
+import sympy as sp
+
+from lbmpy.creationfunctions import LBMConfig, LBMOptimisation, create_lb_collision_rule
+from lbmpy.enums import ForceModel, Method, Stencil
+from lbmpy.stencils import LBStencil
+
+from pystencils_walberla import CodeGeneration
+from lbmpy_walberla import generate_lattice_model
+
+# general parameters
+stencil = LBStencil(Stencil.D3Q19)
+omega = sp.Symbol('omega')
+force = sp.symbols('force_:3')
+layout = 'fzyx'
+
+# method definition
+lbm_config = LBMConfig(stencil=stencil,
+ method=Method.SRT,
+ relaxation_rate=omega,
+ compressible=True,
+ force=force,
+ force_model=ForceModel.GUO,
+ zero_centered=False,
+ streaming_pattern='pull') # free surface implementation only works with pull pattern
+
+# optimizations to be used by the code generator
+lbm_opt = LBMOptimisation(cse_global=True,
+ field_layout=layout)
+
+collision_rule = create_lb_collision_rule(lbm_config=lbm_config,
+ lbm_optimisation=lbm_opt)
+
+with CodeGeneration() as ctx:
+ generate_lattice_model(ctx, "GravityWaveLatticeModel", collision_rule, field_layout=layout)
diff --git a/apps/showcases/FreeSurface/MovingDrop.cpp b/apps/showcases/FreeSurface/MovingDrop.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..478ee193c7ba3c70bb6f9eb8e3b91ae9ce2b307e
--- /dev/null
+++ b/apps/showcases/FreeSurface/MovingDrop.cpp
@@ -0,0 +1,325 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file MovingDrop.cpp
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief This showcase simulates a moving drop through a periodic domain.
+//
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+
+#include "lbm/PerformanceLogger.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface/LoadBalancing.h"
+#include "lbm/free_surface/SurfaceMeshWriter.h"
+#include "lbm/free_surface/VtkWriter.h"
+#include "lbm/free_surface/bubble_model/Geometry.h"
+#include "lbm/free_surface/dynamics/SurfaceDynamicsHandler.h"
+#include "lbm/free_surface/surface_geometry/SurfaceGeometryHandler.h"
+#include "lbm/free_surface/surface_geometry/Utility.h"
+#include "lbm/lattice_model/D3Q19.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace DropInPool
+{
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+
+using CollisionModel_T = lbm::collision_model::SRT;
+using ForceModel_T = lbm::force_model::GuoField< VectorField_T >;
+using LatticeModel_T = lbm::D3Q19< CollisionModel_T, true, ForceModel_T, 2 >;
+using LatticeModelStencil_T = LatticeModel_T::Stencil;
+using PdfField_T = lbm::PdfField< LatticeModel_T >;
+using PdfCommunication_T = blockforest::SimpleCommunication< LatticeModelStencil_T >;
+
+// the geometry computations in SurfaceGeometryHandler require meaningful values in the ghost layers in corner
+// directions (flag field and fill level field); this holds, even if the lattice model uses a D3Q19 stencil
+using CommunicationStencil_T =
+ typename std::conditional< LatticeModel_T::Stencil::D == uint_t(2), stencil::D2Q9, stencil::D3Q27 >::type;
+using Communication_T = blockforest::SimpleCommunication< CommunicationStencil_T >;
+
+using flag_t = uint32_t;
+using FlagField_T = FlagField< flag_t >;
+using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+int main(int argc, char** argv)
+{
+ Environment walberlaEnv(argc, argv);
+
+ if (argc < 2) { WALBERLA_ABORT("Please specify a parameter file as input argument.") }
+
+ // print content of parameter file
+ WALBERLA_LOG_INFO_ON_ROOT(*walberlaEnv.config());
+
+ // get block forest parameters from parameter file
+ auto blockForestParameters = walberlaEnv.config()->getOneBlock("BlockForestParameters");
+ const Vector3< uint_t > cellsPerBlock = blockForestParameters.getParameter< Vector3< uint_t > >("cellsPerBlock");
+ const Vector3< bool > periodicity = blockForestParameters.getParameter< Vector3< bool > >("periodicity");
+ const uint_t loadBalancingFrequency = blockForestParameters.getParameter< uint_t >("loadBalancingFrequency");
+ const bool printLoadBalancingStatistics = blockForestParameters.getParameter< bool >("printLoadBalancingStatistics");
+
+ // read domain parameters from parameter file
+ const auto domainParameters = walberlaEnv.config()->getOneBlock("DomainParameters");
+ const real_t dropDiameter = domainParameters.getParameter< real_t >("dropDiameter");
+ const Vector3< real_t > dropCenterFactor = domainParameters.getParameter< Vector3< real_t > >("dropCenterFactor");
+ const Vector3< real_t > domainSizeFactor = domainParameters.getParameter< Vector3< real_t > >("domainSizeFactor");
+
+ // define domain size
+ Vector3< uint_t > domainSize = domainSizeFactor * dropDiameter;
+ domainSize[0] = uint_c(domainSizeFactor[0] * dropDiameter);
+ domainSize[1] = uint_c(domainSizeFactor[1] * dropDiameter);
+ domainSize[2] = uint_c(domainSizeFactor[2] * dropDiameter);
+
+ // compute number of blocks as defined by domainSize and cellsPerBlock
+ Vector3< uint_t > numBlocks;
+ numBlocks[0] = uint_c(std::ceil(real_c(domainSize[0]) / real_c(cellsPerBlock[0])));
+ numBlocks[1] = uint_c(std::ceil(real_c(domainSize[1]) / real_c(cellsPerBlock[1])));
+ numBlocks[2] = uint_c(std::ceil(real_c(domainSize[2]) / real_c(cellsPerBlock[2])));
+
+ // get number of (MPI) processes
+ uint_t numProcesses = uint_c(MPIManager::instance()->numProcesses());
+ WALBERLA_CHECK_LESS_EQUAL(numProcesses, numBlocks[0] * numBlocks[1] * numBlocks[2],
+ "The number of MPI processes is greater than the number of blocks as defined by "
+ "\"domainSize/cellsPerBlock\". This would result in unused MPI processes. Either decrease "
+ "the number of MPI processes or increase \"cellsPerBlock\".")
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(numProcesses);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellsPerBlock);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(numBlocks);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(dropDiameter);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(dropCenterFactor);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(domainSizeFactor);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(periodicity);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(domainSize);
+
+ Vector3< uint_t > realDomainSize;
+ realDomainSize[0] = cellsPerBlock[0] * numBlocks[0];
+ realDomainSize[1] = cellsPerBlock[1] * numBlocks[1];
+ realDomainSize[2] = cellsPerBlock[2] * numBlocks[2];
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(realDomainSize);
+
+ if (domainSize[0] != realDomainSize[0] && periodicity[0])
+ {
+ WALBERLA_ABORT(
+ "The specified domain size in x-direction can not be obtained with the number of blocks you specified.")
+ }
+ if (domainSize[1] != realDomainSize[1] && periodicity[1])
+ {
+ WALBERLA_ABORT(
+ "The specified domain size in y-direction can not be obtained with the number of blocks you specified.")
+ }
+ if (domainSize[2] != realDomainSize[2] && periodicity[2])
+ {
+ WALBERLA_ABORT(
+ "The specified domain size in z-direction can not be obtained with the number of blocks you specified.")
+ }
+
+ // read physics parameters from parameter file
+ const auto physicsParameters = walberlaEnv.config()->getOneBlock("PhysicsParameters");
+ const real_t weberNumber = physicsParameters.getParameter< real_t >("weberNumber");
+ const real_t ohnesorgeNumber = physicsParameters.getParameter< real_t >("ohnesorgeNumber");
+ const real_t relaxationRate = physicsParameters.getParameter< real_t >("relaxationRate");
+
+ const CollisionModel_T collisionModel = CollisionModel_T(relaxationRate);
+ const real_t viscosity = collisionModel.viscosity();
+
+ const real_t surfaceTension = real_c(std::pow(viscosity / ohnesorgeNumber, 2)) / dropDiameter;
+ const real_t initialVelocityX = real_c(std::pow(weberNumber * surfaceTension / dropDiameter, 0.5));
+
+ const Vector3< real_t > force(real_c(0));
+
+ const Vector3< real_t > initialVelocity(initialVelocityX, real_c(0), real_c(0));
+
+ const bool enableWetting = physicsParameters.getParameter< bool >("enableWetting");
+ const real_t contactAngle = physicsParameters.getParameter< real_t >("contactAngle");
+
+ const uint_t timesteps = physicsParameters.getParameter< uint_t >("timesteps");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(relaxationRate);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(surfaceTension);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(force);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(initialVelocity);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableWetting);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(contactAngle);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(timesteps);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(viscosity);
+
+ // read model parameters from parameter file
+ const auto modelParameters = walberlaEnv.config()->getOneBlock("ModelParameters");
+ const std::string pdfReconstructionModel = modelParameters.getParameter< std::string >("pdfReconstructionModel");
+ const std::string pdfRefillingModel = modelParameters.getParameter< std::string >("pdfRefillingModel");
+ const std::string excessMassDistributionModel =
+ modelParameters.getParameter< std::string >("excessMassDistributionModel");
+ const std::string curvatureModel = modelParameters.getParameter< std::string >("curvatureModel");
+ const bool enableForceWeighting = modelParameters.getParameter< bool >("enableForceWeighting");
+ const bool useSimpleMassExchange = modelParameters.getParameter< bool >("useSimpleMassExchange");
+ const bool enableBubbleModel = modelParameters.getParameter< bool >("enableBubbleModel");
+ const bool enableBubbleSplits = modelParameters.getParameter< bool >("enableBubbleSplits");
+ const real_t cellConversionThreshold = modelParameters.getParameter< real_t >("cellConversionThreshold");
+ const real_t cellConversionForceThreshold = modelParameters.getParameter< real_t >("cellConversionForceThreshold");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(pdfReconstructionModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(pdfRefillingModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(excessMassDistributionModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(curvatureModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableForceWeighting);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(useSimpleMassExchange);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableBubbleModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableBubbleSplits);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellConversionThreshold);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellConversionForceThreshold);
+
+ // read evaluation parameters from parameter file
+ const auto evaluationParameters = walberlaEnv.config()->getOneBlock("EvaluationParameters");
+ const uint_t performanceLogFrequency = evaluationParameters.getParameter< uint_t >("performanceLogFrequency");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(performanceLogFrequency);
+
+ // create non-uniform block forest (non-uniformity required for load balancing)
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ createNonUniformBlockForest(domainSize, cellsPerBlock, numBlocks, periodicity);
+
+ // add force field
+ const BlockDataID forceFieldID =
+ field::addToStorage< VectorField_T >(blockForest, "Force field", force, field::fzyx, uint_c(1));
+
+ // create lattice model
+ const LatticeModel_T latticeModel = LatticeModel_T(collisionModel, ForceModel_T(forceFieldID));
+
+ // add pdf field
+ const BlockDataID pdfFieldID =
+ lbm::addPdfFieldToStorage(blockForest, "PDF field", latticeModel, initialVelocity, real_c(1), field::fzyx);
+
+ // add fill level field (initialized with 0, i.e., gas everywhere)
+ const BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill level field", real_c(0.0), field::fzyx, uint_c(2));
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ const Vector3< real_t > dropCenter = dropCenterFactor * dropDiameter;
+
+ const geometry::Sphere sphereDrop(dropCenter, dropDiameter * real_c(0.5));
+ bubble_model::addBodyToFillLevelField< geometry::Sphere >(*blockForest, fillFieldID, sphereDrop, false);
+
+ // initialize boundary conditions from config file
+ const auto boundaryParameters = walberlaEnv.config()->getOneBlock("BoundaryParameters");
+ freeSurfaceBoundaryHandling->initFromConfig(boundaryParameters);
+
+ // IMPORTANT REMARK: this must be only called after every solid flag has been set; otherwise, the boundary handling
+ // might not detect solid flags correctly
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+
+ // communication after initialization
+ Communication_T communication(blockForest, flagFieldID, fillFieldID, forceFieldID);
+ communication();
+
+ PdfCommunication_T pdfCommunication(blockForest, pdfFieldID);
+ pdfCommunication();
+
+ // add bubble model
+ std::shared_ptr< bubble_model::BubbleModelBase > bubbleModel = nullptr;
+ if (enableBubbleModel)
+ {
+ const std::shared_ptr< bubble_model::BubbleModel< CommunicationStencil_T > > bubbleModelDerived =
+ std::make_shared< bubble_model::BubbleModel< CommunicationStencil_T > >(blockForest, enableBubbleSplits);
+ bubbleModelDerived->initFromFillLevelField(fillFieldID);
+ bubbleModelDerived->setAtmosphere(
+ Cell(domainSize[0] - uint_c(1), domainSize[1] - uint_c(1), domainSize[2] - uint_c(1)), real_c(1));
+
+ bubbleModel = std::static_pointer_cast< bubble_model::BubbleModelBase >(bubbleModelDerived);
+ }
+ else { bubbleModel = std::make_shared< bubble_model::BubbleModelConstantPressure >(real_c(1)); }
+
+ // set density in non-liquid or non-interface cells to 1 (after initializing with hydrostatic pressure)
+ setDensityInNonFluidCellsToOne< FlagField_T, PdfField_T >(blockForest, flagInfo, flagFieldID, pdfFieldID);
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, timesteps);
+
+ // Laplace pressure = 2 * surface tension * curvature; curvature computation is not necessary with 0 surface tension
+ bool computeCurvature = false;
+ if (!realIsEqual(surfaceTension, real_c(0), real_c(1e-14))) { computeCurvature = true; }
+
+ // add surface geometry handler
+ const SurfaceGeometryHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > geometryHandler(
+ blockForest, freeSurfaceBoundaryHandling, fillFieldID, curvatureModel, computeCurvature, enableWetting,
+ contactAngle);
+
+ const ConstBlockDataID curvatureFieldID = geometryHandler.getConstCurvatureFieldID();
+ const ConstBlockDataID normalFieldID = geometryHandler.getConstNormalFieldID();
+
+ geometryHandler.addSweeps(timeloop);
+
+ // add boundary handling for standard boundaries and free surface boundaries
+ const SurfaceDynamicsHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > dynamicsHandler(
+ blockForest, pdfFieldID, flagFieldID, fillFieldID, forceFieldID, normalFieldID, curvatureFieldID,
+ freeSurfaceBoundaryHandling, bubbleModel, pdfReconstructionModel, pdfRefillingModel, excessMassDistributionModel,
+ relaxationRate, force, surfaceTension, enableForceWeighting, useSimpleMassExchange, cellConversionThreshold,
+ cellConversionForceThreshold);
+
+ dynamicsHandler.addSweeps(timeloop);
+
+ // add load balancing
+ const LoadBalancer< FlagField_T, CommunicationStencil_T, LatticeModelStencil_T > loadBalancer(
+ blockForest, communication, pdfCommunication, bubbleModel, uint_c(50), uint_c(10), uint_c(5),
+ loadBalancingFrequency, printLoadBalancingStatistics);
+ timeloop.addFuncAfterTimeStep(loadBalancer, "Sweep: load balancing");
+
+ // add VTK output
+ addVTKOutput< LatticeModel_T, FreeSurfaceBoundaryHandling_T, PdfField_T, FlagField_T, ScalarField_T, VectorField_T >(
+ blockForest, timeloop, walberlaEnv.config(), flagInfo, pdfFieldID, flagFieldID, fillFieldID, forceFieldID,
+ geometryHandler.getCurvatureFieldID(), geometryHandler.getNormalFieldID(),
+ geometryHandler.getObstNormalFieldID());
+
+ // add triangle mesh output of free surface
+ SurfaceMeshWriter< ScalarField_T, FlagField_T > surfaceMeshWriter(
+ blockForest, fillFieldID, flagFieldID, flagIDs::liquidInterfaceGasFlagIDs, real_c(0), walberlaEnv.config());
+ surfaceMeshWriter(); // write initial mesh
+ timeloop.addFuncAfterTimeStep(surfaceMeshWriter, "Writer: surface mesh");
+
+ // add logging for computational performance
+ const lbm::PerformanceLogger< FlagField_T > perfLogger(blockForest, flagFieldID, flagIDs::liquidInterfaceFlagIDs,
+ performanceLogFrequency);
+ timeloop.addFuncAfterTimeStep(perfLogger, "Evaluator: performance logging");
+
+ WcTimingPool timingPool;
+
+ for (uint_t t = uint_c(0); t != timesteps; ++t)
+ {
+ if (t % uint_c(100) == uint_c(0)) { WALBERLA_LOG_DEVEL_ON_ROOT("Performing timestep=" << t); }
+ timeloop.singleStep(timingPool, true);
+
+ if (t % performanceLogFrequency == uint_c(0) && t > uint_c(0)) { timingPool.logResultOnRoot(); }
+ }
+
+ return EXIT_SUCCESS;
+}
+
+} // namespace DropInPool
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::DropInPool::main(argc, argv); }
\ No newline at end of file
diff --git a/apps/showcases/FreeSurface/MovingDrop.prm b/apps/showcases/FreeSurface/MovingDrop.prm
new file mode 100644
index 0000000000000000000000000000000000000000..184963db1f00e71bb9a3557987d5415a076de5b4
--- /dev/null
+++ b/apps/showcases/FreeSurface/MovingDrop.prm
@@ -0,0 +1,108 @@
+BlockForestParameters
+{
+ cellsPerBlock < 10, 10, 10 >;
+ periodicity < 1, 1, 1 >;
+ loadBalancingFrequency 0;
+ printLoadBalancingStatistics true;
+}
+
+DomainParameters
+{
+ dropDiameter 50;
+ dropCenterFactor < 1, 1, 1 >; // values multiplied with dropDiameter
+ poolHeightFactor 0; // value multiplied with dropDiameter
+ domainSizeFactor < 2, 2, 4 >; // values multiplied with dropDiameter
+}
+
+PhysicsParameters
+{
+ weberNumber 2010;
+ ohnesorgeNumber 0.0384;
+ relaxationRate 1.989;
+ enableWetting false;
+ contactAngle 0; // only used if enableWetting=true
+ timesteps 1000000;
+}
+
+ModelParameters
+{
+ pdfReconstructionModel OnlyMissing;
+ pdfRefillingModel EquilibriumRefilling;
+ excessMassDistributionModel EvenlyAllInterface;
+ curvatureModel FiniteDifferenceMethod;
+ enableForceWeighting false;
+ useSimpleMassExchange false;
+ enableBubbleModel false;
+ enableBubbleSplits false; // only used if enableBubbleModel=true
+ cellConversionThreshold 1e-2;
+ cellConversionForceThreshold 1e-1;
+}
+
+EvaluationParameters
+{
+ performanceLogFrequency 10000;
+}
+
+BoundaryParameters
+{
+ // X
+ //Border { direction W; walldistance -1; NoSlip{} }
+ //Border { direction E; walldistance -1; NoSlip{} }
+
+ // Y
+ //Border { direction N; walldistance -1; NoSlip{} }
+ //Border { direction S; walldistance -1; NoSlip{} }
+
+ // Z
+ //Border { direction T; walldistance -1; NoSlip{} }
+ //Border { direction B; walldistance -1; NoSlip{} }
+}
+
+MeshOutputParameters
+{
+ writeFrequency 10000;
+ baseFolder mesh-out;
+}
+
+VTK
+{
+ fluid_field
+ {
+ writeFrequency 10000;
+ ghostLayers 0;
+ baseFolder vtk-out;
+ samplingResolution 1;
+
+ writers
+ {
+ velocity;
+ density;
+ //pdf;
+ flag;
+ fill_level;
+ force;
+ curvature;
+ normal;
+ obstacle_normal;
+ mapped_flag;
+ }
+
+ inclusion_filters
+ {
+ // only include liquid and interface cells in VTK output
+ //liquidInterfaceFilter;
+ }
+
+ before_functions
+ {
+ //ghost_layer_synchronization; // only needed if writing the ghost layer
+ }
+
+ }
+ domain_decomposition
+ {
+ writeFrequency 0;
+ baseFolder vtk-out;
+ outputDomainDecomposition true;
+ }
+}
\ No newline at end of file
diff --git a/apps/showcases/FreeSurface/RisingBubble.cpp b/apps/showcases/FreeSurface/RisingBubble.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..3dabdf5da79d90ede7a87400c858f8230b9ebe47
--- /dev/null
+++ b/apps/showcases/FreeSurface/RisingBubble.cpp
@@ -0,0 +1,465 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file RisingBubble.cpp
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//
+// This showcase simulates a rising gas bubble in a stationary liquid. Reference experiments are available from
+// Bhaga, Weber (1981), doi:10.1017/S002211208100311X
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/StringUtility.h"
+
+#include "lbm/PerformanceLogger.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface/LoadBalancing.h"
+#include "lbm/free_surface/SurfaceMeshWriter.h"
+#include "lbm/free_surface/TotalMassComputer.h"
+#include "lbm/free_surface/VtkWriter.h"
+#include "lbm/free_surface/bubble_model/Geometry.h"
+#include "lbm/free_surface/dynamics/SurfaceDynamicsHandler.h"
+#include "lbm/free_surface/surface_geometry/SurfaceGeometryHandler.h"
+#include "lbm/free_surface/surface_geometry/Utility.h"
+#include "lbm/lattice_model/D3Q19.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace RisingBubble
+{
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+
+using CollisionModel_T = lbm::collision_model::SRT;
+using ForceModel_T = lbm::force_model::GuoField< VectorField_T >;
+using LatticeModel_T = lbm::D3Q19< CollisionModel_T, true, ForceModel_T, 2 >;
+using LatticeModelStencil_T = LatticeModel_T::Stencil;
+using PdfField_T = lbm::PdfField< LatticeModel_T >;
+using PdfCommunication_T = blockforest::SimpleCommunication< LatticeModelStencil_T >;
+
+// the geometry computations in SurfaceGeometryHandler require meaningful values in the ghost layers in corner
+// directions (flag field and fill level field); this holds, even if the lattice model uses a D3Q19 stencil
+using CommunicationStencil_T =
+ typename std::conditional< LatticeModel_T::Stencil::D == uint_t(2), stencil::D2Q9, stencil::D3Q27 >::type;
+using Communication_T = blockforest::SimpleCommunication< CommunicationStencil_T >;
+
+using flag_t = uint32_t;
+using FlagField_T = FlagField< flag_t >;
+using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+// write each entry in "vector" to line in a file; the first column contains the current timestep; all values are
+// separated by tabs
+template< typename T >
+void writeVectorToFile(const std::vector< T >& vector, uint_t timestep, const std::string& filename);
+
+// IMPORTANT REMARK: this does not work when multiple bubbles are in the system (e.g. after splitting)
+template< typename FreeSurfaceBoundaryHandling_T >
+class CenterOfMassComputer
+{
+ public:
+ CenterOfMassComputer(const std::weak_ptr< const StructuredBlockForest >& blockForest,
+ const std::weak_ptr< const FreeSurfaceBoundaryHandling_T >& freeSurfaceBoundaryHandling,
+ uint_t frequency, const std::shared_ptr< Vector3< real_t > >& centerOfMass)
+ : blockForest_(blockForest), freeSurfaceBoundaryHandling_(freeSurfaceBoundaryHandling),
+ centerOfMass_(centerOfMass), frequency_(frequency), executionCounter_(uint_c(0))
+ {}
+
+ void operator()()
+ {
+ auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ auto freeSurfaceBoundaryHandling = freeSurfaceBoundaryHandling_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(freeSurfaceBoundaryHandling);
+
+ ++executionCounter_;
+
+ // only evaluate in given frequencies
+ if (executionCounter_ % frequency_ != uint_c(0)) { return; }
+
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ *centerOfMass_ = Vector3< real_t >(real_c(0));
+ Cell cellSum = Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0));
+ uint_t cellCount = uint_c(0);
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ const FlagField_T* const flagField = blockIt->template getData< const FlagField_T >(flagFieldID);
+
+ WALBERLA_FOR_ALL_CELLS(flagFieldIt, flagField, {
+ if (flagInfo.isGas(flagFieldIt))
+ {
+ Cell globalCell = flagFieldIt.cell();
+ // transform local cell to global coordinates
+ blockForest->transformBlockLocalToGlobalCell(globalCell, *blockIt);
+ cellSum += globalCell;
+ ++cellCount;
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ mpi::allReduceInplace< uint_t >(cellCount, mpi::SUM);
+ mpi::allReduceInplace< cell_idx_t >(cellSum[0], mpi::SUM);
+ mpi::allReduceInplace< cell_idx_t >(cellSum[1], mpi::SUM);
+ mpi::allReduceInplace< cell_idx_t >(cellSum[2], mpi::SUM);
+
+ (*centerOfMass_)[0] = real_c(cellSum[0]) / real_c(cellCount);
+ (*centerOfMass_)[1] = real_c(cellSum[1]) / real_c(cellCount);
+ (*centerOfMass_)[2] = real_c(cellSum[2]) / real_c(cellCount);
+ }
+
+ private:
+ std::weak_ptr< const StructuredBlockForest > blockForest_;
+ std::weak_ptr< const FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling_;
+ std::shared_ptr< Vector3< real_t > > centerOfMass_;
+
+ uint_t frequency_;
+ uint_t executionCounter_;
+}; // class CenterOfMassComputer
+
+int main(int argc, char** argv)
+{
+ Environment walberlaEnv(argc, argv);
+
+ if (argc < 2) { WALBERLA_ABORT("Please specify a parameter file as input argument.") }
+
+ // print content of parameter file
+ WALBERLA_LOG_INFO_ON_ROOT(*walberlaEnv.config());
+
+ // get block forest parameters from parameter file
+ auto blockForestParameters = walberlaEnv.config()->getOneBlock("BlockForestParameters");
+ const Vector3< uint_t > cellsPerBlock = blockForestParameters.getParameter< Vector3< uint_t > >("cellsPerBlock");
+ const Vector3< bool > periodicity = blockForestParameters.getParameter< Vector3< bool > >("periodicity");
+ const uint_t loadBalancingFrequency = blockForestParameters.getParameter< uint_t >("loadBalancingFrequency");
+ const bool printLoadBalancingStatistics = blockForestParameters.getParameter< bool >("printLoadBalancingStatistics");
+
+ // get domain parameters from parameter file
+ const auto domainParameters = walberlaEnv.config()->getOneBlock("DomainParameters");
+ const uint_t bubbleDiameter = domainParameters.getParameter< uint_t >("bubbleDiameter");
+ const Vector3< real_t > bubblePosition = domainParameters.getParameter< Vector3< real_t > >("bubblePosition");
+ const Vector3< real_t > domainSizeFactor = domainParameters.getParameter< Vector3< real_t > >("domainSizeFactor");
+
+ // define domain size
+ Vector3< uint_t > domainSize;
+ domainSize[0] = uint_c(domainSizeFactor[0] * real_c(bubbleDiameter));
+ domainSize[1] = uint_c(domainSizeFactor[1] * real_c(bubbleDiameter));
+ domainSize[2] = uint_c(domainSizeFactor[2] * real_c(bubbleDiameter));
+
+ // compute number of blocks as defined by domainSize and cellsPerBlock
+ Vector3< uint_t > numBlocks;
+ numBlocks[0] = uint_c(std::ceil(real_c(domainSize[0]) / real_c(cellsPerBlock[0])));
+ numBlocks[1] = uint_c(std::ceil(real_c(domainSize[1]) / real_c(cellsPerBlock[1])));
+ numBlocks[2] = uint_c(std::ceil(real_c(domainSize[2]) / real_c(cellsPerBlock[2])));
+
+ // get number of (MPI) processes
+ uint_t numProcesses = uint_c(MPIManager::instance()->numProcesses());
+ WALBERLA_CHECK_LESS_EQUAL(numProcesses, numBlocks[0] * numBlocks[1] * numBlocks[2],
+ "The number of MPI processes is greater than the number of blocks as defined by "
+ "\"domainSize/cellsPerBlock\". This would result in unused MPI processes. Either decrease "
+ "the number of MPI processes or increase \"cellsPerBlock\".")
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(numProcesses);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellsPerBlock);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(numBlocks);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(bubbleDiameter);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(bubblePosition);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(domainSizeFactor);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(periodicity);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(domainSize);
+
+ Vector3< uint_t > realDomainSize;
+ realDomainSize[0] = cellsPerBlock[0] * numBlocks[0];
+ realDomainSize[1] = cellsPerBlock[1] * numBlocks[1];
+ realDomainSize[2] = cellsPerBlock[2] * numBlocks[2];
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(realDomainSize);
+
+ if (domainSize[0] != realDomainSize[0] && periodicity[0])
+ {
+ WALBERLA_ABORT(
+ "The specified domain size in x-direction can not be obtained with the numer of blocks you specified.")
+ }
+ if (domainSize[1] != realDomainSize[1] && periodicity[1])
+ {
+ WALBERLA_ABORT(
+ "The specified domain size in y-direction can not be obtained with the numer of blocks you specified.")
+ }
+ // the z-direction must be no slip in this setup and is simply extended (see below) to obtain the specified size
+ int boundaryThicknessZ = int_c(realDomainSize[2]) - int_c(domainSize[2]);
+ if (boundaryThicknessZ < 0)
+ {
+ WALBERLA_ABORT("Something went wrong: the resulting domain size in z-direction is less than specified.")
+ }
+
+ // read physics parameters from parameter file
+ const auto physicsParameters = walberlaEnv.config()->getOneBlock("PhysicsParameters");
+ const real_t bondNumber = physicsParameters.getParameter< real_t >("bondNumber");
+ const real_t mortonNumber = physicsParameters.getParameter< real_t >("mortonNumber");
+ const real_t relaxationRate = physicsParameters.getParameter< real_t >("relaxationRate");
+ const bool enableWetting = physicsParameters.getParameter< bool >("enableWetting");
+ const real_t contactAngle = physicsParameters.getParameter< real_t >("contactAngle");
+ const uint_t timesteps = physicsParameters.getParameter< uint_t >("timesteps");
+
+ const CollisionModel_T collisionModel = CollisionModel_T(relaxationRate);
+ const real_t viscosity = collisionModel.viscosity();
+
+ const real_t surfaceTension = real_c(
+ std::pow(bondNumber * std::pow(viscosity, 4) / mortonNumber / real_c(bubbleDiameter * bubbleDiameter), 0.5));
+
+ const real_t gravitationalAccelerationZ =
+ mortonNumber * real_c(std::pow(surfaceTension, 3)) / real_c(std::pow(viscosity, 4));
+
+ const Vector3< real_t > force(real_c(0), real_c(0), -gravitationalAccelerationZ);
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(relaxationRate);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(mortonNumber);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(bondNumber);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableWetting);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(contactAngle);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(timesteps);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(viscosity);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(force);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(surfaceTension);
+
+ // read model parameters from parameter file
+ const auto modelParameters = walberlaEnv.config()->getOneBlock("ModelParameters");
+ const std::string pdfReconstructionModel = modelParameters.getParameter< std::string >("pdfReconstructionModel");
+ const std::string pdfRefillingModel = modelParameters.getParameter< std::string >("pdfRefillingModel");
+ const std::string excessMassDistributionModel =
+ modelParameters.getParameter< std::string >("excessMassDistributionModel");
+ const std::string curvatureModel = modelParameters.getParameter< std::string >("curvatureModel");
+ const bool enableForceWeighting = modelParameters.getParameter< bool >("enableForceWeighting");
+ const bool useSimpleMassExchange = modelParameters.getParameter< bool >("useSimpleMassExchange");
+ const real_t cellConversionThreshold = modelParameters.getParameter< real_t >("cellConversionThreshold");
+ const real_t cellConversionForceThreshold = modelParameters.getParameter< real_t >("cellConversionForceThreshold");
+ const bool enableBubbleModel = modelParameters.getParameter< bool >("enableBubbleModel");
+ const bool enableBubbleSplits = modelParameters.getParameter< bool >("enableBubbleSplits");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(pdfReconstructionModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(pdfRefillingModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(excessMassDistributionModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(curvatureModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableForceWeighting);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(useSimpleMassExchange);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellConversionThreshold);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellConversionForceThreshold);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableBubbleModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableBubbleSplits);
+
+ // read evaluation parameters from parameter file
+ const auto evaluationParameters = walberlaEnv.config()->getOneBlock("EvaluationParameters");
+ const uint_t performanceLogFrequency = evaluationParameters.getParameter< uint_t >("performanceLogFrequency");
+ const uint_t evaluationFrequency = evaluationParameters.getParameter< uint_t >("evaluationFrequency");
+ const std::string filename = evaluationParameters.getParameter< std::string >("filename");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(performanceLogFrequency);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(evaluationFrequency);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(filename);
+
+ // create non-uniform block forest (non-uniformity required for load balancing)
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ createNonUniformBlockForest(domainSize, cellsPerBlock, numBlocks, periodicity);
+
+ // add force field
+ const BlockDataID forceFieldID =
+ field::addToStorage< VectorField_T >(blockForest, "Force field", force, field::fzyx, uint_c(1));
+
+ // create lattice model
+ const LatticeModel_T latticeModel = LatticeModel_T(collisionModel, ForceModel_T(forceFieldID));
+
+ // add various fields
+ const BlockDataID pdfFieldID = lbm::addPdfFieldToStorage(blockForest, "PDF field", latticeModel, field::fzyx);
+ const BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill level field", real_c(1.0), field::fzyx, uint_c(2));
+
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ const geometry::Sphere sphereBubble(Vector3< real_t >(bubblePosition[0] * real_c(bubbleDiameter),
+ bubblePosition[1] * real_c(bubbleDiameter),
+ bubblePosition[2] * real_c(bubbleDiameter)),
+ real_c(bubbleDiameter) * real_c(0.5));
+ bubble_model::addBodyToFillLevelField< geometry::Sphere >(*blockForest, fillFieldID, sphereBubble, true);
+
+ // add boundary conditions from config file
+ const auto boundaryParameters = walberlaEnv.config()->getOneBlock("BoundaryParameters");
+ freeSurfaceBoundaryHandling->initFromConfig(boundaryParameters);
+ for (int i = -1; i != boundaryThicknessZ; ++i)
+ {
+ freeSurfaceBoundaryHandling->setNoSlipAtBorder(stencil::T, cell_idx_c(i));
+ }
+
+ // IMPORTANT REMARK: this must be only called after every solid flag has been set; otherwise, the boundary handling
+ // might not detect solid flags correctly
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+
+ // communication after initialization
+ Communication_T communication(blockForest, flagFieldID, fillFieldID, forceFieldID);
+ communication();
+
+ PdfCommunication_T pdfCommunication(blockForest, pdfFieldID);
+ pdfCommunication();
+
+ // add bubble model
+ std::shared_ptr< bubble_model::BubbleModelBase > bubbleModel = nullptr;
+ if (enableBubbleModel)
+ {
+ const std::shared_ptr< bubble_model::BubbleModel< CommunicationStencil_T > > bubbleModelDerived =
+ std::make_shared< bubble_model::BubbleModel< CommunicationStencil_T > >(blockForest, enableBubbleSplits);
+ bubbleModelDerived->initFromFillLevelField(fillFieldID);
+
+ bubbleModel = std::static_pointer_cast< bubble_model::BubbleModelBase >(bubbleModelDerived);
+ }
+ else { bubbleModel = std::make_shared< bubble_model::BubbleModelConstantPressure >(real_c(1)); }
+
+ // initialize hydrostatic pressure
+ initHydrostaticPressure< PdfField_T >(blockForest, pdfFieldID, force, real_c(domainSize[2]) * real_c(0.5));
+
+ // set density in non-liquid or non-interface cells to 1 (to be done after initializing with hydrostatic pressure)
+ setDensityInNonFluidCellsToOne< FlagField_T, PdfField_T >(blockForest, flagInfo, flagFieldID, pdfFieldID);
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, timesteps);
+
+ // Laplace pressure = 2 * surface tension * curvature; curvature computation is not necessary with 0 surface tension
+ bool computeCurvature = false;
+ if (!realIsEqual(surfaceTension, real_c(0), real_c(1e-14))) { computeCurvature = true; }
+
+ // add surface geometry handler
+ const SurfaceGeometryHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > geometryHandler(
+ blockForest, freeSurfaceBoundaryHandling, fillFieldID, curvatureModel, computeCurvature, enableWetting,
+ contactAngle);
+
+ geometryHandler.addSweeps(timeloop);
+
+ const ConstBlockDataID curvatureFieldID = geometryHandler.getConstCurvatureFieldID();
+ const ConstBlockDataID normalFieldID = geometryHandler.getConstNormalFieldID();
+
+ // add boundary handling for standard boundaries and free surface boundaries
+ const SurfaceDynamicsHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > dynamicsHandler(
+ blockForest, pdfFieldID, flagFieldID, fillFieldID, forceFieldID, normalFieldID, curvatureFieldID,
+ freeSurfaceBoundaryHandling, bubbleModel, pdfReconstructionModel, pdfRefillingModel, excessMassDistributionModel,
+ relaxationRate, force, surfaceTension, enableForceWeighting, useSimpleMassExchange, cellConversionThreshold,
+ cellConversionForceThreshold);
+
+ dynamicsHandler.addSweeps(timeloop);
+
+ // add load balancing
+ const LoadBalancer< FlagField_T, CommunicationStencil_T, LatticeModelStencil_T > loadBalancer(
+ blockForest, communication, pdfCommunication, bubbleModel, uint_c(50), uint_c(10), uint_c(5),
+ loadBalancingFrequency, printLoadBalancingStatistics);
+ timeloop.addFuncAfterTimeStep(loadBalancer, "Sweep: load balancing");
+
+ // get bubble's center of mass position
+ const std::shared_ptr< Vector3< real_t > > centerOfMass =
+ std::make_shared< Vector3< real_t > >(Vector3< real_t >(real_c(0)));
+ const CenterOfMassComputer< FreeSurfaceBoundaryHandling_T > centerOfMassComputer(
+ blockForest, freeSurfaceBoundaryHandling, evaluationFrequency, centerOfMass);
+ timeloop.addFuncAfterTimeStep(centerOfMassComputer, "Evaluator: center of mass");
+
+ // add computation of total mass
+ const std::shared_ptr< real_t > totalMass = std::make_shared< real_t >(real_c(0));
+ const TotalMassComputer< FreeSurfaceBoundaryHandling_T, PdfField_T, FlagField_T, ScalarField_T > totalMassComputer(
+ blockForest, freeSurfaceBoundaryHandling, pdfFieldID, fillFieldID, evaluationFrequency, totalMass);
+ timeloop.addFuncAfterTimeStep(totalMassComputer, "Evaluator: total mass");
+
+ // add VTK output
+ addVTKOutput< LatticeModel_T, FreeSurfaceBoundaryHandling_T, PdfField_T, FlagField_T, ScalarField_T, VectorField_T >(
+ blockForest, timeloop, walberlaEnv.config(), flagInfo, pdfFieldID, flagFieldID, fillFieldID, forceFieldID,
+ geometryHandler.getCurvatureFieldID(), geometryHandler.getNormalFieldID(),
+ geometryHandler.getObstNormalFieldID());
+
+ // add triangle mesh output of free surface
+ SurfaceMeshWriter< ScalarField_T, FlagField_T > surfaceMeshWriter(
+ blockForest, fillFieldID, flagFieldID, flagIDs::liquidInterfaceGasFlagIDs, real_c(1), walberlaEnv.config());
+ surfaceMeshWriter(); // write initial mesh
+ timeloop.addFuncAfterTimeStep(surfaceMeshWriter, "Writer: surface mesh");
+
+ // add performance logging
+ const lbm::PerformanceLogger< FlagField_T > perfLogger(blockForest, flagFieldID, flagIDs::liquidInterfaceFlagIDs,
+ performanceLogFrequency);
+ timeloop.addFuncAfterTimeStep(perfLogger, "Evaluator: performance logging");
+
+ WcTimingPool timingPool;
+
+ const real_t stoppingHeight = real_c(domainSize[2] - bubbleDiameter);
+
+ uint_t timestepOld = uint_c(0);
+ Vector3< real_t > centerOfMassOld = Vector3< real_t >(real_c(0));
+
+ for (uint_t t = uint_c(0); t != timesteps; ++t)
+ {
+ timeloop.singleStep(timingPool, true);
+
+ // only evaluate if center of mass has moved "significantly"
+ if ((*centerOfMass)[2] > (centerOfMassOld[2] + real_c(1)) && t > uint_c(0))
+ {
+ WALBERLA_ROOT_SECTION()
+ {
+ real_t riseVelocity = ((*centerOfMass)[2] - centerOfMassOld[2]) / real_c(t - timestepOld);
+ const real_t dragForce = real_c(4) / real_c(3) * gravitationalAccelerationZ * real_c(bubbleDiameter) /
+ (riseVelocity * riseVelocity);
+
+ WALBERLA_LOG_DEVEL("time step = " << t);
+ WALBERLA_LOG_DEVEL("\t\tcenterOfMass = " << *centerOfMass << "\n\t\triseVelocity = " << riseVelocity
+ << "\n\t\tdragForce = " << dragForce);
+ WALBERLA_LOG_DEVEL("\t\ttotalMass = " << *totalMass);
+
+ const std::vector< real_t > resultVector{ (*centerOfMass)[2], riseVelocity, dragForce };
+
+ writeVectorToFile(resultVector, t, filename);
+ }
+
+ timestepOld = t;
+ centerOfMassOld = *centerOfMass;
+ }
+
+ // stop simulation before bubble hits the top wall
+ if ((*centerOfMass)[2] > stoppingHeight) { break; }
+
+ if (t % performanceLogFrequency == uint_c(0) && t > uint_c(0)) { timingPool.logResultOnRoot(); }
+ }
+ return EXIT_SUCCESS;
+}
+
+template< typename T >
+void writeVectorToFile(const std::vector< T >& vector, uint_t timestep, const std::string& filename)
+{
+ std::fstream file;
+ file.open(filename, std::fstream::app);
+
+ file << timestep;
+ for (const auto i : vector)
+ {
+ file << "\t" << i;
+ }
+
+ file << "\n";
+ file.close();
+}
+
+} // namespace RisingBubble
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::RisingBubble::main(argc, argv); }
\ No newline at end of file
diff --git a/apps/showcases/FreeSurface/RisingBubble.prm b/apps/showcases/FreeSurface/RisingBubble.prm
new file mode 100644
index 0000000000000000000000000000000000000000..5d483426beb659bfe93db4ee94fe595e29c67255
--- /dev/null
+++ b/apps/showcases/FreeSurface/RisingBubble.prm
@@ -0,0 +1,108 @@
+BlockForestParameters
+{
+ cellsPerBlock < 16, 16, 16 >;
+ periodicity < 1, 1, 0 >;
+ loadBalancingFrequency 445;
+ printLoadBalancingStatistics true;
+}
+
+DomainParameters
+{
+ bubbleDiameter 16;
+ bubblePosition < 4, 4, 1 >; // initial bubble position (values multiplied with bubbleDiameter)
+ domainSizeFactor < 8, 8, 20 >; // values multiplied with bubbleDiameter
+}
+
+PhysicsParameters
+{
+ bondNumber 115;
+ mortonNumber 4.63e-3;
+ relaxationRate 1.95;
+ enableWetting false;
+ contactAngle 0; // only used if enableWetting=true
+ timesteps 8900;
+}
+
+ModelParameters
+{
+ pdfReconstructionModel OnlyMissing;
+ pdfRefillingModel EquilibriumRefilling;
+ excessMassDistributionModel EvenlyAllInterface;
+ curvatureModel FiniteDifferenceMethod;
+ enableForceWeighting false;
+ useSimpleMassExchange false;
+ cellConversionThreshold 1e-2;
+ cellConversionForceThreshold 1e-1;
+
+ enableBubbleModel true;
+ enableBubbleSplits false; // only used if enableBubbleModel=true
+}
+
+EvaluationParameters
+{
+ performanceLogFrequency 4450;
+ evaluationFrequency 44;
+ filename rising-bubble.txt;
+}
+
+BoundaryParameters
+{
+ // X
+ //Border { direction W; walldistance -1; NoSlip{} }
+ //Border { direction E; walldistance -1; NoSlip{} }
+
+ // Y
+ //Border { direction N; walldistance -1; NoSlip{} }
+ //Border { direction S; walldistance -1; NoSlip{} }
+
+ // Z
+ Border { direction T; walldistance -1; NoSlip{} }
+ Border { direction B; walldistance -1; NoSlip{} }
+}
+
+MeshOutputParameters
+{
+ writeFrequency 445;
+ baseFolder mesh-out;
+}
+
+VTK
+{
+ fluid_field
+ {
+ writeFrequency 445;
+ ghostLayers 0;
+ baseFolder vtk-out;
+ samplingResolution 1;
+
+ writers
+ {
+ fill_level;
+ mapped_flag;
+ velocity;
+ density;
+ //curvature;
+ //normal;
+ //obstacle_normal;
+ //pdf;
+ //flag;
+ //force;
+ }
+
+ inclusion_filters
+ {
+ //liquidInterfaceFilter; // only include liquid and interface cells in VTK output
+ }
+
+ before_functions
+ {
+ //ghost_layer_synchronization; // only needed if writing the ghost layer
+ }
+ }
+ domain_decomposition
+ {
+ writeFrequency 445;
+ baseFolder vtk-out;
+ outputDomainDecomposition true;
+ }
+}
\ No newline at end of file
diff --git a/apps/showcases/FreeSurface/TaylorBubble.cpp b/apps/showcases/FreeSurface/TaylorBubble.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..f32cfb982e282ee8bb57d8a8ce10b48e4e426792
--- /dev/null
+++ b/apps/showcases/FreeSurface/TaylorBubble.cpp
@@ -0,0 +1,494 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file TaylorBubble.cpp
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief This showcase simulates a rising gas bubble in a cylindrical tube.
+//
+// This showcase simulates an elongated gas bubble in a cylindrical tube. Reference experiments are available from
+// Bugg, Saad (2002), doi:10.1016/S0301-9322(02)00002-2
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/StringUtility.h"
+
+#include "lbm/PerformanceLogger.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface/LoadBalancing.h"
+#include "lbm/free_surface/SurfaceMeshWriter.h"
+#include "lbm/free_surface/TotalMassComputer.h"
+#include "lbm/free_surface/VtkWriter.h"
+#include "lbm/free_surface/bubble_model/Geometry.h"
+#include "lbm/free_surface/dynamics/SurfaceDynamicsHandler.h"
+#include "lbm/free_surface/surface_geometry/SurfaceGeometryHandler.h"
+#include "lbm/free_surface/surface_geometry/Utility.h"
+#include "lbm/lattice_model/D3Q19.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace TaylorBubble
+{
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+
+using CollisionModel_T = lbm::collision_model::SRT;
+using ForceModel_T = lbm::force_model::GuoField< VectorField_T >;
+using LatticeModel_T = lbm::D3Q19< CollisionModel_T, true, ForceModel_T, 2 >;
+using LatticeModelStencil_T = LatticeModel_T::Stencil;
+using PdfField_T = lbm::PdfField< LatticeModel_T >;
+using PdfCommunication_T = blockforest::SimpleCommunication< LatticeModelStencil_T >;
+
+// the geometry computations in SurfaceGeometryHandler require meaningful values in the ghost layers in corner
+// directions (flag field and fill level field); this holds, even if the lattice model uses a D3Q19 stencil
+using CommunicationStencil_T =
+ typename std::conditional< LatticeModel_T::Stencil::D == uint_t(2), stencil::D2Q9, stencil::D3Q27 >::type;
+using Communication_T = blockforest::SimpleCommunication< CommunicationStencil_T >;
+
+using flag_t = uint32_t;
+using FlagField_T = FlagField< flag_t >;
+using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+// write each entry in "vector" to line in a file; the first column contains the current timestep; all values are
+// separated by tabs
+template< typename T >
+void writeVectorToFile(const std::vector< T >& vector, uint_t timestep, const std::string& filename);
+
+// IMPORTANT REMARK: this does not work when multiple bubbles are in the system (e.g. after splitting)
+template< typename FreeSurfaceBoundaryHandling_T >
+class CenterOfMassComputer
+{
+ public:
+ CenterOfMassComputer(const std::weak_ptr< const StructuredBlockForest >& blockForest,
+ const std::weak_ptr< const FreeSurfaceBoundaryHandling_T >& freeSurfaceBoundaryHandling,
+ uint_t interval, const std::shared_ptr< Vector3< real_t > >& centerOfMass)
+ : blockForest_(blockForest), freeSurfaceBoundaryHandling_(freeSurfaceBoundaryHandling),
+ centerOfMass_(centerOfMass), interval_(interval), executionCounter_(uint_c(0))
+ {}
+
+ void operator()()
+ {
+ auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ auto freeSurfaceBoundaryHandling = freeSurfaceBoundaryHandling_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(freeSurfaceBoundaryHandling);
+
+ ++executionCounter_;
+
+ // only evaluate in given intervals
+ if (executionCounter_ % interval_ != uint_c(0)) { return; }
+
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ *centerOfMass_ = Vector3< real_t >(real_c(0));
+ Cell cellSum = Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0));
+ uint_t cellCount = uint_c(0);
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ const FlagField_T* const flagField = blockIt->template getData< const FlagField_T >(flagFieldID);
+
+ WALBERLA_FOR_ALL_CELLS(flagFieldIt, flagField, {
+ if (flagInfo.isGas(flagFieldIt))
+ {
+ Cell globalCell = flagFieldIt.cell();
+ // transform local cell to global coordinates
+ blockForest->transformBlockLocalToGlobalCell(globalCell, *blockIt);
+ cellSum += globalCell;
+ ++cellCount;
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ mpi::allReduceInplace< uint_t >(cellCount, mpi::SUM);
+ mpi::allReduceInplace< cell_idx_t >(cellSum[0], mpi::SUM);
+ mpi::allReduceInplace< cell_idx_t >(cellSum[1], mpi::SUM);
+ mpi::allReduceInplace< cell_idx_t >(cellSum[2], mpi::SUM);
+
+ (*centerOfMass_)[0] = real_c(cellSum[0]) / real_c(cellCount);
+ (*centerOfMass_)[1] = real_c(cellSum[1]) / real_c(cellCount);
+ (*centerOfMass_)[2] = real_c(cellSum[2]) / real_c(cellCount);
+ }
+
+ private:
+ std::weak_ptr< const StructuredBlockForest > blockForest_;
+ std::weak_ptr< const FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling_;
+ std::shared_ptr< Vector3< real_t > > centerOfMass_;
+
+ uint_t interval_;
+ uint_t executionCounter_;
+}; // class CenterOfMassComputer
+
+int main(int argc, char** argv)
+{
+ Environment walberlaEnv(argc, argv);
+
+ if (argc < 2) { WALBERLA_ABORT("Please specify a parameter file as input argument.") }
+
+ // print content of parameter file
+ WALBERLA_LOG_INFO_ON_ROOT(*walberlaEnv.config());
+
+ // get block forest parameters from parameter file
+ auto blockForestParameters = walberlaEnv.config()->getOneBlock("BlockForestParameters");
+ const Vector3< uint_t > cellsPerBlock = blockForestParameters.getParameter< Vector3< uint_t > >("cellsPerBlock");
+ const Vector3< bool > periodicity = blockForestParameters.getParameter< Vector3< bool > >("periodicity");
+ const uint_t loadBalancingFrequency = blockForestParameters.getParameter< uint_t >("loadBalancingFrequency");
+ const bool printLoadBalancingStatistics = blockForestParameters.getParameter< bool >("printLoadBalancingStatistics");
+
+ // read domain parameters from parameter file
+ const auto domainParameters = walberlaEnv.config()->getOneBlock("DomainParameters");
+ const real_t tubeDiameter = domainParameters.getParameter< real_t >("tubeDiameter");
+ const real_t bubbleDiameter = domainParameters.getParameter< real_t >("bubbleDiameter");
+ const real_t bubbleHeight = domainParameters.getParameter< real_t >("bubbleHeight");
+ const Vector3< real_t > bubbleBottomEnd = domainParameters.getParameter< Vector3< real_t > >("bubbleBottomEnd");
+ const Vector3< real_t > domainSizeFactor = domainParameters.getParameter< Vector3< real_t > >("domainSizeFactor");
+
+ // define domain size
+ Vector3< uint_t > domainSize;
+ domainSize[0] = uint_c(domainSizeFactor[0] * tubeDiameter);
+ domainSize[1] = uint_c(domainSizeFactor[1] * tubeDiameter);
+ domainSize[2] = uint_c(domainSizeFactor[2] * tubeDiameter);
+
+ // compute number of blocks as defined by domainSize and cellsPerBlock
+ Vector3< uint_t > numBlocks;
+ numBlocks[0] = uint_c(std::ceil(real_c(domainSize[0]) / real_c(cellsPerBlock[0])));
+ numBlocks[1] = uint_c(std::ceil(real_c(domainSize[1]) / real_c(cellsPerBlock[1])));
+ numBlocks[2] = uint_c(std::ceil(real_c(domainSize[2]) / real_c(cellsPerBlock[2])));
+
+ // get number of (MPI) processes
+ uint_t numProcesses = uint_c(MPIManager::instance()->numProcesses());
+ WALBERLA_CHECK_LESS_EQUAL(numProcesses, numBlocks[0] * numBlocks[1] * numBlocks[2],
+ "The number of MPI processes is greater than the number of blocks as defined by "
+ "\"domainSize/cellsPerBlock\". This would result in unused MPI processes. Either decrease "
+ "the number of MPI processes or increase \"cellsPerBlock\".")
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(numProcesses);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellsPerBlock);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(numBlocks);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(tubeDiameter);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(bubbleDiameter);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(bubbleHeight);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(bubbleBottomEnd);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(domainSizeFactor);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(periodicity);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(domainSize);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellsPerBlock);
+
+ Vector3< uint_t > realDomainSize;
+ realDomainSize[0] = cellsPerBlock[0] * numBlocks[0];
+ realDomainSize[1] = cellsPerBlock[1] * numBlocks[1];
+ realDomainSize[2] = cellsPerBlock[2] * numBlocks[2];
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(realDomainSize);
+
+ if (domainSize[0] != realDomainSize[0] && periodicity[0])
+ {
+ WALBERLA_ABORT(
+ "The specified domain size in x-direction can not be obtained with the numer of blocks you specified.")
+ }
+ if (domainSize[1] != realDomainSize[1] && periodicity[1])
+ {
+ WALBERLA_ABORT(
+ "The specified domain size in y-direction can not be obtained with the numer of blocks you specified.")
+ }
+ // the z-direction must be no slip in this setup and is simply extended (see below) to obtain the specified size
+ int boundaryThicknessZ = int_c(realDomainSize[2]) - int_c(domainSize[2]);
+ if (boundaryThicknessZ < 0)
+ {
+ WALBERLA_ABORT("Something went wrong: the resulting domain size in z-direction is less than specified.")
+ }
+
+ // read physics parameters from parameter file
+ const auto physicsParameters = walberlaEnv.config()->getOneBlock("PhysicsParameters");
+ const real_t bondNumber = physicsParameters.getParameter< real_t >("bondNumber");
+ const real_t mortonNumber = physicsParameters.getParameter< real_t >("mortonNumber");
+ const real_t relaxationRate = physicsParameters.getParameter< real_t >("relaxationRate");
+ const bool enableWetting = physicsParameters.getParameter< bool >("enableWetting");
+ const real_t contactAngle = physicsParameters.getParameter< real_t >("contactAngle");
+ const uint_t timesteps = physicsParameters.getParameter< uint_t >("timesteps");
+
+ const CollisionModel_T collisionModel = CollisionModel_T(relaxationRate);
+ const real_t viscosity = collisionModel.viscosity();
+
+ const real_t surfaceTension =
+ real_c(std::pow(bondNumber * std::pow(viscosity, 4) / mortonNumber / real_c(tubeDiameter * tubeDiameter), 0.5));
+
+ const real_t gravitationalAccelerationZ =
+ mortonNumber * real_c(std::pow(surfaceTension, 3)) / real_c(std::pow(viscosity, 4));
+
+ const Vector3< real_t > force = Vector3< real_t >(real_c(0), real_c(0), -gravitationalAccelerationZ);
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(relaxationRate);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(mortonNumber);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(bondNumber);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableWetting);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(contactAngle);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(timesteps);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(viscosity);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(force);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(surfaceTension);
+
+ // read model parameters from parameter file
+ const auto modelParameters = walberlaEnv.config()->getOneBlock("ModelParameters");
+ const std::string pdfReconstructionModel = modelParameters.getParameter< std::string >("pdfReconstructionModel");
+ const std::string pdfRefillingModel = modelParameters.getParameter< std::string >("pdfRefillingModel");
+ const std::string excessMassDistributionModel =
+ modelParameters.getParameter< std::string >("excessMassDistributionModel");
+ const std::string curvatureModel = modelParameters.getParameter< std::string >("curvatureModel");
+ const bool enableForceWeighting = modelParameters.getParameter< bool >("enableForceWeighting");
+ const bool useSimpleMassExchange = modelParameters.getParameter< bool >("useSimpleMassExchange");
+ const real_t cellConversionThreshold = modelParameters.getParameter< real_t >("cellConversionThreshold");
+ const real_t cellConversionForceThreshold = modelParameters.getParameter< real_t >("cellConversionForceThreshold");
+ const bool enableBubbleModel = modelParameters.getParameter< bool >("enableBubbleModel");
+ const bool enableBubbleSplits = modelParameters.getParameter< bool >("enableBubbleSplits");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(pdfReconstructionModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(pdfRefillingModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(excessMassDistributionModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(curvatureModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableForceWeighting);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(useSimpleMassExchange);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellConversionThreshold);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(cellConversionForceThreshold);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableBubbleModel);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(enableBubbleSplits);
+
+ // read evaluation parameters from parameter file
+ const auto evaluationParameters = walberlaEnv.config()->getOneBlock("EvaluationParameters");
+ const uint_t performanceLogFrequency = evaluationParameters.getParameter< uint_t >("performanceLogFrequency");
+ const uint_t evaluationFrequency = evaluationParameters.getParameter< uint_t >("evaluationFrequency");
+ const std::string filename = evaluationParameters.getParameter< std::string >("filename");
+
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(performanceLogFrequency);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(evaluationFrequency);
+ WALBERLA_LOG_DEVEL_VAR_ON_ROOT(filename);
+
+ // create non-uniform block forest (non-uniformity required for load balancing)
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ createNonUniformBlockForest(domainSize, cellsPerBlock, numBlocks, periodicity);
+
+ // add force field
+ const BlockDataID forceFieldID =
+ field::addToStorage< VectorField_T >(blockForest, "Force field", force, field::fzyx, uint_c(1));
+
+ // create lattice model
+ const LatticeModel_T latticeModel = LatticeModel_T(collisionModel, ForceModel_T(forceFieldID));
+
+ // add various fields
+ const BlockDataID pdfFieldID = lbm::addPdfFieldToStorage(blockForest, "PDF field", latticeModel, field::fzyx);
+ const BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill level field", real_c(1.0), field::fzyx, uint_c(2));
+
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ const Vector3< real_t > bubbleTopEnd =
+ Vector3< real_t >(bubbleBottomEnd[0], bubbleBottomEnd[1], bubbleBottomEnd[2] + bubbleHeight);
+ const geometry::Cylinder cylinderBubble(bubbleBottomEnd * tubeDiameter, bubbleTopEnd * tubeDiameter,
+ bubbleDiameter * tubeDiameter * real_c(0.5));
+
+ bubble_model::addBodyToFillLevelField< geometry::Cylinder >(*blockForest, fillFieldID, cylinderBubble, true);
+
+ // add boundary conditions from config file
+ const auto boundaryParameters = walberlaEnv.config()->getOneBlock("BoundaryParameters");
+ freeSurfaceBoundaryHandling->initFromConfig(boundaryParameters);
+ for (int i = -1; i != boundaryThicknessZ; ++i)
+ {
+ freeSurfaceBoundaryHandling->setNoSlipAtBorder(stencil::T, cell_idx_c(i));
+ }
+
+ // initialize cylindrical domain walls
+ const Vector3< real_t > domainCylinderBottomEnd =
+ Vector3< real_t >(real_c(domainSize[0]) * real_c(0.5), real_c(domainSize[1]) * real_c(0.5), real_c(0));
+ const Vector3< real_t > domainCylinderTopEnd = Vector3< real_t >(
+ real_c(domainSize[0]) * real_c(0.5), real_c(domainSize[1]) * real_c(0.5), real_c(domainSize[2]));
+ const geometry::Cylinder cylinderTube(domainCylinderBottomEnd, domainCylinderTopEnd, tubeDiameter * real_c(0.5));
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ const FlagField_T* const flagField = blockIt->template getData< const FlagField_T >(flagFieldID);
+
+ WALBERLA_FOR_ALL_CELLS(flagFieldIt, flagField, {
+ Cell globalCell = flagFieldIt.cell();
+ blockForest->transformBlockLocalToGlobalCell(globalCell, *blockIt);
+ const Vector3< real_t > globalPoint = blockForest->getCellCenter(globalCell);
+
+ if (!geometry::contains(cylinderTube, globalPoint))
+ {
+ freeSurfaceBoundaryHandling->setNoSlipInCell(globalCell);
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ // IMPORTANT REMARK: this must be only called after every solid flag has been set; otherwise, the boundary handling
+ // might not detect solid flags correctly
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+
+ // communication after initialization
+ Communication_T communication(blockForest, flagFieldID, fillFieldID, forceFieldID);
+ communication();
+
+ PdfCommunication_T pdfCommunication(blockForest, pdfFieldID);
+ pdfCommunication();
+
+ // add bubble model
+ std::shared_ptr< bubble_model::BubbleModelBase > bubbleModel = nullptr;
+ if (enableBubbleModel)
+ {
+ const std::shared_ptr< bubble_model::BubbleModel< CommunicationStencil_T > > bubbleModelDerived =
+ std::make_shared< bubble_model::BubbleModel< CommunicationStencil_T > >(blockForest, enableBubbleSplits);
+ bubbleModelDerived->initFromFillLevelField(fillFieldID);
+
+ bubbleModel = std::static_pointer_cast< bubble_model::BubbleModelBase >(bubbleModelDerived);
+ }
+ else { bubbleModel = std::make_shared< bubble_model::BubbleModelConstantPressure >(real_c(1)); }
+
+ // initialize hydrostatic pressure
+ initHydrostaticPressure< PdfField_T >(blockForest, pdfFieldID, force, real_c(domainSize[2]) * real_c(0.5));
+
+ // set density in non-liquid or non-interface cells to 1 (after initializing with hydrostatic pressure)
+ setDensityInNonFluidCellsToOne< FlagField_T, PdfField_T >(blockForest, flagInfo, flagFieldID, pdfFieldID);
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, timesteps);
+
+ // Laplace pressure = 2 * surface tension * curvature; curvature computation is not necessary with 0 surface tension
+ bool computeCurvature = false;
+ if (!realIsEqual(surfaceTension, real_c(0), real_c(1e-14))) { computeCurvature = true; }
+
+ // add surface geometry handler
+ const SurfaceGeometryHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > geometryHandler(
+ blockForest, freeSurfaceBoundaryHandling, fillFieldID, curvatureModel, computeCurvature, enableWetting,
+ contactAngle);
+
+ geometryHandler.addSweeps(timeloop);
+
+ const ConstBlockDataID curvatureFieldID = geometryHandler.getConstCurvatureFieldID();
+ const ConstBlockDataID normalFieldID = geometryHandler.getConstNormalFieldID();
+
+ // add boundary handling for standard boundaries and free surface boundaries
+ const SurfaceDynamicsHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > dynamicsHandler(
+ blockForest, pdfFieldID, flagFieldID, fillFieldID, forceFieldID, normalFieldID, curvatureFieldID,
+ freeSurfaceBoundaryHandling, bubbleModel, pdfReconstructionModel, pdfRefillingModel, excessMassDistributionModel,
+ relaxationRate, force, surfaceTension, enableForceWeighting, useSimpleMassExchange, cellConversionThreshold,
+ cellConversionForceThreshold);
+
+ dynamicsHandler.addSweeps(timeloop);
+
+ // add load balancing
+ const LoadBalancer< FlagField_T, CommunicationStencil_T, LatticeModelStencil_T > loadBalancer(
+ blockForest, communication, pdfCommunication, bubbleModel, uint_c(50), uint_c(10), uint_c(5),
+ loadBalancingFrequency, printLoadBalancingStatistics);
+ timeloop.addFuncAfterTimeStep(loadBalancer, "Sweep: load balancing");
+
+ const std::shared_ptr< Vector3< real_t > > centerOfMass =
+ std::make_shared< Vector3< real_t > >(Vector3< real_t >(real_c(0)));
+ const CenterOfMassComputer< FreeSurfaceBoundaryHandling_T > centerOfMassComputer(
+ blockForest, freeSurfaceBoundaryHandling, evaluationFrequency, centerOfMass);
+ timeloop.addFuncAfterTimeStep(centerOfMassComputer, "Evaluator: center of mass");
+
+ const std::shared_ptr< real_t > totalMass = std::make_shared< real_t >(real_c(0));
+ const TotalMassComputer< FreeSurfaceBoundaryHandling_T, PdfField_T, FlagField_T, ScalarField_T > totalMassComputer(
+ blockForest, freeSurfaceBoundaryHandling, pdfFieldID, fillFieldID, evaluationFrequency, totalMass);
+ timeloop.addFuncAfterTimeStep(totalMassComputer, "Evaluator: total mass");
+
+ // add VTK output
+ addVTKOutput< LatticeModel_T, FreeSurfaceBoundaryHandling_T, PdfField_T, FlagField_T, ScalarField_T, VectorField_T >(
+ blockForest, timeloop, walberlaEnv.config(), flagInfo, pdfFieldID, flagFieldID, fillFieldID, forceFieldID,
+ geometryHandler.getCurvatureFieldID(), geometryHandler.getNormalFieldID(),
+ geometryHandler.getObstNormalFieldID());
+
+ // add triangle mesh output of free surface
+ SurfaceMeshWriter< ScalarField_T, FlagField_T > surfaceMeshWriter(
+ blockForest, fillFieldID, flagFieldID, flagIDs::liquidInterfaceGasFlagIDs, real_c(1), walberlaEnv.config());
+ surfaceMeshWriter(); // write initial mesh
+ timeloop.addFuncAfterTimeStep(surfaceMeshWriter, "Writer: surface mesh");
+
+ // add performance logging
+ const lbm::PerformanceLogger< FlagField_T > perfLogger(blockForest, flagFieldID, flagIDs::liquidInterfaceFlagIDs,
+ performanceLogFrequency);
+ timeloop.addFuncAfterTimeStep(perfLogger, "Evaluator: performance logging");
+
+ WcTimingPool timingPool;
+
+ const real_t stoppingHeight = real_c(domainSize[2]) - bubbleHeight * tubeDiameter;
+
+ uint_t timestepOld = uint_c(0);
+ Vector3< real_t > centerOfMassOld = Vector3< real_t >(real_c(0));
+
+ for (uint_t t = uint_c(0); t != timesteps; ++t)
+ {
+ timeloop.singleStep(timingPool, true);
+
+ // only evaluate if center of mass has moved "significantly"
+ if ((*centerOfMass)[2] > (centerOfMassOld[2] + real_c(1)) && t > uint_c(0))
+ {
+ WALBERLA_ROOT_SECTION()
+ {
+ real_t riseVelocity = ((*centerOfMass)[2] - centerOfMassOld[2]) / real_c(t - timestepOld);
+ const real_t dragForce = real_c(4) / real_c(3) * gravitationalAccelerationZ * real_c(bubbleDiameter) /
+ (riseVelocity * riseVelocity);
+
+ WALBERLA_LOG_DEVEL("time step = " << t);
+ WALBERLA_LOG_DEVEL("\t\tcenterOfMass = " << *centerOfMass << "\n\t\triseVelocity = " << riseVelocity
+ << "\n\t\tdragForce = " << dragForce);
+ WALBERLA_LOG_DEVEL("\t\ttotalMass = " << *totalMass);
+
+ const std::vector< real_t > resultVector{ (*centerOfMass)[2], riseVelocity, dragForce };
+
+ writeVectorToFile(resultVector, t, filename);
+ }
+
+ timestepOld = t;
+ centerOfMassOld = *centerOfMass;
+ }
+
+
+ // stop simulation before bubble hits the top wall
+ if ((*centerOfMass)[2] > stoppingHeight) { break; }
+
+ if (t % performanceLogFrequency == uint_c(0) && t > uint_c(0)) { timingPool.logResultOnRoot(); }
+ }
+ return EXIT_SUCCESS;
+}
+
+template< typename T >
+void writeVectorToFile(const std::vector< T >& vector, uint_t timestep, const std::string& filename)
+{
+ std::fstream file;
+ file.open(filename, std::fstream::app);
+
+ file << timestep;
+ for (const auto i : vector)
+ {
+ file << "\t" << i;
+ }
+
+ file << "\n";
+ file.close();
+}
+
+} // namespace TaylorBubble
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::TaylorBubble::main(argc, argv); }
\ No newline at end of file
diff --git a/apps/showcases/FreeSurface/TaylorBubble.prm b/apps/showcases/FreeSurface/TaylorBubble.prm
new file mode 100644
index 0000000000000000000000000000000000000000..a2b289aeeb75b6a9e2c57819602b595c755da687
--- /dev/null
+++ b/apps/showcases/FreeSurface/TaylorBubble.prm
@@ -0,0 +1,110 @@
+BlockForestParameters
+{
+ cellsPerBlock < 16, 16, 20 >;
+ periodicity < 0, 0, 0 >;
+ loadBalancingFrequency 0;
+ printLoadBalancingStatistics false;
+}
+
+DomainParameters
+{
+ tubeDiameter 32;
+ bubbleDiameter 0.75; // value multiplied with tubeDiameter
+ bubbleHeight 3; // value multiplied with tubeDiameter
+ bubbleBottomEnd < 0.5, 0.5, 1 >; // initial cylindrical bubble's bottom end center (values multiplied with tubeDiameter)
+ domainSizeFactor < 1, 1, 10 >; // values multiplied with tubeDiameter
+}
+
+PhysicsParameters
+{
+ bondNumber 100;
+ mortonNumber 0.015;
+ relaxationRate 1.8;
+ enableWetting false;
+ contactAngle 60; // only used if enableWetting=true
+ timesteps 12240;
+}
+
+ModelParameters
+{
+ pdfReconstructionModel OnlyMissing;
+ pdfRefillingModel EquilibriumRefilling;
+ excessMassDistributionModel EvenlyAllInterface;
+ curvatureModel FiniteDifferenceMethod;
+ enableForceWeighting false;
+ useSimpleMassExchange false;
+ cellConversionThreshold 1e-2;
+ cellConversionForceThreshold 1e-1;
+
+ enableBubbleModel true;
+ enableBubbleSplits false; // only used if enableBubbleModel=true
+}
+
+EvaluationParameters
+{
+ performanceLogFrequency 1224;
+ evaluationFrequency 61;
+ filename taylor-bubble.txt;
+}
+
+BoundaryParameters
+{
+ // X
+ Border { direction W; walldistance -1; NoSlip{} }
+ Border { direction E; walldistance -1; NoSlip{} }
+
+ // Y
+ Border { direction N; walldistance -1; NoSlip{} }
+ Border { direction S; walldistance -1; NoSlip{} }
+
+ // Z
+ Border { direction T; walldistance -1; NoSlip{} }
+ Border { direction B; walldistance -1; NoSlip{} }
+}
+
+MeshOutputParameters
+{
+ writeFrequency 612;
+ baseFolder mesh-out;
+}
+
+VTK
+{
+ fluid_field
+ {
+ writeFrequency 612;
+ ghostLayers 0;
+ baseFolder vtk-out;
+ samplingResolution 1;
+
+ writers
+ {
+ fill_level;
+ mapped_flag;
+ velocity;
+ density;
+ curvature;
+ normal;
+ obstacle_normal;
+ //pdf;
+ //flag;
+ //force;
+ }
+
+ inclusion_filters
+ {
+ //liquidInterfaceFilter; // only include liquid and interface cells in VTK output
+ }
+
+ before_functions
+ {
+ //ghost_layer_synchronization; // only needed if writing the ghost layer
+ }
+ }
+ domain_decomposition
+ {
+ writeFrequency 0;
+ baseFolder vtk-out;
+ outputDomainDecomposition true;
+ }
+}
\ No newline at end of file
diff --git a/src/core/StringUtility.h b/src/core/StringUtility.h
index 780cfb9de146f2eb82c9dcee247b6b47d34cd3e8..9ac7590fae38f92b276939cb2e839b4318daaa1d 100644
--- a/src/core/StringUtility.h
+++ b/src/core/StringUtility.h
@@ -30,50 +30,60 @@ namespace walberla
{
// Convert (in place) every character in string to uppercase.
-inline void string_to_upper(std::string &s);
+inline void string_to_upper(std::string& s);
// Convert (copy) every character in string to uppercase.
-inline std::string string_to_upper_copy(const std::string &s);
+inline std::string string_to_upper_copy(const std::string& s);
// Convert (in place) every character in string to lowercase.
-inline void string_to_lower(std::string &s);
+inline void string_to_lower(std::string& s);
// Convert (in place) every character in string to lowercase.
-inline std::string string_to_lower_copy(const std::string &s);
+inline std::string string_to_lower_copy(const std::string& s);
// Remove (in place) all whitespaces at the beginning of a string.
-inline void string_trim_left(std::string &s);
+inline void string_trim_left(std::string& s);
// Remove (in place) all whitespaces at the end of a string.
-inline void string_trim_right(std::string &s);
+inline void string_trim_right(std::string& s);
// Remove (in place) all whitespaces at the beginning and at the end of a string.
-inline void string_trim(std::string &s);
+inline void string_trim(std::string& s);
// Remove (copy) all whitespaces at the beginning of a string.
-inline std::string string_trim_left_copy(const std::string &s);
+inline std::string string_trim_left_copy(const std::string& s);
// Remove (copy) all whitespaces at the end of a string.
-inline std::string string_trim_right_copy(const std::string &s);
+inline std::string string_trim_right_copy(const std::string& s);
// Remove (copy) all whitespaces at the beginning and at the end of a string.
-inline std::string string_trim_copy(const std::string &s);
+inline std::string string_trim_copy(const std::string& s);
// Split a string at the given delimiters into a vector of substrings.
// E.g. specify std::string(" |,") in order to split at characters ' ' and ','.
-inline std::vector<std::string> string_split(std::string s, const std::string &delimiters);
+inline std::vector< std::string > string_split(std::string s, const std::string& delimiters);
// Replace (in place) all occurrences of substring "old" with substring "new".
-inline void string_replace_all(std::string &s, const std::string &oldSubstr, const std::string &newSubstr);
+inline void string_replace_all(std::string& s, const std::string& oldSubstr, const std::string& newSubstr);
// Replace (copy) all occurrences of substring "old" with substring "new".
-inline std::string string_replace_all_copy(const std::string &s, const std::string &oldSubstr, const std::string &newSubstr);
+inline std::string string_replace_all_copy(const std::string& s, const std::string& oldSubstr,
+ const std::string& newSubstr);
// Check whether a string ends with a certain substring.
-inline bool string_ends_with(const std::string &s, const std::string &substr);
+inline bool string_ends_with(const std::string& s, const std::string& substr);
// Case-insensitive std::string::compare.
-inline int string_icompare(const std::string &s1, const std::string &s2);
+inline int string_icompare(const std::string& s1, const std::string& s2);
+
+// Convert a floating point number to string with a specified number of decimal places.
+template< typename T >
+inline std::string to_string_with_precision(T number, uint_t decimalPlaces);
+
+// Convert a floating point number to string with only the relevant number of decimal places, i.e., zeros at the end are
+// cut off.
+template< typename T >
+inline std::string to_string_only_relevant_digits(T number);
} // namespace walberla
diff --git a/src/core/StringUtility.impl.h b/src/core/StringUtility.impl.h
index 730bf592867b6d2b7abbf134300431b3de25bfbf..02b5f3937216ea5345368505ef8664ec53b1eb34 100644
--- a/src/core/StringUtility.impl.h
+++ b/src/core/StringUtility.impl.h
@@ -31,61 +31,76 @@
namespace walberla
{
// Convert (in place) every character in string to uppercase.
-inline void string_to_upper(std::string &s) {
- std::transform(s.begin(), s.end(), s.begin(), [](char c){ return static_cast<char>(std::toupper(static_cast<unsigned char>(c))); });
+inline void string_to_upper(std::string& s)
+{
+ std::transform(s.begin(), s.end(), s.begin(),
+ [](char c) { return static_cast< char >(std::toupper(static_cast< unsigned char >(c))); });
}
// Convert (copy) every character in string to uppercase.
-inline std::string string_to_upper_copy(const std::string &s) {
+inline std::string string_to_upper_copy(const std::string& s)
+{
std::string result = s;
string_to_upper(result);
return result;
}
// Convert (in place) every character in string to lowercase.
-inline void string_to_lower(std::string &s) {
- std::transform(s.begin(), s.end(), s.begin(), [](char c){ return static_cast<char>(std::tolower(static_cast<unsigned char>(c))); });
+inline void string_to_lower(std::string& s)
+{
+ std::transform(s.begin(), s.end(), s.begin(),
+ [](char c) { return static_cast< char >(std::tolower(static_cast< unsigned char >(c))); });
}
// Convert (copy) every character in string to lowercase.
-inline std::string string_to_lower_copy(const std::string &s) {
+inline std::string string_to_lower_copy(const std::string& s)
+{
std::string result = s;
string_to_lower(result);
return result;
}
// Remove (in place) all whitespaces at the beginning of a string.
-inline void string_trim_left(std::string &s) {
- s.erase(s.begin(), std::find_if(s.begin(), s.end(), [](char c) { return ! std::isspace(static_cast<unsigned char>(c)); }));
+inline void string_trim_left(std::string& s)
+{
+ s.erase(s.begin(),
+ std::find_if(s.begin(), s.end(), [](char c) { return !std::isspace(static_cast< unsigned char >(c)); }));
}
// Remove (in place) all whitespaces at the end of a string.
-inline void string_trim_right(std::string &s) {
- s.erase(std::find_if(s.rbegin(), s.rend(), [](char c) { return ! std::isspace(static_cast<unsigned char>(c)); }).base(), s.end());
+inline void string_trim_right(std::string& s)
+{
+ s.erase(
+ std::find_if(s.rbegin(), s.rend(), [](char c) { return !std::isspace(static_cast< unsigned char >(c)); }).base(),
+ s.end());
}
// Remove (in place) all whitespaces at the beginning and at the end of a string.
-inline void string_trim(std::string &s) {
+inline void string_trim(std::string& s)
+{
string_trim_left(s);
string_trim_right(s);
}
// Remove (copy) all whitespaces at the beginning of a string.
-inline std::string string_trim_left_copy(const std::string &s) {
+inline std::string string_trim_left_copy(const std::string& s)
+{
std::string result = s;
string_trim_left(result);
return result;
}
// Remove (copy) all whitespaces at the end of a string.
-inline std::string string_trim_right_copy(const std::string &s) {
+inline std::string string_trim_right_copy(const std::string& s)
+{
std::string result = s;
string_trim_left(result);
return result;
}
// Remove (copy) all whitespaces at the beginning and at the end of a string.
-inline std::string string_trim_copy(const std::string &s) {
+inline std::string string_trim_copy(const std::string& s)
+{
std::string result = s;
string_trim_left(result);
return result;
@@ -93,17 +108,22 @@ inline std::string string_trim_copy(const std::string &s) {
// Split a string at the given delimiters into a vector of substrings.
// E.g. specify std::string(" ,") in order to split at characters ' ' and ','.
-inline std::vector<std::string> string_split(std::string s, const std::string &delimiters) {
- std::vector<std::string> substrings;
+inline std::vector< std::string > string_split(std::string s, const std::string& delimiters)
+{
+ std::vector< std::string > substrings;
- auto sub_begin = s.begin(); // iterator to the begin and end of a substring
- auto sub_end = sub_begin;
+ auto sub_begin = s.begin(); // iterator to the begin and end of a substring
+ auto sub_end = sub_begin;
- for (auto it = s.begin(); it != s.end(); ++it) {
- for (auto d : delimiters) {
- if (*it == d) { // current character in s is a delimiter
+ for (auto it = s.begin(); it != s.end(); ++it)
+ {
+ for (auto d : delimiters)
+ {
+ if (*it == d)
+ { // current character in s is a delimiter
sub_end = it;
- if (sub_begin < sub_end) { // make sure that the substring is not empty
+ if (sub_begin < sub_end)
+ { // make sure that the substring is not empty
substrings.emplace_back(sub_begin, sub_end);
}
sub_begin = ++sub_end;
@@ -113,38 +133,73 @@ inline std::vector<std::string> string_split(std::string s, const std::string &d
}
// add substring from last delimiter to the end of s
- if (sub_begin < s.end()) {
- substrings.emplace_back(sub_begin, s.end());
- }
+ if (sub_begin < s.end()) { substrings.emplace_back(sub_begin, s.end()); }
return substrings;
}
// Replace (in place) all occurrences of substring "old" with substring "new".
-inline void string_replace_all(std::string &s, const std::string &oldSubstr, const std::string &newSubstr) {
+inline void string_replace_all(std::string& s, const std::string& oldSubstr, const std::string& newSubstr)
+{
// loop written to avoid infinite-loops when newSubstr contains oldSubstr
- for (size_t pos = s.find(oldSubstr); pos != std::string::npos;) {
+ for (size_t pos = s.find(oldSubstr); pos != std::string::npos;)
+ {
s.replace(pos, oldSubstr.length(), newSubstr);
pos = s.find(oldSubstr, pos + newSubstr.length());
}
}
// Replace (copy) all occurrences of substring "old" with substring "new".
-inline std::string string_replace_all_copy(const std::string &s, const std::string &oldSubstr, const std::string &newSubstr) {
+inline std::string string_replace_all_copy(const std::string& s, const std::string& oldSubstr,
+ const std::string& newSubstr)
+{
std::string result = s;
string_replace_all(result, oldSubstr, newSubstr);
return result;
}
// Check whether a string ends with a certain substring.
-inline bool string_ends_with(const std::string &s, const std::string &substr) {
+inline bool string_ends_with(const std::string& s, const std::string& substr)
+{
return s.rfind(substr) == (s.length() - substr.length());
}
// Case-insensitive wrapper for std::string::compare (return values as for std::string::compare).
-inline int string_icompare(const std::string &s1, const std::string &s2) {
+inline int string_icompare(const std::string& s1, const std::string& s2)
+{
// function std::string::compare returns 0 in case of equality => invert result to obtain expected bool behavior
return string_to_lower_copy(s1).compare(string_to_lower_copy(s2));
}
+// Convert a floating point number to string with a specified number of decimal places.
+template< typename T >
+inline std::string to_string_with_precision(T number, uint_t decimalPlaces)
+{
+ return std::to_string(number).substr(0, std::to_string(number).find(".") + decimalPlaces + 1);
+}
+
+// Convert a floating point number to string with only the relevant number of decimal places, i.e., zeros at the end are
+// cut off.
+template< typename T >
+inline std::string to_string_only_relevant_digits(T number)
+{
+ if (std::numeric_limits< T >::is_integer) { return std::to_string(number); }
+
+ // get integer part of number
+ std::string integerPart = std::to_string(number).substr(0, std::to_string(number).find(".") + 1);
+
+ // get fractional part of number
+ std::string fractionalPart = std::to_string(number).substr(std::to_string(number).find(".") + 1);
+
+ // remove any 0 at the end of the number's fractional part
+ fractionalPart = fractionalPart.substr(0, fractionalPart.find_last_not_of('0') + 1);
+
+ // remove "." of integerPart if fractionalPart is empty
+ if (fractionalPart.empty()) {
+ integerPart.pop_back();
+ }
+
+ return integerPart + fractionalPart;
+}
+
} // namespace walberla
diff --git a/src/core/cell/Cell.h b/src/core/cell/Cell.h
index 63a650dbd0dd11ef5a9ef6f03564131c8efe0e0a..8f41297b78a1ff66d4cc7a9f39f98692d11d1b49 100644
--- a/src/core/cell/Cell.h
+++ b/src/core/cell/Cell.h
@@ -1,15 +1,15 @@
//======================================================================================================================
//
-// This file is part of waLBerla. waLBerla is free software: you can
+// This file is part of waLBerla. waLBerla is free software: you can
// redistribute it and/or modify it under the terms of the GNU General Public
-// License as published by the Free Software Foundation, either version 3 of
+// License as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
-//
-// waLBerla is distributed in the hope that it will be useful, but WITHOUT
-// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
-//
+//
// You should have received a copy of the GNU General Public License along
// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
//
@@ -24,6 +24,7 @@
#include "core/DataTypes.h"
#include "core/debug/Debug.h"
+#include "core/math/Vector3.h"
#include "core/mpi/BufferSizeTrait.h"
#include "core/mpi/RecvBuffer.h"
#include "core/mpi/SendBuffer.h"
@@ -51,6 +52,7 @@ public:
inline Cell( const cell_idx_t _x, const cell_idx_t _y, const cell_idx_t _z ) { cell[0] = _x; cell[1] = _y; cell[2] = _z; }
//inline Cell( const int _x, const int _y, const int _z );
inline Cell( const uint_t _x, const uint_t _y, const uint_t _z );
+ inline Cell( const Vector3<cell_idx_t>& vec ){ cell[0] = vec[0]; cell[1] = vec[1]; cell[2] = vec[2]; };
//@}
/*! \name Arithmetic operators */
diff --git a/src/core/stringToNum.h b/src/core/stringToNum.h
index d031b53d309dbd5c3a848bb1ba26e9022b8606d5..10c897956d7fe466bcf109e49a8448e8f4b4d56d 100644
--- a/src/core/stringToNum.h
+++ b/src/core/stringToNum.h
@@ -1,15 +1,15 @@
//======================================================================================================================
//
-// This file is part of waLBerla. waLBerla is free software: you can
+// This file is part of waLBerla. waLBerla is free software: you can
// redistribute it and/or modify it under the terms of the GNU General Public
-// License as published by the Free Software Foundation, either version 3 of
+// License as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
-//
-// waLBerla is distributed in the hope that it will be useful, but WITHOUT
-// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
// for more details.
-//
+//
// You should have received a copy of the GNU General Public License along
// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
//
diff --git a/src/lbm/CMakeLists.txt b/src/lbm/CMakeLists.txt
index 511aafa84a04ca44385c22acba0cd02891640cc3..829e0505b5ff2d832c87aac94e39f93e1d3961b9 100644
--- a/src/lbm/CMakeLists.txt
+++ b/src/lbm/CMakeLists.txt
@@ -1,6 +1,6 @@
###################################################################################################
#
-# Module lbm
+# Module lbm
#
###################################################################################################
@@ -33,6 +33,7 @@ add_subdirectory( blockforest )
add_subdirectory( sweeps )
add_subdirectory( communication )
add_subdirectory( field )
+add_subdirectory( free_surface )
add_subdirectory( refinement )
add_subdirectory( gui )
add_subdirectory( boundary )
@@ -47,4 +48,3 @@ add_subdirectory( inplace_streaming )
###################################################################################################
-
\ No newline at end of file
diff --git a/src/lbm/blockforest/communication/CMakeLists.txt b/src/lbm/blockforest/communication/CMakeLists.txt
new file mode 100644
index 0000000000000000000000000000000000000000..a39e2f18741edaabe67ef1f946974f625f102bc6
--- /dev/null
+++ b/src/lbm/blockforest/communication/CMakeLists.txt
@@ -0,0 +1,5 @@
+target_sources( lbm
+ PRIVATE
+ SimpleCommunication.h
+ UpdateSecondGhostLayer.h
+ )
diff --git a/src/lbm/blockforest/communication/SimpleCommunication.h b/src/lbm/blockforest/communication/SimpleCommunication.h
new file mode 100644
index 0000000000000000000000000000000000000000..42bffe263761d7c541a43ebff4b21e17eac168c1
--- /dev/null
+++ b/src/lbm/blockforest/communication/SimpleCommunication.h
@@ -0,0 +1,170 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file SimpleCommunication.h
+//! \ingroup blockforest
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "blockforest/communication/UniformBufferedScheme.h"
+
+#include "core/Abort.h"
+#include "core/math/Vector3.h"
+#include "core/mpi/BufferDataTypeExtensions.h"
+
+#include "field/FlagField.h"
+#include "field/communication/PackInfo.h"
+
+#include "lbm/communication/PdfFieldPackInfo.h"
+
+namespace walberla
+{
+namespace blockforest
+{
+using communication::UniformBufferedScheme;
+
+template< typename Stencil_T >
+class SimpleCommunication : public communication::UniformBufferedScheme< Stencil_T >
+{
+ using RealScalarField_T = GhostLayerField< real_t, 1 >;
+ using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+ using PdfField_T = GhostLayerField< real_t, Stencil_T::Size >;
+ using UintScalarField_T = GhostLayerField< uint_t, 1 >;
+
+ using FlagField16_T = FlagField< uint16_t >;
+ using FlagField32_T = FlagField< uint32_t >;
+ using FlagField64_T = FlagField< uint64_t >;
+
+ public:
+ SimpleCommunication(const std::weak_ptr< StructuredBlockForest >& blockForest, BlockDataID f1)
+ : UniformBufferedScheme< Stencil_T >(blockForest), blockForest_(blockForest)
+ {
+ (*this) << f1;
+ }
+ SimpleCommunication(const std::weak_ptr< StructuredBlockForest >& blockForest, BlockDataID f1, BlockDataID f2)
+ : UniformBufferedScheme< Stencil_T >(blockForest), blockForest_(blockForest)
+ {
+ (*this) << f1 << f2;
+ }
+ SimpleCommunication(const std::weak_ptr< StructuredBlockForest >& blockForest, BlockDataID f1, BlockDataID f2,
+ BlockDataID f3)
+ : UniformBufferedScheme< Stencil_T >(blockForest), blockForest_(blockForest)
+ {
+ (*this) << f1 << f2 << f3;
+ }
+
+ SimpleCommunication(const std::weak_ptr< StructuredBlockForest >& blockForest, BlockDataID f1, BlockDataID f2,
+ BlockDataID f3, BlockDataID f4)
+ : UniformBufferedScheme< Stencil_T >(blockForest), blockForest_(blockForest)
+ {
+ (*this) << f1 << f2 << f3 << f4;
+ }
+ SimpleCommunication(const std::weak_ptr< StructuredBlockForest >& blockForest, BlockDataID f1, BlockDataID f2,
+ BlockDataID f3, BlockDataID f4, BlockDataID f5)
+ : UniformBufferedScheme< Stencil_T >(blockForest), blockForest_(blockForest)
+ {
+ (*this) << f1 << f2 << f3 << f4 << f5;
+ }
+ SimpleCommunication(const std::weak_ptr< StructuredBlockForest >& blockForest, BlockDataID f1, BlockDataID f2,
+ BlockDataID f3, BlockDataID f4, BlockDataID f5, BlockDataID f6)
+ : UniformBufferedScheme< Stencil_T >(blockForest), blockForest_(blockForest)
+ {
+ (*this) << f1 << f2 << f3 << f4 << f5 << f6;
+ }
+ SimpleCommunication(const std::weak_ptr< StructuredBlockForest >& blockForest, BlockDataID f1, BlockDataID f2,
+ BlockDataID f3, BlockDataID f4, BlockDataID f5, BlockDataID f6, BlockDataID f7)
+ : UniformBufferedScheme< Stencil_T >(blockForest), blockForest_(blockForest)
+ {
+ (*this) << f1 << f2 << f3 << f4 << f5 << f6 << f7;
+ }
+ SimpleCommunication(const std::weak_ptr< StructuredBlockForest >& blockForest, BlockDataID f1, BlockDataID f2,
+ BlockDataID f3, BlockDataID f4, BlockDataID f5, BlockDataID f6, BlockDataID f7, BlockDataID f8)
+ : UniformBufferedScheme< Stencil_T >(blockForest), blockForest_(blockForest)
+ {
+ (*this) << f1 << f2 << f3 << f4 << f5 << f6 << f7 << f8;
+ }
+
+ SimpleCommunication& operator<<(BlockDataID fieldId)
+ {
+ auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ if (blockForest->begin() == blockForest->end()) { return *this; }
+
+ IBlock& firstBlock = *(blockForest->begin());
+
+ using field::communication::PackInfo;
+
+ if (firstBlock.isDataClassOrSubclassOf< PdfField_T >(fieldId))
+ {
+ this->addPackInfo(make_shared< PackInfo< PdfField_T > >(fieldId));
+ }
+ else
+ {
+ if (firstBlock.isDataClassOrSubclassOf< RealScalarField_T >(fieldId))
+ {
+ this->addPackInfo(make_shared< PackInfo< RealScalarField_T > >(fieldId));
+ }
+ else
+ {
+ if (firstBlock.isDataClassOrSubclassOf< VectorField_T >(fieldId))
+ {
+ this->addPackInfo(make_shared< PackInfo< VectorField_T > >(fieldId));
+ }
+ else
+ {
+ if (firstBlock.isDataClassOrSubclassOf< FlagField16_T >(fieldId))
+ {
+ this->addPackInfo(make_shared< PackInfo< FlagField16_T > >(fieldId));
+ }
+ else
+ {
+ if (firstBlock.isDataClassOrSubclassOf< FlagField32_T >(fieldId))
+ {
+ this->addPackInfo(make_shared< PackInfo< FlagField32_T > >(fieldId));
+ }
+ else
+ {
+ if (firstBlock.isDataClassOrSubclassOf< FlagField64_T >(fieldId))
+ {
+ this->addPackInfo(make_shared< PackInfo< FlagField64_T > >(fieldId));
+ }
+ else
+ {
+ if (firstBlock.isDataClassOrSubclassOf< UintScalarField_T >(fieldId))
+ {
+ this->addPackInfo(make_shared< PackInfo< UintScalarField_T > >(fieldId));
+ }
+ else { WALBERLA_ABORT("Problem with UID"); }
+ }
+ }
+ }
+ }
+ }
+ }
+
+ return *this;
+ }
+
+ protected:
+ std::weak_ptr< StructuredBlockForest > blockForest_;
+}; // class SimpleCommunication
+
+} // namespace blockforest
+} // namespace walberla
diff --git a/src/lbm/blockforest/communication/UpdateSecondGhostLayer.h b/src/lbm/blockforest/communication/UpdateSecondGhostLayer.h
new file mode 100644
index 0000000000000000000000000000000000000000..1e9c69ed1c1bd38efd71f22775199ef5693713b2
--- /dev/null
+++ b/src/lbm/blockforest/communication/UpdateSecondGhostLayer.h
@@ -0,0 +1,144 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file UpdateSecondGhostLayer.h
+//! \ingroup blockforest
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "blockforest/StructuredBlockForest.h"
+
+namespace walberla
+{
+namespace blockforest
+{
+/********************************************************************************************************************
+ * Manual update of a field's second and further ghost layers in setups with domain size = 1 and periodicity in at
+ * least one direction.
+ *
+ * If a field has two ghost layers and if the inner field has only a size of one (in one or more directions),
+ * regular communication does not update the second (and further) ghost layers correctly. Here, the content of the
+ * first ghost layers is manually copied to the second (and further) ghost layers when the dimension of the field is
+ * one in this direction.
+ *******************************************************************************************************************/
+template< typename Field_T >
+class UpdateSecondGhostLayer
+{
+ public:
+ UpdateSecondGhostLayer(const std::weak_ptr< StructuredBlockForest >& blockForestPtr, BlockDataID fieldID)
+ : blockForest_(blockForestPtr), fieldID_(fieldID)
+ {
+ const auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ Field_T* const field = blockIt->template getData< Field_T >(fieldID_);
+
+ // this function is only necessary if the flag field has at least two ghost layers
+ if (field->nrOfGhostLayers() < uint_c(2)) { isNecessary_ = false; }
+ else
+ {
+ // running this function is only necessary when the field is of size 1 in at least one direction
+ isNecessary_ = (field->xSize() == uint_c(1) && blockForest->isXPeriodic()) ||
+ (field->ySize() == uint_c(1) && blockForest->isYPeriodic()) ||
+ (field->zSize() == uint_c(1) && blockForest->isZPeriodic());
+ }
+ }
+ }
+
+ void operator()()
+ {
+ if (!isNecessary_) { return; }
+
+ const auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ Field_T* const field = blockIt->template getData< Field_T >(fieldID_);
+
+ if (field->xSize() == uint_c(1) && blockForest->isXPeriodic())
+ {
+ // iterate ghost layer at x == -1
+ for (auto fieldIt = field->beginGhostLayerOnly(uint_c(1), stencil::W, true); fieldIt != field->end();
+ ++fieldIt)
+ {
+ // copy data from ghost layer at x == -1 to x == -2
+ fieldIt.neighbor(stencil::W) = *fieldIt;
+ }
+
+ // iterate ghost layer at x == xSize()+1
+ for (auto fieldIt = field->beginGhostLayerOnly(uint_c(1), stencil::E, true); fieldIt != field->end();
+ ++fieldIt)
+ {
+ // copy data from ghost layer at x == xSize()+1 to x == xSize()+2
+ fieldIt.neighbor(stencil::E) = *fieldIt;
+ }
+ }
+
+ if (field->ySize() == uint_c(1) && blockForest->isYPeriodic())
+ {
+ // iterate ghost layer at y == -1
+ for (auto fieldIt = field->beginGhostLayerOnly(uint_c(1), stencil::S, true); fieldIt != field->end();
+ ++fieldIt)
+ {
+ // copy data from ghost layer at y == -1 to y == -2
+ fieldIt.neighbor(stencil::S) = *fieldIt;
+ }
+
+ // iterate ghost layer at y == ySize()+1
+ for (auto fieldIt = field->beginGhostLayerOnly(uint_c(1), stencil::N, true); fieldIt != field->end();
+ ++fieldIt)
+ {
+ // copy data from ghost layer at y == ySize()+1 to y == ySize()+2
+ fieldIt.neighbor(stencil::N) = *fieldIt;
+ }
+ }
+
+ if (field->zSize() == uint_c(1) && blockForest->isZPeriodic())
+ {
+ // iterate ghost layer at z == -1
+ for (auto fieldIt = field->beginGhostLayerOnly(uint_c(1), stencil::B, true); fieldIt != field->end();
+ ++fieldIt)
+ {
+ // copy data from ghost layer at z == -1 to z == -2
+ fieldIt.neighbor(stencil::B) = *fieldIt;
+ }
+
+ // iterate ghost layer at y == zSize()+1
+ for (auto fieldIt = field->beginGhostLayerOnly(uint_c(1), stencil::T, true); fieldIt != field->end();
+ ++fieldIt)
+ {
+ // copy data from ghost layer at z == zSize()+1 to z == zSize()+2
+ fieldIt.neighbor(stencil::T) = *fieldIt;
+ }
+ }
+ }
+ }
+
+ private:
+ std::weak_ptr< StructuredBlockForest > blockForest_;
+
+ BlockDataID fieldID_;
+
+ bool isNecessary_;
+}; // class UpdateSecondGhostLayer
+
+} // namespace blockforest
+} // namespace walberla
diff --git a/src/lbm/boundary/SimpleExtrapolationOutflow.h b/src/lbm/boundary/SimpleExtrapolationOutflow.h
new file mode 100644
index 0000000000000000000000000000000000000000..46c43aa70a9b9958955ca21a3c2e5892234b975f
--- /dev/null
+++ b/src/lbm/boundary/SimpleExtrapolationOutflow.h
@@ -0,0 +1,114 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file SimpleExtrapolationOutflow.h
+//! \ingroup lbm
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Outflow boundary condition based on extrapolation. See equation F.1 in Geier et al., 2005,
+//! doi: 10.1016/j.camwa.2015.05.001
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "boundary/Boundary.h"
+
+#include "core/DataTypes.h"
+#include "core/cell/CellInterval.h"
+#include "core/config/Config.h"
+#include "core/debug/Debug.h"
+
+#include "lbm/field/PdfField.h"
+
+#include "stencil/Directions.h"
+
+#include <vector>
+
+namespace walberla
+{
+namespace lbm
+{
+template< typename LatticeModel_T, typename FlagField_T >
+class SimpleExtrapolationOutflow : public Boundary< typename FlagField_T::flag_t >
+{
+ protected:
+ using PDFField = PdfField< LatticeModel_T >;
+ using Stencil = typename LatticeModel_T::Stencil;
+ using flag_t = typename FlagField_T::flag_t;
+
+ public:
+ static const bool threadsafe = true;
+
+ static shared_ptr< BoundaryConfiguration > createConfiguration(const Config::BlockHandle& /*config*/)
+ {
+ return make_shared< BoundaryConfiguration >();
+ }
+
+ SimpleExtrapolationOutflow(const BoundaryUID& boundaryUID, const FlagUID& uid, PDFField* const pdfField)
+ : Boundary< flag_t >(boundaryUID), uid_(uid), pdfField_(pdfField)
+ {
+ WALBERLA_ASSERT_NOT_NULLPTR(pdfField_);
+ }
+
+ void pushFlags(std::vector< FlagUID >& uids) const { uids.push_back(uid_); }
+
+ void beforeBoundaryTreatment() const {}
+ void afterBoundaryTreatment() const {}
+
+ template< typename Buffer_T >
+ void packCell(Buffer_T&, const cell_idx_t, const cell_idx_t, const cell_idx_t) const
+ {}
+
+ template< typename Buffer_T >
+ void registerCell(Buffer_T&, const flag_t, const cell_idx_t, const cell_idx_t, const cell_idx_t)
+ {}
+ void registerCell(const flag_t, const cell_idx_t, const cell_idx_t, const cell_idx_t, const BoundaryConfiguration&)
+ {}
+
+ void registerCells(const flag_t, const CellInterval&, const BoundaryConfiguration&) {}
+ template< typename CellIterator >
+ void registerCells(const flag_t, const CellIterator&, const CellIterator&, const BoundaryConfiguration&)
+ {}
+
+ void unregisterCell(const flag_t, const cell_idx_t, const cell_idx_t, const cell_idx_t) const {}
+
+#ifndef NDEBUG
+ inline void treatDirection(const cell_idx_t x, const cell_idx_t y, const cell_idx_t z, const stencil::Direction dir,
+ const cell_idx_t nx, const cell_idx_t ny, const cell_idx_t nz, const flag_t mask)
+#else
+ inline void treatDirection(const cell_idx_t x, const cell_idx_t y, const cell_idx_t z, const stencil::Direction dir,
+ const cell_idx_t nx, const cell_idx_t ny, const cell_idx_t nz, const flag_t /*mask*/)
+#endif
+ {
+ WALBERLA_ASSERT_EQUAL(nx, x + cell_idx_c(stencil::cx[dir]));
+ WALBERLA_ASSERT_EQUAL(ny, y + cell_idx_c(stencil::cy[dir]));
+ WALBERLA_ASSERT_EQUAL(nz, z + cell_idx_c(stencil::cz[dir]));
+ WALBERLA_ASSERT_UNEQUAL(mask & this->mask_, numeric_cast< flag_t >(0));
+
+ // only true if "this->mask_" only contains one single flag, which is the case for the current implementation of
+ // this boundary condition (Outlet)
+ WALBERLA_ASSERT_EQUAL(mask & this->mask_, this->mask_);
+
+ // equation F.1 in Geier et al. 2015
+ pdfField_->get(nx, ny, nz, Stencil::invDirIdx(dir)) = pdfField_->get(x, y, z, Stencil::invDirIdx(dir));
+ }
+
+ private:
+ const FlagUID uid_;
+ PDFField* const pdfField_;
+}; // class Outlet
+
+} // namespace lbm
+} // namespace walberla
\ No newline at end of file
diff --git a/src/lbm/boundary/all.h b/src/lbm/boundary/all.h
index 31709c60e0e538dddaaf537fe0d661fb2b4833c1..11f7698b3a79b9596219eede7d177af33cf0b211 100644
--- a/src/lbm/boundary/all.h
+++ b/src/lbm/boundary/all.h
@@ -34,6 +34,7 @@
#include "ParserUBB.h"
#include "Pressure.h"
#include "SimpleDiffusionDirichlet.h"
+#include "SimpleExtrapolationOutflow.h"
#include "SimplePAB.h"
#include "SimplePressure.h"
#include "SimpleUBB.h"
diff --git a/src/lbm/free_surface/BlockStateDetectorSweep.h b/src/lbm/free_surface/BlockStateDetectorSweep.h
new file mode 100644
index 0000000000000000000000000000000000000000..f2ef50bd14813126e512dc42a00ff225892af86c
--- /dev/null
+++ b/src/lbm/free_surface/BlockStateDetectorSweep.h
@@ -0,0 +1,111 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file BlockStateDetectorSweep.h
+//! \ingroup free_surface
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Set block states according to their content, i.e., free surface flags.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/uid/SUID.h"
+
+#include "FlagInfo.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Set block states according to free surface flag field:
+ * - blocks that contain at least one interface cell are marked as "fullFreeSurface" (computationally most expensive
+ * type of blocks)
+ * - cells without interface cell and with at least one liquid cell are marked "onlyLBM"
+ * - all other blocks are marked as "onlyGasAndBoundary"
+ **********************************************************************************************************************/
+template< typename FlagField_T >
+class BlockStateDetectorSweep
+{
+ public:
+ static const SUID fullFreeSurface;
+ static const SUID onlyGasAndBoundary;
+ static const SUID onlyLBM;
+
+ BlockStateDetectorSweep(const std::weak_ptr< StructuredBlockForest >& blockForestPtr,
+ FlagInfo< FlagField_T > flagInfo, ConstBlockDataID flagFieldID)
+ : flagFieldID_(flagFieldID), flagInfo_(flagInfo)
+ {
+ const auto blockForest = blockForestPtr.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ (*this)(&(*blockIt)); // initialize block states
+ }
+ }
+
+ void operator()(IBlock* const block)
+ {
+ bool liquidFound = false;
+ bool interfaceFound = false;
+
+ const FlagField_T* const flagField = block->getData< const FlagField_T >(flagFieldID_);
+
+ // search the flag field for interface and liquid cells
+ WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ(flagField, uint_c(1), {
+ const typename FlagField_T::ConstPtr flagFieldPtr(*flagField, x, y, z);
+
+ // at inflow boundaries, interface cells are generated; therefore, the block must be fullFreeSurface even if it
+ // does not yet contain an interface cell
+ if (flagInfo_.isInterface(flagFieldPtr) || flagInfo_.isInflow(flagFieldPtr))
+ {
+ interfaceFound = true;
+ break; // stop search, as this block belongs already to the computationally most expensive block type
+ }
+
+ if (flagInfo_.isLiquid(flagFieldPtr)) { liquidFound = true; }
+ }) // WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ
+
+ block->clearState();
+ if (interfaceFound)
+ {
+ block->addState(fullFreeSurface);
+ return;
+ }
+ if (liquidFound)
+ {
+ block->addState(onlyLBM);
+ return;
+ }
+ block->addState(onlyGasAndBoundary);
+ }
+
+ protected:
+ ConstBlockDataID flagFieldID_;
+ FlagInfo< FlagField_T > flagInfo_;
+}; // class BlockStateDetectorSweep
+
+template< typename FlagField_T >
+const SUID BlockStateDetectorSweep< FlagField_T >::fullFreeSurface = SUID("fullFreeSurface");
+template< typename FlagField_T >
+const SUID BlockStateDetectorSweep< FlagField_T >::onlyGasAndBoundary = SUID("onlyGasAndBoundary");
+template< typename FlagField_T >
+const SUID BlockStateDetectorSweep< FlagField_T >::onlyLBM = SUID("onlyLBM");
+
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/CMakeLists.txt b/src/lbm/free_surface/CMakeLists.txt
new file mode 100644
index 0000000000000000000000000000000000000000..54b500251a5be6f3e48f70addb53a4e5fd090a69
--- /dev/null
+++ b/src/lbm/free_surface/CMakeLists.txt
@@ -0,0 +1,19 @@
+target_sources( lbm
+ PRIVATE
+ BlockStateDetectorSweep.h
+ FlagDefinitions.h
+ FlagInfo.h
+ FlagInfo.impl.h
+ InitFunctions.h
+ InterfaceFromFillLevel.h
+ LoadBalancing.h
+ MaxVelocityComputer.h
+ SurfaceMeshWriter.h
+ TotalMassComputer.h
+ VtkWriter.h
+ )
+
+add_subdirectory( boundary )
+add_subdirectory( bubble_model )
+add_subdirectory( dynamics )
+add_subdirectory( surface_geometry )
diff --git a/src/lbm/free_surface/FlagDefinitions.h b/src/lbm/free_surface/FlagDefinitions.h
new file mode 100644
index 0000000000000000000000000000000000000000..4dd93303a0f79fc445ad09e5709cd57e89215b98
--- /dev/null
+++ b/src/lbm/free_surface/FlagDefinitions.h
@@ -0,0 +1,51 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file FlagInfo.h
+//! \ingroup free_surface
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Define free surface flags (e.g. conversion flags).
+//
+//======================================================================================================================
+
+#include "field/FlagUID.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace flagIDs
+{
+/***********************************************************************************************************************
+ * Definition of free surface flag IDs.
+ **********************************************************************************************************************/
+const field::FlagUID interfaceFlagID = field::FlagUID("interface");
+const field::FlagUID liquidFlagID = field::FlagUID("liquid");
+const field::FlagUID gasFlagID = field::FlagUID("gas");
+const field::FlagUID convertedFlagID = field::FlagUID("converted");
+const field::FlagUID convertToGasFlagID = field::FlagUID("convert to gas");
+const field::FlagUID convertToLiquidFlagID = field::FlagUID("convert to liquid");
+const field::FlagUID convertedFromGasToInterfaceFlagID = field::FlagUID("convert from gas to interface");
+const field::FlagUID keepInterfaceForWettingFlagID = field::FlagUID("convert to and keep interface for wetting");
+const field::FlagUID convertToInterfaceForInflowFlagID = field::FlagUID("convert to interface for inflow");
+
+const Set< field::FlagUID > liquidInterfaceFlagIDs = setUnion< field::FlagUID >(liquidFlagID, interfaceFlagID);
+
+const Set< field::FlagUID > liquidInterfaceGasFlagIDs =
+ setUnion(liquidInterfaceFlagIDs, Set< field::FlagUID >(gasFlagID));
+
+} // namespace flagIDs
+} // namespace free_surface
+} // namespace walberla
\ No newline at end of file
diff --git a/src/lbm/free_surface/FlagInfo.h b/src/lbm/free_surface/FlagInfo.h
new file mode 100644
index 0000000000000000000000000000000000000000..e332cf8dce916946fc1f36a18c3ce4aa0b8864d9
--- /dev/null
+++ b/src/lbm/free_surface/FlagInfo.h
@@ -0,0 +1,215 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file FlagInfo.h
+//! \ingroup free_surface
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Manage free surface flags (e.g. conversion flags).
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/mpi/Broadcast.h"
+
+#include "domain_decomposition/StructuredBlockStorage.h"
+
+#include "field/FlagField.h"
+
+#include "FlagDefinitions.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Manage free surface flags (e.g. conversion flags).
+ **********************************************************************************************************************/
+template< typename FlagField_T >
+class FlagInfo
+{
+ public:
+ using flag_t = typename FlagField_T::flag_t;
+
+ FlagInfo();
+ FlagInfo(const Set< field::FlagUID >& obstacleIDs,
+ const Set< field::FlagUID >& outflowIDs = Set< field::FlagUID >::emptySet(),
+ const Set< field::FlagUID >& inflowIDs = Set< field::FlagUID >::emptySet(),
+ const Set< field::FlagUID >& freeSlipIDs = Set< field::FlagUID >::emptySet());
+
+ bool operator==(const FlagInfo& o) const;
+ bool operator!=(const FlagInfo& o) const;
+
+ flag_t interfaceFlag;
+ flag_t liquidFlag;
+ flag_t gasFlag;
+
+ flag_t convertedFlag; // interface cell that is already converted
+ flag_t convertToGasFlag; // interface cell with too low fill level, should be converted
+ flag_t convertToLiquidFlag; // interface cell with too high fill level, should be converted
+ flag_t convertFromGasToInterfaceFlag; // interface cell that was a gas cell and needs refilling of its pdfs
+ flag_t keepInterfaceForWettingFlag; // gas/liquid cell that needs to be converted to interface cell for a smooth
+ // continuation of the wetting surface (see dissertation of S. Donath, 2011,
+ // section 6.3.5.3)
+ flag_t convertToInterfaceForInflowFlag; // gas cell that needs to be converted to interface cell to enable inflow
+
+ flag_t obstacleFlagMask;
+ flag_t outflowFlagMask;
+ flag_t inflowFlagMask;
+ flag_t freeSlipFlagMask; // free slip obstacle cell (needs to be treated separately since PDFs going from gas into
+ // boundary are not available and must be reconstructed)
+
+ template< typename FieldItOrPtr_T >
+ inline bool isInterface(const FieldItOrPtr_T& flagItOrPtr) const
+ {
+ return isFlagSet(flagItOrPtr, interfaceFlag);
+ }
+ template< typename FieldItOrPtr_T >
+ inline bool isLiquid(const FieldItOrPtr_T& flagItOrPtr) const
+ {
+ return isFlagSet(flagItOrPtr, liquidFlag);
+ }
+ template< typename FieldItOrPtr_T >
+ inline bool isGas(const FieldItOrPtr_T& flagItOrPtr) const
+ {
+ return isFlagSet(flagItOrPtr, gasFlag);
+ }
+ template< typename FieldItOrPtr_T >
+ inline bool isObstacle(const FieldItOrPtr_T& flagItOrPtr) const
+ {
+ return isPartOfMaskSet(flagItOrPtr, obstacleFlagMask);
+ }
+ template< typename FieldItOrPtr_T >
+ inline bool isOutflow(const FieldItOrPtr_T& flagItOrPtr) const
+ {
+ return isPartOfMaskSet(flagItOrPtr, outflowFlagMask);
+ }
+ template< typename FieldItOrPtr_T >
+ inline bool isInflow(const FieldItOrPtr_T& flagItOrPtr) const
+ {
+ return isPartOfMaskSet(flagItOrPtr, inflowFlagMask);
+ }
+ template< typename FieldItOrPtr_T >
+ inline bool isFreeSlip(const FieldItOrPtr_T& flagItOrPtr) const
+ {
+ return isPartOfMaskSet(flagItOrPtr, freeSlipFlagMask);
+ }
+ template< typename FieldItOrPtr_T >
+ inline bool hasConverted(const FieldItOrPtr_T& flagItOrPtr) const
+ {
+ return isFlagSet(flagItOrPtr, convertedFlag);
+ }
+ template< typename FieldItOrPtr_T >
+ inline bool hasConvertedToGas(const FieldItOrPtr_T& flagItOrPtr) const
+ {
+ return isFlagSet(flagItOrPtr, convertToGasFlag);
+ }
+ template< typename FieldItOrPtr_T >
+ inline bool hasConvertedToLiquid(const FieldItOrPtr_T& flagItOrPtr) const
+ {
+ return isFlagSet(flagItOrPtr, convertToLiquidFlag);
+ }
+ template< typename FieldItOrPtr_T >
+ inline bool hasConvertedFromGasToInterface(const FieldItOrPtr_T& flagItOrPtr) const
+ {
+ return isFlagSet(flagItOrPtr, convertFromGasToInterfaceFlag);
+ }
+ template< typename FieldItOrPtr_T >
+ inline bool isKeepInterfaceForWetting(const FieldItOrPtr_T& flagItOrPtr) const
+ {
+ return isFlagSet(flagItOrPtr, keepInterfaceForWettingFlag);
+ }
+ template< typename FieldItOrPtr_T >
+ inline bool isConvertToInterfaceForInflow(const FieldItOrPtr_T& flagItOrPtr) const
+ {
+ return isFlagSet(flagItOrPtr, convertToInterfaceForInflowFlag);
+ }
+
+ inline bool isInterface(const flag_t val) const { return isFlagSet(val, interfaceFlag); }
+ inline bool isLiquid(const flag_t val) const { return isFlagSet(val, liquidFlag); }
+ inline bool isGas(const flag_t val) const { return isFlagSet(val, gasFlag); }
+ inline bool isObstacle(const flag_t val) const { return isPartOfMaskSet(val, obstacleFlagMask); }
+ inline bool isOutflow(const flag_t val) const { return isPartOfMaskSet(val, outflowFlagMask); }
+ inline bool isInflow(const flag_t val) const { return isPartOfMaskSet(val, inflowFlagMask); }
+ inline bool isFreeSlip(const flag_t val) const { return isPartOfMaskSet(val, freeSlipFlagMask); }
+ inline bool isKeepInterfaceForWetting(const flag_t val) const { return isFlagSet(val, keepInterfaceForWettingFlag); }
+ inline bool hasConvertedToGas(const flag_t val) const { return isFlagSet(val, convertToGasFlag); }
+ inline bool hasConvertedToLiquid(const flag_t val) const { return isFlagSet(val, convertToLiquidFlag); }
+ inline bool hasConvertedFromGasToInterface(const flag_t val) const
+ {
+ return isFlagSet(val, convertFromGasToInterfaceFlag);
+ }
+ inline bool isConvertToInterfaceForInflow(const flag_t val) const
+ {
+ return isFlagSet(val, convertToInterfaceForInflowFlag);
+ }
+
+ // check whether FlagInfo is identical on all blocks and all processes
+ bool isConsistentAcrossBlocksAndProcesses(const std::weak_ptr< StructuredBlockStorage >& blockStorage,
+ ConstBlockDataID flagFieldID) const;
+
+ // register flags in flag field
+ static void registerFlags(FlagField_T* field, const Set< field::FlagUID >& obstacleIDs,
+ const Set< field::FlagUID >& outflowIDs = Set< field::FlagUID >::emptySet(),
+ const Set< field::FlagUID >& inflowIDs = Set< field::FlagUID >::emptySet(),
+ const Set< field::FlagUID >& freeSlipIDs = Set< field::FlagUID >::emptySet());
+
+ void registerFlags(FlagField_T* field) const;
+
+ Set< field::FlagUID > getObstacleIDSet() const { return obstacleIDs_; }
+ Set< field::FlagUID > getOutflowIDs() const { return outflowIDs_; }
+ Set< field::FlagUID > getInflowIDs() const { return inflowIDs_; }
+ Set< field::FlagUID > getFreeSlipIDs() const { return freeSlipIDs_; }
+
+ protected:
+ FlagInfo(const FlagField_T* field, const Set< field::FlagUID >& obstacleIDs, const Set< field::FlagUID >& outflowIDs,
+ const Set< field::FlagUID >& inflowIDs, const Set< field::FlagUID >& freeSlipIDs);
+
+ // create sets of flag IDs with flags from free_surface/boundary/FreeSurfaceBoundaryHandling.impl.h
+ Set< field::FlagUID > obstacleIDs_;
+ Set< field::FlagUID > outflowIDs_;
+ Set< field::FlagUID > inflowIDs_;
+ Set< field::FlagUID > freeSlipIDs_;
+};
+
+template< typename FlagField_T >
+mpi::SendBuffer& operator<<(mpi::SendBuffer& buf, const FlagInfo< FlagField_T >& flagInfo)
+{
+ buf << flagInfo.interfaceFlag << flagInfo.liquidFlag << flagInfo.gasFlag << flagInfo.convertedFlag
+ << flagInfo.convertToGasFlag << flagInfo.convertToLiquidFlag << flagInfo.convertFromGasToInterfaceFlag
+ << flagInfo.keepInterfaceForWettingFlag << flagInfo.keepInterfaceForWettingFlag
+ << flagInfo.convertToInterfaceForInflowFlag << flagInfo.obstacleFlagMask << flagInfo.outflowFlagMask
+ << flagInfo.inflowFlagMask << flagInfo.freeSlipFlagMask;
+
+ return buf;
+}
+
+template< typename FlagField_T >
+mpi::RecvBuffer& operator>>(mpi::RecvBuffer& buf, FlagInfo< FlagField_T >& flagInfo)
+{
+ buf >> flagInfo.interfaceFlag >> flagInfo.liquidFlag >> flagInfo.gasFlag >> flagInfo.convertedFlag >>
+ flagInfo.convertToGasFlag >> flagInfo.convertToLiquidFlag >> flagInfo.convertFromGasToInterfaceFlag >>
+ flagInfo.keepInterfaceForWettingFlag >> flagInfo.keepInterfaceForWettingFlag >>
+ flagInfo.convertToInterfaceForInflowFlag >> flagInfo.obstacleFlagMask >> flagInfo.outflowFlagMask >>
+ flagInfo.inflowFlagMask >> flagInfo.freeSlipFlagMask;
+
+ return buf;
+}
+
+} // namespace free_surface
+} // namespace walberla
+
+#include "FlagInfo.impl.h"
\ No newline at end of file
diff --git a/src/lbm/free_surface/FlagInfo.impl.h b/src/lbm/free_surface/FlagInfo.impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..574001ea45642a76efc5dbb48d6a5d2b7cce6580
--- /dev/null
+++ b/src/lbm/free_surface/FlagInfo.impl.h
@@ -0,0 +1,199 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file FlagInfo.impl.h
+//! \ingroup free_surface
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Define and manage free surface flags (e.g. conversion flags).
+//
+//======================================================================================================================
+
+#include "core/DataTypes.h"
+#include "core/mpi/Broadcast.h"
+
+#include "field/FlagField.h"
+
+#include "FlagInfo.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+template< typename FlagField_T >
+FlagInfo< FlagField_T >::FlagInfo()
+ : interfaceFlag(0), liquidFlag(0), gasFlag(0), convertedFlag(0), convertToGasFlag(0), convertToLiquidFlag(0),
+ convertFromGasToInterfaceFlag(0), keepInterfaceForWettingFlag(0), convertToInterfaceForInflowFlag(0),
+ obstacleFlagMask(0), outflowFlagMask(0), inflowFlagMask(0), freeSlipFlagMask(0)
+{}
+
+template< typename FlagField_T >
+FlagInfo< FlagField_T >::FlagInfo(const FlagField_T* field, const Set< field::FlagUID >& obstacleIDs,
+ const Set< field::FlagUID >& outflowIDs, const Set< field::FlagUID >& inflowIDs,
+ const Set< field::FlagUID >& freeSlipIDs)
+ : interfaceFlag(field->getFlag(flagIDs::interfaceFlagID)), liquidFlag(field->getFlag(flagIDs::liquidFlagID)),
+ gasFlag(field->getFlag(flagIDs::gasFlagID)), convertedFlag(field->getFlag(flagIDs::convertedFlagID)),
+ convertToGasFlag(field->getFlag(flagIDs::convertToGasFlagID)),
+ convertToLiquidFlag(field->getFlag(flagIDs::convertToLiquidFlagID)),
+ convertFromGasToInterfaceFlag(field->getFlag(flagIDs::convertedFromGasToInterfaceFlagID)),
+ keepInterfaceForWettingFlag(field->getFlag(flagIDs::keepInterfaceForWettingFlagID)),
+ convertToInterfaceForInflowFlag(field->getFlag(flagIDs::convertToInterfaceForInflowFlagID)),
+ obstacleIDs_(obstacleIDs), outflowIDs_(outflowIDs), inflowIDs_(inflowIDs), freeSlipIDs_(freeSlipIDs)
+{
+ // create obstacleFlagMask from obstacleIDs using bitwise OR
+ obstacleFlagMask = 0;
+ for (auto obstacleID = obstacleIDs.begin(); obstacleID != obstacleIDs.end(); ++obstacleID)
+ {
+ obstacleFlagMask = flag_t(obstacleFlagMask | field->getFlag(*obstacleID));
+ }
+
+ // create outflowFlagMask from outflowIDs using bitwise OR
+ outflowFlagMask = 0;
+ for (auto outflowID = outflowIDs.begin(); outflowID != outflowIDs.end(); ++outflowID)
+ {
+ outflowFlagMask = flag_t(outflowFlagMask | field->getFlag(*outflowID));
+ }
+
+ // create inflowFlagMask from inflowIDs using bitwise OR
+ inflowFlagMask = 0;
+ for (auto inflowID = inflowIDs.begin(); inflowID != inflowIDs.end(); ++inflowID)
+ {
+ inflowFlagMask = flag_t(inflowFlagMask | field->getFlag(*inflowID));
+ }
+
+ // create freeSlipFlagMask from freeSlipIDs using bitwise OR
+ freeSlipFlagMask = 0;
+ for (auto freeSlipID = freeSlipIDs.begin(); freeSlipID != freeSlipIDs.end(); ++freeSlipID)
+ {
+ freeSlipFlagMask = flag_t(freeSlipFlagMask | field->getFlag(*freeSlipID));
+ }
+}
+
+template< typename FlagField_T >
+FlagInfo< FlagField_T >::FlagInfo(const Set< field::FlagUID >& obstacleIDs, const Set< field::FlagUID >& outflowIDs,
+ const Set< field::FlagUID >& inflowIDs, const Set< field::FlagUID >& freeSlipIDs)
+ : obstacleIDs_(obstacleIDs), outflowIDs_(outflowIDs), inflowIDs_(inflowIDs), freeSlipIDs_(freeSlipIDs)
+{
+ // define flags
+ flag_t nextFreeBit = flag_t(0);
+ interfaceFlag = flag_t(flag_t(1) << nextFreeBit++); // outermost flag_t is necessary to avoid warning C4334 on MSVC
+ liquidFlag = flag_t(flag_t(1) << nextFreeBit++);
+ gasFlag = flag_t(flag_t(1) << nextFreeBit++);
+ convertedFlag = flag_t(flag_t(1) << nextFreeBit++);
+ convertToGasFlag = flag_t(flag_t(1) << nextFreeBit++);
+ convertToLiquidFlag = flag_t(flag_t(1) << nextFreeBit++);
+ convertFromGasToInterfaceFlag = flag_t(flag_t(1) << nextFreeBit++);
+ keepInterfaceForWettingFlag = flag_t(flag_t(1) << nextFreeBit++);
+ convertToInterfaceForInflowFlag = flag_t(flag_t(1) << nextFreeBit++);
+
+ obstacleFlagMask = flag_t(0);
+ outflowFlagMask = flag_t(0);
+ inflowFlagMask = flag_t(0);
+ freeSlipFlagMask = flag_t(0);
+
+ // define flags for obstacles, outflow, inflow and freeSlip
+ auto setUnion = obstacleIDs + outflowIDs + inflowIDs + freeSlipIDs;
+ for (auto id = setUnion.begin(); id != setUnion.end(); ++id)
+ {
+ if (obstacleIDs.contains(*id)) { obstacleFlagMask = obstacleFlagMask | flag_t((flag_t(1) << nextFreeBit)); }
+
+ if (outflowIDs.contains(*id)) { outflowFlagMask = outflowFlagMask | flag_t((flag_t(1) << nextFreeBit)); }
+
+ if (inflowIDs.contains(*id)) { inflowFlagMask = inflowFlagMask | flag_t((flag_t(1) << nextFreeBit)); }
+
+ if (freeSlipIDs.contains(*id)) { freeSlipFlagMask = freeSlipFlagMask | flag_t((flag_t(1) << nextFreeBit)); }
+
+ nextFreeBit++;
+ }
+}
+
+template< typename FlagField_T >
+void FlagInfo< FlagField_T >::registerFlags(FlagField_T* field, const Set< field::FlagUID >& obstacleIDs,
+ const Set< field::FlagUID >& outflowIDs,
+ const Set< field::FlagUID >& inflowIDs,
+ const Set< field::FlagUID >& freeSlipIDs)
+{
+ flag_t nextFreeBit = flag_t(0);
+ field->registerFlag(flagIDs::interfaceFlagID, nextFreeBit++);
+ field->registerFlag(flagIDs::liquidFlagID, nextFreeBit++);
+ field->registerFlag(flagIDs::gasFlagID, nextFreeBit++);
+ field->registerFlag(flagIDs::convertedFlagID, nextFreeBit++);
+ field->registerFlag(flagIDs::convertToGasFlagID, nextFreeBit++);
+ field->registerFlag(flagIDs::convertToLiquidFlagID, nextFreeBit++);
+ field->registerFlag(flagIDs::convertedFromGasToInterfaceFlagID, nextFreeBit++);
+ field->registerFlag(flagIDs::keepInterfaceForWettingFlagID, nextFreeBit++);
+ field->registerFlag(flagIDs::convertToInterfaceForInflowFlagID, nextFreeBit++);
+
+ // extract flags
+ auto setUnion = obstacleIDs + outflowIDs + inflowIDs + freeSlipIDs;
+ for (auto id = setUnion.begin(); id != setUnion.end(); ++id)
+ {
+ field->registerFlag(*id, nextFreeBit++);
+ }
+}
+
+template< typename FlagField_T >
+void FlagInfo< FlagField_T >::registerFlags(FlagField_T* field) const
+{
+ registerFlags(field, obstacleIDs_, outflowIDs_, inflowIDs_, freeSlipIDs_);
+}
+
+template< typename FlagField_T >
+bool FlagInfo< FlagField_T >::isConsistentAcrossBlocksAndProcesses(
+ const std::weak_ptr< StructuredBlockStorage >& blockStoragePtr, ConstBlockDataID flagFieldID) const
+{
+ // check consistency across processes
+ FlagInfo rootFlagInfo = *this;
+
+ // root broadcasts its FlagInfo to all other processes
+ mpi::broadcastObject(rootFlagInfo);
+
+ // this process' FlagInfo is not identical to the one of root
+ if (rootFlagInfo != *this) { return false; }
+
+ auto blockStorage = blockStoragePtr.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockStorage);
+
+ // check consistency across blocks
+ for (auto blockIt = blockStorage->begin(); blockIt != blockStorage->end(); ++blockIt)
+ {
+ const FlagField_T* const flagField = blockIt->getData< const FlagField_T >(flagFieldID);
+ FlagInfo fi(flagField, obstacleIDs_, outflowIDs_, inflowIDs_, freeSlipIDs_);
+ if (fi != *this) { return false; }
+ }
+
+ return true;
+}
+
+template< typename FlagField_T >
+bool FlagInfo< FlagField_T >::operator==(const FlagInfo& o) const
+{
+ return interfaceFlag == o.interfaceFlag && gasFlag == o.gasFlag && liquidFlag == o.liquidFlag &&
+ convertToGasFlag == o.convertToGasFlag && convertToLiquidFlag == o.convertToLiquidFlag &&
+ convertFromGasToInterfaceFlag == o.convertFromGasToInterfaceFlag &&
+ keepInterfaceForWettingFlag == o.keepInterfaceForWettingFlag &&
+ convertToInterfaceForInflowFlag == o.convertToInterfaceForInflowFlag &&
+ obstacleFlagMask == o.obstacleFlagMask && outflowFlagMask == o.outflowFlagMask &&
+ inflowFlagMask == o.inflowFlagMask && freeSlipFlagMask == o.freeSlipFlagMask;
+}
+
+template< typename FlagField_T >
+bool FlagInfo< FlagField_T >::operator!=(const FlagInfo& o) const
+{
+ return !(*this == o);
+}
+
+} // namespace free_surface
+} // namespace walberla
\ No newline at end of file
diff --git a/src/lbm/free_surface/InitFunctions.h b/src/lbm/free_surface/InitFunctions.h
new file mode 100644
index 0000000000000000000000000000000000000000..b98f55d54dbb411fa877e2a95690265fb6b4c80f
--- /dev/null
+++ b/src/lbm/free_surface/InitFunctions.h
@@ -0,0 +1,229 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file InitFunctions.h
+//! \ingroup free_surface
+//! \author Matthias Markl <matthias.markl@fau.de>
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Initialization functions.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "blockforest/StructuredBlockForest.h"
+
+#include "domain_decomposition/BlockDataID.h"
+
+#include <functional>
+
+#include "FlagInfo.h"
+#include "InterfaceFromFillLevel.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Initialize fill level with "value" in cells belonging to boundary and obstacles such that the bubble model does not
+ * detect obstacles as gas cells.
+ **********************************************************************************************************************/
+template< typename BoundaryHandling_T, typename Stencil_T, typename ScalarField_T >
+void initFillLevelsInBoundaries(const std::weak_ptr< StructuredBlockForest >& blockForestPtr,
+ const ConstBlockDataID& handlingID, const BlockDataID& fillFieldID,
+ real_t value = real_c(1))
+{
+ const auto blockForest = blockForestPtr.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ ScalarField_T* const fillField = blockIt->getData< ScalarField_T >(fillFieldID);
+ const BoundaryHandling_T* const handling = blockIt->getData< const BoundaryHandling_T >(handlingID);
+
+ // set fill level to "value" in every cell belonging to boundary
+ WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ(fillField, {
+ if (handling->isBoundary(x, y, z)) { fillField->get(x, y, z) = value; }
+ }) // WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ
+ }
+}
+
+/***********************************************************************************************************************
+ * Clear and initialize flags in every cell according to the fill level.
+ **********************************************************************************************************************/
+template< typename BoundaryHandling_T, typename Stencil_T, typename FlagField_T, typename ScalarField_T >
+void initFlagsFromFillLevels(const std::weak_ptr< StructuredBlockForest >& blockForestPtr,
+ const FlagInfo< FlagField_T >& flagInfo, const BlockDataID& handlingID,
+ const ConstBlockDataID& fillFieldID)
+{
+ const auto blockForest = blockForestPtr.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ const ScalarField_T* const fillField = blockIt->getData< const ScalarField_T >(fillFieldID);
+ BoundaryHandling_T* const handling = blockIt->getData< BoundaryHandling_T >(handlingID);
+
+ // clear all flags in the boundary handling
+ handling->removeFlag(flagInfo.gasFlag);
+ handling->removeFlag(flagInfo.liquidFlag);
+ handling->removeFlag(flagInfo.interfaceFlag);
+
+ WALBERLA_FOR_ALL_CELLS(fillFieldIt, fillField, {
+ // set flags only in non-boundary and non-obstacle cells
+ if (!handling->isBoundary(fillFieldIt.x(), fillFieldIt.y(), fillFieldIt.z()))
+ {
+ if (*fillFieldIt <= real_c(0))
+ {
+ // set gas flag
+ handling->forceFlag(flagInfo.gasFlag, fillFieldIt.x(), fillFieldIt.y(), fillFieldIt.z());
+ }
+ else
+ {
+ if (*fillFieldIt < real_c(1.0))
+ {
+ // set interface flag
+ handling->forceFlag(flagInfo.interfaceFlag, fillFieldIt.x(), fillFieldIt.y(), fillFieldIt.z());
+ }
+ else
+ {
+ // check if the cell is an interface cell due to direct neighboring gas cells
+ if (isInterfaceFromFillLevel< Stencil_T >(fillFieldIt))
+ {
+ // set interface flag
+ handling->forceFlag(flagInfo.interfaceFlag, fillFieldIt.x(), fillFieldIt.y(), fillFieldIt.z());
+ }
+ else
+ {
+ // set liquid flag
+ handling->forceFlag(flagInfo.liquidFlag, fillFieldIt.x(), fillFieldIt.y(), fillFieldIt.z());
+ }
+ }
+ }
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+}
+
+/***********************************************************************************************************************
+ * Initialize the hydrostatic pressure in the direction in which a force is acting in ALL cells (regardless of a cell's
+ * flag). The velocity remains unchanged.
+ *
+ * The force vector must have only one component, i.e., the direction of the force can only be in x-, y- or z-axis.
+ * The variable fluidHeight determines the height at which the density is equal to reference density (=1).
+ **********************************************************************************************************************/
+template< typename PdfField_T >
+void initHydrostaticPressure(const std::weak_ptr< StructuredBlockForest >& blockForestPtr,
+ const BlockDataID& pdfFieldID, const Vector3< real_t >& force, real_t fluidHeight)
+{
+ // count number of non-zero components of the force vector
+ uint_t numForceComponents = uint_c(0);
+ if (!realIsEqual(force[0], real_c(0), real_c(1e-14))) { ++numForceComponents; }
+ if (!realIsEqual(force[1], real_c(0), real_c(1e-14))) { ++numForceComponents; }
+ if (!realIsEqual(force[2], real_c(0), real_c(1e-14))) { ++numForceComponents; }
+
+ WALBERLA_CHECK_EQUAL(numForceComponents, uint_c(1),
+ "The current implementation of the hydrostatic pressure initialization does not support "
+ "forces that have none or multiple components, i. e., a force that points in a direction other "
+ "than the x-, y- or z-axis.");
+
+ const auto blockForest = blockForestPtr.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ PdfField_T* const pdfField = blockIt->getData< PdfField_T >(pdfFieldID);
+
+ CellInterval local = pdfField->xyzSizeWithGhostLayer(); // block-, i.e., process-local cell interval
+
+ for (auto cellIt = local.begin(); cellIt != local.end(); ++cellIt)
+ {
+ // transform the block-local coordinate to global coordinates
+ Cell global;
+ blockForest->transformBlockLocalToGlobalCell(global, *blockIt, *cellIt);
+
+ // get the current global coordinate, i.e., height of the fluid in the relevant direction
+ cell_idx_t coordinate = cell_idx_c(0);
+ real_t forceComponent = real_c(0);
+ if (!realIsEqual(force[0], real_c(0), real_c(1e-14)))
+ {
+ coordinate = global.x();
+ forceComponent = force[0];
+ }
+ else
+ {
+ if (!realIsEqual(force[1], real_c(0), real_c(1e-14)))
+ {
+ coordinate = global.y();
+ forceComponent = force[1];
+ }
+ else
+ {
+ if (!realIsEqual(force[2], real_c(0), real_c(1e-14)))
+ {
+ coordinate = global.z();
+ forceComponent = force[2];
+ }
+ else
+ {
+ WALBERLA_ABORT(
+ "The current implementation of the hydrostatic pressure initialization does not support "
+ "forces that have none or multiple components, i. e., a force that points in a direction other "
+ "than the x-, y- or z-axis.")
+ }
+ }
+ }
+
+ // initialize the (hydrostatic) pressure, i.e., LBM density
+ // Bernoulli: p = p0 + density * gravity * height
+ // => LBM (density=1): rho = rho0 + gravity * height = 1 + 1/cs^2 * g * h = 1 + 3 * g * h
+ // shift global cell by 0.5 since density is set for cell center
+ const real_t rho =
+ real_c(1) + real_c(3) * forceComponent * (real_c(coordinate) + real_c(0.5) - std::ceil(fluidHeight));
+
+ const Vector3< real_t > velocity = pdfField->getVelocity(*cellIt);
+
+ pdfField->setDensityAndVelocity(*cellIt, velocity, rho);
+ }
+ }
+}
+
+/***********************************************************************************************************************
+ * Set density in non-liquid and non-interface cells to 1.
+ **********************************************************************************************************************/
+template< typename FlagField_T, typename PdfField_T >
+void setDensityInNonFluidCellsToOne(const std::weak_ptr< StructuredBlockForest >& blockForestPtr,
+ const FlagInfo< FlagField_T >& flagInfo, const ConstBlockDataID& flagFieldID,
+ const BlockDataID& pdfFieldID)
+{
+ const auto blockForest = blockForestPtr.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ PdfField_T* const pdfField = blockIt->getData< PdfField_T >(pdfFieldID);
+ const FlagField_T* const flagField = blockIt->getData< const FlagField_T >(flagFieldID);
+
+ WALBERLA_FOR_ALL_CELLS(pdfFieldIt, pdfField, flagFieldIt, flagField, {
+ if (!flagInfo.isLiquid(*flagFieldIt) && !flagInfo.isInterface(*flagFieldIt))
+ {
+ // set density in gas cells to 1
+ pdfField->setDensityAndVelocity(pdfFieldIt.cell(), Vector3< real_t >(real_c(0)), real_c(1));
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+}
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/InterfaceFromFillLevel.h b/src/lbm/free_surface/InterfaceFromFillLevel.h
new file mode 100644
index 0000000000000000000000000000000000000000..ef113e327032695d73df64109f0581c3b03cc4bd
--- /dev/null
+++ b/src/lbm/free_surface/InterfaceFromFillLevel.h
@@ -0,0 +1,78 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file InterfaceFromFillLevel.h
+//! \ingroup free_surface
+//! \author Matthias Markl <matthias.markl@fau.de>
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Check whether a cell should be an interface cell according to its properties.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/cell/Cell.h"
+
+#include <type_traits>
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Check whether a cell is an interface cell with respect to its fill level and its direct neighborhood (liquid cells
+ * can not have gas cell in their direct neighborhood; therefore, the liquid cell is forced to be an interface cell).
+ **********************************************************************************************************************/
+template< typename Stencil_T, typename ScalarField_T >
+inline bool isInterfaceFromFillLevel(const ScalarField_T& fillField, cell_idx_t x, cell_idx_t y, cell_idx_t z)
+{
+ WALBERLA_ASSERT(std::is_floating_point< typename ScalarField_T::value_type >::value,
+ "Fill level field must contain floating point values.")
+
+ real_t fillLevel = fillField.get(x, y, z);
+
+ // this cell is regular gas cell
+ if (fillLevel <= real_c(0.0)) { return false; }
+
+ // this cell is regular interface cell
+ if (fillLevel < real_c(1.0)) { return true; }
+
+ // check this cell's direct neighborhood for gas cells (a liquid cell can not be direct neighbor to a gas cell)
+ for (auto d = Stencil_T::beginNoCenter(); d != Stencil_T::end(); ++d)
+ {
+ // this cell has a gas cell in its direct neighborhood; it therefore must not be a liquid cell but an interface
+ // cell although its fill level is 1.0
+ if (fillField.get(x + d.cx(), y + d.cy(), z + d.cz()) <= real_c(0.0)) { return true; }
+ }
+
+ // this cell is a regular fluid cell
+ return false;
+}
+
+template< typename Stencil_T, typename ScalarFieldIt_T >
+inline bool isInterfaceFromFillLevel(const ScalarFieldIt_T& fillFieldIt)
+{
+ return isInterfaceFromFillLevel< Stencil_T, typename ScalarFieldIt_T::FieldType >(
+ *(fillFieldIt.getField()), fillFieldIt.x(), fillFieldIt.y(), fillFieldIt.z());
+}
+
+template< typename Stencil_T, typename ScalarField >
+inline bool isInterfaceFromFillLevel(const ScalarField& fillField, const Cell& cell)
+{
+ return isInterfaceFromFillLevel< Stencil_T >(fillField, cell.x(), cell.y(), cell.z());
+}
+
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/LoadBalancing.h b/src/lbm/free_surface/LoadBalancing.h
new file mode 100644
index 0000000000000000000000000000000000000000..c9df54478e5c4af223f0be17fe128f86427f21ed
--- /dev/null
+++ b/src/lbm/free_surface/LoadBalancing.h
@@ -0,0 +1,345 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file LoadBalancing.h
+//! \ingroup free_surface
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Free surface-specific functionality for load balancing.
+//
+//======================================================================================================================
+
+#include "blockforest/BlockForest.h"
+#include "blockforest/SetupBlockForest.h"
+#include "blockforest/StructuredBlockForest.h"
+#include "blockforest/loadbalancing/DynamicCurve.h"
+#include "blockforest/loadbalancing/StaticCurve.h"
+
+#include "core/logging/Logging.h"
+#include "core/math/AABB.h"
+#include "core/math/DistributedSample.h"
+#include "core/math/Vector3.h"
+#include "core/mpi/MPIManager.h"
+
+#include "lbm/blockforest/communication/SimpleCommunication.h"
+#include "lbm/free_surface/BlockStateDetectorSweep.h"
+#include "lbm/free_surface/bubble_model/BubbleModel.h"
+
+#include <algorithm>
+#include <numeric>
+
+namespace walberla
+{
+namespace free_surface
+{
+
+template< typename FlagField_T >
+class ProcessLoadEvaluator;
+
+/***********************************************************************************************************************
+ * Create non-uniform block forest to be used for load balancing.
+ **********************************************************************************************************************/
+std::shared_ptr< StructuredBlockForest > createNonUniformBlockForest(const Vector3< uint_t >& domainSize,
+ const Vector3< uint_t >& cellsPerBlock,
+ const Vector3< uint_t >& numBlocks,
+ const Vector3< bool >& periodicity)
+{
+ WALBERLA_CHECK_EQUAL(domainSize[0], cellsPerBlock[0] * numBlocks[0],
+ "The domain size is not divisible by the specified \"cellsPerBlock\" in x-direction.");
+ WALBERLA_CHECK_EQUAL(domainSize[1], cellsPerBlock[1] * numBlocks[1],
+ "The domain size is not divisible by the specified \"cellsPerBlock\" in y-direction.");
+ WALBERLA_CHECK_EQUAL(domainSize[2], cellsPerBlock[2] * numBlocks[2],
+ "The domain size is not divisible by the specified \"cellsPerBlock\" in z-direction.");
+
+ // create SetupBlockForest for allowing load balancing
+ SetupBlockForest setupBlockForest;
+
+ AABB domainAABB(real_c(0), real_c(0), real_c(0), real_c(domainSize[0]), real_c(domainSize[1]),
+ real_c(domainSize[2]));
+
+ setupBlockForest.init(domainAABB, numBlocks[0], numBlocks[1], numBlocks[2], periodicity[0], periodicity[1],
+ periodicity[2]);
+
+ // compute initial process distribution
+ setupBlockForest.balanceLoad(blockforest::StaticLevelwiseCurveBalance(true),
+ uint_c(MPIManager::instance()->numProcesses()));
+
+ WALBERLA_LOG_INFO_ON_ROOT(setupBlockForest);
+
+ // define MPI communicator
+ if (!MPIManager::instance()->rankValid()) { MPIManager::instance()->useWorldComm(); }
+
+ // create BlockForest (will be encapsulated in StructuredBlockForest)
+ const std::shared_ptr< BlockForest > blockForest =
+ std::make_shared< BlockForest >(uint_c(MPIManager::instance()->rank()), setupBlockForest, false);
+
+ // create StructuredBlockForest
+ std::shared_ptr< StructuredBlockForest > structuredBlockForest =
+ std::make_shared< StructuredBlockForest >(blockForest, cellsPerBlock[0], cellsPerBlock[1], cellsPerBlock[2]);
+ structuredBlockForest->createCellBoundingBoxes();
+
+ return structuredBlockForest;
+}
+
+/***********************************************************************************************************************
+ * Example for a load balancing implementation.
+ *
+ * IMPORTANT REMARK: The following implementation should be considered a demonstrator based on best-practices. That is,
+ * it was not thoroughly benchmarked and does not guarantee a performance-optimal load balancing.
+ **********************************************************************************************************************/
+template< typename FlagField_T, typename CommunicationStencil_T, typename LatticeModelStencil_T >
+class LoadBalancer
+{
+ public:
+ LoadBalancer(const std::shared_ptr< StructuredBlockForest >& blockForestPtr,
+ const blockforest::SimpleCommunication< CommunicationStencil_T >& communication,
+ const blockforest::SimpleCommunication< LatticeModelStencil_T >& pdfCommunication,
+ const std::shared_ptr< bubble_model::BubbleModelBase >& bubbleModel, uint_t blockWeightFullFreeSurface,
+ uint_t blockWeightOnlyLBM, uint_t blockWeightOnlyGasAndBoundary, uint_t frequency,
+ bool printStatistics = false)
+ : blockForest_(blockForestPtr), communication_(communication), pdfCommunication_(pdfCommunication),
+ bubbleModel_(bubbleModel), blockWeightFullFreeSurface_(blockWeightFullFreeSurface),
+ blockWeightOnlyLBM_(blockWeightOnlyLBM), blockWeightOnlyGasAndBoundary_(blockWeightOnlyGasAndBoundary),
+ frequency_(frequency), printStatistics_(printStatistics), executionCounter_(uint_c(0)),
+ evaluator_(ProcessLoadEvaluator< FlagField_T >(blockForest_, blockWeightFullFreeSurface_, blockWeightOnlyLBM_,
+ blockWeightOnlyGasAndBoundary_, uint_c(1)))
+ {
+ BlockForest& blockForest = blockForest_->getBlockForest();
+
+ // refinement is not implemented in FSLBM such that this can be set to false
+ blockForest.recalculateBlockLevelsInRefresh(false);
+
+ // rebalancing of blocks must be forced here, as it would normally be done when refinement levels change
+ blockForest.alwaysRebalanceInRefresh(true);
+
+ // depth of levels is not changing and must therefore not be communicated
+ blockForest.allowRefreshChangingDepth(false);
+
+ // refinement is not implemented in FSLBM such that this can be set to false
+ blockForest.allowMultipleRefreshCycles(false);
+
+ // leave algorithm when load balancing has been performed
+ blockForest.checkForEarlyOutAfterLoadBalancing(true);
+
+ // use PhantomWeight as defined below
+ blockForest.setRefreshPhantomBlockDataAssignmentFunction(blockWeightAssignment);
+ blockForest.setRefreshPhantomBlockDataPackFunction(phantomWeightsPack);
+ blockForest.setRefreshPhantomBlockDataUnpackFunction(phantomWeightsUnpack);
+
+ // assign load balancing function
+ blockForest.setRefreshPhantomBlockMigrationPreparationFunction(
+ blockforest::DynamicCurveBalance< PhantomWeight >(true, true));
+ }
+
+ void operator()()
+ {
+ if (frequency_ == uint_c(0)) { return; }
+
+ // only balance load in given frequencies
+ if (executionCounter_ % frequency_ == uint_c(0))
+ {
+ BlockForest& blockForest = blockForest_->getBlockForest();
+
+ // balance load by updating the blockForest
+ const uint_t modificationStamp = blockForest.getModificationStamp();
+ blockForest.refresh();
+
+ const uint_t newModificationStamp = blockForest.getModificationStamp();
+
+ if (newModificationStamp != modificationStamp)
+ {
+ // communicate all fields
+ communication_();
+ pdfCommunication_();
+ bubbleModel_->update();
+
+ if (printStatistics_) { evaluator_(); }
+
+ if (blockForest.getNumberOfBlocks() == uint_c(0))
+ {
+ WALBERLA_ABORT(
+ "Load balancing lead to a situation where there is a process with no blocks. This is "
+ "not supported yet. This can be avoided by either using smaller blocks or, equivalently, more blocks "
+ "per process.");
+ }
+ }
+ }
+ ++executionCounter_;
+ }
+
+ private:
+ std::shared_ptr< StructuredBlockForest > blockForest_;
+ blockforest::SimpleCommunication< CommunicationStencil_T > communication_;
+ blockforest::SimpleCommunication< LatticeModelStencil_T > pdfCommunication_;
+ std::shared_ptr< bubble_model::BubbleModelBase > bubbleModel_;
+
+ uint_t blockWeightFullFreeSurface_; // empirical choice, not thoroughly benchmarked: 50
+ uint_t blockWeightOnlyLBM_; // empirical choice, not thoroughly benchmarked: 10
+ uint_t blockWeightOnlyGasAndBoundary_; // empirical choice, not thoroughly benchmarked: 5
+
+ uint_t frequency_;
+ bool printStatistics_;
+
+ uint_t executionCounter_;
+
+ ProcessLoadEvaluator< FlagField_T > evaluator_;
+
+ class PhantomWeight // used as a 'PhantomBlockForest::PhantomBlockDataAssignmentFunction'
+ {
+ public:
+ using weight_t = uint_t;
+ PhantomWeight(const weight_t _weight) : weight_(_weight) {}
+ weight_t weight() const { return weight_; }
+
+ private:
+ weight_t weight_;
+ }; // class PhantomWeight
+
+ std::function< void(mpi::SendBuffer& buffer, const PhantomBlock& block) > phantomWeightsPack =
+ [](mpi::SendBuffer& buffer, const PhantomBlock& block) { buffer << block.getData< PhantomWeight >().weight(); };
+
+ std::function< void(mpi::RecvBuffer& buffer, const PhantomBlock&, walberla::any& data) > phantomWeightsUnpack =
+ [](mpi::RecvBuffer& buffer, const PhantomBlock&, walberla::any& data) {
+ typename PhantomWeight::weight_t w;
+ buffer >> w;
+ data = PhantomWeight(w);
+ };
+
+ std::function< void(std::vector< std::pair< const PhantomBlock*, walberla::any > >& blockData,
+ const PhantomBlockForest&) >
+ blockWeightAssignment =
+ [this](std::vector< std::pair< const PhantomBlock*, walberla::any > >& blockData, const PhantomBlockForest&) {
+ for (auto it = blockData.begin(); it != blockData.end(); ++it)
+ {
+ if (it->first->getState().contains(BlockStateDetectorSweep< FlagField_T >::fullFreeSurface))
+ {
+ it->second = PhantomWeight(blockWeightFullFreeSurface_);
+ }
+ else
+ {
+ if (it->first->getState().contains(BlockStateDetectorSweep< FlagField_T >::onlyLBM))
+ {
+ it->second = PhantomWeight(blockWeightOnlyLBM_);
+ }
+ else
+ {
+ if (it->first->getState().contains(BlockStateDetectorSweep< FlagField_T >::onlyGasAndBoundary))
+ {
+ it->second = PhantomWeight(blockWeightOnlyGasAndBoundary_);
+ }
+ else { WALBERLA_ABORT("Unknown block state"); }
+ }
+ }
+ }
+ };
+
+}; // class LoadBalancer
+
+/***********************************************************************************************************************
+ * Evaluates and prints statistics about the current load distribution situation:
+ * - Average weight per process
+ * - Maximum weight per process
+ * - Minimum weight per process
+ **********************************************************************************************************************/
+template< typename FlagField_T >
+class ProcessLoadEvaluator
+{
+ public:
+ ProcessLoadEvaluator(const std::weak_ptr< const StructuredBlockForest >& blockForest,
+ uint_t blockWeightFullFreeSurface, uint_t blockWeightOnlyLBM,
+ uint_t blockWeightOnlyGasAndBoundary, uint_t frequency)
+ : blockForest_(blockForest), blockWeightFullFreeSurface_(blockWeightFullFreeSurface),
+ blockWeightOnlyLBM_(blockWeightOnlyLBM), blockWeightOnlyGasAndBoundary_(blockWeightOnlyGasAndBoundary),
+ frequency_(frequency), executionCounter_(uint_c(0))
+ {}
+
+ void operator()()
+ {
+ if (frequency_ == uint_c(0)) { return; }
+
+ ++executionCounter_;
+
+ // only evaluate in given intervals
+ if (executionCounter_ % frequency_ != uint_c(0) && executionCounter_ != uint_c(1)) { return; }
+
+ std::vector< real_t > weightSum = computeWeightSumPerProcess();
+
+ print(weightSum);
+ }
+
+ std::vector< real_t > computeWeightSumPerProcess()
+ {
+ auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ std::vector< real_t > weightSum(uint_c(MPIManager::instance()->numProcesses()), real_c(0));
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ if (blockForest->blockExistsLocally(blockIt->getId()))
+ {
+ if (blockIt->getState().contains(BlockStateDetectorSweep< FlagField_T >::fullFreeSurface))
+ {
+ weightSum[blockForest->getProcessRank(blockIt->getId())] += real_c(blockWeightFullFreeSurface_);
+ }
+ else
+ {
+ if (blockIt->getState().contains(BlockStateDetectorSweep< FlagField_T >::onlyLBM))
+ {
+ weightSum[blockForest->getProcessRank(blockIt->getId())] += real_c(blockWeightOnlyLBM_);
+ }
+ else
+ {
+ if (blockIt->getState().contains(BlockStateDetectorSweep< FlagField_T >::onlyGasAndBoundary))
+ {
+ weightSum[blockForest->getProcessRank(blockIt->getId())] += real_c(blockWeightOnlyGasAndBoundary_);
+ }
+ }
+ }
+ }
+ }
+
+ mpi::reduceInplace< real_t >(weightSum, mpi::SUM, 0);
+
+ return weightSum;
+ }
+
+ void print(const std::vector< real_t >& weightSum)
+ {
+ WALBERLA_ROOT_SECTION()
+ {
+ const std::vector< real_t >::const_iterator max = std::max_element(weightSum.cbegin(), weightSum.end());
+ const std::vector< real_t >::const_iterator min = std::min_element(weightSum.cbegin(), weightSum.end());
+ const real_t sum = std::accumulate(weightSum.cbegin(), weightSum.end(), real_c(0));
+ const real_t avg = sum / real_c(MPIManager::instance()->numProcesses());
+
+ WALBERLA_LOG_INFO("Load balancing:");
+ WALBERLA_LOG_INFO("\t Average weight per process " << avg);
+ WALBERLA_LOG_INFO("\t Maximum weight per process " << *max);
+ WALBERLA_LOG_INFO("\t Minimum weight per process " << *min);
+ }
+ }
+
+ private:
+ std::weak_ptr< const StructuredBlockForest > blockForest_;
+ uint_t blockWeightFullFreeSurface_;
+ uint_t blockWeightOnlyLBM_;
+ uint_t blockWeightOnlyGasAndBoundary_;
+
+ uint_t frequency_;
+ uint_t executionCounter_;
+}; // class ProcessLoadEvaluator
+
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/MaxVelocityComputer.h b/src/lbm/free_surface/MaxVelocityComputer.h
new file mode 100644
index 0000000000000000000000000000000000000000..a3e2b0cb287e1a9ad427869047a0404eafd89ce1
--- /dev/null
+++ b/src/lbm/free_surface/MaxVelocityComputer.h
@@ -0,0 +1,110 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file MaxVelocityComputer.h
+//! \ingroup free_surface
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Compute the maximum velocity in the system.
+//
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+template< typename FreeSurfaceBoundaryHandling_T, typename PdfField_T, typename FlagField_T >
+class MaxVelocityComputer
+{
+ public:
+ MaxVelocityComputer(const std::weak_ptr< const StructuredBlockForest >& blockForest,
+ const std::weak_ptr< const FreeSurfaceBoundaryHandling_T >& freeSurfaceBoundaryHandling,
+ const ConstBlockDataID& pdfFieldID, uint_t frequency,
+ const std::shared_ptr< Vector3< real_t > >& maxVelocity)
+ : blockForest_(blockForest), freeSurfaceBoundaryHandling_(freeSurfaceBoundaryHandling), pdfFieldID_(pdfFieldID),
+ maxVelocity_(maxVelocity), frequency_(frequency), executionCounter_(uint_c(0))
+ {}
+
+ void operator()()
+ {
+ if (frequency_ == uint_c(0)) { return; }
+
+ auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ auto freeSurfaceBoundaryHandling = freeSurfaceBoundaryHandling_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(freeSurfaceBoundaryHandling);
+
+ if (executionCounter_ == uint_c(0)) { getMaxVelocity(blockForest, freeSurfaceBoundaryHandling); }
+ else
+ {
+ // only evaluate in given frequencies
+ if (executionCounter_ % frequency_ == uint_c(0)) { getMaxVelocity(blockForest, freeSurfaceBoundaryHandling); }
+ }
+
+ ++executionCounter_;
+ }
+
+ void getMaxVelocity(const std::shared_ptr< const StructuredBlockForest >& blockForest,
+ const std::shared_ptr< const FreeSurfaceBoundaryHandling_T >& freeSurfaceBoundaryHandling)
+ {
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ Vector3< real_t > maxVelocity = Vector3< real_t >(real_c(0));
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ const FlagField_T* const flagField = blockIt->template getData< const FlagField_T >(flagFieldID);
+ const PdfField_T* const pdfField = blockIt->template getData< const PdfField_T >(pdfFieldID_);
+
+ WALBERLA_FOR_ALL_CELLS_OMP(flagFieldIt, flagField, pdfFieldIt, pdfField,
+ omp parallel for schedule(static) reduction(max:maxVelocity[0]) reduction(max:maxVelocity[1]) reduction(max:maxVelocity[2]),
+ {
+ if (flagInfo.isLiquid(flagFieldIt) || flagInfo.isInterface(flagFieldIt))
+ {
+ const Vector3< real_t > velocity = pdfField->getVelocity(pdfFieldIt.cell());
+
+ if (velocity[0] > maxVelocity[0]) { maxVelocity[0] = velocity[0]; }
+ if (velocity[1] > maxVelocity[1]) { maxVelocity[1] = velocity[1]; }
+ if (velocity[2] > maxVelocity[2]) { maxVelocity[2] = velocity[2]; }
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_OMP
+ }
+
+ mpi::allReduceInplace< real_t >(maxVelocity[0], mpi::MAX);
+ mpi::allReduceInplace< real_t >(maxVelocity[1], mpi::MAX);
+ mpi::allReduceInplace< real_t >(maxVelocity[2], mpi::MAX);
+
+ *maxVelocity_ = maxVelocity;
+ };
+
+ private:
+ std::weak_ptr< const StructuredBlockForest > blockForest_;
+ std::weak_ptr< const FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling_;
+
+ const ConstBlockDataID pdfFieldID_;
+
+ std::shared_ptr< Vector3< real_t > > maxVelocity_;
+
+ uint_t frequency_;
+ uint_t executionCounter_;
+}; // class MaxVelocityComputer
+
+} // namespace free_surface
+} // namespace walberla
\ No newline at end of file
diff --git a/src/lbm/free_surface/SurfaceMeshWriter.h b/src/lbm/free_surface/SurfaceMeshWriter.h
new file mode 100644
index 0000000000000000000000000000000000000000..334f9d714d2e3dc3f6eb4a465aa9f3606a775a22
--- /dev/null
+++ b/src/lbm/free_surface/SurfaceMeshWriter.h
@@ -0,0 +1,176 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file SurfaceMeshWriter.h
+//! \ingroup free_surface
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Free surface-specific class for writing the free surface as triangle mesh.
+//
+//======================================================================================================================
+
+#include "blockforest/StructuredBlockForest.h"
+
+#include "core/Filesystem.h"
+
+#include "field/AddToStorage.h"
+
+#include "geometry/mesh/TriangleMeshIO.h"
+
+#include "postprocessing/FieldToSurfaceMesh.h"
+
+#include "timeloop/SweepTimeloop.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace abortIfNullptr
+{
+
+// helper function to check validity of std::weak_ptr in constructors' initializer list; WALBERLA_CHECK_NOT_NULLPTR()
+// does not work there, because the macro terminates with ";"
+template< typename T >
+void abortIfNullptr(const std::weak_ptr< T >& weakPointer)
+{
+ if (weakPointer.lock() == nullptr) { WALBERLA_ABORT("Weak pointer has expired."); }
+}
+} // namespace abortIfNullptr
+
+/***********************************************************************************************************************
+ * Write free surface as triangle mesh.
+ *
+ * Internally, a clone of the fill level field is stored and all cells not marked as liquidInterfaceGasFlagIDSet are set
+ * to "obstacleFillLevel" in the cloned field. This is done to avoid writing e.g. obstacle cells that were possibly
+ * assigned a fill level of 1 to not make them detect as gas cells in the bubble model.
+ **********************************************************************************************************************/
+template< typename ScalarField_T, typename FlagField_T >
+class SurfaceMeshWriter
+{
+ public:
+ SurfaceMeshWriter(const std::weak_ptr< StructuredBlockForest >& blockForest, const ConstBlockDataID& fillFieldID,
+ const ConstBlockDataID& flagFieldID, const Set< FlagUID >& liquidInterfaceGasFlagIDSet,
+ real_t obstacleFillLevel, uint_t writeFrequency, const std::string& baseFolder)
+ : blockForest_(blockForest), fillFieldID_(fillFieldID), flagFieldID_(flagFieldID),
+ liquidInterfaceGasFlagIDSet_(liquidInterfaceGasFlagIDSet), obstacleFillLevel_(obstacleFillLevel),
+ writeFrequency_(writeFrequency), baseFolder_(baseFolder), executionCounter_(uint_c(0)),
+ fillFieldCloneID_(
+ (abortIfNullptr::abortIfNullptr(blockForest),
+ field::addCloneToStorage< ScalarField_T >(blockForest_.lock(), fillFieldID_, "Fill level field clone")))
+ {}
+
+ // config block must be named "MeshOutputParameters"
+ SurfaceMeshWriter(const std::weak_ptr< StructuredBlockForest >& blockForest, const ConstBlockDataID& fillFieldID,
+ const ConstBlockDataID& flagFieldID, const Set< FlagUID >& liquidInterfaceGasFlagIDSet,
+ real_t obstacleFillLevel, const std::weak_ptr< Config >& config)
+ : SurfaceMeshWriter(
+ blockForest, fillFieldID, flagFieldID, liquidInterfaceGasFlagIDSet, obstacleFillLevel,
+ (abortIfNullptr::abortIfNullptr(config),
+ config.lock()->getOneBlock("MeshOutputParameters").getParameter< uint_t >("writeFrequency")),
+ (abortIfNullptr::abortIfNullptr(config),
+ config.lock()->getOneBlock("MeshOutputParameters").getParameter< std::string >("baseFolder")))
+ {}
+
+ void operator()()
+ {
+ if (writeFrequency_ == uint_c(0)) { return; }
+
+ if (executionCounter_ == uint_c(0))
+ {
+ createBaseFolder();
+ writeMesh();
+ }
+ else { writeMesh(); }
+
+ ++executionCounter_;
+ }
+
+ private:
+ void createBaseFolder() const
+ {
+ WALBERLA_ROOT_SECTION()
+ {
+ const filesystem::path basePath(baseFolder_);
+ if (filesystem::exists(basePath)) { filesystem::remove_all(basePath); }
+ filesystem::create_directories(basePath);
+ }
+ WALBERLA_MPI_BARRIER();
+ }
+
+ void writeMesh()
+ {
+ // only write mesh in given frequency
+ if (executionCounter_ % writeFrequency_ != uint_c(0)) { return; }
+
+ // rank=0 is just an arbitrary choice here
+ const int targetRank = 0;
+
+ auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ // update clone of fill level field and set fill level of all non-liquid, -interface, or -gas cells to zero
+ updateFillFieldClone(blockForest);
+
+ const auto surfaceMesh = postprocessing::realFieldToSurfaceMesh< ScalarField_T >(
+ blockForest, fillFieldCloneID_, real_c(0.5), uint_c(0), true, targetRank, MPI_COMM_WORLD);
+
+ WALBERLA_EXCLUSIVE_WORLD_SECTION(targetRank)
+ {
+ geometry::writeMesh(baseFolder_ + "/" + "simulation_step_" + std::to_string(executionCounter_) + ".obj",
+ *surfaceMesh);
+ }
+ }
+
+ // update clone of fill level field and set fill level of all non-liquid, -interface, or -gas cells to zero;
+ // explicitly use shared_ptr instead of weak_ptr to avoid checking the latter's validity (is done in writeMesh()
+ // already)
+ void updateFillFieldClone(const shared_ptr< StructuredBlockForest >& blockForest)
+ {
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ ScalarField_T* const fillFieldClone = blockIt->template getData< ScalarField_T >(fillFieldCloneID_);
+ const ScalarField_T* const fillField = blockIt->template getData< const ScalarField_T >(fillFieldID_);
+ const FlagField_T* const flagField = blockIt->template getData< const FlagField_T >(flagFieldID_);
+
+ const auto liquidInterfaceGasFlagMask = flagField->getMask(liquidInterfaceGasFlagIDSet_);
+
+ WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ(fillFieldClone, fillField->nrOfGhostLayers(), {
+ const typename ScalarField_T::Ptr fillFieldClonePtr(*fillFieldClone, x, y, z);
+ const typename ScalarField_T::ConstPtr fillFieldPtr(*fillField, x, y, z);
+ const typename FlagField_T::ConstPtr flagFieldPtr(*flagField, x, y, z);
+
+ // set fill level to zero in every non-liquid, -interface, or -gas cell
+ if (!isPartOfMaskSet(flagFieldPtr, liquidInterfaceGasFlagMask)) { *fillFieldClonePtr = obstacleFillLevel_; }
+ else
+ {
+ // copy fill level from fill level field
+ *fillFieldClonePtr = *fillFieldPtr;
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ
+ }
+ }
+
+ std::weak_ptr< StructuredBlockForest > blockForest_;
+ ConstBlockDataID fillFieldID_;
+ ConstBlockDataID flagFieldID_;
+ Set< FlagUID > liquidInterfaceGasFlagIDSet_;
+ real_t obstacleFillLevel_;
+ uint_t writeFrequency_;
+ std::string baseFolder_;
+ uint_t executionCounter_;
+
+ BlockDataID fillFieldCloneID_;
+}; // class SurfaceMeshWriter
+} // namespace free_surface
+} // namespace walberla
\ No newline at end of file
diff --git a/src/lbm/free_surface/TotalMassComputer.h b/src/lbm/free_surface/TotalMassComputer.h
new file mode 100644
index 0000000000000000000000000000000000000000..192ec875594b98dc87bff0e1418c200544965590
--- /dev/null
+++ b/src/lbm/free_surface/TotalMassComputer.h
@@ -0,0 +1,144 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file TotalMassComputer.h
+//! \ingroup free_surface
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Compute the total mass of the system (including mass from the excessMassField).
+//
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/StringUtility.h"
+
+#include "lbm/free_surface/dynamics/SurfaceDynamicsHandler.h"
+#include "lbm/free_surface/surface_geometry/SurfaceGeometryHandler.h"
+#include "lbm/free_surface/surface_geometry/Utility.h"
+#include "lbm/lattice_model/D3Q19.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+template< typename FreeSurfaceBoundaryHandling_T, typename PdfField_T, typename FlagField_T, typename ScalarField_T >
+class TotalMassComputer
+{
+ public:
+ TotalMassComputer(const std::weak_ptr< const StructuredBlockForest >& blockForest,
+ const std::weak_ptr< const FreeSurfaceBoundaryHandling_T >& freeSurfaceBoundaryHandling,
+ const ConstBlockDataID& pdfFieldID, const ConstBlockDataID& fillFieldID, uint_t frequency,
+ const std::shared_ptr< real_t >& totalMass)
+ : blockForest_(blockForest), freeSurfaceBoundaryHandling_(freeSurfaceBoundaryHandling), pdfFieldID_(pdfFieldID),
+ fillFieldID_(fillFieldID), totalMass_(totalMass), frequency_(frequency), executionCounter_(uint_c(0))
+ {}
+
+ TotalMassComputer(const std::weak_ptr< const StructuredBlockForest >& blockForest,
+ const std::weak_ptr< const FreeSurfaceBoundaryHandling_T >& freeSurfaceBoundaryHandling,
+ const ConstBlockDataID& pdfFieldID, const ConstBlockDataID& fillFieldID,
+ const ConstBlockDataID& excessMassFieldID, uint_t frequency,
+ const std::shared_ptr< real_t >& totalMass)
+ : blockForest_(blockForest), freeSurfaceBoundaryHandling_(freeSurfaceBoundaryHandling), pdfFieldID_(pdfFieldID),
+ fillFieldID_(fillFieldID), excessMassFieldID_(excessMassFieldID), totalMass_(totalMass), frequency_(frequency),
+ executionCounter_(uint_c(0))
+ {}
+
+ void operator()()
+ {
+ if (frequency_ == uint_c(0)) { return; }
+
+ auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ auto freeSurfaceBoundaryHandling = freeSurfaceBoundaryHandling_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(freeSurfaceBoundaryHandling);
+
+ if (executionCounter_ == uint_c(0)) { computeMass(blockForest, freeSurfaceBoundaryHandling); }
+ else
+ {
+ // only evaluate in given frequencies
+ if (executionCounter_ % frequency_ == uint_c(0)) { computeMass(blockForest, freeSurfaceBoundaryHandling); }
+ }
+
+ ++executionCounter_;
+ }
+
+ void computeMass(const std::shared_ptr< const StructuredBlockForest >& blockForest,
+ const std::shared_ptr< const FreeSurfaceBoundaryHandling_T >& freeSurfaceBoundaryHandling)
+ {
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ real_t mass = real_c(0);
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ const FlagField_T* const flagField = blockIt->template getData< const FlagField_T >(flagFieldID);
+ const PdfField_T* const pdfField = blockIt->template getData< const PdfField_T >(pdfFieldID_);
+ const ScalarField_T* const fillField = blockIt->template getData< const ScalarField_T >(fillFieldID_);
+
+ // if provided, also consider mass stored in excessMassField
+ if (excessMassFieldID_ != ConstBlockDataID())
+ {
+ const ScalarField_T* const excessMassField =
+ blockIt->template getData< const ScalarField_T >(excessMassFieldID_);
+
+ WALBERLA_FOR_ALL_CELLS_OMP(flagFieldIt, flagField, pdfFieldIt, pdfField, fillFieldIt, fillField,
+ excessMassFieldIt, excessMassField,
+ omp parallel for schedule(static) reduction(+:mass),
+ {
+ if (flagInfo.isLiquid(flagFieldIt) || flagInfo.isInterface(flagFieldIt))
+ {
+ const real_t density = pdfField->getDensity(pdfFieldIt.cell());
+ mass += *fillFieldIt * density + *excessMassFieldIt;
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_OMP
+ }
+ else
+ {
+ WALBERLA_FOR_ALL_CELLS_OMP(flagFieldIt, flagField, pdfFieldIt, pdfField, fillFieldIt, fillField,
+ omp parallel for schedule(static) reduction(+:mass),
+ {
+ if (flagInfo.isLiquid(flagFieldIt) || flagInfo.isInterface(flagFieldIt))
+ {
+ const real_t density = pdfField->getDensity(pdfFieldIt.cell());
+ mass += *fillFieldIt * density;
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_OMP
+ }
+ }
+
+ mpi::allReduceInplace< real_t >(mass, mpi::SUM);
+
+ *totalMass_ = mass;
+ };
+
+ private:
+ std::weak_ptr< const StructuredBlockForest > blockForest_;
+ std::weak_ptr< const FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling_;
+
+ const ConstBlockDataID pdfFieldID_;
+ const ConstBlockDataID fillFieldID_;
+ const ConstBlockDataID excessMassFieldID_ = ConstBlockDataID();
+
+ std::shared_ptr< real_t > totalMass_;
+
+ uint_t frequency_;
+ uint_t executionCounter_;
+}; // class TotalMassComputer
+
+} // namespace free_surface
+} // namespace walberla
\ No newline at end of file
diff --git a/src/lbm/free_surface/VtkWriter.h b/src/lbm/free_surface/VtkWriter.h
new file mode 100644
index 0000000000000000000000000000000000000000..36f056740a2a566fee8e70a19ff56084f74b4b43
--- /dev/null
+++ b/src/lbm/free_surface/VtkWriter.h
@@ -0,0 +1,173 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file VtkWriter.h
+//! \ingroup free_surface
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Free surface-specific VTK writer function.
+//
+//======================================================================================================================
+
+#include "blockforest/communication/UniformBufferedScheme.h"
+
+#include "field/adaptors/AdaptorCreators.h"
+#include "field/communication/PackInfo.h"
+#include "field/vtk/FlagFieldCellFilter.h"
+#include "field/vtk/FlagFieldMapping.h"
+#include "field/vtk/VTKWriter.h"
+
+#include "lbm/field/Adaptors.h"
+
+#include "stencil/D3Q27.h"
+
+#include "timeloop/SweepTimeloop.h"
+
+#include "vtk/Initialization.h"
+
+#include "FlagInfo.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Add VTK output to time loop that includes all relevant free surface information. It must be configured via
+ * config-file.
+ **********************************************************************************************************************/
+template< typename LatticeModel_T, typename FreeSurfaceBoundaryHandling_T, typename PdfField_T, typename FlagField_T,
+ typename ScalarField_T, typename VectorField_T >
+void addVTKOutput(const std::weak_ptr< StructuredBlockForest >& blockForestPtr, SweepTimeloop& timeloop,
+ const std::weak_ptr< Config >& configPtr,
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo, const BlockDataID& pdfFieldID,
+ const BlockDataID& flagFieldID, const BlockDataID& fillFieldID, const BlockDataID& forceFieldID,
+ const BlockDataID& curvatureFieldID, const BlockDataID& normalFieldID,
+ const BlockDataID& obstacleNormalFieldID)
+{
+ const auto blockForest = blockForestPtr.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ const auto config = configPtr.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(config);
+
+ // add various adaptors (for simplified access to macroscopic quantities)
+ const BlockDataID densityAdaptorID = field::addFieldAdaptor< typename lbm::Adaptor< LatticeModel_T >::Density >(
+ blockForest, pdfFieldID, "DensityAdaptor");
+ const BlockDataID velocityAdaptorID =
+ field::addFieldAdaptor< typename lbm::Adaptor< LatticeModel_T >::VelocityVector >(blockForest, pdfFieldID,
+ "VelocityVectorAdaptor");
+ // define VTK output (see src/vtk/Initialization.cpp, line 574 for usage)
+ const auto vtkConfigFunc = [&](std::vector< std::shared_ptr< vtk::BlockCellDataWriterInterface > >& writers,
+ std::map< std::string, vtk::VTKOutput::CellFilter >& filters,
+ std::map< std::string, vtk::VTKOutput::BeforeFunction >& beforeFuncs) {
+ using field::VTKWriter;
+
+ // add fields to VTK output
+ writers.push_back(std::make_shared< VTKWriter< typename lbm::Adaptor< LatticeModel_T >::VelocityVector > >(
+ velocityAdaptorID, "velocity"));
+ writers.push_back(std::make_shared< VTKWriter< typename lbm::Adaptor< LatticeModel_T >::Density > >(
+ densityAdaptorID, "density"));
+ writers.push_back(std::make_shared< VTKWriter< PdfField_T, float > >(pdfFieldID, "pdf"));
+ writers.push_back(std::make_shared< VTKWriter< FlagField_T, float > >(flagFieldID, "flag"));
+ writers.push_back(std::make_shared< VTKWriter< ScalarField_T, float > >(fillFieldID, "fill_level"));
+ writers.push_back(std::make_shared< VTKWriter< ScalarField_T, float > >(curvatureFieldID, "curvature"));
+ writers.push_back(std::make_shared< VTKWriter< VectorField_T, float > >(normalFieldID, "normal"));
+ writers.push_back(
+ std::make_shared< VTKWriter< VectorField_T, float > >(obstacleNormalFieldID, "obstacle_normal"));
+ writers.push_back(std::make_shared< VTKWriter< VectorField_T, float > >(forceFieldID, "force"));
+
+ // map flagIDs to integer values
+ const auto flagMapper =
+ std::make_shared< field::FlagFieldMapping< FlagField_T, walberla::uint_t > >(flagFieldID, "mapped_flag");
+ flagMapper->addMapping(flagIDs::liquidFlagID, uint_c(1));
+ flagMapper->addMapping(flagIDs::interfaceFlagID, uint_c(2));
+ flagMapper->addMapping(flagIDs::gasFlagID, uint_c(3));
+ flagMapper->addMapping(FreeSurfaceBoundaryHandling_T::noSlipFlagID, uint_c(4));
+ flagMapper->addMapping(FreeSurfaceBoundaryHandling_T::freeSlipFlagID, uint_c(6));
+ flagMapper->addMapping(FreeSurfaceBoundaryHandling_T::ubbFlagID, uint_c(6));
+ flagMapper->addMapping(FreeSurfaceBoundaryHandling_T::ubbInflowFlagID, uint_c(7));
+ flagMapper->addMapping(FreeSurfaceBoundaryHandling_T::pressureFlagID, uint_c(8));
+ flagMapper->addMapping(FreeSurfaceBoundaryHandling_T::pressureOutflowFlagID, uint_c(9));
+ flagMapper->addMapping(FreeSurfaceBoundaryHandling_T::outletFlagID, uint_c(10));
+ flagMapper->addMapping(FreeSurfaceBoundaryHandling_T::simpleExtrapolationOutflowFlagID, uint_c(11));
+
+ writers.push_back(flagMapper);
+
+ // filter for writing only liquid and interface cells to VTK
+ auto liquidInterfaceFilter = field::FlagFieldCellFilter< FlagField_T >(flagFieldID);
+ liquidInterfaceFilter.addFlag(flagIDs::liquidFlagID);
+ liquidInterfaceFilter.addFlag(flagIDs::interfaceFlagID);
+ filters["liquidInterfaceFilter"] = liquidInterfaceFilter;
+
+ // communicate fields to update the ghost layer
+ auto preVTKComm = blockforest::communication::UniformBufferedScheme< stencil::D3Q27 >(blockForest);
+ preVTKComm.addPackInfo(std::make_shared< field::communication::PackInfo< PdfField_T > >(pdfFieldID));
+ preVTKComm.addPackInfo(std::make_shared< field::communication::PackInfo< FlagField_T > >(flagFieldID));
+ preVTKComm.addPackInfo(std::make_shared< field::communication::PackInfo< ScalarField_T > >(fillFieldID));
+ preVTKComm.addPackInfo(std::make_shared< field::communication::PackInfo< ScalarField_T > >(curvatureFieldID));
+ preVTKComm.addPackInfo(std::make_shared< field::communication::PackInfo< VectorField_T > >(normalFieldID));
+ preVTKComm.addPackInfo(
+ std::make_shared< field::communication::PackInfo< VectorField_T > >(obstacleNormalFieldID));
+
+ beforeFuncs["ghost_layer_synchronization"] = preVTKComm;
+ };
+
+ // add VTK output to timeloop
+ std::map< std::string, vtk::SelectableOutputFunction > vtkOutputFunctions;
+ vtk::initializeVTKOutput(vtkOutputFunctions, vtkConfigFunc, blockForest, config);
+ for (auto output = vtkOutputFunctions.begin(); output != vtkOutputFunctions.end(); ++output)
+ {
+ timeloop.addFuncBeforeTimeStep(output->second.outputFunction, std::string("VTK: ") + output->first,
+ output->second.requiredGlobalStates, output->second.incompatibleGlobalStates);
+ }
+
+ // only enable the zerosetter (see below) if the non-liquid and non-interface cells are not excluded anyway
+ bool enableZeroSetter = true;
+ const auto vtkConfigBlock = config->getOneBlock("VTK");
+ const auto fluidFieldConfigBlock = vtkConfigBlock.getBlock("fluid_field");
+ if (fluidFieldConfigBlock)
+ {
+ auto inclusionFiltersConfigBlock = fluidFieldConfigBlock.getBlock("inclusion_filters");
+
+ if (inclusionFiltersConfigBlock.isDefined("liquidInterfaceFilter"))
+ {
+ // liquidInterfaceFilter is defined which limits VTK-output to only liquid and interface cells
+ enableZeroSetter = false;
+ }
+ }
+
+ // set velocity and density to zero in obstacle and gas cells (only for visualization purposes); the PDF values in
+ // these cells are not important and thus not set during the simulation
+ if (enableZeroSetter)
+ {
+ const auto function = [&](IBlock* block) {
+ using namespace free_surface;
+ PdfField_T* const pdfField = block->getData< PdfField_T >(pdfFieldID);
+ const FlagField_T* const flagField = block->getData< const FlagField_T >(flagFieldID);
+ WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ(pdfField, uint_c(1), {
+ const typename PdfField_T::Ptr pdfFieldPtr(*pdfField, x, y, z);
+ const typename FlagField_T::ConstPtr flagFieldPtr(*flagField, x, y, z);
+
+ if (flagInfo.isGas(*flagFieldPtr) || flagInfo.isObstacle(*flagFieldPtr))
+ {
+ pdfField->setDensityAndVelocity(pdfFieldPtr.cell(), Vector3< real_t >(0), real_c(1.0));
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ
+ };
+ timeloop.add() << Sweep(function, "VTK: zero-setting");
+ }
+}
+
+} // namespace free_surface
+} // namespace walberla
\ No newline at end of file
diff --git a/src/lbm/free_surface/boundary/CMakeLists.txt b/src/lbm/free_surface/boundary/CMakeLists.txt
new file mode 100644
index 0000000000000000000000000000000000000000..9b3f1195a0381d0d6cbf3137539a305863dde5d1
--- /dev/null
+++ b/src/lbm/free_surface/boundary/CMakeLists.txt
@@ -0,0 +1,6 @@
+target_sources( lbm
+ PRIVATE
+ FreeSurfaceBoundaryHandling.h
+ FreeSurfaceBoundaryHandling.impl.h
+ SimplePressureWithFreeSurface.h
+ )
diff --git a/src/lbm/free_surface/boundary/FreeSurfaceBoundaryHandling.h b/src/lbm/free_surface/boundary/FreeSurfaceBoundaryHandling.h
new file mode 100644
index 0000000000000000000000000000000000000000..f21e971cefcc5b0e152586be0bf70e0bc249abe1
--- /dev/null
+++ b/src/lbm/free_surface/boundary/FreeSurfaceBoundaryHandling.h
@@ -0,0 +1,188 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file Boundary.h
+//! \ingroup free_surface
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Boundary handling for the free surface LBM module.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "blockforest/StructuredBlockForest.h"
+#include "blockforest/communication/UniformBufferedScheme.h"
+
+#include "boundary/BoundaryHandling.h"
+
+#include "field/GhostLayerField.h"
+
+#include "geometry/initializer/InitializationManager.h"
+#include "geometry/initializer/OverlapFieldFromBody.h"
+
+#include "lbm/boundary/all.h"
+#include "lbm/field/PdfField.h"
+#include "lbm/free_surface/FlagInfo.h"
+#include "lbm/free_surface/InitFunctions.h"
+#include "lbm/free_surface/InterfaceFromFillLevel.h"
+#include "lbm/free_surface/boundary/SimplePressureWithFreeSurface.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Boundary handling for the free surface LBM extension.
+ **********************************************************************************************************************/
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+class FreeSurfaceBoundaryHandling
+{
+ public:
+ using flag_t = typename FlagField_T::value_type;
+ using Stencil_T = typename LatticeModel_T::Stencil;
+ using CommunicationStencil_T =
+ typename std::conditional< LatticeModel_T::Stencil::D == uint_t(2), stencil::D2Q9, stencil::D3Q27 >::type;
+ using PdfField_T = lbm::PdfField< LatticeModel_T >;
+
+ // boundary
+ using NoSlip_T = lbm::NoSlip< LatticeModel_T, flag_t >;
+ using FreeSlip_T = lbm::FreeSlip< LatticeModel_T, FlagField_T >;
+ using UBB_T = lbm::UBB< LatticeModel_T, flag_t >;
+ using Pressure_T = SimplePressureWithFreeSurface< LatticeModel_T, FlagField_T >;
+ using Outlet_T = lbm::Outlet< LatticeModel_T, FlagField_T, 4, 3 >;
+ using SimpleExtrapolationOutflow_T = lbm::SimpleExtrapolationOutflow< LatticeModel_T, FlagField_T >;
+ using UBB_Inflow_T =
+ lbm::UBB< LatticeModel_T, flag_t >; // creates interface cells in the direction of the prescribed velocity, i.e.,
+ // represents an inflow boundary condition
+
+ // handling type
+ using BoundaryHandling_T =
+ BoundaryHandling< FlagField_T, Stencil_T, NoSlip_T, UBB_T, UBB_Inflow_T, Pressure_T, Pressure_T, Outlet_T,
+ SimpleExtrapolationOutflow_T,
+ FreeSlip_T >; // 2 pressure boundaries with different densities, e.g., inflow-outflow
+
+ using FlagInfo_T = FlagInfo< FlagField_T >;
+
+ // constructor
+ FreeSurfaceBoundaryHandling(const std::shared_ptr< StructuredBlockForest >& blockForest, BlockDataID pdfFieldID,
+ BlockDataID fillLevelID);
+
+ // initialize fluid field from config file using (quotes indicate the string to be used in the file):
+ // - "CellInterval" (see src/geometry/initializer/BoundaryFromCellInterval.h)
+ // - "Border" (see src/geometry/initializer/BoundaryFromDomainBorder.h)
+ // - "Image" (see src/geometry/initializer/BoundaryFromImage.h)
+ // - "Body" (see src/geometry/initializer/OverlapFieldFromBody.h)
+ inline void initFromConfig(const Config::BlockHandle& block);
+
+ // initialize free surface object from geometric body (see src/geometry/initializer/OverlapFieldFromBody.h)
+ template< typename Body_T >
+ inline void addFreeSurfaceObject(const Body_T& body, bool addOrSubtract = false);
+
+ // clear and initialize flags in every cell according to the fill level and initialize fill level in boundaries (with
+ // value 1) and obstacles such that the bubble model does not detect obstacles as gas cells
+ void initFlagsFromFillLevel();
+
+ inline void setNoSlipAtBorder(stencil::Direction d, cell_idx_t wallDistance = cell_idx_c(0));
+ inline void setNoSlipAtAllBorders(cell_idx_t wallDistance = cell_idx_c(0));
+ void setNoSlipInCell(const Cell& globalCell);
+
+ inline void setFreeSlipAtBorder(stencil::Direction d, cell_idx_t wallDistance = cell_idx_c(0));
+ inline void setFreeSlipAtAllBorders(cell_idx_t wallDistance = cell_idx_c(0));
+ void setFreeSlipInCell(const Cell& globalCell);
+
+ void setUBBInCell(const Cell& globalCell, const Vector3< real_t >& velocity);
+
+ // UBB that generates interface cells to resemble an inflow boundary
+ void setInflowInCell(const Cell& globalCell, const Vector3< real_t >& velocity);
+
+ inline void setPressure(real_t density);
+ void setPressureOutflow(real_t density);
+ void setBodyForce(const Vector3< real_t >& bodyForce);
+
+ void enableBubbleOutflow(BubbleModelBase* bubbleModel);
+
+ // checks if an obstacle cell is located in an outermost ghost layer (corners are explicitly ignored, as they do not
+ // influence periodic communication)
+ Vector3< bool > isObstacleInGlobalGhostLayer();
+
+ // flag management
+ const FlagInfo< FlagField_T >& getFlagInfo() const { return flagInfo_; }
+
+ // flag IDs
+ static const field::FlagUID noSlipFlagID;
+ static const field::FlagUID ubbFlagID;
+ static const field::FlagUID ubbInflowFlagID;
+ static const field::FlagUID pressureFlagID;
+ static const field::FlagUID pressureOutflowFlagID;
+ static const field::FlagUID outletFlagID;
+ static const field::FlagUID simpleExtrapolationOutflowFlagID;
+ static const field::FlagUID freeSlipFlagID;
+
+ // boundary IDs
+ static const BoundaryUID noSlipBoundaryID;
+ static const BoundaryUID ubbBoundaryID;
+ static const BoundaryUID ubbInflowBoundaryID;
+ static const BoundaryUID pressureBoundaryID;
+ static const BoundaryUID pressureOutflowBoundaryID;
+ static const BoundaryUID outletBoundaryID;
+ static const BoundaryUID simpleExtrapolationOutflowBoundaryID;
+ static const BoundaryUID freeSlipBoundaryID;
+
+ inline BlockDataID getHandlingID() const { return handlingID_; }
+ inline BlockDataID getPdfFieldID() const { return pdfFieldID_; }
+ inline BlockDataID getFillFieldID() const { return fillFieldID_; }
+ inline BlockDataID getFlagFieldID() const { return flagFieldID_; }
+
+ // executes standard waLBerla boundary handling
+ class ExecuteBoundaryHandling
+ {
+ public:
+ ExecuteBoundaryHandling(const BlockDataID& collection) : handlingID_(collection) {}
+ void operator()(IBlock* const block) const
+ {
+ BoundaryHandling_T* const handling = block->getData< BoundaryHandling_T >(handlingID_);
+ // reset "near boundary" flags
+ handling->refresh();
+ (*handling)();
+ }
+
+ protected:
+ BlockDataID handlingID_;
+ }; // class ExecuteBoundaryHandling
+
+ ExecuteBoundaryHandling getBoundarySweep() const { return ExecuteBoundaryHandling(getHandlingID()); }
+
+ private:
+ FlagInfo< FlagField_T > flagInfo_;
+
+ // register standard waLBerla initializers
+ geometry::initializer::InitializationManager getInitManager();
+
+ std::shared_ptr< StructuredBlockForest > blockForest_;
+
+ BlockDataID flagFieldID_;
+ BlockDataID pdfFieldID_;
+ BlockDataID fillFieldID_;
+
+ BlockDataID handlingID_;
+
+ blockforest::communication::UniformBufferedScheme< CommunicationStencil_T > comm_;
+}; // class FreeSurfaceBoundaryHandling
+
+} // namespace free_surface
+} // namespace walberla
+
+#include "FreeSurfaceBoundaryHandling.impl.h"
diff --git a/src/lbm/free_surface/boundary/FreeSurfaceBoundaryHandling.impl.h b/src/lbm/free_surface/boundary/FreeSurfaceBoundaryHandling.impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..e5fde552fe8ff32e4b5a70f72aa4b03700149667
--- /dev/null
+++ b/src/lbm/free_surface/boundary/FreeSurfaceBoundaryHandling.impl.h
@@ -0,0 +1,554 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file FreeSurfaceBoundaryHandling.impl.h
+//! \ingroup free_surface
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Boundary handling for the free surface LBM module.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "field/AddToStorage.h"
+#include "field/FlagField.h"
+#include "field/communication/PackInfo.h"
+
+#include "geometry/initializer/BoundaryFromCellInterval.h"
+#include "geometry/initializer/BoundaryFromDomainBorder.h"
+#include "geometry/initializer/BoundaryFromImage.h"
+#include "geometry/structured/GrayScaleImage.h"
+
+#include "lbm/free_surface/FlagInfo.h"
+#include "lbm/free_surface/InterfaceFromFillLevel.h"
+#include "lbm/lattice_model/CollisionModel.h"
+
+#include "FreeSurfaceBoundaryHandling.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace internal
+{
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+class BoundaryBlockDataHandling
+ : public domain_decomposition::BlockDataHandling<
+ typename FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::BoundaryHandling_T >
+{
+ public:
+ using BoundaryHandling_T =
+ typename FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T,
+ ScalarField_T >::BoundaryHandling_T; // handling as defined in
+ // FreeSurfaceBoundaryHandling.h
+
+ BoundaryBlockDataHandling(const FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >* boundary)
+ : boundary_(boundary)
+ {}
+
+ // initialize standard waLBerla boundary handling
+ BoundaryHandling_T* initialize(IBlock* const block)
+ {
+ using B = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+ using flag_t = typename B::flag_t;
+
+ // get fields
+ FlagField_T* const flagField = block->getData< FlagField_T >(boundary_->getFlagFieldID());
+ typename B::PdfField_T* const pdfField = block->getData< typename B::PdfField_T >(boundary_->getPdfFieldID());
+
+ auto interfaceFlag = flag_t(flagField->getFlag(flagIDs::interfaceFlagID));
+ auto liquidFlag = flag_t(flagField->getFlag(flagIDs::liquidFlagID));
+
+ // domainMask is used to identify liquid and interface cells
+ auto domainMask = flag_t(liquidFlag | interfaceFlag);
+ WALBERLA_ASSERT(domainMask != 0);
+
+ // initialize boundary conditions
+ typename B::UBB_T ubb(B::ubbBoundaryID, B::ubbFlagID, pdfField, flagField);
+ typename B::UBB_Inflow_T ubbInflow(B::ubbInflowBoundaryID, B::ubbInflowFlagID, pdfField, flagField);
+ typename B::NoSlip_T noslip(B::noSlipBoundaryID, B::noSlipFlagID, pdfField);
+ typename B::Pressure_T pressure(B::pressureBoundaryID, B::pressureFlagID, block, pdfField, flagField,
+ interfaceFlag, real_c(1.0));
+ typename B::Pressure_T pressureOutflow(B::pressureOutflowBoundaryID, B::pressureOutflowFlagID, block, pdfField,
+ flagField, interfaceFlag, real_c(1.0));
+ typename B::Outlet_T outlet(B::outletBoundaryID, B::outletFlagID, pdfField, flagField, domainMask);
+ typename B::SimpleExtrapolationOutflow_T simpleExtrapolationOutflow(
+ B::simpleExtrapolationOutflowBoundaryID, B::simpleExtrapolationOutflowFlagID, pdfField);
+ typename B::FreeSlip_T freeSlip(B::freeSlipBoundaryID, B::freeSlipFlagID, pdfField, flagField, domainMask);
+
+ return new BoundaryHandling_T("Boundary Handling", flagField, domainMask, noslip, ubb, ubbInflow, pressure,
+ pressureOutflow, outlet, simpleExtrapolationOutflow, freeSlip);
+ }
+
+ void serialize(IBlock* const block, const BlockDataID& id, mpi::SendBuffer& buffer)
+ {
+ BoundaryHandling_T* const boundaryHandlingPtr = block->getData< BoundaryHandling_T >(id);
+ CellInterval everyCell = boundaryHandlingPtr->getFlagField()->xyzSizeWithGhostLayer();
+ boundaryHandlingPtr->pack(buffer, everyCell, true);
+ }
+
+ BoundaryHandling_T* deserialize(IBlock* const block) { return initialize(block); }
+
+ void deserialize(IBlock* const block, const BlockDataID& id, mpi::RecvBuffer& buffer)
+ {
+ BoundaryHandling_T* const boundaryHandlingPtr = block->getData< BoundaryHandling_T >(id);
+ CellInterval everyCell = boundaryHandlingPtr->getFlagField()->xyzSizeWithGhostLayer();
+ boundaryHandlingPtr->unpack(buffer, everyCell, true);
+ }
+
+ private:
+ const FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >* boundary_;
+}; // class BoundaryBlockDataHandling
+
+// helper function wrapper for adding the flag field to the block storage; since the input parameter for an
+// initialization function in field::addFlagFieldToStorage() is a std::function<void(FlagField_T*,IBlock* const)>, we
+// need a function wrapper that has both these input parameters; as FlagInfo< FlagField_T >::registerFlags() does not
+// have both of these input parameters, a function wrapper with both input parameters is created and the second input
+// parameter is simply ignored inside the function wrapper
+template< typename FlagField_T >
+void flagFieldInitFunction(FlagField_T* flagField, IBlock* const, const Set< field::FlagUID >& obstacleIDs,
+ const Set< field::FlagUID >& outflowIDs, const Set< field::FlagUID >& inflowIDs,
+ const Set< field::FlagUID >& freeSlipIDs)
+{
+ // register flags in the flag field
+ FlagInfo< FlagField_T >::registerFlags(flagField, obstacleIDs, outflowIDs, inflowIDs, freeSlipIDs);
+}
+
+} // namespace internal
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::FreeSurfaceBoundaryHandling(
+ const std::shared_ptr< StructuredBlockForest >& blockForest, BlockDataID pdfFieldID, BlockDataID fillLevelID)
+ : blockForest_(blockForest), pdfFieldID_(pdfFieldID), fillFieldID_(fillLevelID), comm_(blockForest)
+{
+ // initialize obstacleIDs
+ Set< FlagUID > obstacleIDs;
+ obstacleIDs += noSlipFlagID;
+ obstacleIDs += ubbFlagID;
+ obstacleIDs += ubbInflowFlagID;
+ obstacleIDs += pressureFlagID;
+ obstacleIDs += pressureOutflowFlagID;
+ obstacleIDs += freeSlipFlagID;
+ obstacleIDs += outletFlagID;
+ obstacleIDs += simpleExtrapolationOutflowFlagID;
+
+ // initialize outflowIDs
+ Set< FlagUID > outflowIDs;
+ outflowIDs += pressureOutflowFlagID;
+ outflowIDs += outletFlagID;
+ outflowIDs += simpleExtrapolationOutflowFlagID;
+
+ // initialize outflowIDs
+ Set< FlagUID > inflowIDs;
+ inflowIDs += ubbInflowFlagID;
+
+ // initialize freeSlipIDs
+ Set< FlagUID > freeSlipIDs;
+ freeSlipIDs += freeSlipFlagID;
+
+ // create callable function wrapper with input arguments 1 and 2 unset, whereas arguments 3, 4 and 5 are set to be
+ // obstacleIDs, outflowIDs, and inflowIDs, respectively; this is necessary for field::addFlagFieldToStorage()
+ auto ffInitFunc = std::bind(internal::flagFieldInitFunction< FlagField_T >, std::placeholders::_1,
+ std::placeholders::_2, obstacleIDs, outflowIDs, inflowIDs, freeSlipIDs);
+
+ // IMPORTANT REMARK: The flag field needs two ghost layers because of function advectMass(). There, the flags of all
+ // D3Q* neighbors are determined for each cell, including cells in the first ghost layer. Therefore, all D3Q*
+ // neighbors of the first ghost layer must be accessible. This requires a second ghost layer.
+ flagFieldID_ = field::addFlagFieldToStorage< FlagField_T >(blockForest, "Flags", uint_c(2), true, ffInitFunc);
+
+ // create FlagInfo
+ flagInfo_ = FlagInfo< FlagField_T >(obstacleIDs, outflowIDs, inflowIDs, freeSlipIDs);
+ WALBERLA_ASSERT(flagInfo_.isConsistentAcrossBlocksAndProcesses(blockForest, flagFieldID_));
+
+ // add boundary handling to blockForest
+ handlingID_ = blockForest_->addBlockData(
+ std::make_shared< internal::BoundaryBlockDataHandling< LatticeModel_T, FlagField_T, ScalarField_T > >(this),
+ "Boundary Handling");
+
+ // create communication object with fill level field, since fill levels determine the flags during the simulation
+ comm_.addPackInfo(std::make_shared< field::communication::PackInfo< ScalarField_T > >(fillFieldID_));
+}
+
+// define IDs (static const variables)
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+const field::FlagUID
+ FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::noSlipFlagID = field::FlagUID("NoSlip");
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+const field::FlagUID
+ FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::ubbFlagID = field::FlagUID("UBB");
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+const field::FlagUID FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::ubbInflowFlagID =
+ field::FlagUID("UBB_Inflow");
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+const field::FlagUID FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::pressureFlagID =
+ field::FlagUID("Pressure");
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+const field::FlagUID FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::pressureOutflowFlagID =
+ field::FlagUID("PressureOutflow");
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+const field::FlagUID
+ FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::outletFlagID = field::FlagUID("Outlet");
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+const field::FlagUID
+ FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::simpleExtrapolationOutflowFlagID =
+ field::FlagUID("SimpleExtrapolationOutflow");
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+const field::FlagUID FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::freeSlipFlagID =
+ field::FlagUID("FreeSlip");
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+const BoundaryUID
+ FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::noSlipBoundaryID = BoundaryUID("NoSlip");
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+const BoundaryUID
+ FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::ubbBoundaryID = BoundaryUID("UBB");
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+const BoundaryUID FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::ubbInflowBoundaryID =
+ BoundaryUID("UBB_Inflow");
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+const BoundaryUID FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::pressureBoundaryID =
+ BoundaryUID("Pressure");
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+const BoundaryUID FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::pressureOutflowBoundaryID =
+ BoundaryUID("PressureOutflow");
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+const BoundaryUID
+ FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::outletBoundaryID = BoundaryUID("Outlet");
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+const BoundaryUID
+ FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::simpleExtrapolationOutflowBoundaryID =
+ BoundaryUID("SimpleExtrapolationOutflow");
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+const BoundaryUID FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::freeSlipBoundaryID =
+ BoundaryUID("FreeSlip");
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+geometry::initializer::InitializationManager
+ FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::getInitManager()
+{
+ using namespace geometry::initializer;
+
+ InitializationManager initManager(blockForest_->getBlockStorage());
+
+ // define initializers
+ auto cellIntvInit = std::make_shared< BoundaryFromCellInterval< BoundaryHandling_T > >(*blockForest_, handlingID_);
+ auto borderInit = std::make_shared< BoundaryFromDomainBorder< BoundaryHandling_T > >(*blockForest_, handlingID_);
+ auto imgInit =
+ std::make_shared< BoundaryFromImage< BoundaryHandling_T, geometry::GrayScaleImage > >(*blockForest_, handlingID_);
+ auto bodyInit = std::make_shared< OverlapFieldFromBody >(*blockForest_, fillFieldID_);
+
+ // register initializers
+ initManager.registerInitializer("CellInterval", cellIntvInit);
+ initManager.registerInitializer("Border", borderInit);
+ initManager.registerInitializer("Image", imgInit);
+ initManager.registerInitializer("Body", bodyInit);
+
+ return initManager;
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+void FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::initFromConfig(
+ const Config::BlockHandle& configBlock)
+{
+ // initialize from config file
+ getInitManager().init(configBlock);
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+template< typename Body_T >
+void FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::addFreeSurfaceObject(const Body_T& body,
+ bool addOrSubtract)
+{
+ geometry::initializer::OverlapFieldFromBody(*blockForest_, fillFieldID_).init(body, addOrSubtract);
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+void FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::setNoSlipAtBorder(
+ stencil::Direction d, cell_idx_t wallDistance)
+{
+ geometry::initializer::BoundaryFromDomainBorder< BoundaryHandling_T > init(*blockForest_, handlingID_);
+ init.init(noSlipFlagID, d, wallDistance);
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+void FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::setNoSlipAtAllBorders(
+ cell_idx_t wallDistance)
+{
+ geometry::initializer::BoundaryFromDomainBorder< BoundaryHandling_T > init(*blockForest_, handlingID_);
+ init.initAllBorders(noSlipFlagID, wallDistance);
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+void FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::setNoSlipInCell(const Cell& globalCell)
+{
+ for (auto blockIt = blockForest_->begin(); blockIt != blockForest_->end(); ++blockIt)
+ {
+ BoundaryHandling_T* const handling = blockIt->template getData< BoundaryHandling_T >(handlingID_);
+
+ // transform cell in global coordinates to cell in block local coordinates
+ Cell blockLocalCell;
+ blockForest_->transformGlobalToBlockLocalCell(blockLocalCell, *blockIt, globalCell);
+
+ handling->forceBoundary(noSlipFlagID, blockLocalCell[0], blockLocalCell[1], blockLocalCell[2]);
+ }
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+void FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::setFreeSlipAtBorder(
+ stencil::Direction d, cell_idx_t wallDistance)
+{
+ geometry::initializer::BoundaryFromDomainBorder< BoundaryHandling_T > init(*blockForest_, handlingID_);
+ init.init(freeSlipFlagID, d, wallDistance);
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+void FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::setFreeSlipAtAllBorders(
+ cell_idx_t wallDistance)
+{
+ geometry::initializer::BoundaryFromDomainBorder< BoundaryHandling_T > init(*blockForest_, handlingID_);
+ init.initAllBorders(freeSlipFlagID, wallDistance);
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+void FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::setFreeSlipInCell(
+ const Cell& globalCell)
+{
+ for (auto blockIt = blockForest_->begin(); blockIt != blockForest_->end(); ++blockIt)
+ {
+ BoundaryHandling_T* const handling = blockIt->template getData< BoundaryHandling_T >(handlingID_);
+
+ // transform cell in global coordinates to cell in block local coordinates
+ Cell blockLocalCell;
+ blockForest_->transformGlobalToBlockLocalCell(blockLocalCell, *blockIt, globalCell);
+
+ handling->forceBoundary(freeSlipFlagID, blockLocalCell[0], blockLocalCell[1], blockLocalCell[2]);
+ }
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+void FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::setPressure(real_t density)
+{
+ for (auto blockIt = blockForest_->begin(); blockIt != blockForest_->end(); ++blockIt)
+ {
+ BoundaryHandling_T* const handling = blockIt->template getData< BoundaryHandling_T >(handlingID_);
+ Pressure_T& pressure =
+ handling->template getBoundaryCondition< Pressure_T >(handling->getBoundaryUID(pressureFlagID));
+ pressure.setLatticeDensity(density);
+ }
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+void FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::setUBBInCell(
+ const Cell& globalCell, const Vector3< real_t >& velocity)
+{
+ for (auto blockIt = blockForest_->begin(); blockIt != blockForest_->end(); ++blockIt)
+ {
+ BoundaryHandling_T* const handling = blockIt->template getData< BoundaryHandling_T >(handlingID_);
+
+ typename UBB_Inflow_T::Velocity ubbVel(velocity);
+
+ // transform cell in global coordinates to cell in block-local coordinates
+ Cell blockLocalCell;
+ blockForest_->transformGlobalToBlockLocalCell(blockLocalCell, *blockIt, globalCell);
+
+ // get block cell bounding box to check if cell is contained in block
+ CellInterval blockCellBB = blockForest_->getBlockCellBB(*blockIt);
+
+ // flag field has two ghost layers so blockCellBB is actually larger than returned; this is relevant for setups
+ // where the UBB is set in a ghost layer cell
+ blockCellBB.expand(cell_idx_c(2));
+
+ if (blockCellBB.contains(globalCell))
+ {
+ handling->forceBoundary(ubbFlagID, blockLocalCell[0], blockLocalCell[1], blockLocalCell[2], ubbVel);
+ }
+ }
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+void FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::setInflowInCell(
+ const Cell& globalCell, const Vector3< real_t >& velocity)
+{
+ for (auto blockIt = blockForest_->begin(); blockIt != blockForest_->end(); ++blockIt)
+ {
+ BoundaryHandling_T* const handling = blockIt->template getData< BoundaryHandling_T >(handlingID_);
+
+ typename UBB_Inflow_T::Velocity ubbVel(velocity);
+
+ // transform cell in global coordinates to cell in block-local coordinates
+ Cell blockLocalCell;
+ blockForest_->transformGlobalToBlockLocalCell(blockLocalCell, *blockIt, globalCell);
+
+ // get block cell bounding box to check if cell is contained in block
+ CellInterval blockCellBB = blockForest_->getBlockCellBB(*blockIt);
+
+ // flag field has two ghost layers so blockCellBB is actually larger than returned; this is relevant for setups
+ // where the UBB is set in a ghost layer cell
+ blockCellBB.expand(cell_idx_c(2));
+
+ if (blockCellBB.contains(globalCell))
+ {
+ handling->forceBoundary(ubbInflowFlagID, blockLocalCell[0], blockLocalCell[1], blockLocalCell[2], ubbVel);
+ }
+ }
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+void FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::setPressureOutflow(real_t density)
+{
+ for (auto blockIt = blockForest_->begin(); blockIt != blockForest_->end(); ++blockIt)
+ {
+ BoundaryHandling_T* const handling = blockIt->template getData< BoundaryHandling_T >(handlingID_);
+ Pressure_T& pressure =
+ handling->template getBoundaryCondition< Pressure_T >(handling->getBoundaryUID(pressureOutflowFlagID));
+ pressure.setLatticeDensity(density);
+ }
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+void FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::enableBubbleOutflow(
+ BubbleModelBase* bubbleModel)
+{
+ for (auto blockIt = blockForest_->begin(); blockIt != blockForest_->end(); ++blockIt)
+ {
+ BoundaryHandling_T* const handling = blockIt->template getData< BoundaryHandling_T >(handlingID_);
+
+ // get pressure from boundary handling
+ Pressure_T& pressure =
+ handling->template getBoundaryCondition< Pressure_T >(handling->getBoundaryUID(pressureFlagID));
+ Pressure_T& pressureOutflow =
+ handling->template getBoundaryCondition< Pressure_T >(handling->getBoundaryUID(pressureOutflowFlagID));
+
+ // set pressure in bubble model
+ pressure.setBubbleModel(bubbleModel);
+ pressureOutflow.setBubbleModel(bubbleModel);
+ }
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+Vector3< bool >
+ FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::isObstacleInGlobalGhostLayer()
+{
+ Vector3< bool > isObstacleInGlobalGhostLayer(false, false, false);
+
+ for (auto blockIt = blockForest_->begin(); blockIt != blockForest_->end(); ++blockIt)
+ {
+ const FlagField_T* const flagField = blockIt->template getData< const FlagField_T >(flagFieldID_);
+
+ const CellInterval domainCellBB = blockForest_->getDomainCellBB();
+
+ // disable OpenMP such that loop termination works correctly
+ WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ_OMP(flagField, uint_c(1), omp critical, {
+ // get cell in global coordinates
+ Cell globalCell = Cell(x, y, z);
+ blockForest_->transformBlockLocalToGlobalCell(globalCell, *blockIt);
+
+ // check if the current cell is located in a global ghost layer
+ const bool isCellInGlobalGhostLayerX =
+ globalCell[0] < domainCellBB.xMin() || globalCell[0] > domainCellBB.xMax();
+
+ const bool isCellInGlobalGhostLayerY =
+ globalCell[1] < domainCellBB.yMin() || globalCell[1] > domainCellBB.yMax();
+
+ const bool isCellInGlobalGhostLayerZ =
+ globalCell[2] < domainCellBB.zMin() || globalCell[2] > domainCellBB.zMax();
+
+ // skip corners, as they do not influence periodic communication
+ if ((isCellInGlobalGhostLayerX && (isCellInGlobalGhostLayerY || isCellInGlobalGhostLayerZ)) ||
+ (isCellInGlobalGhostLayerY && isCellInGlobalGhostLayerZ))
+ {
+ continue;
+ }
+
+ if (!isObstacleInGlobalGhostLayer[0] && isCellInGlobalGhostLayerX &&
+ isPartOfMaskSet(flagField->get(x, y, z), flagField->getMask(flagInfo_.getObstacleIDSet())))
+ {
+ isObstacleInGlobalGhostLayer[0] = true;
+ }
+
+ if (!isObstacleInGlobalGhostLayer[1] && isCellInGlobalGhostLayerY &&
+ isPartOfMaskSet(flagField->get(x, y, z), flagField->getMask(flagInfo_.getObstacleIDSet())))
+ {
+ isObstacleInGlobalGhostLayer[1] = true;
+ }
+
+ if (!isObstacleInGlobalGhostLayer[2] && isCellInGlobalGhostLayerZ &&
+ isPartOfMaskSet(flagField->get(x, y, z), flagField->getMask(flagInfo_.getObstacleIDSet())))
+ {
+ isObstacleInGlobalGhostLayer[2] = true;
+ }
+
+ if (isObstacleInGlobalGhostLayer[0] && isObstacleInGlobalGhostLayer[1] && isObstacleInGlobalGhostLayer[2])
+ {
+ break; // there is no need to check other cells on this block
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ_OMP
+ }
+
+ mpi::allReduceInplace(isObstacleInGlobalGhostLayer[0], mpi::LOGICAL_OR);
+ mpi::allReduceInplace(isObstacleInGlobalGhostLayer[1], mpi::LOGICAL_OR);
+ mpi::allReduceInplace(isObstacleInGlobalGhostLayer[2], mpi::LOGICAL_OR);
+
+ return isObstacleInGlobalGhostLayer;
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T >
+void FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::initFlagsFromFillLevel()
+{
+ const Vector3< bool > isObstacleInGlobalGhostLayer = this->isObstacleInGlobalGhostLayer();
+
+ WALBERLA_ROOT_SECTION()
+ {
+ if ((blockForest_->isXPeriodic() && isObstacleInGlobalGhostLayer[0]) ||
+ (blockForest_->isYPeriodic() && isObstacleInGlobalGhostLayer[1]) ||
+ (blockForest_->isZPeriodic() && isObstacleInGlobalGhostLayer[2]))
+ {
+ WALBERLA_LOG_WARNING_ON_ROOT(
+ "WARNING: An obstacle cell is located in a global outermost ghost layer in a periodic "
+ "direction. Be aware that due to periodicity, this obstacle cell will be "
+ "overwritten during communication.");
+ }
+ }
+
+ // communicate fill level (neighborhood is used in initialization)
+ comm_();
+
+ // initialize fill level in boundaries (with value 1), i.e., obstacles such that the bubble model does not detect
+ // obstacles as gas cells
+ free_surface::initFillLevelsInBoundaries< BoundaryHandling_T, typename LatticeModel_T::Stencil, ScalarField_T >(
+ blockForest_, handlingID_, fillFieldID_);
+
+ // clear and initialize flags in every cell according to the fill level
+ free_surface::initFlagsFromFillLevels< BoundaryHandling_T, typename LatticeModel_T::Stencil, FlagField_T,
+ const ScalarField_T >(blockForest_, flagInfo_, handlingID_, fillFieldID_);
+}
+
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/boundary/SimplePressureWithFreeSurface.h b/src/lbm/free_surface/boundary/SimplePressureWithFreeSurface.h
new file mode 100644
index 0000000000000000000000000000000000000000..534d965f9ea15cb34554e70297b0133c45beed69
--- /dev/null
+++ b/src/lbm/free_surface/boundary/SimplePressureWithFreeSurface.h
@@ -0,0 +1,150 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file SimplePressureWithFreeSurface.h
+//! \ingroup free_surface
+//! \author Martin Bauer
+//! \author Christian Godenschwager
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief SimplePressure boundary condition for the free surface LBM.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "boundary/Boundary.h"
+
+#include "core/DataTypes.h"
+#include "core/cell/CellInterval.h"
+#include "core/config/Config.h"
+#include "core/debug/Debug.h"
+#include "core/math/Vector3.h"
+
+#include "field/FlagField.h"
+
+#include "lbm/field/PdfField.h"
+#include "lbm/free_surface/bubble_model/BubbleModel.h"
+#include "lbm/lattice_model/EquilibriumDistribution.h"
+#include "lbm/lattice_model/ForceModel.h"
+
+#include "stencil/Directions.h"
+
+#include <vector>
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * SimplePressure boundary condition for the free surface LBM. The implementation is almost identical to the general
+ * lbm/boundary/SimplePressure.h boundary condition, however, the boundary pressure (density) is also set in the bubble
+ * model.
+ **********************************************************************************************************************/
+template< typename LatticeModel_T, typename FlagField_T >
+class SimplePressureWithFreeSurface : public boundary::Boundary< typename FlagField_T::flag_t >
+{
+ using PdfField_T = lbm::PdfField< LatticeModel_T >;
+ using Stencil_T = typename LatticeModel_T::Stencil;
+ using flag_t = typename FlagField_T::flag_t;
+
+ public:
+ static const bool threadsafe = true;
+
+ static std::shared_ptr< BoundaryConfiguration > createConfiguration(const Config::BlockHandle& /*config*/)
+ {
+ return std::make_shared< BoundaryConfiguration >();
+ }
+
+ SimplePressureWithFreeSurface(const BoundaryUID& boundaryUID, const FlagUID& uid, IBlock* block,
+ PdfField_T* const pdfField, FlagField_T* flagField, flag_t interfaceFlag,
+ const real_t latticeDensity)
+ : Boundary< flag_t >(boundaryUID), uid_(uid), block_(block), pdfs_(pdfField), flagField_(flagField),
+ interfaceFlag_(interfaceFlag), bubbleModel_(nullptr), latticeDensity_(latticeDensity)
+ {
+ WALBERLA_ASSERT_NOT_NULLPTR(pdfs_);
+ WALBERLA_ASSERT_NOT_NULLPTR(flagField);
+ }
+
+ void pushFlags(std::vector< FlagUID >& uids) const { uids.push_back(uid_); }
+
+ void beforeBoundaryTreatment() const {}
+ void afterBoundaryTreatment() const {}
+
+ template< typename Buffer_T >
+ void packCell(Buffer_T&, const cell_idx_t, const cell_idx_t, const cell_idx_t) const
+ {}
+
+ template< typename Buffer_T >
+ void registerCell(Buffer_T&, const flag_t, const cell_idx_t, const cell_idx_t, const cell_idx_t)
+ {}
+
+ void registerCell(const flag_t, const cell_idx_t, const cell_idx_t, const cell_idx_t, const BoundaryConfiguration&)
+ {}
+ void registerCells(const flag_t, const CellInterval&, const BoundaryConfiguration&) const {}
+ template< typename CellIterator >
+ void registerCells(const flag_t, const CellIterator&, const CellIterator&, const BoundaryConfiguration&) const
+ {}
+
+ void unregisterCell(const flag_t, const cell_idx_t, const cell_idx_t, const cell_idx_t) const {}
+
+ void setLatticeDensity(real_t newLatticeDensity) { latticeDensity_ = newLatticeDensity; }
+
+ void setBubbleModel(BubbleModelBase* bubbleModel) { bubbleModel_ = bubbleModel; }
+
+#ifndef NDEBUG
+ inline void treatDirection(const cell_idx_t x, const cell_idx_t y, const cell_idx_t z, const stencil::Direction dir,
+ const cell_idx_t nx, const cell_idx_t ny, const cell_idx_t nz, const flag_t mask)
+#else
+ inline void treatDirection(const cell_idx_t x, const cell_idx_t y, const cell_idx_t z, const stencil::Direction dir,
+ const cell_idx_t nx, const cell_idx_t ny, const cell_idx_t nz, const flag_t /*mask*/)
+#endif
+ {
+ WALBERLA_ASSERT_EQUAL(nx, x + cell_idx_c(stencil::cx[dir]));
+ WALBERLA_ASSERT_EQUAL(ny, y + cell_idx_c(stencil::cy[dir]));
+ WALBERLA_ASSERT_EQUAL(nz, z + cell_idx_c(stencil::cz[dir]));
+
+ WALBERLA_ASSERT_UNEQUAL((mask & this->mask_), numeric_cast< flag_t >(0));
+ WALBERLA_ASSERT_EQUAL((mask & this->mask_),
+ this->mask_); // only true if "this->mask_" only contains one single flag, which is the case
+ // for the current implementation of this boundary condition (SimplePressure)
+ Vector3< real_t > u = pdfs_->getVelocity(x, y, z);
+
+ // set density in bubble model according to pressure boundary condition
+ if (bubbleModel_ && flagField_->isFlagSet(x, y, z, interfaceFlag_))
+ {
+ bubbleModel_->setDensity(block_, Cell(x, y, z), latticeDensity_);
+ }
+
+ // result will be streamed to (x,y,z, stencil::inverseDir[d]) during sweep
+ pdfs_->get(nx, ny, nz, Stencil_T::invDirIdx(dir)) =
+ -pdfs_->get(x, y, z, Stencil_T::idx[dir]) // anti-bounce-back
+ + real_c(2) * lbm::EquilibriumDistribution< LatticeModel_T >::getSymmetricPart(
+ dir, u, latticeDensity_); // pressure term
+ }
+
+ protected:
+ FlagUID uid_;
+
+ IBlock* block_;
+ PdfField_T* pdfs_;
+ FlagField_T* flagField_;
+ flag_t interfaceFlag_;
+ BubbleModelBase* bubbleModel_;
+
+ real_t latticeDensity_;
+};
+
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/bubble_model/Bubble.h b/src/lbm/free_surface/bubble_model/Bubble.h
new file mode 100644
index 0000000000000000000000000000000000000000..bb3b9a074f28256fd3693cee690be43f7134dfb4
--- /dev/null
+++ b/src/lbm/free_surface/bubble_model/Bubble.h
@@ -0,0 +1,171 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file Bubble.h
+//! \ingroup bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Describes a bubble as gas volume via volume and density.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/DataTypes.h"
+#include "core/debug/Debug.h"
+#include "core/mpi/MPIWrapper.h"
+#include "core/mpi/RecvBuffer.h"
+#include "core/mpi/SendBuffer.h"
+
+#include <iostream>
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+// forward declarations of friend classes
+template< typename Stencil_T >
+class BubbleModel;
+
+class MergeInformation;
+
+/***********************************************************************************************************************
+ * Describes a bubble as gas volume via volume and density. A bubble can be located on multiple blocks, i.e., processes.
+ **********************************************************************************************************************/
+class Bubble
+{
+ public:
+ explicit Bubble(real_t initVolume)
+ : initVolume_(initVolume), currentVolume_(initVolume), volumeDiff_(real_c(0)), rho_(real_c(1.0))
+ {}
+
+ Bubble(real_t initVolume, real_t density)
+ : initVolume_(initVolume), currentVolume_(density * initVolume), volumeDiff_(real_c(0)), rho_(density)
+ {}
+
+ // dummy constructor with meaningless default values
+ Bubble() : initVolume_(real_c(-1.0)), currentVolume_(real_c(-1.0)), volumeDiff_(real_c(0)), rho_(real_c(-1.0)) {}
+
+ real_t getInitVolume() const { return initVolume_; }
+ real_t getCurrentVolume() const { return currentVolume_; }
+ real_t getDensity() const { return rho_; }
+
+ bool hasConstantDensity() const { return hasConstantDensity_; }
+
+ void setConstantDensity(real_t density = real_c(1.0))
+ {
+ hasConstantDensity_ = true;
+ rho_ = density;
+ }
+
+ // update the bubble volume change
+ void updateVolumeDiff(real_t diff) { volumeDiff_ += diff; }
+
+ void setDensity(real_t rho)
+ {
+ initVolume_ = rho * currentVolume_;
+ updateDensity();
+ }
+
+ private:
+ template< typename Stencil_T >
+ friend class BubbleModel;
+
+ friend class MergeInformation;
+
+ // merge bubbles by adding volumes, and update density (see dissertation of S. Bogner, 2017, section 4.3)
+ void merge(const Bubble& other)
+ {
+ initVolume_ += other.initVolume_;
+ currentVolume_ += other.currentVolume_;
+ updateDensity();
+ }
+
+ // update bubble volume and density using the change in the bubble's volume (see dissertation of S. Bogner, 2017,
+ // section 4.3)
+ void applyVolumeDiff(real_t diff)
+ {
+ WALBERLA_ASSERT(volumeDiff_ <= real_c(0.0));
+ currentVolume_ += diff;
+ updateDensity();
+ }
+
+ // return and reset the bubble's volume change
+ real_t getAndResetVolumeDiff()
+ {
+ real_t ret = volumeDiff_;
+ volumeDiff_ = real_c(0);
+ return ret;
+ }
+
+ // update bubble density (see dissertation of S. Bogner, 2017, section 4.3)
+ void updateDensity()
+ {
+ if (hasConstantDensity_) return;
+ rho_ = initVolume_ / currentVolume_;
+ }
+
+ real_t initVolume_;
+ real_t currentVolume_;
+ real_t volumeDiff_; // bubble's volume change (caused by interface fill level or movement)
+ real_t rho_;
+
+ bool hasConstantDensity_{ false };
+
+ // function for packing a bubble into SendBuffer
+ friend mpi::SendBuffer& operator<<(mpi::SendBuffer& buf, const Bubble& b);
+
+ // function for unpacking a bubble from RecvBuffer
+ friend mpi::RecvBuffer& operator>>(mpi::RecvBuffer& buf, Bubble& b);
+}; // class Bubble
+
+inline mpi::SendBuffer& operator<<(mpi::SendBuffer& buf, const Bubble& b)
+{
+ return buf << b.initVolume_ << b.currentVolume_;
+}
+
+inline mpi::RecvBuffer& operator>>(mpi::RecvBuffer& buf, Bubble& b)
+{
+ buf >> b.initVolume_ >> b.currentVolume_;
+ b.updateDensity();
+ return buf;
+}
+
+inline std::ostream& operator<<(std::ostream& os, const Bubble& b)
+{
+ os << "Bubble (" << b.getInitVolume() << "," << b.getCurrentVolume() << "," << b.getDensity() << ")";
+
+ return os;
+}
+
+} // namespace bubble_model
+} // namespace free_surface
+} // namespace walberla
+
+namespace walberla
+{
+namespace mpi
+{
+template<> // value type
+struct BufferSizeTrait< free_surface::bubble_model::Bubble >
+{
+ static const bool constantSize = true;
+ // 2 * real_t since the buffers above are filled with initVolume_ and currentVolume_
+ static const uint_t size = 2 * sizeof(real_t) + mpi::BUFFER_DEBUG_OVERHEAD;
+};
+} // namespace mpi
+} // namespace walberla
diff --git a/src/lbm/free_surface/bubble_model/BubbleDefinitions.h b/src/lbm/free_surface/bubble_model/BubbleDefinitions.h
new file mode 100644
index 0000000000000000000000000000000000000000..b67397be121de63912a58f2c8787ae4895dc8e46
--- /dev/null
+++ b/src/lbm/free_surface/bubble_model/BubbleDefinitions.h
@@ -0,0 +1,42 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file BubbleDefinitions.h
+//! \ingroup bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Type definitions for the bubble_model.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "field/GhostLayerField.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+using BubbleID = uint32_t;
+const uint32_t INVALID_BUBBLE_ID = uint32_t(-1);
+
+using BubbleField_T = GhostLayerField< BubbleID, 1 >;
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+
+} // namespace bubble_model
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/bubble_model/BubbleDistanceAdaptor.h b/src/lbm/free_surface/bubble_model/BubbleDistanceAdaptor.h
new file mode 100644
index 0000000000000000000000000000000000000000..8f6a24a687f3950c76eda732c405ba6c0c80c118
--- /dev/null
+++ b/src/lbm/free_surface/bubble_model/BubbleDistanceAdaptor.h
@@ -0,0 +1,76 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file BubbleDistanceAdaptor.h
+//! \ingroup bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Get the distance to a certain bubble ID.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "field/adaptors/GhostLayerFieldAdaptor.h"
+
+#include "DisjoiningPressureBubbleModel.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+/***********************************************************************************************************************
+ * Get the distance to a certain bubble ID. The search region is limited by maxDistance.
+ **********************************************************************************************************************/
+class BubbleDistanceAdaptionFunction
+{
+ public:
+ using basefield_t = DisjoiningPressureBubbleModel::DistanceField;
+ using basefield_iterator = basefield_t::const_base_iterator;
+ using value_type = real_t;
+
+ static const uint_t F_SIZE = 1u;
+
+ BubbleDistanceAdaptionFunction(BubbleID ownBubbleID, real_t maxDistance)
+ : bubbleID_(ownBubbleID), maxDistance_(maxDistance)
+ {
+ WALBERLA_ASSERT_GREATER(maxDistance_, real_c(1.0));
+ }
+
+ value_type operator()(const basefield_t& baseField, cell_idx_t x, cell_idx_t y, cell_idx_t z,
+ cell_idx_t /*f*/ = 0) const
+ {
+ WALBERLA_ASSERT_GREATER(maxDistance_, real_c(1.0));
+ return baseField.get(x, y, z).getDistanceToNearestBubble(bubbleID_, maxDistance_);
+ }
+
+ value_type operator()(const basefield_iterator& it) const
+ {
+ WALBERLA_ASSERT_GREATER(maxDistance_, real_c(1.0));
+ return it->getDistanceToNearestBubble(bubbleID_, maxDistance_);
+ }
+
+ private:
+ BubbleID bubbleID_;
+ real_t maxDistance_;
+}; // class BubbleDistanceAdaptionFunction
+
+using BubbleDistanceAdaptor = field::GhostLayerFieldAdaptor< BubbleDistanceAdaptionFunction, 0 >;
+
+} // namespace bubble_model
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/bubble_model/BubbleIDFieldPackInfo.h b/src/lbm/free_surface/bubble_model/BubbleIDFieldPackInfo.h
new file mode 100644
index 0000000000000000000000000000000000000000..05b0f0b23dc1c235c1cc72c3902722ac55441e88
--- /dev/null
+++ b/src/lbm/free_surface/bubble_model/BubbleIDFieldPackInfo.h
@@ -0,0 +1,147 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file BubbleIDFieldPackInfo.h
+//! \ingroup bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Pack/unpack information for a field containing bubble IDs.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "field/communication/PackInfo.h"
+
+#include "stencil/D3Q27.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+/***********************************************************************************************************************
+ * Pack/unpack information for a field containing bubble IDs.
+ *
+ * The bubble ID field requires a special pack info, since whenever the ghost layers are updated, the bubble model has
+ * to look for possible bubble merges.
+ *
+ * This could also be implemented with a regular FieldPackInfo and an immediate loop over the ghost layer only. However,
+ * it is more efficient by directly looking for bubble merges while unpacking the ghost layer, since the elements
+ * do not have to be loaded twice.
+ ***********************************************************************************************************************/
+template< typename Stencil_T >
+class BubbleIDFieldPackInfo : public field::communication::PackInfo< GhostLayerField< BubbleID, 1 > >
+{
+ public:
+ using CommunicationStencil_T =
+ typename std::conditional< Stencil_T::D == uint_t(2), stencil::D2Q9, stencil::D3Q27 >::type;
+
+ using field_t = GhostLayerField< BubbleID, 1 >;
+
+ BubbleIDFieldPackInfo(const BlockDataID& bdId, MergeInformation* mergeInfo)
+ : field::communication::PackInfo< field_t >(bdId), mergeInfo_(mergeInfo)
+ {}
+
+ bool threadsafeReceiving() const override { return false; }
+
+ void unpackData(IBlock* receiver, stencil::Direction dir, mpi::RecvBuffer& buffer) override
+ {
+ field_t* const field = receiver->getData< field_t >(this->bdId_);
+ WALBERLA_ASSERT_NOT_NULLPTR(field);
+
+#ifndef NDEBUG
+ uint_t xSize;
+ uint_t ySize;
+ uint_t zSize;
+ buffer >> xSize >> ySize >> zSize;
+ WALBERLA_ASSERT_EQUAL(xSize, field->xSize());
+ WALBERLA_ASSERT_EQUAL(ySize, field->ySize());
+ WALBERLA_ASSERT_EQUAL(zSize, field->zSize());
+#endif
+
+ for (auto fieldIt = field->beginGhostLayerOnly(dir); fieldIt != field->end(); ++fieldIt)
+ {
+ // update ghost layer with received values
+ buffer >> *fieldIt;
+
+ // look for bubble merges with bubbles from other blocks, i.e., analyze the just received ghost layer
+ lookForMerges(fieldIt, dir, field);
+ }
+ }
+
+ // communicate bubble IDs locally (between blocks on the same process) and immediately check for bubble merges
+ void communicateLocal(const IBlock* sender, IBlock* receiver, stencil::Direction dir) override
+ {
+ // get sender and receiver fields
+ const field_t* const senderField = sender->getData< const field_t >(this->bdId_);
+ field_t* const receiverField = receiver->getData< field_t >(this->bdId_);
+
+ WALBERLA_ASSERT_EQUAL(senderField->xSize(), receiverField->xSize());
+ WALBERLA_ASSERT_EQUAL(senderField->ySize(), receiverField->ySize());
+ WALBERLA_ASSERT_EQUAL(senderField->zSize(), receiverField->zSize());
+
+ auto srcIt = senderField->beginSliceBeforeGhostLayer(dir); // iterates only over last slice before ghost layer
+ auto dstIt = receiverField->beginGhostLayerOnly(stencil::inverseDir[dir]); // iterates only over ghost layer
+
+ while (srcIt != senderField->end())
+ {
+ // fill receiver's ghost layer with values from the sender's outermost inner layer
+ *dstIt = *srcIt;
+
+ // look for bubble merges with bubbles from other blocks, i.e., analyze the just received ghost layer
+ lookForMerges(dstIt, stencil::inverseDir[dir], receiverField);
+
+ ++srcIt;
+ ++dstIt;
+ }
+
+ WALBERLA_ASSERT(srcIt == senderField->end() && dstIt == receiverField->end());
+ }
+
+ protected:
+ // looks for bubble merges with bubbles from other blocks from the view of a ghost layer; argument "iterator i"
+ // should iterate ghost layer only
+ void lookForMerges(const field_t::iterator& i, stencil::Direction dir, const field_t* field)
+ {
+ using namespace stencil;
+
+ // only iterate the relevant neighborhood, for example:
+ // in ghost layer at "W", check all neighbors in directions containing "E"
+ // in ghost layer at "NE", check all neighbors in directions containing "SW" (=> SW, TSW and BSW)
+ // in ghost layer at "TNE", only check the neighbor in direction "BSW"
+ for (uint_t d = uint_c(0); d < uint_c(CommunicationStencil_T::d_per_d_length[inverseDir[dir]]); ++d)
+ {
+ const Direction neighborDirection = CommunicationStencil_T::d_per_d[inverseDir[dir]][d];
+ auto neighborVal = i.neighbor(neighborDirection);
+
+ // merge only occurs if bubble IDs from both blocks are valid and different
+ if (neighborVal != INVALID_BUBBLE_ID && *i != INVALID_BUBBLE_ID && neighborVal != *i)
+ {
+ Cell neighborCell = i.cell() + Cell(cx[neighborDirection], cy[neighborDirection], cz[neighborDirection]);
+
+ // make sure that the neighboring cell is not in a different ghost layer but part of the domain
+ if (field->isInInnerPart(neighborCell)) { mergeInfo_->registerMerge(*i, neighborVal); }
+ }
+ }
+ }
+
+ MergeInformation* mergeInfo_;
+}; // class BubbleIDFieldPackInfo
+
+} // namespace bubble_model
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/bubble_model/BubbleModel.h b/src/lbm/free_surface/bubble_model/BubbleModel.h
new file mode 100644
index 0000000000000000000000000000000000000000..a22d540eaac0904f62d7652c0f2c5e91c66a900c
--- /dev/null
+++ b/src/lbm/free_surface/bubble_model/BubbleModel.h
@@ -0,0 +1,240 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file BubbleModel.h
+//! \ingroup bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief System for tracking pressure/density in gas volumes.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "blockforest/StructuredBlockForest.h"
+#include "blockforest/communication/UniformBufferedScheme.h"
+
+#include "core/math/Vector3.h"
+
+#include "field/GhostLayerField.h"
+
+#include "stencil/D2Q9.h"
+#include "stencil/D3Q27.h"
+
+#include "Bubble.h"
+#include "BubbleDefinitions.h"
+#include "FloodFill.h"
+#include "MergeInformation.h"
+#include "NewBubbleCommunication.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+class BubbleModelBase
+{
+ public:
+ virtual ~BubbleModelBase() = default;
+
+ virtual real_t getDensity(IBlock* block, const Cell& cell) const = 0;
+ virtual void setDensity(IBlock* block, const Cell& cell, real_t value) = 0;
+ virtual void setDensityOfAllBubbles(real_t val) = 0;
+
+ // call updateVolumeDiff() with fillLevelDifference
+ virtual void reportFillLevelChange(IBlock* block, const Cell& cell, real_t fillLevelDifference) = 0;
+ virtual void reportLiquidToInterfaceConversion(IBlock* block, const Cell& cell) = 0;
+ virtual void reportInterfaceToLiquidConversion(IBlock* block, const Cell& cell) = 0;
+
+ virtual void update() = 0;
+}; // class BubbleModelBase
+
+/***********************************************************************************************************************
+ * Implementation for setups in which no bubble model is required. Reports always a constant pressure
+ **********************************************************************************************************************/
+class BubbleModelConstantPressure : public BubbleModelBase
+{
+ public:
+ BubbleModelConstantPressure(real_t constantLatticeDensity) : constantLatticeDensity_(constantLatticeDensity) {}
+ ~BubbleModelConstantPressure() override = default;
+
+ real_t getDensity(IBlock*, const Cell&) const override { return constantLatticeDensity_; }
+ void setDensity(IBlock*, const Cell&, real_t) override {}
+ void setDensityOfAllBubbles(real_t val) override { constantLatticeDensity_ = val; }
+
+ void reportFillLevelChange(IBlock*, const Cell&, real_t) override{};
+ void reportLiquidToInterfaceConversion(IBlock*, const Cell&) override{};
+ void reportInterfaceToLiquidConversion(IBlock*, const Cell&) override{};
+
+ void update() override {}
+
+ private:
+ real_t constantLatticeDensity_;
+}; // class BubbleModelConstantPressure
+
+/***********************************************************************************************************************
+ * System for tracking pressure/density in gas volumes.
+ *
+ * The pure volume of fluid code calculates how mass/fluid moves across the domain. As input it needs the gas density or
+ * pressure. The density is equal in the same bubble. To track the pressure, individual gas volumes have to be tracked.
+ * The bubbles can split or merge, can possibly range across multiple blocks and across multiple processes. The handling
+ * of this is implemented in this class.
+ **********************************************************************************************************************/
+template< typename Stencil_T >
+class BubbleModel : public BubbleModelBase
+{
+ public:
+ BubbleModel(const std::shared_ptr< StructuredBlockForest >& blockStorage, bool enableBubbleSplits);
+ ~BubbleModel() override = default;
+
+ // initialize bubble model from fill level field; bubble model is cleared and bubbles are created in cells with fill
+ // level less than 1
+ void initFromFillLevelField(const ConstBlockDataID& fillField);
+
+ void setDensityOfAllBubbles(real_t rho) override;
+
+ // mark the specified (gas) cell for belonging to the atmosphere bubble with constant pressure; the atmosphere's
+ // bubble ID is set to the highest ID that was found on any of the processes at cells that belong to the atmosphere;
+ // WARNING: This function must be called on all processes for the same cells, even if the cells are not located on
+ // the current block.
+ void setAtmosphere(const Cell& cellInGlobalCoordinates, real_t constantRho = real_c(1.0));
+
+ // accessing
+ real_t getDensity(IBlock* block, const Cell& cell) const override
+ {
+ // get the bubble containing cell
+ const Bubble* bubble = getBubble(block, cell);
+ WALBERLA_ASSERT_NOT_NULLPTR(bubble, "Cell " << cell << " does not belong to a bubble.");
+
+ return bubble->getDensity();
+ }
+
+ void setDensity(IBlock* block, const Cell& cell, real_t value) override
+ {
+ // get the bubble containing cell
+ Bubble* bubble = getBubble(block, cell);
+ WALBERLA_ASSERT_NOT_NULLPTR(bubble, "Cell " << cell << " does not belong to a bubble.");
+
+ bubble->setDensity(value);
+ }
+
+ const BubbleID& getBubbleID(IBlock* block, const Cell& cell) const;
+ BubbleID& getBubbleID(IBlock* block, const Cell& cell);
+
+ // cell and fill level update
+ void reportFillLevelChange(IBlock* block, const Cell& cell, real_t fillLevelDifference) override;
+
+ // assign a bubble ID (from the first found neighboring cell) to the newly created interface cell; if multiple bubble
+ // IDs are found in neighborhood, register a merge
+ void reportLiquidToInterfaceConversion(IBlock* block, const Cell& cell) override;
+
+ // invalidate the bubble ID of the converted liquid cell and check for bubble splits
+ void reportInterfaceToLiquidConversion(IBlock* block, const Cell& cell) override;
+
+ ConstBlockDataID getBubbleFieldID() const { return bubbleFieldID_; }
+
+ // combine information about a bubble
+ struct BubbleInfo
+ {
+ BubbleInfo() : nrOfCells(uint_c(0)) {}
+ Vector3< real_t > centerOfMass;
+ uint_t nrOfCells;
+ Bubble* bubble;
+ };
+
+ // compute bubbleInfo for each bubble and (MPI) reduce it on root
+ std::vector< BubbleInfo > computeBubbleStats();
+
+ // write bubbleInfo to terminal on root process
+ void logBubbleStatsOnRoot();
+
+ // update the bubble model:
+ // - communicate bubble ID field
+ // - merge and split bubbles (involves global MPI communications)
+ void update() override;
+
+ protected:
+ const Bubble* getBubble(IBlock* block, const Cell& cell) const;
+ Bubble* getBubble(IBlock* block, const Cell& cell);
+
+ const std::vector< Bubble >& getBubbles() const { return bubbles_; };
+
+ // check a 3x3x3 neighborhood whether a bubble could have split; calling is function is relatively inexpensive and
+ // can be used as indicator whether the more expensive extendedSplitCheck() makes sense
+ static bool checkForSplit(BubbleField_T* bf, const Cell& cell, BubbleID prevBubbleID);
+
+ // check "neighborhood" cells in each direction around "cell" to ensure that a bubble has really split
+ static bool extendedSplitCheck(BubbleField_T* bf, const Cell& cell, BubbleID oldBubbleID,
+ cell_idx_t neighborhood = 2);
+
+ using StencilForSplit_T =
+ typename std::conditional< Stencil_T::D == uint_t(2), stencil::D2Q9, stencil::D3Q27 >::type;
+
+ // split bubbles, assign new global bubble IDs, and handle potential bubble merges resulting from splitting (involves
+ // global MPI communication)
+ void handleSplits();
+
+ // delete potentially splitting bubbles and create new ones from them; new bubbles are added to newBubbleCom
+ void markAndCreateSplittedBubbles(NewBubbleCommunication& newBubbleComm, const std::vector< bool >& splitIndicator);
+
+ // in a 3x3x3 neighborhood, find all directions that are connected to startDir (by having same bubbleID) using a
+ // flood fill algorithm; flood fill is more efficient than simply iterating over all neighbors since the latter would
+ // require lots of extra logic
+ static uint32_t mapNeighborhood(BubbleField_T* bf, stencil::Direction startDir, const Cell& cell, BubbleID bubbleID);
+
+ // block storage to access bubbleField and fillField
+ std::shared_ptr< StructuredBlockStorage > blockStorage_;
+
+ // field that stores every cell's bubble ID; if a cell does not belong to any bubble, its ID is set to
+ // INVALID_BUBBLE_ID; this field is managed by the BubbleModel and should not be passed outside
+ BlockDataID bubbleFieldID_;
+
+ // vector that stores all bubbles; it is kept synchronized across all processes
+ std::vector< Bubble > bubbles_;
+
+ // helper class to manage bubble merges
+ MergeInformation mergeInformation_;
+
+ // communication scheme for the bubble field
+ blockforest::communication::UniformBufferedScheme< Stencil_T > bubbleFieldCommunication_;
+
+ // store split information, i.e., hints for splitting; store only hints since merges have to be processed first
+ struct SplitHint
+ {
+ SplitHint(IBlock* _block, const Cell& _cell) : block(_block), cell(_cell) {}
+ IBlock* block;
+ Cell cell;
+ };
+
+ // vector with outstanding splits that (still) need to be processed
+ std::vector< SplitHint > splitsToProcess_;
+
+ std::shared_ptr< FloodFillInterface > floodFill_;
+
+ // disable splits to decrease computational costs
+ bool enableBubbleSplits_;
+
+ inline BubbleField_T* getBubbleField(IBlock* block) const { return block->getData< BubbleField_T >(bubbleFieldID_); }
+
+}; // class BubbleModel
+
+} // namespace bubble_model
+} // namespace free_surface
+} // namespace walberla
+
+using walberla::free_surface::bubble_model::BubbleModelBase;
+
+#include "BubbleModel.impl.h"
diff --git a/src/lbm/free_surface/bubble_model/BubbleModel.impl.h b/src/lbm/free_surface/bubble_model/BubbleModel.impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..7ee915c2a5517379c1c13b605933740f9ff24127
--- /dev/null
+++ b/src/lbm/free_surface/bubble_model/BubbleModel.impl.h
@@ -0,0 +1,692 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file BubbleModel.impl.h
+//! \ingroup bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief System for tracking pressure/density in gas volumes.
+//
+//======================================================================================================================
+
+#include "field/AddToStorage.h"
+
+#include "lbm/free_surface/InterfaceFromFillLevel.h"
+
+#include "stencil/D2Q9.h"
+#include "stencil/D3Q27.h"
+
+#include "BubbleIDFieldPackInfo.h"
+#include "BubbleModel.h"
+#include "RegionalFloodFill.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+template< typename Stencil_T >
+BubbleModel< Stencil_T >::BubbleModel(const std::shared_ptr< StructuredBlockForest >& blockStorage,
+ bool enableBubbleSplits)
+ : blockStorage_(blockStorage), bubbleFieldID_(field::addToStorage< BubbleField_T >(
+ blockStorage, "BubbleIDs", BubbleID(INVALID_BUBBLE_ID), field::fzyx, uint_c(1))),
+ bubbleFieldCommunication_(blockStorage), enableBubbleSplits_(enableBubbleSplits)
+{
+ bubbleFieldCommunication_.addPackInfo(
+ std::make_shared< BubbleIDFieldPackInfo< Stencil_T > >(bubbleFieldID_, &mergeInformation_));
+}
+
+template< typename Stencil_T >
+void BubbleModel< Stencil_T >::initFromFillLevelField(const ConstBlockDataID& fillFieldID)
+{
+ // mark regions belonging to the same bubble
+ floodFill_ = std::make_shared< FloodFillUsingFillLevel< Stencil_T > >(fillFieldID);
+
+ bubbles_.clear();
+
+ NewBubbleCommunication newBubbleComm;
+
+ // start numbering the bubbles from 0
+ BubbleID firstNewBubbleID = 0;
+ BubbleID nextID = firstNewBubbleID;
+
+ for (auto blockIt = blockStorage_->begin(); blockIt != blockStorage_->end(); ++blockIt)
+ {
+ // get fields
+ const ScalarField_T* const fillField = blockIt->getData< const ScalarField_T >(fillFieldID);
+ BubbleField_T* const bubbleField = blockIt->getData< BubbleField_T >(bubbleFieldID_);
+
+ // initialize bubbleField with invalid IDs
+ bubbleField->set(INVALID_BUBBLE_ID);
+
+ auto bubbleIt = bubbleField->begin();
+ auto fillFieldIt = fillField->begin();
+
+ while (bubbleIt != bubbleField->end())
+ {
+ // only consider cells
+ // - that are either gas or interface
+ // - for which no bubble ID is set yet (each call to floodFill_->run() sets new bubbleIDs to cells)
+ if ((*fillFieldIt < real_c(1) || isInterfaceFromFillLevel< Stencil_T >(*fillField, bubbleIt.cell())) &&
+ *bubbleIt == INVALID_BUBBLE_ID)
+ {
+ real_t volume;
+ uint_t nrOfCells;
+
+ // set (block local, preliminary) bubble IDs in the bubble field
+ floodFill_->run(*blockIt, bubbleFieldID_, bubbleIt.cell(), nextID++, volume, nrOfCells);
+
+ // create new bubble with preliminary bubbleIDs; the final global bubbleIDs are set in communicateAndApply()
+ newBubbleComm.createBubble(Bubble(volume));
+ }
+
+ ++bubbleIt;
+ ++fillFieldIt;
+ }
+ }
+
+ // set global bubble IDs
+ newBubbleComm.communicateAndApply(bubbles_, *blockStorage_, bubbleFieldID_);
+
+ // clear merge information, i.e., make sure that no merge is already registered
+ mergeInformation_.resizeAndClear(bubbles_.size());
+
+ // communicate bubble field IDs
+ bubbleFieldCommunication_();
+
+ // communicate bubble merges
+ mergeInformation_.communicateMerges();
+
+ if (mergeInformation_.hasMerges())
+ {
+ // merge bubbles (add bubble volumes and delete/rename bubble IDs)
+ mergeInformation_.mergeAndReorderBubbleVector(bubbles_);
+
+ // rename bubble IDs on all blocks
+ for (auto blockIt = blockStorage_->begin(); blockIt != blockStorage_->end(); ++blockIt)
+ mergeInformation_.renameOnBubbleField(blockIt->getData< BubbleField_T >(bubbleFieldID_));
+ }
+
+ // clear merge information after bubbles have been merged
+ mergeInformation_.resizeAndClear(bubbles_.size());
+}
+
+template< typename Stencil_T >
+void BubbleModel< Stencil_T >::setDensityOfAllBubbles(real_t rho)
+{
+ for (auto it = bubbles_.begin(); it != bubbles_.end(); ++it)
+ {
+ if (!it->hasConstantDensity()) { it->setDensity(rho); }
+ }
+}
+
+template< typename Stencil_T >
+void BubbleModel< Stencil_T >::setAtmosphere(const Cell& cellInGlobalCoordinates, real_t rho)
+{
+ // temporarily set the atmosphere's bubble ID to invalid
+ BubbleID atmosphereBubbbleID = INVALID_BUBBLE_ID;
+
+ // get the cell's block (or nullptr if the block is not on this process)
+ IBlock* blockWithAtmosphereBubble = blockStorage_->getBlock(cellInGlobalCoordinates);
+
+ // set atmosphere bubble ID to this cell's bubble ID
+ if (blockWithAtmosphereBubble) // else: block does not exist locally
+ {
+ Cell localCell;
+ blockStorage_->transformGlobalToBlockLocalCell(localCell, *blockWithAtmosphereBubble, cellInGlobalCoordinates);
+
+ const BubbleField_T* const bf = blockWithAtmosphereBubble->getData< const BubbleField_T >(bubbleFieldID_);
+
+ // get this cell's bubble ID
+ atmosphereBubbbleID = bf->get(localCell);
+
+ // cell must be a gas cell; therefore, a valid bubble ID must be set
+ WALBERLA_ASSERT_UNEQUAL(atmosphereBubbbleID, INVALID_BUBBLE_ID);
+ }
+
+ // variable for (MPI) reducing the bubble ID; value of -1 is set in order to ignore this bubble in maximum reduction
+ int reducedBubbleID = atmosphereBubbbleID != INVALID_BUBBLE_ID ? int_c(atmosphereBubbbleID) : -1;
+
+ // get the highest of all processes' bubble IDs
+ WALBERLA_MPI_SECTION()
+ {
+ MPI_Allreduce(MPI_IN_PLACE, &reducedBubbleID, 1, MPITrait< int >::type(), MPI_MAX, MPI_COMM_WORLD);
+ }
+
+ if (reducedBubbleID < 0)
+ {
+ WALBERLA_LOG_WARNING_ON_ROOT("Could not set atmosphere in the non-gas cell " << cellInGlobalCoordinates);
+ }
+ else
+ {
+ // set atmosphere bubble ID to highest of all processes' bubble IDs
+ atmosphereBubbbleID = BubbleID(reducedBubbleID);
+ bubbles_[atmosphereBubbbleID].setConstantDensity(rho);
+ }
+}
+
+template< typename Stencil_T >
+const Bubble* BubbleModel< Stencil_T >::getBubble(IBlock* blockIt, const Cell& cell) const
+{
+ const BubbleField_T* bf = getBubbleField(blockIt);
+ const BubbleID id = bf->get(cell);
+
+ return (id == INVALID_BUBBLE_ID) ? nullptr : &bubbles_[id];
+}
+
+template< typename Stencil_T >
+Bubble* BubbleModel< Stencil_T >::getBubble(IBlock* blockIt, const Cell& cell)
+{
+ const BubbleField_T* bf = getBubbleField(blockIt);
+ const BubbleID id = bf->get(cell);
+
+ return (id == INVALID_BUBBLE_ID) ? nullptr : &bubbles_[id];
+}
+
+template< typename Stencil_T >
+const BubbleID& BubbleModel< Stencil_T >::getBubbleID(IBlock* blockIt, const Cell& cell) const
+{
+ const BubbleField_T* bf = getBubbleField(blockIt);
+ return bf->get(cell);
+}
+
+template< typename Stencil_T >
+BubbleID& BubbleModel< Stencil_T >::getBubbleID(IBlock* blockIt, const Cell& cell)
+{
+ BubbleField_T* bf = getBubbleField(blockIt);
+ return bf->get(cell);
+}
+
+template< typename Stencil_T >
+void BubbleModel< Stencil_T >::reportFillLevelChange(IBlock* blockIt, const Cell& cell, real_t fillLevelDifference)
+{
+ Bubble* b = getBubble(blockIt, cell);
+ WALBERLA_ASSERT_NOT_NULLPTR(b,
+ "Reporting fill level change in cell " << cell << " where no bubble ID is registered.");
+
+ // update the bubble volume change; fillLevelDifference is negated because variable is:
+ // - positive if fill level increased => bubble volume has to decrease
+ // - negative if fill level decreased => bubble volume has to increase
+ if (b) { b->updateVolumeDiff(-fillLevelDifference); }
+}
+
+template< typename Stencil_T >
+void BubbleModel< Stencil_T >::reportLiquidToInterfaceConversion(IBlock* blockIt, const Cell& cell)
+{
+ // get bubble field
+ BubbleField_T* bf = getBubbleField(blockIt);
+
+ // get this cell's bubble ID
+ BubbleID& thisCellID = bf->get(cell);
+
+ // this cell is converted from liquid to interface; liquid cells have no bubble ID such that this cell can not have
+ // a bubble ID, yet
+ WALBERLA_ASSERT_EQUAL(thisCellID, INVALID_BUBBLE_ID);
+
+ // iterate neighborhood and assign the first found bubble ID to this new interface cell
+ using SearchStencil_T = typename std::conditional< Stencil_T::D == uint_t(2), stencil::D2Q9, stencil::D3Q27 >::type;
+ for (auto d = SearchStencil_T::beginNoCenter(); d != SearchStencil_T::end(); ++d)
+ {
+ // get bubble ID of neighboring cell
+ BubbleID neighborID = bf->get(cell[0] + d.cx(), cell[1] + d.cy(), cell[2] + d.cz());
+ if (neighborID != INVALID_BUBBLE_ID)
+ {
+ // assign the first found neighbor's bubble ID to this cell
+ if (thisCellID == INVALID_BUBBLE_ID) { thisCellID = neighborID; }
+ else
+ {
+ // if multiple different bubble IDs are in neighborhood, trigger merging
+ if (thisCellID != neighborID) { mergeInformation_.registerMerge(thisCellID, neighborID); }
+ }
+ }
+ }
+}
+
+template< typename Stencil_T >
+void BubbleModel< Stencil_T >::reportInterfaceToLiquidConversion(IBlock* blockIt, const Cell& cell)
+{
+ // get bubble field
+ BubbleField_T* bf = getBubbleField(blockIt);
+
+ // get this cell's bubble ID
+ BubbleID oldBubbleID = bf->get(cell);
+
+ // this cell is converted from interface to liquid; the interface cell must already have a valid bubble ID
+ WALBERLA_ASSERT_UNEQUAL(oldBubbleID, INVALID_BUBBLE_ID);
+
+ // invalidate the converted cell's bubble ID (liquid cells must not have a bubble ID)
+ bf->get(cell) = INVALID_BUBBLE_ID;
+
+ if (enableBubbleSplits_)
+ {
+ // check a 3x3x3 neighborhood whether a bubble could have split
+ if (checkForSplit(bf, cell, oldBubbleID))
+ {
+ WALBERLA_LOG_INFO("Possible bubble split detected due to conversion in cell " << cell << ".");
+
+ // check a larger neighborhood to ensure that the bubble has really split
+ if (extendedSplitCheck(bf, cell, oldBubbleID, cell_idx_c(3)))
+ {
+ WALBERLA_LOG_INFO("Extended split check confirmed split.");
+ // register this bubble split
+ splitsToProcess_.emplace_back(blockIt, cell);
+ }
+ else { WALBERLA_LOG_INFO("Extended split check ruled out split."); }
+ }
+ }
+}
+
+template< typename Stencil_T >
+void BubbleModel< Stencil_T >::update()
+{
+ // communicate field with bubble IDs
+ bubbleFieldCommunication_();
+
+ // vector for (MPI) reducing each bubble's volume change and indicators for whether merges and splits occurred
+ static std::vector< real_t > reduceVector;
+
+ // indicators that are (MPI) reduced to identify merges and splits
+ real_t mergeIndicator = mergeInformation_.hasMerges() ? real_c(1) : real_c(0);
+ real_t splitIndicator = splitsToProcess_.empty() ? real_c(0) : real_c(1);
+
+ // extend the vector for storing the merge and split indicator
+ reduceVector.resize(bubbles_.size() + 2);
+
+ uint_t i = uint_c(0);
+ for (; i < bubbles_.size(); ++i)
+ {
+ // get each bubble's volume change
+ reduceVector[i] = bubbles_[i].getAndResetVolumeDiff();
+ }
+
+ // append the indicators at the end of reduceVector
+ reduceVector[i++] = mergeIndicator;
+ reduceVector[i++] = splitIndicator;
+ WALBERLA_ASSERT_EQUAL(i, reduceVector.size()); // make sure that indexing is correct
+
+ WALBERLA_MPI_SECTION()
+ {
+ // globally (MPI) reduce each bubble's volume change, the number of merges, and the number of splits
+ MPI_Allreduce(MPI_IN_PLACE, &reduceVector[0], int_c(reduceVector.size()), MPITrait< real_t >::type(), MPI_SUM,
+ MPI_COMM_WORLD);
+ }
+
+ uint_t j = uint_c(0);
+ for (; j < bubbles_.size(); ++j)
+ {
+ // update each bubble's volume and density
+ bubbles_[j].applyVolumeDiff(reduceVector[j]);
+ }
+
+ // check for merges and splits
+ bool mergeHappened = (reduceVector[j++] > real_c(0));
+ bool splitHappened = (reduceVector[j++] > real_c(0));
+ WALBERLA_ASSERT_EQUAL(j, reduceVector.size()); // make sure that indexing is correct
+
+ // treat bubble merges
+ if (mergeHappened)
+ {
+ WALBERLA_ROOT_SECTION()
+ {
+ // std::stringstream ss;
+ // mergeInformation_.print(ss);
+ // WALBERLA_LOG_INFO("Merge detected, " << ss.str());
+ WALBERLA_LOG_INFO("Merge detected");
+ }
+
+ // globally communicate bubble merges and rename bubble IDs accordingly
+ mergeInformation_.communicateMerges();
+
+ // merge bubbles
+ mergeInformation_.mergeAndReorderBubbleVector(bubbles_);
+
+ // update, i.e., rename bubble IDs in the bubble ID field
+ for (auto blockIt = blockStorage_->begin(); blockIt != blockStorage_->end(); ++blockIt)
+ {
+ mergeInformation_.renameOnBubbleField(getBubbleField(&(*blockIt)));
+ }
+ }
+
+ // treat bubble splits
+ if (splitHappened) { handleSplits(); }
+
+ mergeInformation_.resizeAndClear(bubbles_.size());
+ splitsToProcess_.clear();
+}
+
+template< typename Stencil_T >
+bool BubbleModel< Stencil_T >::checkForSplit(BubbleField_T* bf, const Cell& cell, BubbleID previousBubbleID)
+{
+ using namespace stencil;
+
+ // Variable neighborHoodInfo has bits set in each connected neighboring direction where the cell belongs to bubble
+ // previousBubbleID (=ID of the bubble that got "lost" by converting cell from interface to liquid). The
+ // neighborHoodInfo is built via flood fill exactly once from a starting direction (e.g., first direction in which
+ // previousBubbleID was found). Thus, the connected neighborhood is built for only one direction and cells that
+ // are not connected to this starting direction are not part of the connected neighborhood. A split occurs, i.e., is
+ // detected when previousBubbleID is found in an unconnected region.
+ // Example:
+ // previousBubbleID is 1, the cells in the center were converted from bubble ID=1 to liquid (ID=f)
+ // 1 1 1
+ // f f f
+ // 1 1 1
+ // The first direction in which previousBubbleID is set shall be N (north). The connected neighborhood is then built
+ // (c=connected, n=not connected):
+ // c c c
+ // n n n
+ // n n n
+ // At neighbor N, neighbors NW and NE are found: no split is detected since we are in the connected neighborhood.
+ // Then, neighbor S is found. Since S is not in the (first) connected neighborhood, a split is detected.
+ uint32_t neighborHoodInfo = uint32_c(0);
+
+ for (auto d = StencilForSplit_T::beginNoCenter(); d != StencilForSplit_T::end(); ++d)
+ {
+ // get the bubble ID of the neighboring cell
+ BubbleID neighborID = bf->getNeighbor(cell, *d);
+
+ // neighboring bubble is a different one (or no bubble) than this cell's bubble
+ if (neighborID != previousBubbleID) { continue; }
+ // => from here: bubbles are the same, i.e., neighborID == previousBubbleID
+
+ if (neighborHoodInfo > uint32_c(0)) // the neighborhood map has already been created
+ {
+ // "connected" bit is set in this direction, i.e., the neighbor is connected
+ if (neighborHoodInfo & dirToBinary[*d]) { continue; }
+ else // "connected" bit is not set in this direction, i.e., the neighbor is not connected
+ {
+ // since neighborID == previousBubbleID but neighbor is not connected, a split had to occur
+ return true;
+ }
+ }
+ else // the neighborhood map has not been created, yet
+ {
+ // create connected neighborhood starting from direction d
+ neighborHoodInfo = mapNeighborhood(bf, *d, cell, neighborID);
+ }
+ }
+ return false;
+}
+
+template< typename Stencil_T >
+bool BubbleModel< Stencil_T >::extendedSplitCheck(BubbleField_T* bf, const Cell& cell, BubbleID previousBubbleID,
+ cell_idx_t neighborhood)
+{
+ // RegionalFloodFill is used to find connected regions in a larger (>3x3x3) neighborhood
+ RegionalFloodFill< BubbleID, StencilForSplit_T >* neighborHoodInfo = nullptr;
+
+ for (auto d = StencilForSplit_T::beginNoCenter(); d != StencilForSplit_T::end(); ++d)
+ {
+ // get the bubble ID of the neighboring cell
+ BubbleID neighborID = bf->getNeighbor(cell, *d);
+
+ // neighboring bubble is a different one (or no bubble) than this cell's bubble
+ if (neighborID != previousBubbleID) { continue; }
+ // => from here: bubbles are the same, i.e., neighborID == previousBubbleID
+
+ if (neighborHoodInfo) // the neighborhood map has already been created
+ {
+ if (neighborHoodInfo->connected(*d)) { continue; }
+ else // bubble is not connected in direction d and a split occurred
+ {
+ delete neighborHoodInfo;
+ return true;
+ }
+ }
+ else // the neighborhood map has not been created, yet
+ {
+ // create connected neighborhood starting from direction d
+ neighborHoodInfo =
+ new RegionalFloodFill< BubbleID, StencilForSplit_T >(bf, cell, *d, neighborID, neighborhood);
+ }
+ }
+
+ delete neighborHoodInfo;
+ return false;
+}
+
+template< typename Stencil_T >
+uint32_t BubbleModel< Stencil_T >::mapNeighborhood(BubbleField_T* bf, stencil::Direction startDir, const Cell& cell,
+ BubbleID bubbleID)
+{
+ using namespace stencil;
+
+ uint32_t result = uint32_c(0);
+
+ // use stack to store directions that still need to be searched
+ std::vector< Direction > stack;
+ stack.push_back(startDir);
+
+ while (!stack.empty())
+ {
+ // next search direction is the last entry in stack
+ Direction d = stack.back();
+
+ // remove the current search direction from stack
+ stack.pop_back();
+
+ WALBERLA_ASSERT(d != C); // do not search in center direction
+ WALBERLA_ASSERT(bf->get(cell[0] + cx[d], cell[1] + cy[d], cell[2] + cz[d]) ==
+ bubbleID); // cell must belong to the same bubble
+
+ // add this direction to result, i.e., to the "connected neighborhood" using bitwise OR
+ result |= dirToBinary[d];
+
+ // in direction d, iterate over d's neighboring directions i, i.e., iterate over a (at maximum) 3x3x3 neighborhood
+ // from the viewpoint of cell
+ for (uint_t i = uint_c(1); i < StencilForSplit_T::dir_neighbors_length[d]; ++i)
+ {
+ // transform direction d's neighbor in direction i to a direction from the viewpoint of cell, e.g., d=N, i=W =>
+ // nDir=NW
+ Direction nDir = StencilForSplit_T::dir_neighbors[d][i];
+
+ // cell in direction nDir belongs to the bubble and is not already in result
+ if (bf->get(cell[0] + cx[nDir], cell[1] + cy[nDir], cell[2] + cz[nDir]) == bubbleID &&
+ (result & dirToBinary[nDir]) == 0)
+ {
+ // add nDir to stack such that it gets added to result and used as start cell in the next iteration;
+ // the connected bit will never be set for directions that are not connected to startDir
+ stack.push_back(nDir);
+ }
+ }
+ }
+
+ return result;
+}
+
+template< typename Stencil_T >
+void BubbleModel< Stencil_T >::handleSplits()
+{
+ // splitIndicator is set to true for bubbles for which a split was registered; this can not be done earlier since
+ // bubble IDs may have changed during merging
+ std::vector< bool > splitIndicator(bubbles_.size());
+
+ // process all registered splits
+ for (auto i = splitsToProcess_.begin(); i != splitsToProcess_.end(); ++i)
+ {
+ BubbleField_T* bubbleField = getBubbleField(i->block);
+
+ const Cell& c = i->cell;
+
+ // cell c was transformed from interface to liquid and has no valid bubble ID anymore; mark remaining gas cells
+ // with valid bubble IDs for being split
+ for (auto d = StencilForSplit_T::begin(); d != StencilForSplit_T::end(); ++d)
+ {
+ BubbleID id = bubbleField->get(c.x() + d.cx(), c.y() + d.cy(), c.z() + d.cz());
+
+ // mark bubble's cell for splitting in splitIndicator
+ if (id != INVALID_BUBBLE_ID) { splitIndicator[id] = true; }
+ }
+ }
+
+ // communicate (MPI reduce) splitIndicator among all processes
+ allReduceInplace(splitIndicator, mpi::BITWISE_OR);
+
+ // create communication for new bubbles
+ NewBubbleCommunication newBubbleComm(bubbles_.size());
+
+ // treat split and create new (splitted) bubbles with new IDs
+ markAndCreateSplittedBubbles(newBubbleComm, splitIndicator);
+
+ // communicate all bubbles and assign new global bubble IDs
+ newBubbleComm.communicateAndApply(bubbles_, splitIndicator, *blockStorage_, bubbleFieldID_);
+
+ // clear merge information
+ mergeInformation_.resizeAndClear(bubbles_.size());
+
+ // communicate bubble field
+ bubbleFieldCommunication_();
+
+ // communicate merges
+ mergeInformation_.communicateMerges();
+
+ // merge new splitted bubbles (merges can occur at the block border after the bubbleField was communicated;
+ // bubbleFieldCommunication is linked to mergeInformation_ to report the merges there)
+ if (mergeInformation_.hasMerges())
+ {
+ // merge bubbles
+ mergeInformation_.mergeAndReorderBubbleVector(bubbles_);
+ for (auto blockIt = blockStorage_->begin(); blockIt != blockStorage_->end(); ++blockIt)
+ {
+ // assign new bubble IDs
+ mergeInformation_.renameOnBubbleField(blockIt->getData< BubbleField_T >(bubbleFieldID_));
+ }
+ }
+
+ // clear merge information
+ mergeInformation_.resizeAndClear(bubbles_.size());
+}
+
+template< typename Stencil_T >
+void BubbleModel< Stencil_T >::markAndCreateSplittedBubbles(NewBubbleCommunication& newBubbleComm,
+ const std::vector< bool >& splitIndicator)
+{
+ for (auto blockIt = blockStorage_->begin(); blockIt != blockStorage_->end(); ++blockIt)
+ {
+ BubbleField_T* bubbleField = getBubbleField(&(*blockIt));
+
+ // loop over the whole domain and start a flood fill at positions where bubbles are marked in splitIndicator
+ for (auto bubbleIt = bubbleField->begin(); bubbleIt != bubbleField->end(); ++bubbleIt)
+ {
+ // skip cells that
+ // - do not belong to a bubble
+ // - belong to a bubble that might have been created during this function call (i.e., this bubble ID is not yet
+ // known to the vector spliIndicator)
+ // - belong to a bubble for which no split was detected
+ if (*bubbleIt == INVALID_BUBBLE_ID || *bubbleIt >= splitIndicator.size() || !splitIndicator[*bubbleIt])
+ {
+ continue;
+ }
+
+ const Cell& curCell = bubbleIt.cell();
+ real_t densityOfOldBubble = getDensity(&(*blockIt), curCell);
+ real_t volume;
+ uint_t nrOfCells;
+
+ // mark the whole region of the bubble (to which this cells belongs) in bubbleField
+ floodFill_->run(*blockIt, bubbleFieldID_, curCell, newBubbleComm.nextFreeBubbleID(), volume, nrOfCells);
+
+ // create new bubble
+ newBubbleComm.createBubble(Bubble(volume, densityOfOldBubble));
+ }
+ }
+}
+
+template< typename Stencil_T >
+std::vector< typename BubbleModel< Stencil_T >::BubbleInfo > BubbleModel< Stencil_T >::computeBubbleStats()
+{
+ std::vector< BubbleInfo > bubbleStats;
+ bubbleStats.assign(bubbles_.size(), BubbleInfo());
+
+ // iterate all bubbles on each block
+ for (auto blockIt = blockStorage_->begin(); blockIt != blockStorage_->end(); ++blockIt)
+ {
+ const BubbleField_T* bubbleField = getBubbleField(&(*blockIt));
+ WALBERLA_FOR_ALL_CELLS(bubbleFieldIt, bubbleField, {
+ if (*bubbleFieldIt == INVALID_BUBBLE_ID) { continue; }
+
+ Vector3< real_t > cellCenter;
+ Cell globalCell;
+ blockStorage_->transformBlockLocalToGlobalCell(globalCell, *blockIt, bubbleFieldIt.cell());
+ blockStorage_->getCellCenter(cellCenter[0], cellCenter[1], cellCenter[2], globalCell);
+
+ // center of mass of this bubble on this block
+ bubbleStats[*bubbleFieldIt].centerOfMass += cellCenter;
+
+ // bubble's number of cells
+ bubbleStats[*bubbleFieldIt].nrOfCells++;
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ // store bubble information in reduceVec; reducing a vector of real_t is significantly easier than reducing
+ // bubbleStats (vector of bubbleInfo)
+ std::vector< real_t > reduceVec;
+ for (auto statsIter = bubbleStats.begin(); statsIter != bubbleStats.end(); ++statsIter)
+ {
+ reduceVec.push_back(statsIter->centerOfMass[0]);
+ reduceVec.push_back(statsIter->centerOfMass[1]);
+ reduceVec.push_back(statsIter->centerOfMass[2]);
+ reduceVec.push_back(real_c(statsIter->nrOfCells));
+ }
+
+ // (MPI) reduce bubble information on root
+ mpi::reduceInplace(reduceVec, mpi::SUM, 0, MPI_COMM_WORLD);
+
+ WALBERLA_ROOT_SECTION()
+ {
+ uint_t idx = uint_c(0);
+ uint_t i = uint_c(0);
+ for (auto statsIter = bubbleStats.begin(); statsIter != bubbleStats.end(); ++statsIter)
+ {
+ statsIter->centerOfMass[0] = reduceVec[idx++];
+ statsIter->centerOfMass[1] = reduceVec[idx++];
+ statsIter->centerOfMass[2] = reduceVec[idx++];
+ statsIter->nrOfCells = uint_c(reduceVec[idx++]);
+
+ // compute the bubble's global center of mass
+ statsIter->centerOfMass /= real_c(statsIter->nrOfCells);
+
+ // store the bubble ID
+ statsIter->bubble = &(bubbles_[i]);
+ ++i;
+ }
+ WALBERLA_ASSERT_EQUAL(idx, reduceVec.size());
+
+ return bubbleStats;
+ }
+ else // else belongs to macro WALBERLA_ROOT_SECTION()
+ {
+ return std::vector< BubbleInfo >();
+ }
+}
+
+template< typename Stencil_T >
+void BubbleModel< Stencil_T >::logBubbleStatsOnRoot()
+{
+ std::vector< BubbleInfo > bubbleStats = computeBubbleStats();
+
+ WALBERLA_ROOT_SECTION()
+ {
+ WALBERLA_LOG_RESULT("Bubble Status:");
+ for (auto it = bubbleStats.begin(); it != bubbleStats.end(); ++it)
+ {
+ WALBERLA_LOG_RESULT("\tPosition:" << it->centerOfMass << " #Cells: " << it->nrOfCells);
+ }
+ }
+}
+
+} // namespace bubble_model
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/bubble_model/BubbleModelFromConfig.h b/src/lbm/free_surface/bubble_model/BubbleModelFromConfig.h
new file mode 100644
index 0000000000000000000000000000000000000000..dfd86821b9828fbd2a1791469f11a43643e0f506
--- /dev/null
+++ b/src/lbm/free_surface/bubble_model/BubbleModelFromConfig.h
@@ -0,0 +1,75 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file BubbleModelFromConfig.h
+//! \ingroup bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Create and initialize BubbleModel with information from a config object.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/config/Config.h"
+
+#include "BubbleModel.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+/***********************************************************************************************************************
+* Create and initialize BubbleModel with information from a config object.
+*
+* Example configuration block:
+* \verbatim
+ {
+ // For scenarios where no splits can occur - expensive split detection can be switched off - defaults to False
+ enableBubbleSplits False;
+
+ // optional atmosphere block(s) : Atmosphere bubbles are bubbles with constant pressure
+ atmosphere {
+ position < 1.5, 175.5, 1 >; // a point inside the bubble that should becomes atmosphere
+ density 1.1; // the value of constant pressure. Default value: 1.0
+ }
+
+ // optional disjoining pressure
+ // Disjoining pressure model holds bubbles apart that are close to each other
+ DisjoiningPressure
+ {
+ maxDisjoiningPressure 0.1; // maximum value of disjoining pressure - defaults to 0.2
+ maxDistance 4; // for bubbles with distance greater 'maxDistance' cells
+ // there is no disjoining pressure - defaults to 10 cells
+ }
+ }
+ \endverbatim
+*
+*
+* The fill level field must be fully initialized.
+* If the handle of the config block returns nullptr, the bubble model is created with default values.
+***********************************************************************************************************************/
+template< typename Stencil_T >
+std::shared_ptr< BubbleModelBase > createFromConfig(const std::shared_ptr< StructuredBlockForest >& blockStorage,
+ ConstBlockDataID fillFieldID,
+ const Config::BlockHandle& configBlock = Config::BlockHandle());
+
+} // namespace bubble_model
+} // namespace free_surface
+} // namespace walberla
+
+#include "BubbleModelFromConfig.impl.h"
\ No newline at end of file
diff --git a/src/lbm/free_surface/bubble_model/BubbleModelFromConfig.impl.h b/src/lbm/free_surface/bubble_model/BubbleModelFromConfig.impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..4ffa219cb59d7a121cf568369f8e866571e35114
--- /dev/null
+++ b/src/lbm/free_surface/bubble_model/BubbleModelFromConfig.impl.h
@@ -0,0 +1,91 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file BubbleModelFromConfig.impl.h
+//! \ingroup bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Create and initialize BubbleModel with information from a config object.
+//
+//======================================================================================================================
+
+#include "BubbleModelFromConfig.h"
+#include "DisjoiningPressureBubbleModel.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+template< typename Stencil_T >
+std::shared_ptr< BubbleModelBase > createFromConfig(const std::shared_ptr< StructuredBlockForest >& blockForest,
+ ConstBlockDataID fillFieldID,
+ const Config::BlockHandle& configBlock)
+{
+ if (!configBlock)
+ {
+ auto bubbleModel = std::make_shared< BubbleModel< Stencil_T > >(blockForest);
+ bubbleModel->initFromFillLevelField(fillFieldID);
+ return bubbleModel;
+ }
+
+ bool enableBubbleSplits = configBlock.getParameter< bool >("enableBubbleSplits", false);
+
+ std::shared_ptr< BubbleModel< Stencil_T > > bubbleModel;
+
+ real_t constantLatticeDensity = configBlock.getParameter< real_t >("constantLatticeDensity", real_c(-1));
+ if (constantLatticeDensity > 0) { return std::make_shared< BubbleModelConstantPressure >(constantLatticeDensity); }
+
+ auto disjoiningPressureCfg = configBlock.getBlock("DisjoiningPressure");
+ if (disjoiningPressureCfg)
+ {
+ const real_t maxDistance = disjoiningPressureCfg.getParameter< real_t >(
+ "maxBubbleDistance"); // d_range in the paper from Koerner et al., 2005
+ const real_t disjoiningPressureConstant = disjoiningPressureCfg.getParameter< real_t >(
+ "disjoiningPressureConstant"); // c_pi in the paper from Koerner et al., 2005
+ const uint_t distFieldUpdateInter = disjoiningPressureCfg.getParameter< uint_t >("distanceFieldUpdateInterval");
+
+ bubbleModel = std::make_shared< DisjoiningPressureBubbleModel< Stencil_T > >(
+ blockForest, maxDistance, disjoiningPressureConstant, enableBubbleSplits, distFieldUpdateInter);
+
+ WALBERLA_LOG_PROGRESS_ON_ROOT("Using Disjoining Pressure BubbleModel");
+ }
+ else
+ {
+ bubbleModel = std::make_shared< bubble_model::BubbleModel< Stencil_T > >(blockForest, enableBubbleSplits);
+ WALBERLA_LOG_PROGRESS_ON_ROOT("Using Standard BubbleModel");
+ }
+
+ bubbleModel->initFromFillLevelField(fillFieldID);
+
+ // get all atmosphere blocks
+ std::vector< Config::BlockHandle > atmosphereBlocks;
+ configBlock.getBlocks("atmosphere", atmosphereBlocks);
+ for (auto it = atmosphereBlocks.begin(); it != atmosphereBlocks.end(); ++it)
+ {
+ Vector3< real_t > position = it->getParameter< Vector3< real_t > >("position");
+ real_t density = it->getParameter< real_t >("density", 1.0);
+ Cell cell;
+ blockForest->getCell(cell, position[0], position[1], position[2]);
+ bubbleModel->setAtmosphere(cell, density);
+ }
+
+ return bubbleModel;
+}
+
+} // namespace bubble_model
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/bubble_model/CMakeLists.txt b/src/lbm/free_surface/bubble_model/CMakeLists.txt
new file mode 100644
index 0000000000000000000000000000000000000000..712930e3823899d801b4b1b60b16cbdf4cf9b478
--- /dev/null
+++ b/src/lbm/free_surface/bubble_model/CMakeLists.txt
@@ -0,0 +1,24 @@
+target_sources( lbm
+ PRIVATE
+ Bubble.h
+ BubbleDefinitions.h
+ BubbleDistanceAdaptor.h
+ BubbleIDFieldPackInfo.h
+ BubbleModel.h
+ BubbleModel.impl.h
+ BubbleModelFromConfig.h
+ BubbleModelFromConfig.impl.h
+ DisjoiningPressureBubbleModel.h
+ DisjoiningPressureBubbleModel.impl.h
+ DistanceInfo.cpp
+ DistanceInfo.h
+ FloodFill.h
+ FloodFill.impl.h
+ Geometry.h
+ Geometry.impl.h
+ MergeInformation.cpp
+ MergeInformation.h
+ NewBubbleCommunication.cpp
+ NewBubbleCommunication.h
+ RegionalFloodFill.h
+ )
diff --git a/src/lbm/free_surface/bubble_model/DisjoiningPressureBubbleModel.h b/src/lbm/free_surface/bubble_model/DisjoiningPressureBubbleModel.h
new file mode 100644
index 0000000000000000000000000000000000000000..278536feee3fb0df7213959528365980037b105b
--- /dev/null
+++ b/src/lbm/free_surface/bubble_model/DisjoiningPressureBubbleModel.h
@@ -0,0 +1,142 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file DisjoiningPressureBubbleModel.h
+//! \ingroup bubble_model
+//! \author Daniela Anderl
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Bubble Model with additional pressure term (disjoining pressure).
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "field/GhostLayerField.h"
+
+#include <cmath>
+
+#include "BubbleModel.h"
+#include "DistanceInfo.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+/***********************************************************************************************************************
+ * Bubble Model with additional pressure term (disjoining pressure) which depends on distance to the nearest bubble. The
+ * disjoining pressure is computed as in the paper from Koerner et al., 2005, where variable
+ * - "disjPressConst_" is called "c_pi"
+ * - "maxDistance_" is called "d_range"
+ * - "dist" is called "d_int".
+ *
+ * Be aware that the value of the first two variables are phenomenological, i.e., they have to be chosen according to
+ * comparisons with experiments. The current default values are more or less randomly chosen.
+ **********************************************************************************************************************/
+template< typename Stencil_T >
+class DisjoiningPressureBubbleModel : public BubbleModel< Stencil_T >
+{
+ public:
+ using DistanceField_T = GhostLayerField< DistanceInfo, 1 >;
+
+ explicit DisjoiningPressureBubbleModel(const std::shared_ptr< StructuredBlockForest >& blockStorage,
+ const real_t maxDistance = real_c(7),
+ const real_t disjPressConst = real_c(0.05), bool enableBubbleSplits = true,
+ uint_t distanceFieldUpdateInterval = uint_c(1));
+
+ ~DisjoiningPressureBubbleModel() override = default;
+
+ // compute the gas density with disjoining pressure according to the paper from Koerner et al., 2005
+ real_t getDensity(IBlock* block, const Cell& cell) const override
+ {
+ // get bubble field and bubble ID
+ const BubbleField_T* bf = BubbleModel< Stencil_T >::getBubbleField(block);
+ const BubbleID id = bf->get(cell);
+
+ WALBERLA_ASSERT_UNEQUAL(id, INVALID_BUBBLE_ID, "Cell " << cell << " does not contain a bubble.");
+
+ const real_t gasDensity = BubbleModel< Stencil_T >::bubbles_[id].getDensity();
+
+ // cache a pointer to the block and to the distance field since block->getData<DistanceField>() is expensive
+ static IBlock* blockCache = nullptr;
+ static DistanceField_T* distField = nullptr;
+
+ // update cache
+ if (block != blockCache)
+ {
+ blockCache = block;
+ distField = block->getData< DistanceField_T >(distanceFieldSrcID_);
+ }
+
+ const DistanceInfo& distanceInfo = distField->get(cell);
+
+ // get the distance to the nearest neighboring interface cell from a different bubble
+ const real_t dist = distanceInfo.getDistanceToNearestBubble(id, maxDistance_);
+
+ real_t disjoiningPressure = real_c(0.0);
+
+ // computation of disjoining pressure according to the paper from Koerner et al., 2005 where variable
+ // - "disjPressConst_" is called "c_pi"
+ // - "maxDistance_" is called "d_range"
+ // - "dist" is called "d_int"
+ if (dist > maxDistance_)
+ {
+ // disjoining pressure is zero for bubbles outside of range "maxDistance"
+ disjoiningPressure = real_c(0);
+ }
+ else
+ {
+ // disjoining pressure as Koerner et al., 2005
+ disjoiningPressure = disjPressConst_ * real_c(std::fabs(maxDistance_ - dist));
+ }
+
+ return gasDensity - disjoiningPressure;
+ }
+
+ // update the bubble model
+ void update() override
+ {
+ static uint_t step = uint_c(0);
+
+ // update the distance field
+ if (step % distanceFieldUpdateInterval_ == 0) updateDistanceField();
+
+ // update regular bubble model
+ BubbleModel< Stencil_T >::update();
+
+ ++step;
+ }
+
+ ConstBlockDataID getDistanceFieldID() { return distanceFieldSrcID_; }
+
+ protected:
+ void updateDistanceField();
+
+ real_t maxDistance_; // d_range in the paper from Koerner et al., 2005
+ real_t disjPressConst_; // c_pi in the paper from Koerner et al., 2005
+
+ BlockDataID distanceFieldSrcID_;
+ BlockDataID distanceFieldDstID_;
+
+ uint_t distanceFieldUpdateInterval_;
+}; // class DisjoiningPressureBubbleModel
+
+} // namespace bubble_model
+} // namespace free_surface
+} // namespace walberla
+
+#include "DisjoiningPressureBubbleModel.impl.h"
diff --git a/src/lbm/free_surface/bubble_model/DisjoiningPressureBubbleModel.impl.h b/src/lbm/free_surface/bubble_model/DisjoiningPressureBubbleModel.impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..6f8e4221816332bb82e1d6c61230a1dedb343b33
--- /dev/null
+++ b/src/lbm/free_surface/bubble_model/DisjoiningPressureBubbleModel.impl.h
@@ -0,0 +1,83 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file DisjoiningPressureBubbleModel.impl.h
+//! \ingroup bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Bubble Model with additional pressure term (disjoining pressure).
+//
+//======================================================================================================================
+
+#include "field/AddToStorage.h"
+#include "field/communication/PackInfo.h"
+
+#include "DisjoiningPressureBubbleModel.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+template< typename Stencil_T >
+DisjoiningPressureBubbleModel< Stencil_T >::DisjoiningPressureBubbleModel(
+ const std::shared_ptr< StructuredBlockForest >& blockStorage, real_t maxDistance, real_t disjPressConst,
+ bool enableBubbleSplits, uint_t distanceFieldUpdateInterval)
+ : BubbleModel< Stencil_T >(blockStorage, enableBubbleSplits), maxDistance_(maxDistance),
+ disjPressConst_(disjPressConst), distanceFieldSrcID_(field::addToStorage< DistanceField_T >(
+ blockStorage, "BubbleDistance Src", DistanceInfo(), field::fzyx, uint_c(1))),
+ distanceFieldDstID_(field::addToStorage< DistanceField_T >(blockStorage, "BubbleDistance Dst", DistanceInfo(),
+ field::fzyx, uint_c(1))),
+ distanceFieldUpdateInterval_(distanceFieldUpdateInterval)
+{
+ BubbleModel< Stencil_T >::bubbleFieldCommunication_.addPackInfo(
+ std::make_shared< field::communication::PackInfo< DistanceField_T > >(distanceFieldSrcID_));
+}
+
+template< typename Stencil_T >
+void DisjoiningPressureBubbleModel< Stencil_T >::updateDistanceField()
+{
+ for (auto blockIt = BubbleModel< Stencil_T >::blockStorage_->begin();
+ blockIt != BubbleModel< Stencil_T >::blockStorage_->end(); ++blockIt)
+ {
+ // get fields
+ const BubbleField_T* const bubbleField =
+ blockIt->template getData< const BubbleField_T >(BubbleModel< Stencil_T >::getBubbleFieldID());
+ DistanceField_T* const distSrcField = blockIt->template getData< DistanceField_T >(distanceFieldSrcID_);
+ DistanceField_T* const distDstField = blockIt->template getData< DistanceField_T >(distanceFieldDstID_);
+
+ WALBERLA_FOR_ALL_CELLS(distDstIt, distDstField, distSrcIt, distSrcField, bubbleIt, bubbleField, {
+ distDstIt->clear();
+
+ // if current cell is part of a bubble, set the distance to zero
+ if (*bubbleIt != INVALID_BUBBLE_ID) { distDstIt->setToZero(*bubbleIt); }
+
+ // loop over src field neighborhood and combine them into this cell
+ for (auto d = Stencil_T::beginNoCenter(); d != Stencil_T::end(); ++d)
+ {
+ // sum distance with already known distances from neighborhood
+ distDstIt->combine(distSrcIt.neighbor(*d), d.length(), maxDistance_);
+ }
+ }); // WALBERLA_FOR_ALL_CELLS
+
+ // swap pointers to distance fields
+ distSrcField->swapDataPointers(*distDstField);
+ }
+}
+
+} // namespace bubble_model
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/bubble_model/DistanceInfo.cpp b/src/lbm/free_surface/bubble_model/DistanceInfo.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..db90cae4cda8d7dd3dad37b75338fb43696ccbd9
--- /dev/null
+++ b/src/lbm/free_surface/bubble_model/DistanceInfo.cpp
@@ -0,0 +1,112 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file DistanceInfo.cpp
+//! \ingroup bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Compute the distances between bubbles.
+//
+//======================================================================================================================
+
+#include "DistanceInfo.h"
+
+#include "core/mpi/BufferDataTypeExtensions.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+mpi::SendBuffer& operator<<(mpi::SendBuffer& buf, const DistanceInfo& di)
+{
+ buf << di.bubbleInfos_;
+ return buf;
+}
+
+mpi::RecvBuffer& operator>>(mpi::RecvBuffer& buf, DistanceInfo& di)
+{
+ di.clear();
+ buf >> di.bubbleInfos_;
+ return buf;
+}
+
+real_t DistanceInfo::getDistanceToNearestBubble(const BubbleID& ownID, real_t maxDistance) const
+{
+ // limit search region to maxDistance
+ real_t minDistance = maxDistance;
+
+ // find the minimum distance
+ for (auto it = bubbleInfos_.begin(); it != bubbleInfos_.end(); it++)
+ {
+ if (minDistance > it->second && it->first != ownID) { minDistance = it->second; }
+ }
+
+ return minDistance;
+}
+
+void DistanceInfo::combine(const DistanceInfo& other, real_t linkDistance, real_t maxDistance)
+{
+ // sum of another cell's distance to the nearest bubble and linkDistance
+ real_t sumDistance = real_c(0);
+
+ // loop over the "bubbleInfos" (std::map) of another cell
+ for (auto it = other.bubbleInfos_.begin(); it != other.bubbleInfos_.end(); it++)
+ {
+ // the other cell's bubble is not in contained in this cell's bubbleInfos, yet
+ if (bubbleInfos_.find(it->first) == bubbleInfos_.end())
+ {
+ sumDistance = it->second + linkDistance;
+
+ // add an entry for the other cell's nearest bubble, if the summed distance is below maxDistance
+ if (sumDistance < maxDistance) { bubbleInfos_[it->first] = sumDistance; }
+ }
+ else // the other cell's bubble is contained in this cell's bubbleInfos
+ {
+ sumDistance = it->second + linkDistance;
+ real_t& entry = bubbleInfos_[it->first];
+
+ // update the distance for this bubble if it is less than the currently known distance
+ if (entry > sumDistance) { entry = sumDistance; }
+ }
+ }
+}
+
+void DistanceInfo::setToZero(bubble_model::BubbleID id)
+{
+ // "bubbleInfos" is of type std::map, if no entry with key "id" exists, a new entry is created
+ bubbleInfos_[id] = real_c(0.0);
+}
+
+void DistanceInfo::removeZeroDistanceFromLiquid()
+{
+ for (auto it = bubbleInfos_.begin(); it != bubbleInfos_.end(); it++)
+ if (it->second <= real_c(0.0)) { bubbleInfos_.erase(it); }
+}
+
+bool DistanceInfo::operator==(DistanceInfo& other) { return (this->bubbleInfos_ == other.bubbleInfos_); }
+
+void DistanceInfo::print(std::ostream& os) const
+{
+ for (auto it = bubbleInfos_.begin(); it != bubbleInfos_.end(); it++)
+ {
+ os << "( " << it->first << "," << it->second << ")\n";
+ }
+}
+
+} // namespace bubble_model
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/bubble_model/DistanceInfo.h b/src/lbm/free_surface/bubble_model/DistanceInfo.h
new file mode 100644
index 0000000000000000000000000000000000000000..72efc7ca9c387c02b4d1f7479f183ef318f64dd4
--- /dev/null
+++ b/src/lbm/free_surface/bubble_model/DistanceInfo.h
@@ -0,0 +1,100 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file DistanceInfo.h
+//! \ingroup bubble_model
+//! \author Daniela Anderl
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Compute the distances between bubbles.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/mpi/BufferDataTypeExtensions.h"
+
+#include "field/GhostLayerField.h"
+
+#include <map>
+
+#include "BubbleDefinitions.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+/***********************************************************************************************************************
+ * Compute the distances from other bubbles in a diffusive manner.
+ *
+ * Each bubble spreads its distance until a defined maximum distance is reached. Cells that are within this
+ * maximum distance from one ore more bubbles know the distance from itself to each of these bubbles (or the single
+ * bubble).
+ *
+ **********************************************************************************************************************/
+class DistanceInfo
+{
+ public:
+ DistanceInfo() = default;
+
+ // get the distance to the bubble that is closest to bubble "ownID" within the range of maxDistance
+ real_t getDistanceToNearestBubble(const BubbleID& ownID, real_t maxDistance) const;
+
+ // combine "bubbleInfos" (std::map) of the current cell with "bubbleInfos" of another cell; the distance between
+ // these two cells is linkDistance:
+ // - if the other cell's bubble is not yet registered, insert it and calculate the distance
+ // - if the other cell's bubble is already registered, update the distance
+ void combine(const DistanceInfo& other, real_t linkDistance, real_t maxDistance);
+
+ // set the distance to bubble "id" to zero; create an entry for this bubble, if non yet exists
+ void setToZero(bubble_model::BubbleID id);
+
+ // remove any entry in "bubbleInfos" with distance <= 0
+ void removeZeroDistanceFromLiquid();
+
+ bool operator==(DistanceInfo& other);
+
+ void clear() { bubbleInfos_.clear(); }
+
+ // print the content of bubbleInfos
+ void print(std::ostream& os) const;
+
+ protected:
+ friend mpi::SendBuffer& operator<<(mpi::SendBuffer&, const DistanceInfo&);
+ friend mpi::RecvBuffer& operator>>(mpi::RecvBuffer&, DistanceInfo&);
+
+ std::map< bubble_model::BubbleID, real_t > bubbleInfos_;
+}; // class DistanceInfo
+
+mpi::SendBuffer& operator<<(mpi::SendBuffer& buf, const DistanceInfo& di);
+mpi::RecvBuffer& operator>>(mpi::RecvBuffer& buf, DistanceInfo& di);
+
+} // namespace bubble_model
+} // namespace free_surface
+} // namespace walberla
+
+namespace walberla
+{
+namespace mpi
+{
+template<>
+struct BufferSizeTrait< free_surface::bubble_model::DistanceInfo >
+{
+ static const bool constantSize = false;
+};
+} // namespace mpi
+} // namespace walberla
diff --git a/src/lbm/free_surface/bubble_model/FloodFill.h b/src/lbm/free_surface/bubble_model/FloodFill.h
new file mode 100644
index 0000000000000000000000000000000000000000..b23d4d774e9376bf104198c64ea6f6394c41f77e
--- /dev/null
+++ b/src/lbm/free_surface/bubble_model/FloodFill.h
@@ -0,0 +1,104 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file FloodFill.h
+//! \ingroup bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Flood fill algorithm to identify connected gas volumes as bubbles.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/cell/Cell.h"
+
+#include <queue>
+
+#include "BubbleDefinitions.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+/***********************************************************************************************************************
+ * Use the flood fill (also called seed fill) algorithm to identify connected gas volumes as bubbles and mark the whole
+ * region belonging to the bubble with a common bubble ID in bubbleField.
+ **********************************************************************************************************************/
+class FloodFillInterface
+{
+ public:
+ virtual ~FloodFillInterface() = default;
+
+ /********************************************************************************************************************
+ * Marks the region of a bubble in the BubbleField
+ *
+ * bubbleField Field where the bubble is marked. BubbleField must not contain entries equal to newBubbleID.
+ * startCell Cell that belongs to bubble. It is used as starting point for flood fill algorithm.
+ * newBubbleID An integer, greater than zero. This value is used as the bubble marker (ID) in the bubble field.
+ * volume Volume of the gas phase, i.e., the sum of (1-fillLevel) for all cells inside the bubble.
+ * nrOfCells The number of cells that belong to this bubble.
+ ********************************************************************************************************************/
+ virtual void run(IBlock& block, BlockDataID bubbleIDField, const Cell& startCell, BubbleID newBubbleID,
+ real_t& volume, uint_t& nrOfCells) = 0;
+}; // class FloodFillInterface
+
+/***********************************************************************************************************************
+ * Use only fill level to identify bubbles.
+ * Problem: isInterfaceFromFillLevel() has to be called to identify interface cells; this is expensive and requires
+ * information from neighboring cells.
+ **********************************************************************************************************************/
+template< typename Stencil_T >
+class FloodFillUsingFillLevel : public FloodFillInterface
+{
+ public:
+ FloodFillUsingFillLevel(ConstBlockDataID fillFieldID) : fillFieldID_(fillFieldID) {}
+ ~FloodFillUsingFillLevel() override = default;
+
+ void run(IBlock& block, BlockDataID bubbleFieldID, const Cell& startCell, BubbleID newBubbleID, real_t& volume,
+ uint_t& nrOfCells) override;
+
+ private:
+ ConstBlockDataID fillFieldID_;
+}; // FloodFillUsingFillLevel
+
+/***********************************************************************************************************************
+ * Use flag field to identify interface cells which should be faster than using only the fill level.
+ **********************************************************************************************************************/
+template< typename FlagField_T >
+class FloodFillUsingFlagField : public FloodFillInterface
+{
+ public:
+ FloodFillUsingFlagField(ConstBlockDataID fillFieldID, ConstBlockDataID flagFieldID)
+ : fillFieldID_(fillFieldID), flagFieldID_(flagFieldID)
+ {}
+
+ ~FloodFillUsingFlagField() override = default;
+
+ void run(IBlock& block, BlockDataID bubbleFieldID, const Cell& startCell, BubbleID newBubbleID, real_t& volume,
+ uint_t& nrOfCells) override;
+
+ private:
+ ConstBlockDataID fillFieldID_;
+ ConstBlockDataID flagFieldID_;
+}; // FloodFillUsingFlagField
+
+} // namespace bubble_model
+} // namespace free_surface
+} // namespace walberla
+
+#include "FloodFill.impl.h"
\ No newline at end of file
diff --git a/src/lbm/free_surface/bubble_model/FloodFill.impl.h b/src/lbm/free_surface/bubble_model/FloodFill.impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..96f1c0361466b96fcf71ac093acee0e14fa57415
--- /dev/null
+++ b/src/lbm/free_surface/bubble_model/FloodFill.impl.h
@@ -0,0 +1,216 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file FloodFill.impl.h
+//! \ingroup bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Flood fill algorithm to identify connected gas volumes as bubbles.
+//
+//======================================================================================================================
+
+#include "lbm/free_surface/FlagInfo.h"
+#include "lbm/free_surface/InterfaceFromFillLevel.h"
+
+#include "FloodFill.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+// Sets newBubbleID in all cells that belong to the same bubble as startCell. Only uses the fillField but needs to
+// call isInterfaceFromFillLevel() to identify interface cells. This is expensive and requires information from
+// neighboring cells.
+template< typename Stencil_T >
+void FloodFillUsingFillLevel< Stencil_T >::run(IBlock& block, BlockDataID bubbleFieldID, const Cell& startCell,
+ BubbleID newBubbleID, real_t& volume, uint_t& nrOfCells)
+{
+ // get fields
+ BubbleField_T* const bubbleField = block.getData< BubbleField_T >(bubbleFieldID);
+ const ScalarField_T* const fillField = block.getData< const ScalarField_T >(fillFieldID_);
+
+ WALBERLA_ASSERT_EQUAL(fillField->xyzSize(), bubbleField->xyzSize());
+
+ volume = real_c(0);
+ nrOfCells = uint_c(0);
+
+ std::queue< Cell > cellQueue;
+ cellQueue.push(startCell);
+
+ std::vector< bool > addedLast;
+
+ using namespace stencil;
+ const int dirs[4] = { N, S, T, B };
+ const uint_t numDirs = uint_c(4);
+
+ CellInterval fieldSizeInterval = fillField->xyzSize();
+
+ while (!cellQueue.empty())
+ {
+ // process first cell in queue
+ Cell cell = cellQueue.front();
+
+ // go to the beginning of the x-line, i.e., find the minimum x-coordinate that still belongs to this bubble
+ while (cell.x() > cell_idx_c(0) &&
+ bubbleField->get(cell.x() - cell_idx_c(1), cell.y(), cell.z()) != newBubbleID &&
+ (fillField->get(cell.x() - cell_idx_c(1), cell.y(), cell.z()) < real_c(1.0) ||
+ isInterfaceFromFillLevel< Stencil_T >(*fillField, cell.x() - cell_idx_c(1), cell.y(), cell.z())))
+ {
+ --cell.x();
+ }
+
+ // vector stores whether a cell in a direction from dirs was added already to make sure that for the whole x-line,
+ // only one neighboring cell per direction is added to the cellQueue
+ addedLast.assign(numDirs, false);
+
+ // loop to the end of the x-line and mark any cell that belongs to this bubble
+ while (cell.x() < cell_idx_c(fillField->xSize()) && bubbleField->get(cell) != newBubbleID &&
+ (fillField->get(cell) < real_c(1) || isInterfaceFromFillLevel< Stencil_T >(*fillField, cell)))
+ {
+ // set bubble ID to this cell
+ bubbleField->get(cell) = newBubbleID;
+ volume += real_c(1.0) - fillField->get(cell);
+ nrOfCells++;
+
+ // iterate over all directions in dirs to check which cells in y- and z-direction should be processed next,
+ // i.e., which cells should be added to cellQueue
+ for (uint_t i = uint_c(0); i < numDirs; ++i)
+ {
+ Cell neighborCell(cell.x(), cell.y() + cy[dirs[i]], cell.z() + cz[dirs[i]]);
+
+ // neighboring cell is not inside the field
+ if (!fieldSizeInterval.contains(neighborCell)) { continue; }
+
+ // neighboring cell is part of the bubble
+ if ((fillField->get(neighborCell) < real_c(1) ||
+ isInterfaceFromFillLevel< Stencil_T >(*fillField, neighborCell)) &&
+ bubbleField->get(neighborCell) != newBubbleID)
+ {
+ // make sure that for the whole x-line, only one neighboring cell per direction is added to the cellQueue
+ if (!addedLast[i])
+ {
+ addedLast[i] = true;
+
+ // add neighboring cell to queue such that it serves as starting cell in one of the next iterations
+ cellQueue.push(neighborCell);
+ }
+ }
+ else { addedLast[i] = false; }
+ }
+
+ ++cell.x();
+ }
+
+ // remove the processed cell from cellQueue
+ cellQueue.pop();
+ }
+}
+
+// Sets newBubbleID in all cells that belong to the same bubble as startCell. Uses the fillField and the flagField
+// and is therefore less expensive than the approach that only uses the fillField.
+template< typename FlagField_T >
+void FloodFillUsingFlagField< FlagField_T >::run(IBlock& block, BlockDataID bubbleFieldID, const Cell& startCell,
+ BubbleID newBubbleID, real_t& volume, uint_t& nrOfCells)
+{
+ // get fields
+ BubbleField_T* const bubbleField = block.getData< BubbleField_T >(bubbleFieldID);
+ const ScalarField_T* const fillField = block.getData< const ScalarField_T >(fillFieldID_);
+ const FlagField_T* const flagField = block.getData< const FlagField_T >(flagFieldID_);
+
+ WALBERLA_ASSERT_EQUAL(fillField->xyzSize(), bubbleField->xyzSize());
+ WALBERLA_ASSERT_EQUAL(fillField->xyzSize(), flagField->xyzSize());
+
+ using flag_t = typename FlagField_T::flag_t;
+ // gasInterfaceFlagMask masks interface and gas cells (using bitwise OR)
+ flag_t gasInterfaceFlagMask = flag_t(0);
+ gasInterfaceFlagMask = flag_t(gasInterfaceFlagMask | flagField->getFlag(flagIDs::interfaceFlagID));
+ gasInterfaceFlagMask = flag_t(gasInterfaceFlagMask | flagField->getFlag(flagIDs::gasFlagID));
+
+ volume = real_c(0);
+ nrOfCells = uint_c(0);
+
+ std::queue< Cell > cellQueue;
+ cellQueue.push(startCell);
+
+ std::vector< bool > addedLast;
+
+ using namespace stencil;
+ const int dirs[4] = { N, S, T, B };
+ const uint_t numDirs = uint_c(4);
+
+ CellInterval fieldSizeInterval = flagField->xyzSize();
+
+ while (!cellQueue.empty())
+ {
+ // process first cell in queue
+ Cell& cell = cellQueue.front();
+
+ // go to the beginning of the x-line, i.e., find the minimum x-coordinate that still belongs to this bubble
+ while (isPartOfMaskSet(flagField->get(cell.x() - cell_idx_c(1), cell.y(), cell.z()), gasInterfaceFlagMask) &&
+ cell.x() > cell_idx_c(0) && bubbleField->get(cell.x() - cell_idx_c(1), cell.y(), cell.z()) != newBubbleID)
+ {
+ --cell.x();
+ }
+
+ // vector stores whether a cell in a direction from dirs was added already to make sure that for the whole x-line,
+ // only one neighboring cell per direction is added to the cellQueue
+ addedLast.assign(numDirs, false);
+
+ // loop to the end of the x-line and mark any cell that belongs to this bubble
+ while (isPartOfMaskSet(flagField->get(cell), gasInterfaceFlagMask) && bubbleField->get(cell) != newBubbleID &&
+ cell.x() < cell_idx_c(flagField->xSize()))
+ {
+ // set bubble ID to this cell
+ bubbleField->get(cell) = newBubbleID;
+ volume += real_c(1.0) - fillField->get(cell);
+ nrOfCells++;
+
+ // iterate over all directions in dirs to check which cells in y- and z-direction should be processed next,
+ // i.e., which cells should be added to cellQueue
+ for (uint_t i = uint_c(0); i < numDirs; ++i)
+ {
+ Cell neighborCell(cell.x(), cell.y() + cy[dirs[i]], cell.z() + cz[dirs[i]]);
+
+ // neighboring cell is not inside the field
+ if (!fieldSizeInterval.contains(neighborCell)) { continue; }
+
+ // neighboring cell is part of the bubble
+ if (!isPartOfMaskSet(flagField->get(neighborCell), gasInterfaceFlagMask) &&
+ bubbleField->get(neighborCell) != newBubbleID)
+ {
+ // make sure that for the whole x-line, only one neighboring cell per direction is added to the cellQueue
+ if (!addedLast[i])
+ {
+ addedLast[i] = true;
+
+ // add neighboring cell to queue such that it serves as starting cell in one of the next iterations
+ cellQueue.push(neighborCell);
+ }
+ }
+ else { addedLast[i] = false; }
+ }
+ ++cell.x();
+ }
+
+ // remove the processed cell from cellQueue
+ cellQueue.pop();
+ }
+}
+
+} // namespace bubble_model
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/bubble_model/Geometry.h b/src/lbm/free_surface/bubble_model/Geometry.h
new file mode 100644
index 0000000000000000000000000000000000000000..7201a632eaea0df4d18a4e1884c02059ecf40796
--- /dev/null
+++ b/src/lbm/free_surface/bubble_model/Geometry.h
@@ -0,0 +1,87 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file Geometry.h
+//! \ingroup bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Geometrical helper functions for the bubble model.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/math/AABB.h"
+#include "core/math/Vector3.h"
+
+#include "domain_decomposition/StructuredBlockStorage.h"
+
+#include "field/FlagField.h"
+
+#include "geometry/bodies/BodyOverlapFunctions.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+/***********************************************************************************************************************
+ * Set fill levels in a scalar ghost layer field (GhostLayerField<real_t,1>) using a geometric body object. Specifying
+ * isGas determines whether the body is initialized as gas bubble or liquid drop.
+ *
+ * The function overlapVolume(body, cellmidpoint, dx) has to be defined for the body object.
+ *
+ * The volume fraction of the body is _SUBTRACTED_ from the each cells' current fill level, including ghost layer cells.
+ * Therefore, the field should be initialized with 1 in each cell ( "everywhere fluid").
+ * Then:
+ * - if a cell is inside a body, its fill level is 0
+ * - if a cell is completely outside the body, its fill level is not changed and remains 1
+ * - if a cell is partially inside the sphere, the amount of overlap is subtracted from the current fill level; it can
+ * not become negative and is limited to 0
+ **********************************************************************************************************************/
+template< typename Body_T >
+void addBodyToFillLevelField(StructuredBlockStorage& blockStorage, BlockDataID fillFieldID, const Body_T& body,
+ bool isGas);
+
+/***********************************************************************************************************************
+ * Set flag field according to given fill level field.
+ *
+ * FillLevel <=0 : gas flag (and both other flags are removed if set)
+ * FillLevel >=1 : fluid flag (and both other flags are removed if set)
+ * otherwise : interface flag (and both other flags are removed if set)
+ *
+ * The three FlagUIDs for liquid, gas and interface must already be registered at the flag field.
+ **********************************************************************************************************************/
+template< typename flag_t >
+void setFlagFieldFromFillLevels(FlagField< flag_t >* flagField, const GhostLayerField< real_t, 1 >* fillField,
+ const FlagUID& liquid, const FlagUID& gas, const FlagUID& interFace);
+
+/***********************************************************************************************************************
+ * Check if interface layer is valid and correctly separates gas and fluid cells:
+ * - gas cell must not have a fluid cell in its (Stencil_T) neighborhood
+ * - fluid cell must not have a gas cell in its (Stencil_T) neighborhood
+ *
+ * The three FlagUIDs for liquid, gas and interface must already be registered at the flag field.
+ **********************************************************************************************************************/
+template< typename flag_t, typename Stencil_T >
+bool checkForValidInterfaceLayer(const FlagField< flag_t >* flagField, const FlagUID& liquid, const FlagUID& gas,
+ const FlagUID& interFace, bool printWarnings);
+
+} // namespace bubble_model
+} // namespace free_surface
+} // namespace walberla
+
+#include "Geometry.impl.h"
\ No newline at end of file
diff --git a/src/lbm/free_surface/bubble_model/Geometry.impl.h b/src/lbm/free_surface/bubble_model/Geometry.impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..9b0fd0dbaa1fef4ea6d969181d53e68f73f36d61
--- /dev/null
+++ b/src/lbm/free_surface/bubble_model/Geometry.impl.h
@@ -0,0 +1,219 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file Geometry.impl.h
+//! \ingroup bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Geometrical helper functions for the bubble model.
+//
+//======================================================================================================================
+
+#include "core/logging/Logging.h"
+
+#include "field/FlagField.h"
+#include "field/GhostLayerField.h"
+
+#include <limits>
+
+#include "Geometry.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+template< typename Body_T >
+void addBodyToFillLevelField(StructuredBlockStorage& blockStorage, BlockDataID fillFieldID, const Body_T& body,
+ bool isGas)
+{
+ const real_t dx = blockStorage.dx();
+
+ for (auto blockIt = blockStorage.begin(); blockIt != blockStorage.end(); ++blockIt)
+ {
+ // get block
+ IBlock* block = &(*blockIt);
+
+ // get fill level field
+ GhostLayerField< real_t, 1 >* const fillField = block->getData< GhostLayerField< real_t, 1 > >(fillFieldID);
+
+ // get the block's bounding box
+ AABB blockBB = block->getAABB();
+
+ // extend the bounding box with the ghost layer
+ blockBB.extend(dx * real_c(fillField->nrOfGhostLayers()));
+
+ // skip blocks that do not intersect the body
+ if (geometry::fastOverlapCheck(body, blockBB) == geometry::COMPLETELY_OUTSIDE) { continue; }
+
+ // get the global coordinates (via the bounding box) of the block's first cell
+ AABB firstCellBB;
+ blockStorage.getBlockLocalCellAABB(*block, fillField->beginWithGhostLayer().cell(), firstCellBB);
+
+ // get the global coordinates of the midpoint of the block's first cell
+ Vector3< real_t > firstCellMidpoint;
+ for (uint_t i = uint_c(0); i < uint_c(3); ++i)
+ {
+ firstCellMidpoint[i] = firstCellBB.min(i) + real_c(0.5) * firstCellBB.size(i);
+ }
+
+ // get the number of ghost layers
+ const uint_t numGl = fillField->nrOfGhostLayers();
+ cell_idx_t glCellIndex = cell_idx_c(numGl);
+
+ // starting from a block's first cell, iterate over all cells and determine the overlap of the body with each cell
+ // to set the cell's fill level accordingly
+ Vector3< real_t > currentMidpoint;
+ currentMidpoint[2] = firstCellMidpoint[2];
+ for (cell_idx_t z = -glCellIndex; z < cell_idx_c(fillField->zSize() + numGl); ++z, currentMidpoint[2] += dx)
+ {
+ currentMidpoint[1] = firstCellMidpoint[1];
+ for (cell_idx_t y = -glCellIndex; y < cell_idx_c(fillField->ySize() + numGl); ++y, currentMidpoint[1] += dx)
+ {
+ currentMidpoint[0] = firstCellMidpoint[0];
+ for (cell_idx_t x = -glCellIndex; x < cell_idx_c(fillField->xSize() + numGl); ++x, currentMidpoint[0] += dx)
+ {
+ // get the current cell's overlap with the body (full overlap=1, no overlap=0, else in between)
+ real_t overlapFraction = geometry::overlapFraction(body, currentMidpoint, dx);
+
+ // get the current fill level
+ real_t& fillLevel = fillField->get(x, y, z);
+ WALBERLA_ASSERT(fillLevel >= 0 && fillLevel <= 1);
+
+ // initialize a gas bubble (fill level=0)
+ if (isGas)
+ {
+ // subtract the fraction of the body's overlap from the fill level
+ fillLevel -= overlapFraction;
+
+ // limit the fill level such that it does not become negative during initialization
+ fillLevel = std::max(fillLevel, real_c(0.0));
+ }
+ else // initialize a liquid drop (fill level=1)
+ {
+ // add the fraction of the body's overlap from the fill level
+ fillLevel += overlapFraction;
+
+ // limit the fill level such that it does not become too large during initialization
+ fillLevel = std::min(fillLevel, real_c(1.0));
+ }
+ }
+ }
+ }
+ }
+}
+
+template< typename flag_t >
+void setFlagFieldFromFillLevels(FlagField< flag_t >* flagField, const GhostLayerField< real_t, 1 >* fillField,
+ const FlagUID& liquid, const FlagUID& gas, const FlagUID& interFace)
+{
+ WALBERLA_ASSERT(flagField->xyzSize() == fillField->xyzSize());
+
+ // get flags from flag field
+ flag_t liquidFlag = flagField->getFlag(liquid);
+ flag_t gasFlag = flagField->getFlag(gas);
+ flag_t interfaceFlag = flagField->getFlag(interFace);
+
+ flag_t allMask = liquidFlag | gasFlag | interfaceFlag;
+
+ using FillField_T = GhostLayerField< real_t, 1 >;
+
+ // iterate over all cells (including ghost layer) in fill level field and flag field
+ WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ(fillField, {
+ const typename FillField_T::ConstPtr fillFieldPtr(*fillField, x, y, z);
+ const typename FlagField< flag_t >::Ptr flagFieldPtr(*flagField, x, y, z);
+
+ // clear liquid, gas, and interface flags in flag field
+ removeMask(flagFieldPtr, allMask);
+
+ if (*fillFieldPtr <= real_c(0)) { addFlag(flagFieldPtr, gasFlag); }
+ else
+ {
+ if (*fillFieldPtr >= real_c(1)) { addFlag(flagFieldPtr, liquidFlag); }
+ else
+ {
+ // add interface flag for fill levels between 0 and 1
+ addFlag(flagFieldPtr, interfaceFlag);
+ }
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ
+}
+
+template< typename flag_t, typename Stencil_T >
+bool checkForValidInterfaceLayer(const FlagField< flag_t >* flagField, const FlagUID& liquid, const FlagUID& gas,
+ const FlagUID& interFace, bool printWarnings)
+{
+ // variable only used when printWarnings is true; avoids premature termination of the search such that any non-valid
+ // cell can be print
+ bool valid = true;
+
+ // get flags
+ flag_t liquidFlag = flagField->getFlag(liquid);
+ flag_t gasFlag = flagField->getFlag(gas);
+ flag_t interfaceFlag = flagField->getFlag(interFace);
+
+ // iterate flag field
+ for (auto flagFieldIt = flagField->begin(); flagFieldIt != flagField->end(); ++flagFieldIt)
+ {
+ // check that not more than one flag is set for a cell
+ if (isMaskSet(flagFieldIt, flag_t(liquidFlag | gasFlag)) ||
+ isMaskSet(flagFieldIt, flag_t(liquidFlag | interfaceFlag)) ||
+ isMaskSet(flagFieldIt, flag_t(gasFlag | interfaceFlag)))
+ {
+ if (!printWarnings) { return false; }
+ valid = false;
+ WALBERLA_LOG_WARNING("More than one free surface flag is set in cell " << flagFieldIt.cell() << ".");
+ }
+
+ // if current cell is a gas cell it must not have a fluid cell in its neighborhood
+ if (isFlagSet(flagFieldIt, liquidFlag))
+ {
+ for (auto dir = Stencil_T::beginNoCenter(); dir != Stencil_T::end(); ++dir)
+ {
+ if (isFlagSet(flagFieldIt.neighbor(*dir), gasFlag))
+ {
+ if (!printWarnings) { return false; }
+ valid = false;
+ WALBERLA_LOG_WARNING("Fluid cell " << flagFieldIt.cell()
+ << " has a gas cell in its direct neighborhood.");
+ }
+ }
+ }
+ // if current cell is a fluid cell it must not have a gas cell in its neighborhood
+ else
+ {
+ if (isFlagSet(flagFieldIt, gasFlag))
+ {
+ for (auto dir = Stencil_T::beginNoCenter(); dir != Stencil_T::end(); ++dir)
+ {
+ if (isFlagSet(flagFieldIt.neighbor(*dir), liquidFlag))
+ {
+ if (!printWarnings) { return false; }
+ valid = false;
+ WALBERLA_LOG_WARNING("Gas cell " << flagFieldIt.cell()
+ << " has a fluid cell in its direct neighborhood.");
+ }
+ }
+ }
+ }
+ }
+
+ return valid;
+}
+
+} // namespace bubble_model
+} // namespace free_surface
+} // namespace walberla
\ No newline at end of file
diff --git a/src/lbm/free_surface/bubble_model/MergeInformation.cpp b/src/lbm/free_surface/bubble_model/MergeInformation.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..15d6f6bd8ba75e3fa9473551907b87cd20a79c8f
--- /dev/null
+++ b/src/lbm/free_surface/bubble_model/MergeInformation.cpp
@@ -0,0 +1,337 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file MergeInformation.cpp
+//! \ingroup bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Manage merging of bubbles.
+//
+//======================================================================================================================
+
+#include "MergeInformation.h"
+
+#include "core/mpi/MPIManager.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+MergeInformation::MergeInformation(uint_t numberOfBubbles)
+{
+ hasMerges_ = false;
+ resize(numberOfBubbles);
+}
+
+/***********************************************************************************************************************
+ * Implementation Note (see also MergeInformationTest.cpp):
+ * ---------------------
+ * renameVec_ = { 0, 1, 2, 3, 4, 5 }
+ *
+ * position 5 is renamed to the ID at position 3:
+ * (1) registerMerge( 5, 3 );
+ * renameVec_ = { 0, 1, 2, 3, 4, 3 }
+ *
+ * position 3 is renamed to the ID at position 1:
+ * (2) registerMerge(3, 1);
+ * renameVec_ = { 0, 1, 2, 1, 4, 3 }
+ *
+ * since position 3 was already renamed to the ID at position 1, registerMerge(1, 0) is called internally and
+ * position 1 is renamed to the ID at position 0; position 3 is renamed to the ID at position 0
+ * (3) registerMerge( 3, 0 );
+ * -> leads to recursive registerMerge(1, 0);
+ * renameVec_ = { 0, 0, 2, 0, 4, 3 }
+ * since position 5 was already renamed to the ID of position 3, registerMerge(3, 2) is called internally; since
+ * position 3 was already renamed to the ID of position 0, registerMerge(2, 0) is called internally; position 2 is
+ * renamed to the ID at position 0, position 5 is renamed to the ID at position 0
+ * (4) registerMerge( 5, 2)
+ * -> leads to recursive registerMerge( 3, 2)
+ * registerMerge( 0, 2)
+ * renameVec_ = { 0, 0, 0, 0, 4, 0 }
+ *
+ * Recursive call in Step(3) is necessary because otherwise the mapping from 3->1 would be "forgotten".
+ * However, not all transitive renames are resolved by this function as seen in step (3): 5->3->1
+ * Thus, the additional function resolveTransitiveRenames() is required.
+ **********************************************************************************************************************/
+void MergeInformation::registerMerge(BubbleID b0, BubbleID b1)
+{
+ WALBERLA_ASSERT_LESS(b0, renameVec_.size());
+ WALBERLA_ASSERT_LESS(b1, renameVec_.size());
+
+ // identical bubbles can not be merged
+ if (b0 == b1) { return; }
+
+ // register the merge using hasMerges_
+ hasMerges_ = true;
+
+ // ensure that b0 < b1 (increasing ID ordering is required for some functions later on)
+ if (b1 < b0) { std::swap(b0, b1); }
+
+ WALBERLA_ASSERT_LESS(b0, b1);
+
+ // if bubble b1 is also marked for merging with another bubble, e.g., bubble b2
+ if (isRenamed(b1))
+ {
+ // mark bubble b2 for merging with b0 (b2 = renameVec_[b1])
+ registerMerge(b0, renameVec_[b1]);
+
+ // mark bubble b1 for merging with bubble b0 or bubble b2 (depending on the ID order found in
+ // registerMerge(b0,b2) above)
+ renameVec_[b1] = renameVec_[renameVec_[b1]];
+ }
+ else
+ {
+ // mark bubble b1 for merging with bubble b0
+ renameVec_[b1] = b0;
+ }
+}
+
+void MergeInformation::mergeAndReorderBubbleVector(std::vector< Bubble >& bubbles)
+{
+ // no bubble merge possible with less than 2 bubbles
+ if (bubbles.size() < uint_c(2)) { return; }
+
+ // rename merged bubbles (always keep smallest bubble ID)
+ resolveTransitiveRenames();
+
+#ifndef NDEBUG
+ uint_t numberOfMerges = countNumberOfRenames();
+#endif
+
+ WALBERLA_ASSERT_EQUAL(bubbles.size(), renameVec_.size());
+ WALBERLA_ASSERT_EQUAL(renameVec_[0], 0);
+
+ for (size_t i = uint_c(0); i < bubbles.size(); ++i)
+ {
+ // any entry that does not point to itself needs to be merged
+ if (renameVec_[i] != i)
+ {
+ WALBERLA_ASSERT_LESS(renameVec_[i], i);
+
+ // merge bubbles
+ bubbles[renameVec_[i]].merge(bubbles[i]);
+ }
+ }
+
+ // create temporary vector with "index = bubble ID" to store the exchanged bubble IDs
+ std::vector< BubbleID > exchangeVector(bubbles.size());
+ for (size_t i = uint_c(0); i < exchangeVector.size(); ++i)
+ {
+ exchangeVector[i] = BubbleID(i);
+ }
+
+ // gapPointer searches for the renamed bubbles in increasing order; vector entries found by gapPointer are "gaps" and
+ // can be overwritten
+ uint_t gapPointer = uint_c(1);
+ while (gapPointer < bubbles.size() && !isRenamed(gapPointer)) // find first renamed bubble
+ {
+ ++gapPointer;
+ }
+
+ // lastPointer searches for not-renamed bubbles in decreasing order; vector entries found by lastPointer remain in
+ // the vector and will be copied to the gaps
+ uint_t lastPointer = uint_c(renameVec_.size() - 1);
+ while (isRenamed(lastPointer) && lastPointer > uint_c(0)) // find last non-renamed bubble
+ {
+ --lastPointer;
+ }
+
+ while (lastPointer > gapPointer)
+ {
+ // exchange the last valid (non-renamed) bubble ID with the first non-valid (renamed) bubble ID; anything
+ // gapPointer points to will be deleted later; this reorders the bubble vector
+ std::swap(bubbles[gapPointer], bubbles[lastPointer]);
+
+ // store the above exchange
+ exchangeVector[lastPointer] = BubbleID(gapPointer);
+ exchangeVector[gapPointer] = BubbleID(lastPointer);
+
+ // update lastPointer, i.e., find next non-renamed bubble
+ do
+ {
+ --lastPointer;
+ // important condition: "lastPointer > gapPointer" since gapPointer is valid now
+ } while (isRenamed(lastPointer) && lastPointer > gapPointer);
+
+ // update gapPointer, i.e., find next renamed bubble
+ do
+ {
+ ++gapPointer;
+ } while (gapPointer < bubbles.size() && !isRenamed(gapPointer));
+ }
+
+ // shrink bubble vector (any element after lastPointer is not valid and can be removed)
+ uint_t newSize = lastPointer + uint_c(1);
+ WALBERLA_ASSERT_EQUAL(newSize, bubbles.size() - numberOfMerges);
+ WALBERLA_ASSERT_LESS_EQUAL(newSize, bubbles.size());
+ bubbles.resize(newSize);
+
+ // update renameVec_ with exchanged bubble IDs with the highest unnecessary bubble IDs being dropped; this ensures
+ // that bubble IDs are always numbered continuously from 0 upwards
+ for (size_t i = 0; i < renameVec_.size(); ++i)
+ {
+ renameVec_[i] = exchangeVector[renameVec_[i]];
+ WALBERLA_ASSERT_LESS(renameVec_[i], newSize);
+ }
+}
+
+void MergeInformation::communicateMerges()
+{
+ // merges can only be communicated if they occurred and are registered in renameVec_
+ if (renameVec_.empty()) { return; }
+
+ // rename process local bubble IDs
+ resolveTransitiveRenames();
+
+ // globally combine all rename vectors
+ int numProcesses = MPIManager::instance()->numProcesses();
+ std::vector< BubbleID > allRenameVectors(renameVec_.size() * uint_c(numProcesses));
+ WALBERLA_MPI_SECTION()
+ {
+ MPI_Allgather(&renameVec_[0], int_c(renameVec_.size()), MPITrait< BubbleID >::type(), &allRenameVectors[0],
+ int_c(renameVec_.size()), MPITrait< BubbleID >::type(), MPI_COMM_WORLD);
+ }
+
+ // check for inter-process bubble merges
+ for (size_t i = renameVec_.size() - 1; i > 0; --i)
+ for (int process = 0; process < numProcesses; ++process)
+ {
+ if (process == MPIManager::instance()->rank()) { continue; } // local merges have already been treated
+
+ size_t idx = uint_c(process) * renameVec_.size() + i;
+
+ // register inter-process bubble merge (this updated renameVec_)
+ if (allRenameVectors[idx] != i) { registerMerge(allRenameVectors[idx], BubbleID(i)); }
+ }
+
+ // rename global bubble IDs
+ resolveTransitiveRenames();
+}
+
+void MergeInformation::renameOnBubbleField(BubbleField_T* bubbleField) const
+{
+ WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ(bubbleField, {
+ const typename BubbleField_T::Ptr bubblePtr(*bubbleField, x, y, z);
+ if (*bubblePtr != INVALID_BUBBLE_ID) { *bubblePtr = renameVec_[*bubblePtr]; }
+ }) // WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ
+}
+
+void MergeInformation::resizeAndClear(uint_t numberOfBubbles)
+{
+ renameVec_.resize(numberOfBubbles);
+ for (uint_t i = uint_c(0); i < numberOfBubbles; ++i)
+ {
+ renameVec_[i] = BubbleID(i);
+ }
+
+ hasMerges_ = false;
+}
+
+void MergeInformation::resize(uint_t numberOfBubbles)
+{
+ if (numberOfBubbles > renameVec_.size())
+ {
+ renameVec_.reserve(numberOfBubbles);
+ for (size_t i = renameVec_.size(); i < numberOfBubbles; ++i)
+ {
+ renameVec_.push_back(BubbleID(i));
+ }
+ }
+}
+
+void MergeInformation::resolveTransitiveRenames()
+{
+ WALBERLA_ASSERT_GREATER(renameVec_.size(), 0);
+ WALBERLA_ASSERT_EQUAL(renameVec_[0], 0);
+
+ for (size_t i = renameVec_.size() - 1; i > 0; --i)
+ {
+ // create new bubble ID for each entry in renameVec_
+ BubbleID& newBubbleID = renameVec_[i];
+
+ // example 1: "renameVec_[4] = 2" means that bubble 4 has merged with bubble 2
+ // => bubble 4 is renamed to bubble 2 (always the smaller ID is kept)
+ // example 2: "renameVec_[4] = 2" and "renameVec_[2] = 1" means above and that bubble 2 has merged with bubble 1
+ // => bubble 4 should finally be renamed to bubble 1
+
+ // this loop ensures that renaming is correct even if multiple bubbles have merged (as in example 2 from above)
+ while (renameVec_[newBubbleID] != newBubbleID)
+ {
+ newBubbleID = renameVec_[newBubbleID];
+ }
+ }
+
+ WALBERLA_ASSERT(transitiveRenamesResolved()); // ensure that renaming was resolved correctly
+}
+
+bool MergeInformation::transitiveRenamesResolved() const
+{
+ for (size_t i = 0; i < renameVec_.size(); ++i)
+ {
+ // A = renameVec_[i]
+ // B = renameVec_[A]
+ // A must be equal to B after bubble renaming
+ if (renameVec_[i] != renameVec_[renameVec_[i]]) { return false; }
+ }
+
+ // ensure that no entry points to an element that has been renamed
+ for (size_t i = 0; i < renameVec_.size(); ++i)
+ {
+ if (renameVec_[i] != i) // bubble at entry i has been renamed
+ {
+ for (size_t j = 0; j < renameVec_.size(); ++j)
+ {
+ // renameVec_[j] points to entry i although i has been renamed
+ if (i != j && renameVec_[j] == i) { return false; }
+ }
+ }
+ }
+
+ return true;
+}
+
+uint_t MergeInformation::countNumberOfRenames() const
+{
+ uint_t renames = uint_c(0);
+ for (size_t i = 0; i < renameVec_.size(); ++i)
+ {
+ // only bubbles with "bubble ID != index" have been renamed
+ if (renameVec_[i] != i) { ++renames; }
+ }
+
+ return renames;
+}
+
+void MergeInformation::print(std::ostream& os) const
+{
+ os << "Merge Information: ";
+
+ for (size_t i = 0; i < renameVec_.size(); ++i)
+ os << "( " << i << " -> " << renameVec_[i] << " ), ";
+
+ os << std::endl;
+}
+
+std::ostream& operator<<(std::ostream& os, const MergeInformation& mi)
+{
+ mi.print(os);
+ return os;
+}
+
+} // namespace bubble_model
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/bubble_model/MergeInformation.h b/src/lbm/free_surface/bubble_model/MergeInformation.h
new file mode 100644
index 0000000000000000000000000000000000000000..d8ce84faaa5fdf2d34b09ef353536cf164b4ce3d
--- /dev/null
+++ b/src/lbm/free_surface/bubble_model/MergeInformation.h
@@ -0,0 +1,102 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file MergeInformation.h
+//! \ingroup bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Manage merging of bubbles.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include <iostream>
+
+#include "Bubble.h"
+#include "BubbleDefinitions.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+/***********************************************************************************************************************
+ * Class for managing bubble merging.
+ *
+ * - assumption: each process holds a synchronized, global vector of bubbles
+ * - each process creates a new MergeInformation class, which internally holds a mapping from BubbleID -> BubbleID
+ * - then during the time step, several merges can be registered using registerMerge() member function
+ * - this information is then communicated between all processes using communicateMerges()
+ * - Then the merges are executed on each process locally. This means that bubble volumes have to be added,
+ * and bubbles have to be deleted. To still have a continuous array, the last elements are copied to the place where
+ * the deleted bubbles have been -> renaming of bubbles.
+ * - the renaming has to be done also in the bubble field using renameOnBubbleField()
+ **********************************************************************************************************************/
+class MergeInformation
+{
+ public:
+ MergeInformation(uint_t numberOfBubbles = uint_c(0));
+
+ void registerMerge(BubbleID b0, BubbleID b1);
+
+ // globally communicate bubble merges and rename bubble IDs accordingly in renameVec_
+ void communicateMerges();
+
+ // merge bubbles according to renameVec_, and reorder and shrink the bubble vector such that bubble IDs are always
+ // numbered continuously from 0 upwards
+ void mergeAndReorderBubbleVector(std::vector< Bubble >& bubbles);
+
+ // rename all bubbles in the bubble field according to renameVec_
+ void renameOnBubbleField(BubbleField_T* bf) const;
+
+ void resizeAndClear(uint_t numberOfBubbles);
+
+ bool hasMerges() const { return hasMerges_; }
+
+ void print(std::ostream& os) const;
+
+ // vector for tracking bubble renaming:
+ // - "renameVec_[4] = 2": bubble 4 has merged with bubble 2, i.e., any 4 can be replaced by 2 in the bubble field
+ // - "renameVec_[i] <= i" for all i: when two bubbles merge, the smaller bubble ID is chosen for the resulting bubble
+ std::vector< BubbleID > renameVec_;
+
+ private:
+ // adapt size of permutation vector, and init new elements with "identity"
+ void resize(uint_t numberOfBubbles);
+
+ inline bool isRenamed(size_t i) const { return renameVec_[i] != i; }
+
+ // ensure that renaming of bubble IDs is correct even if multiple bubbles merge during the same time step
+ void resolveTransitiveRenames();
+
+ // check whether renaming has been done correctly, i.e., check the correctness of renameVec_
+ bool transitiveRenamesResolved() const;
+
+ uint_t countNumberOfRenames() const;
+
+ // signals that merges have to be treated in this time step, true whenever renameVec_ is not the identity mapping
+ bool hasMerges_;
+
+ // friend function used in unit tests (MergeInformationTest)
+ friend void checkRenameVec(const MergeInformation& mi, const std::vector< BubbleID >& vecCompare);
+}; // MergeInformation
+
+std::ostream& operator<<(std::ostream& os, const MergeInformation& mi);
+
+} // namespace bubble_model
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/bubble_model/NewBubbleCommunication.cpp b/src/lbm/free_surface/bubble_model/NewBubbleCommunication.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..f36c504a494c6abb8324aa999754339d82050e73
--- /dev/null
+++ b/src/lbm/free_surface/bubble_model/NewBubbleCommunication.cpp
@@ -0,0 +1,232 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file NewBubbleCommunication.cpp
+//! \ingroup bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Communication for the creation of new bubbles.
+//
+//======================================================================================================================
+
+#include "NewBubbleCommunication.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+class CommunicatedNewBubbles
+{
+ public:
+ CommunicatedNewBubbles(size_t nrOfBubblesBefore, size_t locallyCreatedBubbles, size_t localOffset)
+ : nextBubbleCtr_(0)
+ {
+ temporalIDToNewIDMap_.resize(locallyCreatedBubbles);
+ nrOfBubblesBefore_ = numeric_cast< BubbleID >(nrOfBubblesBefore);
+ nrOfLocallyCreatedBubbles_ = numeric_cast< BubbleID >(locallyCreatedBubbles);
+ localOffset_ = numeric_cast< BubbleID >(localOffset);
+ }
+
+ void storeNextBubble(BubbleID newBubbleID, Bubble& bubbleToStoreTo)
+ {
+ // store newBubbleID in map
+ if (wasNextBubbleCreatedOnThisProcess()) { temporalIDToNewIDMap_[nextBubbleCtr_ - localOffset_] = newBubbleID; }
+
+ // store bubble
+ recvBuffer_ >> bubbleToStoreTo;
+
+ ++nextBubbleCtr_;
+ }
+
+ // return whether there are new bubbles that have to be processed
+ bool hasMoreBubbles() const { return !recvBuffer_.isEmpty(); }
+
+ // map the preliminary bubble IDs to global new bubble IDs
+ void mapTemporalToNewBubbleID(BubbleID& id) const
+ {
+ if (id >= nrOfBubblesBefore_) { id = temporalIDToNewIDMap_[id - nrOfBubblesBefore_]; }
+ // else: bubble ID is already mapped correctly
+ }
+
+ mpi::RecvBuffer& recvBuffer() { return recvBuffer_; }
+
+ private:
+ // return whether the next bubble was created on this process
+ bool wasNextBubbleCreatedOnThisProcess() const
+ {
+ // return whether counter of current bubble is between offset and offset+numberOfLocallyCreatedBubbles
+ return nextBubbleCtr_ >= localOffset_ && nextBubbleCtr_ < localOffset_ + nrOfLocallyCreatedBubbles_;
+ }
+
+ mpi::RecvBuffer recvBuffer_;
+
+ BubbleID nrOfBubblesBefore_; // size of global bubble array without new/deleted bubbles
+ BubbleID nrOfLocallyCreatedBubbles_; // number of bubbles that were added on this process
+ BubbleID localOffset_; // the offset of the locally created bubbles in recvBuffer
+ BubbleID nextBubbleCtr_; // number of bubbles that have already been stored with storeNextBubble()
+
+ std::vector< BubbleID > temporalIDToNewIDMap_; // maps the temporal bubble IDs to new global bubble IDs
+}; // class CommunicatedNewBubbles
+
+std::shared_ptr< CommunicatedNewBubbles > NewBubbleCommunication::communicate(size_t nrOfBubblesBefore)
+{
+ std::shared_ptr< MPIManager > mpiManager = MPIManager::instance();
+
+ // cast number of every process' new bubbles to int (int is used in MPI_Allgather)
+ int localNewBubbles = int_c(bubblesToCreate_.size());
+
+ std::vector< int > numNewBubblesPerProcess(uint_t(mpiManager->numProcesses()), 0);
+
+ // communicate, i.e., gather each process' number of new bubbles
+ WALBERLA_MPI_SECTION()
+ {
+ MPI_Allgather(&localNewBubbles, 1, MPITrait< int >::type(), &numNewBubblesPerProcess[0], 1,
+ MPITrait< int >::type(), MPI_COMM_WORLD);
+ }
+ WALBERLA_NON_MPI_SECTION() { numNewBubblesPerProcess[0] = localNewBubbles; }
+
+ // offsetVector[i] is the number of new bubbles created on processes with rank smaller than i
+ std::vector< int > offsetVector;
+ offsetVector.push_back(0);
+ for (size_t i = 0; i < numNewBubblesPerProcess.size() - 1; ++i)
+ {
+ offsetVector.push_back(offsetVector.back() + numNewBubblesPerProcess[i]);
+ }
+
+ WALBERLA_ASSERT_EQUAL(offsetVector.size(), numNewBubblesPerProcess.size());
+
+ // get each process' individual offset
+ size_t offset = uint_c(offsetVector[uint_c(mpiManager->worldRank())]);
+
+ // get the total number of new bubbles
+ size_t numNewBubbles = uint_c(offsetVector.back() + numNewBubblesPerProcess.back());
+
+ mpi::SendBuffer sendBuffer;
+
+ size_t bytesPerBubble = mpi::BufferSizeTrait< Bubble >::size;
+
+ // reserve space for a bubble's size in bytes (clean way to create send buffer)
+ sendBuffer.reserve(bytesPerBubble);
+
+ // pack local new bubble data into sendBuffer
+ for (auto i = bubblesToCreate_.begin(); i != bubblesToCreate_.end(); ++i)
+ {
+ sendBuffer << *i;
+ }
+
+ // compute the byte size of numNewBubblesPerProcess[i] and offsetVector[i]
+ for (uint_t i = uint_c(0); i < uint_c(mpiManager->numProcesses()); ++i)
+ {
+ numNewBubblesPerProcess[i] *= int_c(bytesPerBubble);
+ offsetVector[i] *= int_c(bytesPerBubble);
+ }
+
+ // create new CommunicatedNewBubbles object to store the gathered new bubbles (see below)
+ auto result = std::make_shared< CommunicatedNewBubbles >(nrOfBubblesBefore, bubblesToCreate_.size(), offset);
+
+ // resize recvBuffer for storing the total number of new bubbles
+ result->recvBuffer().resize(bytesPerBubble * numNewBubbles);
+
+ WALBERLA_MPI_SECTION()
+ {
+ // communicate, i.e., gather all locally added bubbles (and store them in the new CommunicatedNewBubbles object)
+ MPI_Allgatherv(sendBuffer.ptr(), int_c(sendBuffer.size()), MPI_UNSIGNED_CHAR, result->recvBuffer().ptr(),
+ &numNewBubblesPerProcess[0], &offsetVector[0], MPI_UNSIGNED_CHAR, MPI_COMM_WORLD);
+ }
+ WALBERLA_NON_MPI_SECTION() { result->recvBuffer() = sendBuffer; }
+
+ // all bubbles have been "created" and vector can be cleared
+ bubblesToCreate_.clear();
+
+ return result;
+}
+
+void NewBubbleCommunication::communicateAndApply(std::vector< Bubble >& vectorToAddBubbles,
+ StructuredBlockStorage& blockStorage, BlockDataID bubbleFieldID)
+{
+ // communicate
+ std::shared_ptr< CommunicatedNewBubbles > newBubbleContainer = communicate(vectorToAddBubbles.size());
+
+ // append new bubbles to vectorToAddBubbles
+ BubbleID nextBubbleID = numeric_cast< BubbleID >(vectorToAddBubbles.size());
+ while (newBubbleContainer->hasMoreBubbles())
+ {
+ // create and append a new empty bubble
+ vectorToAddBubbles.emplace_back();
+
+ // update the empty bubble with the received bubble
+ newBubbleContainer->storeNextBubble(nextBubbleID, vectorToAddBubbles.back());
+
+ ++nextBubbleID;
+ }
+
+ // rename bubble IDs
+ for (auto blockIt = blockStorage.begin(); blockIt != blockStorage.end(); ++blockIt)
+ {
+ BubbleField_T* const bubbleField = blockIt->getData< BubbleField_T >(bubbleFieldID);
+ for (auto fieldIt = bubbleField->begin(); fieldIt != bubbleField->end(); ++fieldIt)
+ {
+ // rename an existing bubble ID in bubbleField
+ if (*fieldIt != INVALID_BUBBLE_ID) { newBubbleContainer->mapTemporalToNewBubbleID(*fieldIt); }
+ }
+ }
+}
+
+void NewBubbleCommunication::communicateAndApply(std::vector< Bubble >& vectorToAddBubbles,
+ const std::vector< bool >& bubblesToOverwrite,
+ StructuredBlockStorage& blockStorage, BlockDataID bubbleFieldID)
+{
+ WALBERLA_ASSERT_EQUAL(bubblesToOverwrite.size(), vectorToAddBubbles.size());
+
+ // communicate
+ std::shared_ptr< CommunicatedNewBubbles > newBubbleContainer = communicate(vectorToAddBubbles.size());
+
+ // overwrite existing bubbles with new bubbles; there must be at least the same number of new bubbles than in
+ // bubblesToOverwrite
+ for (size_t i = 0; i < bubblesToOverwrite.size(); ++i)
+ {
+ if (bubblesToOverwrite[i]) { newBubbleContainer->storeNextBubble(BubbleID(i), vectorToAddBubbles[i]); }
+ }
+
+ // append remaining new bubbles to vectorToAddBubbles
+ BubbleID nextBubbleID = numeric_cast< BubbleID >(vectorToAddBubbles.size());
+ while (newBubbleContainer->hasMoreBubbles())
+ {
+ // create and append a new empty bubble
+ vectorToAddBubbles.emplace_back();
+
+ // update the empty bubble with the received bubble
+ newBubbleContainer->storeNextBubble(nextBubbleID, vectorToAddBubbles.back());
+
+ ++nextBubbleID;
+ }
+
+ // rename bubble IDs
+ for (auto blockIt = blockStorage.begin(); blockIt != blockStorage.end(); ++blockIt)
+ {
+ BubbleField_T* const bubbleField = blockIt->getData< BubbleField_T >(bubbleFieldID);
+ for (auto fieldIt = bubbleField->begin(); fieldIt != bubbleField->end(); ++fieldIt)
+ {
+ // rename an existing bubble ID in bubbleField
+ if (*fieldIt != INVALID_BUBBLE_ID) { newBubbleContainer->mapTemporalToNewBubbleID(*fieldIt); }
+ }
+ }
+}
+
+} // namespace bubble_model
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/bubble_model/NewBubbleCommunication.h b/src/lbm/free_surface/bubble_model/NewBubbleCommunication.h
new file mode 100644
index 0000000000000000000000000000000000000000..0f5e831239520354ed8f5adc45ea5c1a4b2f8207
--- /dev/null
+++ b/src/lbm/free_surface/bubble_model/NewBubbleCommunication.h
@@ -0,0 +1,126 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file NewBubbleCommunication.h
+//! \ingroup bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Communication for the creation of new bubbles.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/logging/Logging.h"
+
+#include <vector>
+
+#include "Bubble.h"
+#include "BubbleDefinitions.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+// forward declaration of internal data structure
+class CommunicatedNewBubbles;
+
+/***********************************************************************************************************************
+ * Communication for the creation of new bubbles.
+ *
+ * - Manages the distribution of newly created bubbles.
+ * - Bubbles must have the same BubbleID everywhere, since BubbleID is an index in the global bubble array. Thus, a
+ * problem arises when two (or more) processes add a new bubble in the same time step.
+ * - Every bubble is first created via this class and assigned a temporary BubbleID that is not used, yet.
+ * - These data are then synchronized in a communication step.
+ * - New bubbles are sorted by process rank such that there is then a sorted array of new bubbles that is identical on
+ * each process.
+ * - This vector of new bubbles can then be appended/inserted into the global bubble array.
+ * - Finally, temporary bubble IDs in the bubble field are renamed to global IDs.
+ *
+ * Usage example:
+ * \code
+ NewBubbleCommunication newBubbleComm;
+
+ //the following lines are usually different on different processes:
+ BubbleID newID = newBubbleComm.createBubble( Bubble ( ... ) );
+ BubbleID anotherID = newBubbleComm.createBubble( Bubble ( ... ) );
+ // use the returned temporary bubble IDs in the BubbleField
+
+ // The following call, updates the global bubble vector and the bubble field.
+ // Here the new bubbles are appended to the vector and the temporary bubble IDs in the bubble field are
+ // mapped to global IDs.
+ newBubbleComm.communicateAndApply( globalBubbleVector, blockStorage, bubbleFieldID );
+
+ * \endcode
+ *
+ *
+ **********************************************************************************************************************/
+class NewBubbleCommunication
+{
+ public:
+ explicit NewBubbleCommunication(uint_t nrOfExistingBubbles = uint_c(0))
+ {
+ // initialize the temporary bubble ID with the currently registered number of bubbles
+ nextFreeBubbleID_ = numeric_cast< BubbleID >(nrOfExistingBubbles);
+ }
+
+ // add a new bubble which gets assigned a temporary bubble ID that should be stored in bubbleField; temporary IDs are
+ // converted to valid global IDs in communicateAndApply() later
+ BubbleID createBubble(const Bubble& newBubble)
+ {
+ bubblesToCreate_.push_back(newBubble);
+
+ // get a temporary bubble ID
+ return nextFreeBubbleID_++;
+ }
+
+ // get the temporary bubble ID that is returned at the next call to createBubble()
+ BubbleID nextFreeBubbleID() const { return nextFreeBubbleID_; }
+
+ /********************************************************************************************************************
+ * Communicate all locally added bubbles and append them to a global bubble array. Convert the preliminary bubble IDs
+ * in the bubble field to global IDs.
+ *******************************************************************************************************************/
+ void communicateAndApply(std::vector< Bubble >& vectorToAddBubbles, StructuredBlockStorage& blockStorage,
+ BlockDataID bubbleFieldID);
+
+ /********************************************************************************************************************
+ * Communicate all locally added bubbles and delete bubbles marked inside a boolean array. Convert the preliminary
+ * bubble IDs in the bubble field to global IDs. Instead of appending all new bubbles, first all "holes" in the
+ * globalVector are filled
+ *
+ * \Important: - the bubblesToOverwrite vector must be the same on all processes, i.e., it has to be communicated/
+ * reduced before calling this function
+ * - bubblesToCreate_.size() > number of "true"s in bubblesToOverwrite, i.e., more new bubbles have to be
+ * created than deleted
+ *******************************************************************************************************************/
+ void communicateAndApply(std::vector< Bubble >& vectorToAddBubbles, const std::vector< bool >& bubblesToOverwrite,
+ StructuredBlockStorage& blockStorage, BlockDataID bubbleFieldID);
+
+ private:
+ // communicate all new local bubbles and store the (MPI) gathered new bubbles in the returned object;
+ // bubblesToCreate_ is cleared
+ std::shared_ptr< CommunicatedNewBubbles > communicate(size_t nrOfBubblesBefore);
+
+ BubbleID nextFreeBubbleID_; // temporary bubble ID
+ std::vector< Bubble > bubblesToCreate_;
+}; // class NewBubbleCommunication
+
+} // namespace bubble_model
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/bubble_model/RegionalFloodFill.h b/src/lbm/free_surface/bubble_model/RegionalFloodFill.h
new file mode 100644
index 0000000000000000000000000000000000000000..c0f75536a9346c890729971d734383850bcc8fb5
--- /dev/null
+++ b/src/lbm/free_surface/bubble_model/RegionalFloodFill.h
@@ -0,0 +1,254 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file RegionalFloodFill.h
+//! \ingroup bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Flood fill algorithm in a constrained neighborhood around a cell.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "field/GhostLayerField.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+/***********************************************************************************************************************
+ *
+ * Flood fill algorithm in a constrained neighborhood around a cell.
+ *
+ * This algorithm is used to check if a bubble has split up. A split detection is triggered
+ * when an interface cell becomes a fluid cell. The normal case is to check in a 1-neighborhood if
+ * the bubble has split up: ("-" means no bubble, numbers indicate bubble IDs)
+ * Example: 0 0 -
+ * - x -
+ * 0 0 -
+ * In this case, the bubble has split up.
+ *
+ * This check in a 1-neighborhood is performed by the function BubbleModel::mapNeighborhood().
+ *
+ * To look only in 1-neighborhoods has the drawback that we trigger splits when no split has occurred. This is OK, since
+ * later it is detected that the bubble has not really split. However, this process requires communication and is
+ * therefore expensive.
+ *
+ * The RegionalFloodFill has the task to rule out splits before they are triggered by looking at larger neighborhoods.
+ *
+ * Example: (same as above but with larger neighborhood)
+ * 0 0 0 - -
+ * 0 0 0 - -
+ * 0 - x - -
+ * 0 0 0 - -
+ * 0 0 0 - -
+ * By looking at the 2-neighborhood we see that the bubble has not really split up.
+ * The RegionalFloodFill needs as input the current cell (marked with x), a direction to start, e.g., N, and the size of
+ * the neighborhood to look at, e.g., 2. In this case, it creates a small 5x5x5 field where a flood fill is executed.
+ * The field might be smaller if the cell is near the boundary, as the algorithm is capable of detecting boundaries.
+ *
+ **********************************************************************************************************************/
+template< typename T, typename Stencil_T >
+class RegionalFloodFill
+{
+ public:
+ RegionalFloodFill(const GhostLayerField< T, 1 >* externField, const Cell& startCell,
+ stencil::Direction startDirection, const T& searchValue, cell_idx_t neighborhood = 2);
+
+ RegionalFloodFill(const GhostLayerField< T, 1 >* externField, const Cell& startCell, const T& emptyValue,
+ cell_idx_t neighborhood = 2);
+
+ ~RegionalFloodFill() { delete workingField_; }
+
+ inline bool connected(stencil::Direction d);
+ inline bool connected(cell_idx_t xOff, cell_idx_t yOff, cell_idx_t zOff);
+
+ const Field< bool, 1 >& workingField() const { return *workingField_; }
+
+ protected:
+ inline bool cellInsideAndNotMarked(const Cell& cell);
+
+ void runFloodFill(const Cell& startCell, stencil::Direction startDirection, const T& searchValue,
+ cell_idx_t neighborhood);
+
+ const GhostLayerField< T, 1 >* externField_;
+ Field< bool, 1 >* workingField_;
+
+ // the size of the working field is 2*neighborhood+1 for storing startCell (+1) and neighborhood in each direction;
+ // boundaries in externField_ reduce the size of workingField_ accordingly
+ CellInterval workingFieldSize_;
+
+ T searchValue_;
+ Cell offset_; // offset of workingField_, allows coordinate transformations:
+ // externFieldCoordinates = workingFieldCoordinates + offset
+ Cell startCellInWorkingField_;
+}; // class RegionalFloodFill
+
+// iterate over all neighboring cells and run flood fill with starting direction of first neighboring cell whose value
+// is not equal to emptyValue
+template< typename T, typename Stencil_T >
+RegionalFloodFill< T, Stencil_T >::RegionalFloodFill(const GhostLayerField< T, 1 >* externField, const Cell& startCell,
+ const T& emptyValue, cell_idx_t neighborhood)
+ : externField_(externField), workingField_(nullptr)
+{
+ for (auto d = Stencil_T::begin(); d != Stencil_T::end(); ++d)
+ {
+ const T& neighborValue = externField_->getNeighbor(startCell, *d);
+ if (neighborValue != emptyValue)
+ {
+ // run flood fill with starting direction of first non-empty neighboring cell
+ runFloodFill(startCell, *d, neighborValue, neighborhood);
+ return;
+ }
+ }
+
+ WALBERLA_ASSERT(false); // should not happen, only empty values in neighborhood
+}
+
+/***********************************************************************************************************************
+ * Create a small overlay field in given neighborhood and execute a flood fill in this small field.
+ *
+ * The flood fill starts in startCell and startDirection. The neighboring cell of startCell in startDirection has to be
+ * set to searchValue. The size of the neighborhood is specified by neighborhood. In case of nearby boundary in a
+ * certain direction, the size of the neighborhood is automatically reduced in this direction.
+ **********************************************************************************************************************/
+template< typename T, typename Stencil_T >
+RegionalFloodFill< T, Stencil_T >::RegionalFloodFill(const GhostLayerField< T, 1 >* externField, const Cell& startCell,
+ stencil::Direction startDirection, const T& searchValue,
+ cell_idx_t neighborhood)
+ : externField_(externField), workingField_(nullptr)
+{
+ runFloodFill(startCell, startDirection, searchValue, neighborhood);
+}
+
+template< typename T, typename Stencil_T >
+void RegionalFloodFill< T, Stencil_T >::runFloodFill(const Cell& startCell, stencil::Direction startDirection,
+ const T& searchValue, cell_idx_t neighborhood)
+{
+ searchValue_ = searchValue;
+
+ const cell_idx_t externFieldGhostLayers = cell_idx_c(externField_->nrOfGhostLayers());
+
+ // size of workingField_ is defined by the number of cells around startCell
+ cell_idx_t extendLower[3]; // number of cells in negative x-, y-, and z-direction of startCell
+ cell_idx_t extendUpper[3]; // number of cells in negative x-, y-, and z-direction of startCell
+
+ // determine the size of the working field with respect to boundaries of externField_
+ for (uint_t i = uint_c(0); i < uint_c(3); ++i)
+ {
+ const cell_idx_t minCoord = -externFieldGhostLayers;
+ const cell_idx_t maxCoord = cell_idx_c(externField_->size(i)) - cell_idx_c(1) + externFieldGhostLayers;
+
+ // in case of nearby boundaries in externField_, the size of workingField_ is adjusted such that these boundaries
+ // are respected
+ extendLower[i] = std::min(neighborhood, startCell[i] - minCoord);
+ extendUpper[i] = std::min(neighborhood, maxCoord - startCell[i]);
+ }
+
+ // offset_ can be used to transform coordinates from externField_ to coordinates of workingField_
+ offset_ = Cell(startCell[0] - extendLower[0], startCell[1] - extendLower[1], startCell[2] - extendLower[2]);
+
+ startCellInWorkingField_ = startCell - offset_;
+
+ // create workingField_
+ workingField_ = new Field< bool, 1 >(uint_c(1) + uint_c(extendLower[0] + extendUpper[0]),
+ uint_c(1) + uint_c(extendLower[1] + extendUpper[1]),
+ uint_c(1) + uint_c(extendLower[2] + extendUpper[2]), false);
+
+ workingFieldSize_ = workingField_->xyzSize();
+
+ // mark the startCell such that flood fill can not take a path across startCell
+ workingField_->get(startCellInWorkingField_) = true;
+
+ // use stack to store cells that still need to be searched
+ std::vector< Cell > stack;
+ stack.reserve(Stencil_T::Size);
+ stack.emplace_back(startCellInWorkingField_[0] + stencil::cx[startDirection],
+ startCellInWorkingField_[1] + stencil::cy[startDirection],
+ startCellInWorkingField_[2] + stencil::cz[startDirection]);
+
+ while (!stack.empty())
+ {
+ // next search cell is the last entry in stack
+ Cell currentCell = stack.back();
+
+ // remove the searched cell from stack
+ stack.pop_back();
+
+ WALBERLA_ASSERT_EQUAL(externField_->get(currentCell + offset_), searchValue_);
+
+ // mark the searched cell to be connected in workingField_
+ workingField_->get(currentCell) = true;
+
+ // iterate over all existing neighbors that are not yet marked and push them onto the stack
+ for (auto d = Stencil_T::beginNoCenter(); d != Stencil_T::end(); ++d)
+ {
+ Cell neighbor(currentCell[0] + d.cx(), currentCell[1] + d.cy(), currentCell[2] + d.cz());
+
+ // check if neighboring cell is:
+ // - inside workingField_
+ // - not yet marked as connected
+ // - connected to this cell
+ if (cellInsideAndNotMarked(neighbor))
+ {
+ // add neighbor to stack such that it gets marked as connected and used as start cell in the next iteration;
+ // cells that are not connected to startCell will never get marked as connected
+ stack.push_back(neighbor);
+ }
+ }
+ }
+}
+
+// check if startCell is connected to the neighboring cell in direction d
+template< typename T, typename Stencil_T >
+bool RegionalFloodFill< T, Stencil_T >::connected(stencil::Direction d)
+{
+ using namespace stencil;
+ return workingField_->get(startCellInWorkingField_[0] + cx[d], startCellInWorkingField_[1] + cy[d],
+ startCellInWorkingField_[2] + cz[d]);
+}
+
+// check if startCell is connected to the cell with some offset from startCell
+template< typename T, typename Stencil_T >
+bool RegionalFloodFill< T, Stencil_T >::connected(cell_idx_t xOff, cell_idx_t yOff, cell_idx_t zOff)
+{
+ return workingField_->get(startCellInWorkingField_[0] + xOff, startCellInWorkingField_[1] + yOff,
+ startCellInWorkingField_[2] + zOff);
+}
+
+// check if cell is:
+// - inside workingField_
+// - not yet marked as connected
+// - connected to this cell
+template< typename T, typename Stencil_T >
+bool RegionalFloodFill< T, Stencil_T >::cellInsideAndNotMarked(const Cell& cell)
+{
+ if (!workingFieldSize_.contains(cell)) { return false; }
+
+ // check if cell is already marked as connected
+ if (!workingField_->get(cell))
+ {
+ // test if cell is connected
+ return (externField_->get(cell + offset_) == searchValue_);
+ }
+ else { return false; }
+}
+
+} // namespace bubble_model
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/dynamics/CMakeLists.txt b/src/lbm/free_surface/dynamics/CMakeLists.txt
new file mode 100644
index 0000000000000000000000000000000000000000..458fabdfe2354a6879e1c826fa2577b0b7cbc866
--- /dev/null
+++ b/src/lbm/free_surface/dynamics/CMakeLists.txt
@@ -0,0 +1,17 @@
+target_sources( lbm
+ PRIVATE
+ CellConversionSweep.h
+ ConversionFlagsResetSweep.h
+ ExcessMassDistributionModel.h
+ ExcessMassDistributionSweep.h
+ ExcessMassDistributionSweep.impl.h
+ ForceWeightingSweep.h
+ PdfReconstructionModel.h
+ PdfRefillingModel.h
+ PdfRefillingSweep.h
+ PdfRefillingSweep.impl.h
+ StreamReconstructAdvectSweep.h
+ SurfaceDynamicsHandler.h
+ )
+
+add_subdirectory( functionality )
\ No newline at end of file
diff --git a/src/lbm/free_surface/dynamics/CellConversionSweep.h b/src/lbm/free_surface/dynamics/CellConversionSweep.h
new file mode 100644
index 0000000000000000000000000000000000000000..4e913b657c1c2c9727ce2976a145db82e36dc68a
--- /dev/null
+++ b/src/lbm/free_surface/dynamics/CellConversionSweep.h
@@ -0,0 +1,315 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file CellConversionSweep.h
+//! \ingroup dynamics
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Convert cells to/from interface cells.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "field/FlagField.h"
+
+#include "lbm/field/MacroscopicValueCalculation.h"
+#include "lbm/field/PdfField.h"
+#include "lbm/free_surface/FlagInfo.h"
+#include "lbm/free_surface/boundary/FreeSurfaceBoundaryHandling.h"
+#include "lbm/free_surface/bubble_model/BubbleModel.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Convert cells to/from interface
+ * - expects that a previous sweep has set the convertToLiquidFlag and convertToGasFlag flags
+ * - notifies the bubble model that conversions occurred
+ * - all cells that have been converted, have the "converted" flag set
+ * - PDF field is required in order to initialize the velocity in new gas cells with information from surrounding cells
+ *
+ * A) Interface -> Liquid/Gas
+ * - always converts interface to liquid
+ * - converts interface to gas only if no newly created liquid cell is in neighborhood
+ * B) Liquid/Gas -> Interface (to obtain a closed interface layer)
+ * - "old" liquid cells in the neighborhood of newly converted cells in A) are converted to interface
+ * - "old" gas cells in the neighborhood of newly converted cells in A) are converted to interface
+ * The term "old" refers to cells that were not converted themselves in the same time step.
+ * C) GAS -> INTERFACE (due to inflow boundary condition)
+ * D) LIQUID/GAS -> INTERFACE (due to wetting; only when using local triangulation for curvature computation)
+ *
+ * For gas cells that were converted to interface in B), the flag "convertedFromGasToInterface" is set to signal another
+ * sweep (i.e. "PdfRefillingSweep.h") that the this cell's PDFs need to be reinitialized.
+ *
+ * For gas cells that were converted to interface in C), the cell's PDFs are reinitialized with equilibrium constructed
+ * with the inflow velocity.
+ *
+ * More information can be found in the dissertation of N. Thuerey, 2007, section 4.3.
+ * ********************************************************************************************************************/
+template< typename LatticeModel_T, typename BoundaryHandling_T, typename ScalarField_T >
+class CellConversionSweep
+{
+ public:
+ using FlagField_T = typename BoundaryHandling_T::FlagField;
+ using flag_t = typename FlagField_T::flag_t;
+ using PdfField_T = lbm::PdfField< LatticeModel_T >;
+ using Stencil_T = typename LatticeModel_T::Stencil;
+
+ CellConversionSweep(BlockDataID handlingID, BlockDataID pdfFieldID, const FlagInfo< FlagField_T >& flagInfo,
+ BubbleModelBase* bubbleModel)
+ : handlingID_(handlingID), pdfFieldID_(pdfFieldID), bubbleModel_(bubbleModel), flagInfo_(flagInfo)
+ {}
+
+ void operator()(IBlock* const block)
+ {
+ BoundaryHandling_T* const handling = block->getData< BoundaryHandling_T >(handlingID_);
+ PdfField_T* const pdfField = block->getData< PdfField_T >(pdfFieldID_);
+
+ FlagField_T* const flagField = handling->getFlagField();
+
+ // A) INTERFACE -> LIQUID/GAS
+ // convert interface cells that have filled/emptied to liquid/gas (cflagInfo_. dissertation of N. Thuerey, 2007,
+ // section 4.3)
+ // the conversion is also performed in the first ghost layer, since B requires an up-to-date first ghost layer;
+ // explicitly avoid OpenMP, as bubble IDs are set here
+ WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ_OMP(flagField, uint_c(1), omp critical, {
+ const typename FlagField_T::ConstPtr flagFieldPtr(*flagField, x, y, z);
+
+ // 1) convert interface cells to liquid
+ if (isFlagSet(flagFieldPtr, flagInfo_.convertToLiquidFlag))
+ {
+ handling->removeFlag(flagInfo_.interfaceFlag, x, y, z);
+ handling->setFlag(flagInfo_.liquidFlag, x, y, z);
+ handling->setFlag(flagInfo_.convertedFlag, x, y, z);
+
+ if (flagField->isInInnerPart(flagFieldPtr.cell()))
+ {
+ // register and detect splitting of bubbles
+ bubbleModel_->reportInterfaceToLiquidConversion(block, flagFieldPtr.cell());
+ }
+ }
+
+ // 2) convert interface cells to gas only if no newly converted liquid cell from 1) is in neighborhood to
+ // ensure a closed interface
+ if (isFlagSet(flagFieldPtr, flagInfo_.convertToGasFlag) &&
+ !isFlagInNeighborhood< Stencil_T >(flagFieldPtr, flagInfo_.convertToLiquidFlag))
+ {
+ handling->removeFlag(flagInfo_.interfaceFlag, x, y, z);
+ handling->setFlag(flagInfo_.gasFlag, x, y, z);
+ handling->setFlag(flagInfo_.convertedFlag, x, y, z);
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ_OMP
+
+ // B) LIQUID/GAS -> INTERFACE
+ // convert those liquid/gas cells to interface that are in the neighborhood of the newly created liquid/gas cells
+ // from A; this maintains a closed interface layer;
+ // explicitly avoid OpenMP, as bubble IDs are set here
+ WALBERLA_FOR_ALL_CELLS_XYZ_OMP(flagField, omp critical, {
+ const typename FlagField_T::ConstPtr flagFieldPtr(*flagField, x, y, z);
+
+ // only consider "old" liquid cells, i.e., cells that have not been converted in this time step
+ if (flagInfo_.isLiquid(flagFieldPtr) && !flagInfo_.hasConverted(flagFieldPtr))
+ {
+ const flag_t newGasFlagMask = flagInfo_.convertedFlag | flagInfo_.gasFlag; // flag newly converted gas cell
+
+ // the state of ghost layer cells becomes relevant here
+ for (auto d = LatticeModel_T::Stencil::beginNoCenter(); d != LatticeModel_T::Stencil::end(); ++d)
+ if (isMaskSet(flagFieldPtr.neighbor(*d), newGasFlagMask)) // newly converted gas cell is in neighborhood
+ {
+ // convert the current cell to interface
+ handling->removeFlag(flagInfo_.liquidFlag, x, y, z);
+ handling->setFlag(flagInfo_.interfaceFlag, x, y, z);
+ handling->setFlag(flagInfo_.convertedFlag, x, y, z);
+
+ if (flagField->isInInnerPart(flagFieldPtr.cell()))
+ {
+ // register and detect merging of bubbles
+ bubbleModel_->reportLiquidToInterfaceConversion(block, flagFieldPtr.cell());
+ }
+
+ // current cell was already converted to interface, flags of other neighbors are not relevant
+ break;
+ }
+ }
+ // only consider "old" gas cells, i.e., cells that have not been converted in this time step
+ else
+ {
+ if (flagInfo_.isGas(flagFieldPtr) && !flagInfo_.hasConverted(flagFieldPtr))
+ {
+ const flag_t newLiquidFlagMask =
+ flagInfo_.convertedFlag | flagInfo_.liquidFlag; // flag of newly converted liquid cell
+
+ // the state of ghost layer cells is relevant here
+ for (auto d = LatticeModel_T::Stencil::beginNoCenter(); d != LatticeModel_T::Stencil::end(); ++d)
+
+ // newly converted liquid cell is in neighborhood
+ if (isMaskSet(flagFieldPtr.neighbor(*d), newLiquidFlagMask))
+ {
+ // convert the current cell to interface
+ handling->removeFlag(flagInfo_.gasFlag, x, y, z);
+ handling->setFlag(flagInfo_.interfaceFlag, x, y, z);
+ handling->setFlag(flagInfo_.convertedFlag, x, y, z);
+ handling->setFlag(flagInfo_.convertFromGasToInterfaceFlag, x, y, z);
+
+ // current cell was already converted to interface, flags of other neighbors are not relevant
+ break;
+ }
+ }
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_XYZ_OMP
+
+ // C) GAS -> INTERFACE (due to inflow boundary condition)
+ // convert gas cells to interface cells near inflow boundaries;
+ // explicitly avoid OpenMP, such that cell conversions are performed sequentially
+ convertedFromGasToInterfaceDueToInflow.clear();
+ WALBERLA_FOR_ALL_CELLS_XYZ_OMP(flagField, omp critical, {
+ const typename FlagField_T::ConstPtr flagFieldPtr(*flagField, x, y, z);
+
+ if (flagInfo_.isConvertToInterfaceForInflow(flagFieldPtr) && !flagInfo_.hasConverted(flagFieldPtr))
+ {
+ // newly converted liquid cell is in neighborhood
+ handling->removeFlag(flagInfo_.convertToInterfaceForInflowFlag, x, y, z);
+
+ // convert the current cell to interface
+ handling->removeFlag(flagInfo_.gasFlag, x, y, z);
+ handling->setFlag(flagInfo_.interfaceFlag, x, y, z);
+ handling->setFlag(flagInfo_.convertedFlag, x, y, z);
+ convertedFromGasToInterfaceDueToInflow.insert(flagFieldPtr.cell());
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_XYZ_OMP
+
+ // D) LIQUID/GAS -> INTERFACE (due to wetting; only active when using local triangulation for curvature
+ // computation)
+ // convert liquid/gas to interface cells where the interface cell is required for a smooth
+ // continuation of the wetting surface (see dissertation of S. Donath, 2011, section 6.3.5.3);
+ // explicitly avoid OpenMP, as bubble IDs are set here
+ WALBERLA_FOR_ALL_CELLS_XYZ_OMP(flagField, omp critical, {
+ const typename FlagField_T::ConstPtr flagFieldPtr(*flagField, x, y, z);
+
+ // only consider wetting and non-interface cells
+ if (flagInfo_.isKeepInterfaceForWetting(flagFieldPtr) && !flagInfo_.isInterface(flagFieldPtr))
+ {
+ // convert liquid cell to interface
+ if (isFlagSet(flagFieldPtr, flagInfo_.liquidFlag))
+ {
+ handling->removeFlag(flagInfo_.liquidFlag, x, y, z);
+ handling->setFlag(flagInfo_.interfaceFlag, x, y, z);
+ handling->setFlag(flagInfo_.convertedFlag, x, y, z);
+ handling->removeFlag(flagInfo_.keepInterfaceForWettingFlag, x, y, z);
+ if (flagField->isInInnerPart(flagFieldPtr.cell()))
+ {
+ // register and detect merging of bubbles
+ bubbleModel_->reportLiquidToInterfaceConversion(block, flagFieldPtr.cell());
+ }
+ }
+ else
+ {
+ // convert gas cell to interface
+ if (isFlagSet(flagFieldPtr, flagInfo_.gasFlag))
+ {
+ handling->removeFlag(flagInfo_.gasFlag, x, y, z);
+ handling->setFlag(flagInfo_.interfaceFlag, x, y, z);
+ handling->setFlag(flagInfo_.convertedFlag, x, y, z);
+ handling->removeFlag(flagInfo_.keepInterfaceForWettingFlag, x, y, z);
+ handling->setFlag(flagInfo_.convertFromGasToInterfaceFlag, x, y, z);
+ }
+ }
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_XYZ_OMP
+
+ // initialize PDFs of interface cells that were created due to an inflow boundary; the PDFs are set to equilibrium
+ // with density=1 and velocity of the inflow boundary
+ initializeFromInflow(convertedFromGasToInterfaceDueToInflow, flagField, pdfField, handling);
+ }
+
+ protected:
+ /********************************************************************************************************************
+ * Initializes PDFs in cells that are converted to interface due to a neighboring inflow boundary.
+ *
+ * The PDFs of these cells are set to equilibrium values using density=1 and the average velocity of neighboring
+ * inflow boundaries. An inflow cell is used for averaging only if the velocity actually flows towards the newly
+ * created interface cell. In other words, the velocity direction is compared to the converted cell's direction with
+ * respect to the inflow location.
+ *
+ * REMARK: The inflow boundary condition must implement function "getValue()" that returns the prescribed velocity
+ * (see e.g. UBB).
+ *******************************************************************************************************************/
+ void initializeFromInflow(const std::set< Cell >& cells, FlagField_T* flagField, PdfField_T* pdfField,
+ BoundaryHandling_T* handling)
+ {
+ for (auto setIt = cells.begin(); setIt != cells.end(); ++setIt)
+ {
+ const Cell& cell = *setIt;
+
+ Vector3< real_t > u(real_c(0.0));
+ uint_t numNeighbors = uint_c(0);
+
+ // get UBB inflow boundary
+ auto ubbInflow = handling->template getBoundaryCondition<
+ typename FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::UBB_Inflow_T >(
+ handling->getBoundaryUID(
+ FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::ubbInflowFlagID));
+
+ for (auto i = LatticeModel_T::Stencil::beginNoCenter(); i != LatticeModel_T::Stencil::end(); ++i)
+ {
+ using namespace stencil;
+ const Cell neighborCell(cell[0] + i.cx(), cell[1] + i.cy(), cell[2] + i.cz());
+
+ const flag_t neighborFlag = flagField->get(neighborCell);
+
+ // neighboring cell is inflow
+ if (isPartOfMaskSet(neighborFlag, flagInfo_.inflowFlagMask))
+ {
+ // get direction towards cell containing inflow boundary
+ const Vector3< int > dir = Vector3< int >(-i.cx(), -i.cy(), -i.cz());
+
+ // get velocity from UBB boundary
+ const Vector3< real_t > inflowVel =
+ ubbInflow.getValue(cell[0] + i.cx(), cell[1] + i.cy(), cell[2] + i.cz());
+
+ // skip directions in which the corresponding velocity component is zero
+ if (realIsEqual(inflowVel[0], real_c(0), real_c(1e-14)) && dir[0] != 0) { continue; }
+ if (realIsEqual(inflowVel[1], real_c(0), real_c(1e-14)) && dir[1] != 0) { continue; }
+ if (realIsEqual(inflowVel[2], real_c(0), real_c(1e-14)) && dir[2] != 0) { continue; }
+
+ // skip directions in which the corresponding velocity component is in opposite direction
+ if (inflowVel[0] > real_c(0) && dir[0] < 0) { continue; }
+ if (inflowVel[1] > real_c(0) && dir[1] < 0) { continue; }
+ if (inflowVel[2] > real_c(0) && dir[2] < 0) { continue; }
+
+ // use inflow velocity to get average velocity
+ u += inflowVel;
+ numNeighbors++;
+ }
+ }
+ if (numNeighbors > uint_c(0)) { u /= real_c(numNeighbors); } // else: velocity is zero
+
+ pdfField->setDensityAndVelocity(cell, u, real_c(1)); // set density=1
+ }
+ }
+
+ BlockDataID handlingID_;
+ BlockDataID pdfFieldID_;
+ BubbleModelBase* bubbleModel_;
+
+ FlagInfo< FlagField_T > flagInfo_;
+
+ std::set< Cell > convertedFromGasToInterfaceDueToInflow;
+}; // class CellConversionSweep
+
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/dynamics/ConversionFlagsResetSweep.h b/src/lbm/free_surface/dynamics/ConversionFlagsResetSweep.h
new file mode 100644
index 0000000000000000000000000000000000000000..4eb74cedef75e52794aa801080244a9e4c549fd6
--- /dev/null
+++ b/src/lbm/free_surface/dynamics/ConversionFlagsResetSweep.h
@@ -0,0 +1,70 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file ResetFlagSweep.h
+//! \ingroup dynamics
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Reset all free surface flags that mark cell conversions.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/logging/Logging.h"
+
+#include "domain_decomposition/BlockDataID.h"
+
+#include "field/FlagField.h"
+
+#include "lbm/free_surface/FlagInfo.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Reset all free surface flags that signal cell conversions. The flag "keepInterfaceForWettingFlag" is explicitly not
+ * reset since this flag must persist in the next time step.
+ **********************************************************************************************************************/
+template< typename FlagField_T >
+class ConversionFlagsResetSweep
+{
+ public:
+ ConversionFlagsResetSweep(BlockDataID flagFieldID, const FlagInfo< FlagField_T >& flagInfo)
+ : flagFieldID_(flagFieldID), flagInfo_(flagInfo)
+ {}
+
+ void operator()(IBlock* const block)
+ {
+ FlagField_T* const flagField = block->getData< FlagField_T >(flagFieldID_);
+
+ // reset all conversion flags (except flagInfo_.keepInterfaceForWettingFlag)
+ const flag_t allConversionFlags = flagInfo_.convertToGasFlag | flagInfo_.convertToLiquidFlag |
+ flagInfo_.convertedFlag | flagInfo_.convertFromGasToInterfaceFlag |
+ flagInfo_.convertToInterfaceForInflowFlag;
+ WALBERLA_FOR_ALL_CELLS(flagFieldIt, flagField,
+ { removeMask(flagFieldIt, allConversionFlags); }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ private:
+ using flag_t = typename FlagField_T::flag_t;
+
+ BlockDataID flagFieldID_;
+ FlagInfo< FlagField_T > flagInfo_;
+}; // class ConversionFlagsResetSweep
+
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/dynamics/ExcessMassDistributionModel.h b/src/lbm/free_surface/dynamics/ExcessMassDistributionModel.h
new file mode 100644
index 0000000000000000000000000000000000000000..2e4d0b798ca3fb8bf6e325f38abfaa30119291fc
--- /dev/null
+++ b/src/lbm/free_surface/dynamics/ExcessMassDistributionModel.h
@@ -0,0 +1,214 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file ExcessMassDistributionModel.h
+//! \ingroup dynamics
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Class that specifies how excessive mass is distributed.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/StringUtility.h"
+#include "core/stringToNum.h"
+
+#include <string>
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Class that specifies how excessive mass is distributed after cell conversions from interface to liquid or interface
+ * to gas.
+ * For example, when converting an interface cell with fill level 1.1 to liquid with fill level 1,0, an excessive mass
+ * corresponding to the fill level 0.1 must be distributed.
+ *
+ * Available models:
+ * - EvenlyAllInterface:
+ * Excess mass is distributed evenly among all neighboring interface cells (see dissertations of T. Pohl, S.
+ * Donath, S. Bogner).
+ *
+ * - EvenlyNewInterface:
+ * Excess mass is distributed evenly among newly converted neighboring interface cells (see Koerner et al., 2005).
+ * Falls back to EvenlyAllInterface if not applicable.
+ *
+ * - EvenlyOldInterface:
+ * Excess mass is distributed evenly among old neighboring interface cells, i.e., cells that are non-newly
+ * converted to interface. Falls back to EvenlyAllInterface if not applicable.
+ *
+ * - WeightedAllInterface:
+ * Excess mass is distributed weighted with the direction of the interface normal among all neighboring interface
+ * cells (see dissertation of N. Thuerey, 2007). Falls back to EvenlyAllInterface if not applicable.
+ *
+ * - WeightedNewInterface:
+ * Excess mass is distributed weighted with the direction of the interface normal among newly converted
+ * neighboring interface cells. Falls back to WeightedAllInterface if not applicable.
+ *
+ * - WeightedOldInterface:
+ * Excess mass is distributed weighted with the direction of the interface normal among old neighboring interface
+ * cells, i.e., cells that are non-newly converted to interface. Falls back to WeightedAllInterface if not
+ * applicable.
+ *
+ * - EvenlyLiquidAndAllInterface:
+ * Excess mass is distributed evenly among all neighboring interface and liquid cells (see p.47 in master thesis of
+ * M. Lehmann, 2019). The excess mass distributed to liquid cells does neither modify the cell's density nor fill
+ * level. Instead, it is stored in an additional excess mass field. Therefore, not only the converted interface
+ * cells' excess mass is distributed, but also the excess mass of liquid cells stored in this additional field.
+ *
+ * - EvenlyLiquidAndAllInterfacePreferInterface:
+ * Similar to EvenlyLiquidAndAllInterface, however, excess mass is preferably distributed to interface cells. It is
+ * distributed to liquid cells only if there are no neighboring interface cells available.
+ * ********************************************************************************************************************/
+class ExcessMassDistributionModel
+{
+ public:
+ enum class ExcessMassModel {
+ EvenlyAllInterface,
+ EvenlyNewInterface,
+ EvenlyOldInterface,
+ WeightedAllInterface,
+ WeightedNewInterface,
+ WeightedOldInterface,
+ EvenlyLiquidAndAllInterface,
+ EvenlyLiquidAndAllInterfacePreferInterface
+ };
+
+ ExcessMassDistributionModel(const std::string& modelName) : modelName_(modelName), modelType_(chooseType(modelName))
+ {}
+
+ ExcessMassDistributionModel(const ExcessMassModel& modelType)
+ : modelName_(chooseName(modelType)), modelType_(modelType)
+ {
+ switch (modelType_)
+ {
+ case ExcessMassModel::EvenlyAllInterface:
+ break;
+ case ExcessMassModel::EvenlyNewInterface:
+ break;
+ case ExcessMassModel::EvenlyOldInterface:
+ break;
+ case ExcessMassModel::WeightedAllInterface:
+ break;
+ case ExcessMassModel::WeightedNewInterface:
+ break;
+ case ExcessMassModel::WeightedOldInterface:
+ break;
+ case ExcessMassModel::EvenlyLiquidAndAllInterface:
+ break;
+ case ExcessMassModel::EvenlyLiquidAndAllInterfacePreferInterface:
+ break;
+ }
+ }
+
+ inline ExcessMassModel getModelType() const { return modelType_; }
+ inline std::string getModelName() const { return modelName_; }
+ inline std::string getFullModelSpecification() const { return getModelName(); }
+
+ inline bool isEvenlyType() const
+ {
+ return modelType_ == ExcessMassModel::EvenlyAllInterface || modelType_ == ExcessMassModel::EvenlyNewInterface ||
+ modelType_ == ExcessMassModel::EvenlyOldInterface;
+ }
+
+ inline bool isWeightedType() const
+ {
+ return modelType_ == ExcessMassModel::WeightedAllInterface ||
+ modelType_ == ExcessMassModel::WeightedNewInterface || modelType_ == ExcessMassModel::WeightedOldInterface;
+ }
+
+ inline bool isEvenlyLiquidAndAllInterfacePreferInterfaceType() const
+ {
+ return modelType_ == ExcessMassModel::EvenlyLiquidAndAllInterface ||
+ modelType_ == ExcessMassModel::EvenlyLiquidAndAllInterfacePreferInterface;
+ }
+
+ static inline std::initializer_list< const ExcessMassModel > getTypeIterator() { return listOfAllEnums; }
+
+ private:
+ ExcessMassModel chooseType(const std::string& modelName)
+ {
+ if (!string_icompare(modelName, "EvenlyAllInterface")) { return ExcessMassModel::EvenlyAllInterface; }
+
+ if (!string_icompare(modelName, "EvenlyNewInterface")) { return ExcessMassModel::EvenlyNewInterface; }
+
+ if (!string_icompare(modelName, "EvenlyOldInterface")) { return ExcessMassModel::EvenlyOldInterface; }
+
+ if (!string_icompare(modelName, "WeightedAllInterface")) { return ExcessMassModel::WeightedAllInterface; }
+
+ if (!string_icompare(modelName, "WeightedNewInterface")) { return ExcessMassModel::WeightedNewInterface; }
+
+ if (!string_icompare(modelName, "WeightedOldInterface")) { return ExcessMassModel::WeightedOldInterface; }
+
+ if (!string_icompare(modelName, "EvenlyLiquidAndAllInterface"))
+ {
+ return ExcessMassModel::EvenlyLiquidAndAllInterface;
+ }
+
+ if (!string_icompare(modelName, "EvenlyLiquidAndAllInterfacePreferInterface"))
+ {
+ return ExcessMassModel::EvenlyLiquidAndAllInterfacePreferInterface;
+ }
+
+ WALBERLA_ABORT("The specified PDF reinitialization model " << modelName << " is not available.");
+ }
+
+ std::string chooseName(ExcessMassModel const& modelType) const
+ {
+ std::string modelName;
+ switch (modelType)
+ {
+ case ExcessMassModel::EvenlyAllInterface:
+ modelName = "EvenlyAllInterface";
+ break;
+ case ExcessMassModel::EvenlyNewInterface:
+ modelName = "EvenlyNewInterface";
+ break;
+ case ExcessMassModel::EvenlyOldInterface:
+ modelName = "EvenlyOldInterface";
+ break;
+ case ExcessMassModel::WeightedAllInterface:
+ modelName = "WeightedAllInterface";
+ break;
+ case ExcessMassModel::WeightedNewInterface:
+ modelName = "WeightedNewInterface";
+ break;
+ case ExcessMassModel::WeightedOldInterface:
+ modelName = "WeightedOldInterface";
+ break;
+
+ case ExcessMassModel::EvenlyLiquidAndAllInterface:
+ modelName = "EvenlyLiquidAndAllInterface";
+ break;
+ case ExcessMassModel::EvenlyLiquidAndAllInterfacePreferInterface:
+ modelName = "EvenlyLiquidAndAllInterfacePreferInterface";
+ break;
+ }
+ return modelName;
+ }
+
+ std::string modelName_;
+ ExcessMassModel modelType_;
+ static constexpr std::initializer_list< const ExcessMassModel > listOfAllEnums = {
+ ExcessMassModel::EvenlyAllInterface, ExcessMassModel::EvenlyNewInterface,
+ ExcessMassModel::EvenlyOldInterface, ExcessMassModel::WeightedAllInterface,
+ ExcessMassModel::WeightedNewInterface, ExcessMassModel::WeightedOldInterface,
+ ExcessMassModel::EvenlyLiquidAndAllInterface, ExcessMassModel::EvenlyLiquidAndAllInterfacePreferInterface
+ };
+
+}; // class ExcessMassDistributionModel
+} // namespace free_surface
+} // namespace walberla
\ No newline at end of file
diff --git a/src/lbm/free_surface/dynamics/ExcessMassDistributionSweep.h b/src/lbm/free_surface/dynamics/ExcessMassDistributionSweep.h
new file mode 100644
index 0000000000000000000000000000000000000000..ab9efe397121b33391eceedefc407811aec16ac8
--- /dev/null
+++ b/src/lbm/free_surface/dynamics/ExcessMassDistributionSweep.h
@@ -0,0 +1,212 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file ExcessMassDistributionSweep.h
+//! \ingroup dynamics
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Distribute excess mass, i.e., mass that is undistributed after conversions from interface to liquid or gas.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/logging/Logging.h"
+
+#include "domain_decomposition/BlockDataID.h"
+
+#include "field/FieldClone.h"
+#include "field/FlagField.h"
+#include "field/GhostLayerField.h"
+
+#include "lbm/field/PdfField.h"
+#include "lbm/free_surface/FlagInfo.h"
+
+#include "ExcessMassDistributionModel.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Distribute excess mass, i.e., mass that is undistributed after cells have been converted from interface to
+ * gas/liquid. For example, when converting an interface cell with fill level 1.1 to liquid with fill level 1.0, an
+ * excessive mass corresponding to the fill level 0.1 must be distributed to conserve mass.
+ **********************************************************************************************************************/
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+class ExcessMassDistributionSweepBase
+{
+ public:
+ ExcessMassDistributionSweepBase(const ExcessMassDistributionModel& excessMassDistributionModel,
+ BlockDataID fillFieldID, ConstBlockDataID flagFieldID, ConstBlockDataID pdfFieldID,
+ const FlagInfo< FlagField_T >& flagInfo)
+ : excessMassDistributionModel_(excessMassDistributionModel), fillFieldID_(fillFieldID), flagFieldID_(flagFieldID),
+ pdfFieldID_(pdfFieldID), flagInfo_(flagInfo)
+ {}
+
+ virtual void operator()(IBlock* const block) = 0;
+
+ virtual ~ExcessMassDistributionSweepBase() = default;
+
+ protected:
+ /********************************************************************************************************************
+ * Determines the number of a cell's
+ * - neighboring newly-converted interface cells
+ * - neighboring interface cells (regardless if newly converted or not)
+ *******************************************************************************************************************/
+ void getNumberOfInterfaceNeighbors(const FlagField_T* flagField, const Cell& cell, uint_t& newInterfaceNeighbors,
+ uint_t& interfaceNeighbors);
+
+ /********************************************************************************************************************
+ * Determines the number of a cell's neighboring liquid and interface cells.
+ *******************************************************************************************************************/
+ void getNumberOfEvenlyLiquidAndAllInterfacePreferInterfaceNeighbors(const FlagField_T* flagField, const Cell& cell,
+ uint_t& liquidNeighbors,
+ uint_t& interfaceNeighbors);
+
+ ExcessMassDistributionModel excessMassDistributionModel_;
+ BlockDataID fillFieldID_;
+ ConstBlockDataID flagFieldID_;
+ ConstBlockDataID pdfFieldID_;
+ FlagInfo< FlagField_T > flagInfo_;
+}; // class ExcessMassDistributionSweep
+
+/***********************************************************************************************************************
+ * Distribute the excess mass evenly among either
+ * - all neighboring interface cells (see dissertations of T. Pohl, S. Donath, S. Bogner).
+ * - newly converted interface cells (see Koerner et al., 2005)
+ * - old, i.e., non-newly converted interface cells
+ *
+ * If either no newly converted interface cell or old interface cell is available in the neighborhood, the
+ * respective other approach is used as fallback.
+ **********************************************************************************************************************/
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+class ExcessMassDistributionSweepInterfaceEvenly
+ : public ExcessMassDistributionSweepBase< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >
+{
+ public:
+ using ExcessMassDistributionSweepBase_T =
+ ExcessMassDistributionSweepBase< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >;
+
+ ExcessMassDistributionSweepInterfaceEvenly(const ExcessMassDistributionModel& excessMassDistributionModel,
+ BlockDataID fillFieldID, ConstBlockDataID flagFieldID,
+ ConstBlockDataID pdfFieldID, const FlagInfo< FlagField_T >& flagInfo)
+ : ExcessMassDistributionSweepBase_T(excessMassDistributionModel, fillFieldID, flagFieldID, pdfFieldID, flagInfo)
+ {}
+
+ ~ExcessMassDistributionSweepInterfaceEvenly() override = default;
+
+ void operator()(IBlock* const block) override;
+
+ private:
+ template< typename PdfField_T >
+ void distributeMassEvenly(ScalarField_T* fillField, const FlagField_T* flagField, const PdfField_T* pdfField,
+ const Cell& cell, real_t excessFill);
+}; // class ExcessMassDistributionSweepInterfaceEvenly
+
+/***********************************************************************************************************************
+ * Distribute the excess mass weighted with the direction of the interface normal among either
+ * - all neighboring interface cells (see section 4.3 in dissertation of N. Thuerey, 2007)
+ * - newly converted interface cells
+ * - old, i.e., non-newly converted interface cells
+ *
+ * If either no newly converted interface cell or old interface cell is available in the neighborhood, the
+ * respective other approach is used as fallback.
+ **********************************************************************************************************************/
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+class ExcessMassDistributionSweepInterfaceWeighted
+ : public ExcessMassDistributionSweepBase< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >
+{
+ public:
+ using ExcessMassDistributionSweepBase_T =
+ ExcessMassDistributionSweepBase< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >;
+
+ ExcessMassDistributionSweepInterfaceWeighted(const ExcessMassDistributionModel& excessMassDistributionModel,
+ BlockDataID fillFieldID, ConstBlockDataID flagFieldID,
+ ConstBlockDataID pdfFieldID, const FlagInfo< FlagField_T >& flagInfo,
+ ConstBlockDataID normalFieldID)
+ : ExcessMassDistributionSweepBase_T(excessMassDistributionModel, fillFieldID, flagFieldID, pdfFieldID, flagInfo),
+ normalFieldID_(normalFieldID)
+ {}
+
+ ~ExcessMassDistributionSweepInterfaceWeighted() override = default;
+
+ void operator()(IBlock* const block) override;
+
+ private:
+ template< typename PdfField_T >
+ void distributeMassWeighted(ScalarField_T* fillField, const FlagField_T* flagField, const PdfField_T* pdfField,
+ const VectorField_T* normalField, const Cell& cell, bool isNewLiquid, real_t excessFill);
+
+ /********************************************************************************************************************
+ * Returns vector with weights for excess mass distribution among neighboring cells.
+ *******************************************************************************************************************/
+ void getExcessMassWeights(const FlagField_T* flagField, const VectorField_T* normalField, const Cell& cell,
+ bool isNewLiquid, bool useWeightedOld, bool useWeightedAll, bool useWeightedNew,
+ std::vector< real_t >& weights);
+
+ /********************************************************************************************************************
+ * Computes the weights for distributing the excess mass based on the direction of the interface normal (see equation
+ * (4.9) in dissertation of N. Thuerey, 2007)
+ *******************************************************************************************************************/
+ void computeWeightWithNormal(real_t n_dot_ci, bool isNewLiquid, typename LatticeModel_T::Stencil::iterator dir,
+ std::vector< real_t >& weights);
+
+ ConstBlockDataID normalFieldID_;
+
+}; // class ExcessMassDistributionSweepInterfaceWeighted
+
+/***********************************************************************************************************************
+ * Distribute the excess mass evenly among
+ * - all neighboring liquid and interface cells (see p. 47 in master thesis of M. Lehmann, 2019)
+ * - all neighboring interface cells and only to liquid cells if there exists no neighboring interface cell
+ *
+ * Neither the fill level, nor the density of liquid cells is modified. Instead, the excess mass is stored in an
+ * additional field.
+ **********************************************************************************************************************/
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+class ExcessMassDistributionSweepInterfaceAndLiquid
+ : public ExcessMassDistributionSweepBase< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >
+{
+ public:
+ using ExcessMassDistributionSweepBase_T =
+ ExcessMassDistributionSweepBase< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >;
+
+ ExcessMassDistributionSweepInterfaceAndLiquid(const ExcessMassDistributionModel& excessMassDistributionModel,
+ BlockDataID fillFieldID, ConstBlockDataID flagFieldID,
+ ConstBlockDataID pdfFieldID, const FlagInfo< FlagField_T >& flagInfo,
+ BlockDataID excessMassFieldID)
+ : ExcessMassDistributionSweepBase_T(excessMassDistributionModel, fillFieldID, flagFieldID, pdfFieldID, flagInfo),
+ excessMassFieldID_(excessMassFieldID), excessMassFieldClone_(excessMassFieldID)
+ {}
+
+ ~ExcessMassDistributionSweepInterfaceAndLiquid() override = default;
+
+ void operator()(IBlock* const block) override;
+
+ private:
+ template< typename PdfField_T >
+ void distributeMassInterfaceAndLiquid(ScalarField_T* fillField, ScalarField_T* dstExcessMassField,
+ const FlagField_T* flagField, const PdfField_T* pdfField, const Cell& cell,
+ real_t excessMass);
+
+ BlockDataID excessMassFieldID_;
+ field::FieldClone< ScalarField_T, true > excessMassFieldClone_;
+
+}; // class ExcessMassDistributionSweepInterfaceAndLiquid
+
+} // namespace free_surface
+} // namespace walberla
+
+#include "ExcessMassDistributionSweep.impl.h"
\ No newline at end of file
diff --git a/src/lbm/free_surface/dynamics/ExcessMassDistributionSweep.impl.h b/src/lbm/free_surface/dynamics/ExcessMassDistributionSweep.impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..ba30c8445d19276136859641d97673fc8faff98c
--- /dev/null
+++ b/src/lbm/free_surface/dynamics/ExcessMassDistributionSweep.impl.h
@@ -0,0 +1,594 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file ExcessMassDistributionSweep.impl.h
+//! \ingroup dynamics
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Distribute excess mass, i.e., mass that is undistributed after conversions from interface to liquid or gas.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/logging/Logging.h"
+
+#include "domain_decomposition/BlockDataID.h"
+
+#include "field/FlagField.h"
+#include "field/GhostLayerField.h"
+
+#include "lbm/field/PdfField.h"
+#include "lbm/free_surface/FlagInfo.h"
+
+#include "ExcessMassDistributionSweep.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+void ExcessMassDistributionSweepInterfaceEvenly< LatticeModel_T, FlagField_T, ScalarField_T,
+ VectorField_T >::operator()(IBlock* const block)
+{
+ using Base_T = ExcessMassDistributionSweepBase_T;
+
+ const FlagField_T* const flagField = block->getData< const FlagField_T >(Base_T::flagFieldID_);
+ ScalarField_T* const fillField = block->getData< ScalarField_T >(Base_T::fillFieldID_);
+ const lbm::PdfField< LatticeModel_T >* const pdfField =
+ block->getData< const lbm::PdfField< LatticeModel_T > >(Base_T::pdfFieldID_);
+
+ // disable OpenMP to avoid mass distribution to neighboring cells before they have distributed their excess mass
+ WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ_OMP(fillField, uint_c(1), omp critical, {
+ const Cell cell(x, y, z);
+
+ if (flagField->isFlagSet(cell, Base_T::flagInfo_.convertedFlag))
+ {
+ // identify cells that were converted to gas/liquid in this time step
+ const bool newGas = flagField->isMaskSet(cell, Base_T::flagInfo_.convertedFlag | Base_T::flagInfo_.gasFlag);
+ const bool newLiquid =
+ flagField->isMaskSet(cell, Base_T::flagInfo_.convertedFlag | Base_T::flagInfo_.liquidFlag);
+
+ if (newGas || newLiquid)
+ {
+ // a cell can not be converted to both gas and liquid
+ WALBERLA_ASSERT(!(newGas && newLiquid));
+
+ // calculate excess fill level
+ const real_t excessFill = newGas ? fillField->get(cell) : (fillField->get(cell) - real_c(1.0));
+
+ distributeMassEvenly(fillField, flagField, pdfField, cell, excessFill);
+
+ if (newGas) { fillField->get(cell) = real_c(0.0); }
+ else { fillField->get(cell) = real_c(1.0); }
+ }
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+void ExcessMassDistributionSweepBase< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >::
+ getNumberOfEvenlyLiquidAndAllInterfacePreferInterfaceNeighbors(const FlagField_T* flagField, const Cell& cell,
+ uint_t& liquidNeighbors, uint_t& interfaceNeighbors)
+{
+ interfaceNeighbors = uint_c(0);
+ liquidNeighbors = uint_c(0);
+
+ for (auto d = LatticeModel_T::Stencil::beginNoCenter(); d != LatticeModel_T::Stencil::end(); ++d)
+ {
+ const Cell neighborCell = Cell(cell.x() + d.cx(), cell.y() + d.cy(), cell.z() + d.cz());
+ auto neighborFlags = flagField->get(neighborCell);
+
+ if (isFlagSet(neighborFlags, flagInfo_.interfaceFlag)) { ++interfaceNeighbors; }
+ else
+ {
+ if (isFlagSet(neighborFlags, flagInfo_.liquidFlag)) { ++liquidNeighbors; }
+ }
+ }
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+void ExcessMassDistributionSweepBase< LatticeModel_T, FlagField_T, ScalarField_T,
+ VectorField_T >::getNumberOfInterfaceNeighbors(const FlagField_T* flagField,
+ const Cell& cell,
+ uint_t& newInterfaceNeighbors,
+ uint_t& interfaceNeighbors)
+{
+ interfaceNeighbors = uint_c(0);
+ newInterfaceNeighbors = uint_c(0);
+
+ for (auto d = LatticeModel_T::Stencil::beginNoCenter(); d != LatticeModel_T::Stencil::end(); ++d)
+ {
+ const Cell neighborCell = Cell(cell.x() + d.cx(), cell.y() + d.cy(), cell.z() + d.cz());
+ auto neighborFlags = flagField->get(neighborCell);
+
+ if (isFlagSet(neighborFlags, flagInfo_.interfaceFlag))
+ {
+ ++interfaceNeighbors;
+ if (isFlagSet(neighborFlags, flagInfo_.convertedFlag)) { ++newInterfaceNeighbors; }
+ }
+ }
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+template< typename PdfField_T >
+void ExcessMassDistributionSweepInterfaceEvenly< LatticeModel_T, FlagField_T, ScalarField_T,
+ VectorField_T >::distributeMassEvenly(ScalarField_T* fillField,
+ const FlagField_T* flagField,
+ const PdfField_T* pdfField,
+ const Cell& cell,
+ real_t excessFill)
+{
+ using Base_T = ExcessMassDistributionSweepBase_T;
+
+ bool useEvenlyAll = Base_T::excessMassDistributionModel_.getModelType() ==
+ ExcessMassDistributionModel::ExcessMassModel::EvenlyAllInterface;
+ bool useEvenlyNew = Base_T::excessMassDistributionModel_.getModelType() ==
+ ExcessMassDistributionModel::ExcessMassModel::EvenlyNewInterface;
+ bool useEvenlyOld = Base_T::excessMassDistributionModel_.getModelType() ==
+ ExcessMassDistributionModel::ExcessMassModel::EvenlyOldInterface;
+
+ // get number of interface neighbors
+ uint_t newInterfaceNeighbors = uint_c(0);
+ uint_t interfaceNeighbors = uint_c(0);
+ Base_T::getNumberOfInterfaceNeighbors(flagField, cell, newInterfaceNeighbors, interfaceNeighbors);
+ const uint_t oldInterfaceNeighbors = interfaceNeighbors - newInterfaceNeighbors;
+
+ if (interfaceNeighbors == uint_c(0))
+ {
+ WALBERLA_LOG_WARNING("No interface cell is in the neighborhood to distribute excess mass to. Mass is lost.");
+ return;
+ }
+
+ // get density of the current cell
+ const real_t density = pdfField->getDensity(cell);
+
+ // compute mass to be distributed to neighboring cells
+ real_t deltaMass = real_c(0);
+ if ((useEvenlyOld && oldInterfaceNeighbors > uint_c(0)) || newInterfaceNeighbors == uint_c(0))
+ {
+ useEvenlyOld = true;
+ useEvenlyAll = false;
+ useEvenlyNew = false;
+
+ deltaMass = excessFill / real_c(oldInterfaceNeighbors) * density;
+ }
+ else
+ {
+ if (useEvenlyNew || oldInterfaceNeighbors == uint_c(0))
+ {
+ useEvenlyOld = false;
+ useEvenlyAll = false;
+ useEvenlyNew = true;
+
+ deltaMass = excessFill / real_c(newInterfaceNeighbors) * density;
+ }
+ else
+ {
+ useEvenlyOld = false;
+ useEvenlyAll = true;
+ useEvenlyNew = false;
+
+ deltaMass = excessFill / real_c(interfaceNeighbors) * density;
+ }
+ }
+
+ // distribute the excess mass
+ for (auto pushDir = LatticeModel_T::Stencil::beginNoCenter(); pushDir != LatticeModel_T::Stencil::end(); ++pushDir)
+ {
+ const Cell neighborCell = Cell(cell.x() + pushDir.cx(), cell.y() + pushDir.cy(), cell.z() + pushDir.cz());
+
+ // do not push mass in the direction of the second ghost layer
+ // - inner domain: 0 to *Size()-1
+ // - inner domain incl. first ghost layer: -1 to *Size()
+ if (neighborCell.x() < cell_idx_c(-1) || neighborCell.y() < cell_idx_c(-1) || neighborCell.z() < cell_idx_c(-1) ||
+ neighborCell.x() > cell_idx_c(fillField->xSize()) || neighborCell.y() > cell_idx_c(fillField->ySize()) ||
+ neighborCell.z() > cell_idx_c(fillField->zSize()))
+ {
+ continue;
+ }
+
+ // only push mass to neighboring interface cells
+ if (flagField->isFlagSet(neighborCell, Base_T::flagInfo_.interfaceFlag))
+ {
+ // get density of neighboring interface cell
+ const real_t neighborDensity = pdfField->getDensity(neighborCell);
+
+ if (flagField->isFlagSet(neighborCell, Base_T::flagInfo_.convertedFlag) && (useEvenlyAll || useEvenlyNew))
+ {
+ // push mass to newly converted interface cell
+ fillField->get(neighborCell) += deltaMass / neighborDensity;
+ }
+ else
+ {
+ if (!flagField->isFlagSet(neighborCell, Base_T::flagInfo_.convertedFlag) && (useEvenlyOld || useEvenlyAll))
+ {
+ // push mass to old, i.e., non-newly converted interface cells
+ fillField->getNeighbor(cell, *pushDir) += deltaMass / neighborDensity;
+ }
+ }
+ }
+ }
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+void ExcessMassDistributionSweepInterfaceWeighted< LatticeModel_T, FlagField_T, ScalarField_T,
+ VectorField_T >::operator()(IBlock* const block)
+{
+ using Base_T = ExcessMassDistributionSweepBase_T;
+
+ const FlagField_T* const flagField = block->getData< const FlagField_T >(Base_T::flagFieldID_);
+ ScalarField_T* const fillField = block->getData< ScalarField_T >(Base_T::fillFieldID_);
+ const lbm::PdfField< LatticeModel_T >* const pdfField =
+ block->getData< const lbm::PdfField< LatticeModel_T > >(Base_T::pdfFieldID_);
+ const VectorField_T* const normalField = block->getData< const VectorField_T >(normalFieldID_);
+
+ // disable OpenMP to avoid mass distribution to neighboring cells before they have distributed their excess mass
+ WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ_OMP(fillField, uint_c(1), omp critical, {
+ const Cell cell(x, y, z);
+
+ if (flagField->isFlagSet(cell, Base_T::flagInfo_.convertedFlag))
+ {
+ // identify cells that were converted to gas/liquid in this time step
+ const bool newGas = flagField->isMaskSet(cell, Base_T::flagInfo_.convertedFlag | Base_T::flagInfo_.gasFlag);
+ const bool newLiquid =
+ flagField->isMaskSet(cell, Base_T::flagInfo_.convertedFlag | Base_T::flagInfo_.liquidFlag);
+
+ if (newGas || newLiquid)
+ {
+ // a cell can not be converted to both gas and liquid
+ WALBERLA_ASSERT(!(newGas && newLiquid));
+
+ // calculate excess fill level
+ const real_t excessFill = newGas ? fillField->get(cell) : (fillField->get(cell) - real_c(1.0));
+
+ distributeMassWeighted(fillField, flagField, pdfField, normalField, cell, newLiquid, excessFill);
+
+ if (newGas) { fillField->get(cell) = real_c(0.0); }
+ else { fillField->get(cell) = real_c(1.0); }
+ }
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+template< typename PdfField_T >
+void ExcessMassDistributionSweepInterfaceWeighted< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >::
+ distributeMassWeighted(ScalarField_T* fillField, const FlagField_T* flagField, const PdfField_T* pdfField,
+ const VectorField_T* normalField, const Cell& cell, bool isNewLiquid, real_t excessFill)
+{
+ using Base_T = ExcessMassDistributionSweepBase_T;
+
+ bool useWeightedAll = Base_T::excessMassDistributionModel_.getModelType() ==
+ ExcessMassDistributionModel::ExcessMassModel::WeightedAllInterface;
+ bool useWeightedNew = Base_T::excessMassDistributionModel_.getModelType() ==
+ ExcessMassDistributionModel::ExcessMassModel::WeightedNewInterface;
+ bool useWeightedOld = Base_T::excessMassDistributionModel_.getModelType() ==
+ ExcessMassDistributionModel::ExcessMassModel::WeightedOldInterface;
+
+ // get number of interface neighbors
+ uint_t newInterfaceNeighbors = uint_c(0);
+ uint_t interfaceNeighbors = uint_c(0);
+ Base_T::getNumberOfInterfaceNeighbors(flagField, cell, newInterfaceNeighbors, interfaceNeighbors);
+ const uint_t oldInterfaceNeighbors = interfaceNeighbors - newInterfaceNeighbors;
+
+ if (interfaceNeighbors == uint_c(0))
+ {
+ WALBERLA_LOG_WARNING("No interface cell is in the neighborhood to distribute excess mass to. Mass is lost.");
+ return;
+ }
+
+ // check applicability of the chosen model
+ if ((useWeightedOld && oldInterfaceNeighbors > uint_c(0)) || newInterfaceNeighbors == uint_c(0))
+ {
+ useWeightedOld = true;
+ useWeightedAll = false;
+ useWeightedNew = false;
+ }
+ else
+ {
+ if (useWeightedNew || oldInterfaceNeighbors == uint_c(0))
+ {
+ useWeightedOld = false;
+ useWeightedAll = false;
+ useWeightedNew = true;
+ }
+ else
+ {
+ useWeightedOld = false;
+ useWeightedAll = true;
+ useWeightedNew = false;
+ }
+ }
+
+ // get normal-direction-based weights of the excess mass
+ std::vector< real_t > weights(LatticeModel_T::Stencil::Size, real_c(0));
+ getExcessMassWeights(flagField, normalField, cell, isNewLiquid, useWeightedOld, useWeightedAll, useWeightedNew,
+ weights);
+
+ // get the sum of all weights
+ real_t weightSum = real_c(0);
+ for (const auto& w : weights)
+ {
+ weightSum += w;
+ }
+
+ // if there are either no old or no newly converted interface cells in normal direction, distribute mass to whatever
+ // interface cell is available in normal direction
+ if (realIsEqual(weightSum, real_c(0), real_c(1e-14)) && (useWeightedOld || useWeightedNew))
+ {
+ useWeightedOld = false;
+ useWeightedAll = true;
+ useWeightedNew = false;
+
+ // recompute mass weights since other type of interface cells are now considered also
+ getExcessMassWeights(flagField, normalField, cell, isNewLiquid, useWeightedOld, useWeightedAll, useWeightedNew,
+ weights);
+
+ // update sum of all weights
+ for (const auto& w : weights)
+ {
+ weightSum += w;
+ }
+
+ // if no interface cell is available in normal direction, distribute mass evenly to all neighboring interface
+ // cells
+ if (realIsEqual(weightSum, real_c(0), real_c(1e-14)))
+ {
+ WALBERLA_LOG_WARNING_ON_ROOT(
+ "Excess mass can not be distributed with a weighted approach since no interface cell is available in "
+ "normal direction. Distributing excess mass evenly among all surrounding interface cells.");
+
+ // manually set weights to 1 to get equal weight in any direction
+ for (auto& w : weights)
+ {
+ w = real_c(1);
+ }
+
+ // weight sum is now the number of neighboring interface cells
+ weightSum = real_c(interfaceNeighbors);
+ }
+ }
+
+ WALBERLA_ASSERT_GREATER(
+ weightSum, real_c(0),
+ "Sum of all weights is zero in ExcessMassDistribution. This means that no neighboring interface cell is "
+ "available for distributing the excess mass to. This error should have been caught earlier.");
+
+ const real_t excessMass = excessFill * pdfField->getDensity(cell);
+
+ // distribute the excess mass
+ for (auto pushDir = LatticeModel_T::Stencil::beginNoCenter(); pushDir != LatticeModel_T::Stencil::end(); ++pushDir)
+ {
+ const Cell neighborCell = Cell(cell.x() + pushDir.cx(), cell.y() + pushDir.cy(), cell.z() + pushDir.cz());
+
+ // do not push mass in the direction of the second ghost layer
+ // - inner domain: 0 to *Size()-1
+ // - inner domain incl. first ghost layer: -1 to *Size()
+ if (neighborCell.x() < cell_idx_c(-1) || neighborCell.y() < cell_idx_c(-1) || neighborCell.z() < cell_idx_c(-1) ||
+ neighborCell.x() > cell_idx_c(fillField->xSize()) || neighborCell.y() > cell_idx_c(fillField->ySize()) ||
+ neighborCell.z() > cell_idx_c(fillField->zSize()))
+ {
+ continue;
+ }
+
+ // only push mass to neighboring interface cells
+ if (flagField->isFlagSet(neighborCell, Base_T::flagInfo_.interfaceFlag))
+ {
+ // get density of neighboring interface cell
+ const real_t neighborDensity = pdfField->getDensity(neighborCell);
+
+ if (flagField->isFlagSet(neighborCell, Base_T::flagInfo_.convertedFlag) && (useWeightedAll || useWeightedNew))
+ {
+ // push mass to newly converted interface cell
+ const real_t deltaMass = excessMass * weights[pushDir.toIdx()] / weightSum;
+ fillField->get(neighborCell) += deltaMass / neighborDensity;
+ }
+ else
+ {
+ if (!flagField->isFlagSet(neighborCell, Base_T::flagInfo_.convertedFlag) &&
+ (useWeightedOld || useWeightedAll))
+ {
+ // push mass to old, i.e., non-newly converted interface cells
+ const real_t deltaMass = excessMass * weights[pushDir.toIdx()] / weightSum;
+ fillField->getNeighbor(cell, *pushDir) += deltaMass / neighborDensity;
+ }
+ }
+ }
+ }
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+void ExcessMassDistributionSweepInterfaceWeighted< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >::
+ getExcessMassWeights(const FlagField_T* flagField, const VectorField_T* normalField, const Cell& cell,
+ bool isNewLiquid, bool useWeightedOld, bool useWeightedAll, bool useWeightedNew,
+ std::vector< real_t >& weights)
+{
+ using Base_T = ExcessMassDistributionSweepBase_T;
+
+ // iterate all neighboring cells
+ for (auto d = LatticeModel_T::Stencil::beginNoCenter(); d != LatticeModel_T::Stencil::end(); ++d)
+ {
+ const Cell neighborCell = Cell(cell.x() + d.cx(), cell.y() + d.cy(), cell.z() + d.cz());
+ auto neighborFlags = flagField->get(neighborCell);
+
+ if (isFlagSet(neighborFlags, Base_T::flagInfo_.interfaceFlag))
+ {
+ // compute dot product of normal direction and lattice direction to neighboring cell
+ const real_t n_dot_ci =
+ normalField->get(cell) * Vector3< real_t >(real_c(d.cx()), real_c(d.cy()), real_c(d.cz()));
+
+ if (useWeightedAll || (useWeightedOld && !isFlagSet(neighborFlags, Base_T::flagInfo_.convertedFlag)))
+ {
+ computeWeightWithNormal(n_dot_ci, isNewLiquid, d, weights);
+ }
+ else
+ {
+ if (useWeightedNew && isFlagSet(neighborFlags, Base_T::flagInfo_.convertedFlag))
+ {
+ computeWeightWithNormal(n_dot_ci, isNewLiquid, d, weights);
+ }
+ else { weights[d.toIdx()] = real_c(0); }
+ }
+ }
+ else
+ {
+ // no interface cell in this direction, weight is zero
+ weights[d.toIdx()] = real_c(0);
+ }
+ }
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+void ExcessMassDistributionSweepInterfaceWeighted< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >::
+ computeWeightWithNormal(real_t n_dot_ci, bool isNewLiquid, typename LatticeModel_T::Stencil::iterator dir,
+ std::vector< real_t >& weights)
+{
+ // dissertation of N. Thuerey, 2007, equation (4.9)
+ if (isNewLiquid)
+ {
+ if (n_dot_ci > real_c(0)) { weights[dir.toIdx()] = n_dot_ci; }
+ else { weights[dir.toIdx()] = real_c(0); }
+ }
+ else // cell was converted from interface to gas
+ {
+ if (n_dot_ci < real_c(0)) { weights[dir.toIdx()] = -n_dot_ci; }
+ else { weights[dir.toIdx()] = real_c(0); }
+ }
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+void ExcessMassDistributionSweepInterfaceAndLiquid< LatticeModel_T, FlagField_T, ScalarField_T,
+ VectorField_T >::operator()(IBlock* const block)
+{
+ using Base_T = ExcessMassDistributionSweepBase_T;
+
+ const FlagField_T* const flagField = block->getData< const FlagField_T >(Base_T::flagFieldID_);
+ ScalarField_T* const fillField = block->getData< ScalarField_T >(Base_T::fillFieldID_);
+ const lbm::PdfField< LatticeModel_T >* const pdfField =
+ block->getData< const lbm::PdfField< LatticeModel_T > >(Base_T::pdfFieldID_);
+
+ ScalarField_T* const srcExcessMassField = block->getData< ScalarField_T >(excessMassFieldID_);
+ ScalarField_T* const dstExcessMassField = excessMassFieldClone_.get(block);
+
+ WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ(dstExcessMassField, uint_c(1), {
+ dstExcessMassField->get(x, y, z) = real_c(0);
+ }) // WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ
+
+ // disable OpenMP to avoid mass distribution to neighboring cells before they have distributed their excess mass
+ WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ_OMP(fillField, uint_c(1), omp critical, {
+ const Cell cell(x, y, z);
+
+ if (flagField->isFlagSet(cell, Base_T::flagInfo_.convertedFlag))
+ {
+ // identify cells that were converted to gas/liquid in this time step
+ const bool newGas = flagField->isMaskSet(cell, Base_T::flagInfo_.convertedFlag | Base_T::flagInfo_.gasFlag);
+ const bool newLiquid =
+ flagField->isMaskSet(cell, Base_T::flagInfo_.convertedFlag | Base_T::flagInfo_.liquidFlag);
+
+ if (newGas || newLiquid)
+ {
+ // a cell can not be converted to both gas and liquid
+ WALBERLA_ASSERT(!(newGas && newLiquid));
+
+ // calculate excess fill level
+ const real_t excessFill = newGas ? fillField->get(cell) : (fillField->get(cell) - real_c(1.0));
+
+ // store excess mass such that it can be distributed below
+ srcExcessMassField->get(cell) = excessFill * pdfField->getDensity(cell);
+
+ if (newGas) { fillField->get(cell) = real_c(0.0); }
+ else { fillField->get(cell) = real_c(1.0); }
+ }
+ }
+
+ if (!realIsEqual(srcExcessMassField->get(cell), real_c(0), real_c(1e-14)))
+ {
+ distributeMassInterfaceAndLiquid(fillField, dstExcessMassField, flagField, pdfField, cell,
+ srcExcessMassField->get(cell));
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ
+
+ srcExcessMassField->swapDataPointers(dstExcessMassField);
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+template< typename PdfField_T >
+void ExcessMassDistributionSweepInterfaceAndLiquid< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >::
+ distributeMassInterfaceAndLiquid(ScalarField_T* fillField, ScalarField_T* dstExcessMassField,
+ const FlagField_T* flagField, const PdfField_T* pdfField, const Cell& cell,
+ real_t excessMass)
+{
+ using Base_T = ExcessMassDistributionSweepBase_T;
+
+ // get number of liquid and interface neighbors
+ uint_t liquidNeighbors = uint_c(0);
+ uint_t interfaceNeighbors = uint_c(0);
+ Base_T::getNumberOfEvenlyLiquidAndAllInterfacePreferInterfaceNeighbors(flagField, cell, liquidNeighbors,
+ interfaceNeighbors);
+ const uint_t EvenlyLiquidAndAllInterfacePreferInterfaceNeighbors = liquidNeighbors + interfaceNeighbors;
+
+ if (EvenlyLiquidAndAllInterfacePreferInterfaceNeighbors == uint_c(0))
+ {
+ WALBERLA_LOG_WARNING(
+ "No liquid or interface cell is in the neighborhood to distribute excess mass to. Mass is lost.");
+ return;
+ }
+
+ const bool preferInterface =
+ Base_T::excessMassDistributionModel_.getModelType() ==
+ ExcessMassDistributionModel::ExcessMassModel::EvenlyLiquidAndAllInterfacePreferInterface &&
+ interfaceNeighbors > uint_c(0);
+
+ // compute mass to be distributed to neighboring cells
+ real_t deltaMass;
+ if (preferInterface) { deltaMass = excessMass / real_c(interfaceNeighbors); }
+ else { deltaMass = excessMass / real_c(EvenlyLiquidAndAllInterfacePreferInterfaceNeighbors); }
+
+ // distribute the excess mass
+ for (auto pushDir = LatticeModel_T::Stencil::beginNoCenter(); pushDir != LatticeModel_T::Stencil::end(); ++pushDir)
+ {
+ const Cell neighborCell = Cell(cell.x() + pushDir.cx(), cell.y() + pushDir.cy(), cell.z() + pushDir.cz());
+
+ // do not push mass to cells in the ghost layer (done by the process from which the ghost layer is synchronized)
+ // - inner domain: 0 to *Size()-1
+ // - inner domain incl. first ghost layer: -1 to *Size()
+ if (neighborCell.x() <= cell_idx_c(-1) || neighborCell.y() <= cell_idx_c(-1) ||
+ neighborCell.z() <= cell_idx_c(-1) || neighborCell.x() >= cell_idx_c(fillField->xSize()) ||
+ neighborCell.y() >= cell_idx_c(fillField->ySize()) || neighborCell.z() >= cell_idx_c(fillField->zSize()))
+ {
+ continue;
+ }
+
+ if (flagField->isFlagSet(neighborCell, Base_T::flagInfo_.interfaceFlag))
+ {
+ // get density of neighboring interface cell
+ const real_t neighborDensity = pdfField->getDensity(neighborCell);
+
+ // add excess mass directly to fill level for neighboring interface cells
+ fillField->get(neighborCell) += deltaMass / neighborDensity;
+ }
+ else
+ {
+ if (flagField->isFlagSet(neighborCell, Base_T::flagInfo_.liquidFlag) && !preferInterface)
+ {
+ // add excess mass to excessMassField for neighboring liquid cells
+ dstExcessMassField->get(neighborCell) += deltaMass;
+ }
+ }
+ }
+}
+
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/dynamics/ForceWeightingSweep.h b/src/lbm/free_surface/dynamics/ForceWeightingSweep.h
new file mode 100644
index 0000000000000000000000000000000000000000..4a13fb3b41dd7cce966776acd4db6f79a10788c7
--- /dev/null
+++ b/src/lbm/free_surface/dynamics/ForceWeightingSweep.h
@@ -0,0 +1,96 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file ForceWeightingSweep.h
+//! \ingroup dynamics
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Weight force in interface cells with fill level and density (equation 15 in Koerner et al., 2005).
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/logging/Logging.h"
+
+#include "domain_decomposition/BlockDataID.h"
+
+#include "field/FlagField.h"
+#include "field/GhostLayerField.h"
+
+#include "lbm/field/PdfField.h"
+#include "lbm/free_surface/FlagInfo.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Weight the specified force in interface cells according to their density and fill level, as in equation 15 in Koerner
+ * et al., 2005.
+ * In liquid cells, the force is set to the specified constant global force.
+ **********************************************************************************************************************/
+template< typename LatticeModel_T, typename FlagField_T, typename VectorField_T, typename ScalarField_T >
+class ForceWeightingSweep
+{
+ public:
+ ForceWeightingSweep(BlockDataID forceFieldID, ConstBlockDataID pdfFieldID, ConstBlockDataID flagFieldID,
+ ConstBlockDataID fillFieldID, const FlagInfo< FlagField_T >& flagInfo,
+ const Vector3< real_t >& globalForce)
+ : forceFieldID_(forceFieldID), pdfFieldID_(pdfFieldID), flagFieldID_(flagFieldID), fillFieldID_(fillFieldID),
+ flagInfo_(flagInfo), globalForce_(globalForce)
+ {}
+
+ void operator()(IBlock* const block)
+ {
+ using PdfField_T = lbm::PdfField< LatticeModel_T >;
+
+ VectorField_T* const forceField = block->getData< VectorField_T >(forceFieldID_);
+ const PdfField_T* const pdfField = block->getData< const PdfField_T >(pdfFieldID_);
+ const FlagField_T* const flagField = block->getData< const FlagField_T >(flagFieldID_);
+ const ScalarField_T* const fillField = block->getData< const ScalarField_T >(fillFieldID_);
+
+ WALBERLA_FOR_ALL_CELLS(forceFieldIt, forceField, pdfFieldIt, pdfField, flagFieldIt, flagField, fillFieldIt,
+ fillField, {
+ flag_t flag = *flagFieldIt;
+
+ // set force in interface cells to globalForce_ * density * fillLevel (see equation 15
+ // in Koerner et al., 2005)
+ if (flagInfo_.isInterface(flag))
+ {
+ const real_t density = pdfField->getDensity(pdfFieldIt.cell());
+ const real_t fillLevel = *fillFieldIt;
+ *forceFieldIt = globalForce_ * fillLevel * density;
+ }
+ else
+ {
+ // set force to globalForce_ in all non-interface cells
+ *forceFieldIt = globalForce_;
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ private:
+ using flag_t = typename FlagField_T::flag_t;
+
+ BlockDataID forceFieldID_;
+ ConstBlockDataID pdfFieldID_;
+ ConstBlockDataID flagFieldID_;
+ ConstBlockDataID fillFieldID_;
+ FlagInfo< FlagField_T > flagInfo_;
+ Vector3< real_t > globalForce_;
+}; // class ForceWeightingSweep
+
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/dynamics/PdfReconstructionModel.h b/src/lbm/free_surface/dynamics/PdfReconstructionModel.h
new file mode 100644
index 0000000000000000000000000000000000000000..9468f06b33e271ee6e014722e333bb9e5125c363
--- /dev/null
+++ b/src/lbm/free_surface/dynamics/PdfReconstructionModel.h
@@ -0,0 +1,173 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file PdfReconstructionModel.h
+//! \ingroup dynamics
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Class that specifies the number of reconstructed PDFs at the free surface interface.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/StringUtility.h"
+#include "core/stringToNum.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Class that specifies the number of reconstructed PDFs at the free surface interface. PDFs need to be reconstructed
+ * as they might be missing, i.e., PDFs streaming from gas to interface are not available inherently.
+ *
+ * Available models:
+ * - NormalBasedKeepCenter: reconstruct all PDFs for which n * c_i >= 0 (approach by Koerner et al., 2005); some
+ * already available PDFs will be overwritten
+ *
+ * - NormalBasedReconstructCenter: reconstruct all PDFs for which n * c_i >= 0 (including the center PDF); some already
+ * available PDFs coming from liquid will be overwritten
+ *
+ * - OnlyMissing: reconstruct only missing PDFs (no already available PDF gets overwritten)
+ *
+ * - All: reconstruct all PDFs (any already available PDF is overwritten)
+ *
+ * - OnlyMissingMin-N-largest: Reconstruct only missing PDFs but at least N (and therefore potentially overwrite
+ * available PDFs); "smallest" or "largest" specifies whether PDFs with smallest or largest
+ * n * c_i get overwritten first. This model is motivated by the dissertation of Simon
+ * Bogner, 2017, section 4.2.1, where it is argued that at least 3 PDFs must be
+ * reconstructed, as otherwise the free surface boundary condition is claimed to be
+ * underdetermined. However, a mathematical proof for this statement is not given.
+ *
+ * - OnlyMissingMin-N-smallest: see comment at "OnlyMissingMin-N-largest"
+ *
+ * - OnlyMissingMin-N-normalBasedKeepCenter: see comment at "OnlyMissingMin-N-largest"; if less than N PDFs are unknown,
+ * reconstruct according to the model "NormalBasedKeepCenter"
+ * ********************************************************************************************************************/
+class PdfReconstructionModel
+{
+ public:
+ enum class ReconstructionModel {
+ NormalBasedReconstructCenter,
+ NormalBasedKeepCenter,
+ OnlyMissing,
+ All,
+ OnlyMissingMin,
+ };
+
+ enum class FallbackModel {
+ Largest,
+ Smallest,
+ NormalBasedKeepCenter,
+ };
+
+ PdfReconstructionModel(const std::string& modelName) : modelName_(modelName), modelType_(chooseType(modelName))
+ {
+ if (modelType_ == ReconstructionModel::OnlyMissingMin)
+ {
+ const std::vector< std::string > substrings = string_split(modelName, "-");
+
+ modelName_ = substrings[0]; // "OnlyMissingMin"
+ numMinReconstruct_ = stringToNum< uint_t >(substrings[1]); // N
+ fallbackModelName_ = substrings[2]; // "smallest" or "largest" or "normalBasedKeepCenter"
+ fallbackModel_ = chooseFallbackModel(fallbackModelName_);
+
+ if (fallbackModel_ != FallbackModel::Largest && fallbackModel_ != FallbackModel::Smallest &&
+ fallbackModel_ != FallbackModel::NormalBasedKeepCenter)
+ {
+ WALBERLA_ABORT("The specified PDF reconstruction fallback-model " << modelName << " is not available.");
+ }
+ }
+ }
+
+ inline ReconstructionModel getModelType() const { return modelType_; }
+ inline std::string getModelName() const { return modelName_; }
+ inline uint_t getNumMinReconstruct() const { return numMinReconstruct_; }
+ inline FallbackModel getFallbackModel() const { return fallbackModel_; }
+ inline std::string getFallbackModelName() const { return fallbackModelName_; }
+ inline std::string getFullModelSpecification() const
+ {
+ if (modelType_ == ReconstructionModel::OnlyMissingMin)
+ {
+ return modelName_ + "-" + std::to_string(numMinReconstruct_) + "-" + fallbackModelName_;
+ }
+ else { return modelName_; }
+ }
+
+ private:
+ ReconstructionModel chooseType(const std::string& modelName)
+ {
+ if (!string_icompare(modelName, "NormalBasedReconstructCenter"))
+ {
+ return ReconstructionModel::NormalBasedReconstructCenter;
+ }
+
+ else
+ {
+ if (!string_icompare(modelName, "NormalBasedKeepCenter"))
+ {
+ return ReconstructionModel::NormalBasedKeepCenter;
+ }
+ else
+ {
+ if (!string_icompare(modelName, "OnlyMissing")) { return ReconstructionModel::OnlyMissing; }
+ else
+ {
+ if (!string_icompare(modelName, "All")) { return ReconstructionModel::All; }
+ else
+ {
+ if (!string_icompare(string_split(modelName, "-")[0], "OnlyMissingMin"))
+ {
+ return ReconstructionModel::OnlyMissingMin;
+ }
+ else
+ {
+ WALBERLA_ABORT("The specified PDF reconstruction model " << modelName << " is not available.");
+ }
+ }
+ }
+ }
+ }
+ }
+
+ FallbackModel chooseFallbackModel(const std::string& fallbackModelName)
+ {
+ if (!string_icompare(fallbackModelName, "largest")) { return FallbackModel::Largest; }
+ else
+ {
+ if (!string_icompare(fallbackModelName, "smallest")) { return FallbackModel::Smallest; }
+ else
+ {
+ if (!string_icompare(fallbackModelName, "normalBasedKeepCenter"))
+ {
+ return FallbackModel::NormalBasedKeepCenter;
+ }
+ else
+ {
+ WALBERLA_ABORT("The specified PDF reconstruction fallback-model " << fallbackModelName
+ << " is not available.");
+ }
+ }
+ }
+ }
+
+ std::string modelName_;
+ ReconstructionModel modelType_;
+ uint_t numMinReconstruct_;
+ std::string fallbackModelName_;
+ FallbackModel fallbackModel_;
+}; // class PdfReconstructionModel
+} // namespace free_surface
+} // namespace walberla
\ No newline at end of file
diff --git a/src/lbm/free_surface/dynamics/PdfRefillingModel.h b/src/lbm/free_surface/dynamics/PdfRefillingModel.h
new file mode 100644
index 0000000000000000000000000000000000000000..ffd86279ceee8e81b9e6f51e80b4a04dc388ed9a
--- /dev/null
+++ b/src/lbm/free_surface/dynamics/PdfRefillingModel.h
@@ -0,0 +1,147 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file PdfRefillingModel.h
+//! \ingroup dynamics
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \author Michael Zikeli
+//! \brief Defines how cells are refilled (i.e. PDFs reinitialized) after the cell was converted from gas to interface.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/StringUtility.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Class that specifies how PDFs are reinitialized in cells that are converted from gas to interface.
+ *
+ * Available options are:
+ * - EquilibriumRefilling:
+ * initialize PDFs with equilibrium using average density and velocity from neighboring cells; default
+ * approach used in any known publication with free surface LBM
+ *
+ * - AverageRefilling:
+ * initialize PDFs with average PDFs (in the respective directions) of neighboring cells
+ *
+ * - EquilibriumAndNonEquilibriumRefilling:
+ * initialize PDFs with EquilibriumRefilling and add the non-equilibrium contribution of neighboring cells
+ *
+ * - ExtrapolationRefilling:
+ * initialize PDFs with PDFs extrapolated (in surface normal direction) from neighboring cells
+ *
+ * - GradsMomentsRefilling:
+ * initialize PDFs with EquilibriumRefilling and add the contribution of the non-equilibrium pressure
+ * tensor
+ *
+ * See src/lbm/free_surface/dynamics/PdfRefillingSweep.h for a detailed description of the models.
+ *
+ * The models and their implementation are inspired by the equivalent functionality of the lbm-particle coupling, see
+ * src/lbm_mesapd_coupling/momentum_exchange_method/reconstruction/Reconstructor.h.
+ **********************************************************************************************************************/
+class PdfRefillingModel
+{
+ public:
+ enum class RefillingModel {
+ EquilibriumRefilling,
+ AverageRefilling,
+ EquilibriumAndNonEquilibriumRefilling,
+ ExtrapolationRefilling,
+ GradsMomentsRefilling
+ };
+
+ PdfRefillingModel(const std::string& modelName) : modelName_(modelName), modelType_(chooseType(modelName)) {}
+
+ PdfRefillingModel(const RefillingModel& modelType) : modelName_(chooseName(modelType)), modelType_(modelType)
+ {
+ switch (modelType_)
+ {
+ case RefillingModel::EquilibriumRefilling:
+ break;
+ case RefillingModel::AverageRefilling:
+ break;
+ case RefillingModel::EquilibriumAndNonEquilibriumRefilling:
+ break;
+ case RefillingModel::ExtrapolationRefilling:
+ break;
+ case RefillingModel::GradsMomentsRefilling:
+ break;
+ }
+ }
+
+ inline RefillingModel getModelType() const { return modelType_; }
+ inline std::string getModelName() const { return modelName_; }
+ inline std::string getFullModelSpecification() const { return getModelName(); }
+
+ static inline std::initializer_list< const RefillingModel > getTypeIterator() { return listOfAllEnums; }
+
+ private:
+ RefillingModel chooseType(const std::string& modelName)
+ {
+ if (!string_icompare(modelName, "EquilibriumRefilling")) { return RefillingModel::EquilibriumRefilling; }
+
+ if (!string_icompare(modelName, "AverageRefilling")) { return RefillingModel::AverageRefilling; }
+
+ if (!string_icompare(modelName, "EquilibriumAndNonEquilibriumRefilling"))
+ {
+ return RefillingModel::EquilibriumAndNonEquilibriumRefilling;
+ }
+
+ if (!string_icompare(modelName, "ExtrapolationRefilling")) { return RefillingModel::ExtrapolationRefilling; }
+
+ if (!string_icompare(modelName, "GradsMomentsRefilling")) { return RefillingModel::GradsMomentsRefilling; }
+
+ WALBERLA_ABORT("The specified PDF reinitialization model " << modelName << " is not available.");
+ }
+
+ std::string chooseName(RefillingModel const& modelType) const
+ {
+ std::string modelName;
+ switch (modelType)
+ {
+ case RefillingModel::EquilibriumRefilling:
+ modelName = "EquilibriumRefilling";
+ break;
+ case RefillingModel::AverageRefilling:
+ modelName = "AverageRefilling";
+ break;
+ case RefillingModel::EquilibriumAndNonEquilibriumRefilling:
+ modelName = "EquilibriumAndNonEquilibriumRefilling";
+ break;
+ case RefillingModel::ExtrapolationRefilling:
+ modelName = "ExtrapolationRefilling";
+ break;
+ case RefillingModel::GradsMomentsRefilling:
+ modelName = "GradsMomentsRefilling";
+ break;
+ }
+ return modelName;
+ }
+
+ std::string modelName_;
+ RefillingModel modelType_;
+ static constexpr std::initializer_list< const RefillingModel > listOfAllEnums = {
+ RefillingModel::EquilibriumRefilling, RefillingModel::AverageRefilling,
+ RefillingModel::EquilibriumAndNonEquilibriumRefilling, RefillingModel::ExtrapolationRefilling,
+ RefillingModel::GradsMomentsRefilling
+ };
+
+}; // class PdfRefillingModel
+} // namespace free_surface
+} // namespace walberla
\ No newline at end of file
diff --git a/src/lbm/free_surface/dynamics/PdfRefillingSweep.h b/src/lbm/free_surface/dynamics/PdfRefillingSweep.h
new file mode 100644
index 0000000000000000000000000000000000000000..8c1c745130aa0f37bb3fe353dc3251bc44e02801
--- /dev/null
+++ b/src/lbm/free_surface/dynamics/PdfRefillingSweep.h
@@ -0,0 +1,447 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file PdfRefillingSweep.h
+//! \ingroup dynamics
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \author Michael Zikeli
+//! \brief Sweeps for refilling cells (i.e. reinitializing PDFs) after the cell was converted from gas to interface.
+//======================================================================================================================
+
+#pragma once
+
+#include "core/DataTypes.h"
+#include "core/StringUtility.h"
+#include "core/cell/Cell.h"
+#include "core/debug/CheckFunctions.h"
+#include "core/logging/Logging.h"
+#include "core/math/Vector3.h"
+
+#include "domain_decomposition/IBlock.h"
+
+#include "field/GhostLayerField.h"
+
+#include "lbm/field/PdfField.h"
+#include "lbm/free_surface/FlagInfo.h"
+#include "lbm/free_surface/dynamics/PdfRefillingModel.h"
+#include "lbm/free_surface/surface_geometry/NormalSweep.h"
+
+#include "stencil/D3Q6.h"
+
+#include <functional>
+#include <vector>
+
+#include "PdfRefillingModel.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Base class for all sweeps to reinitialize (refill) all PDFs in cells that were converted from gas to interface.
+ * This is required since gas cells do not have PDFs. The sweep expects that a previous sweep has set the
+ * "convertedFromGasToInterface" flag and reinitializes the PDFs in all cells with this flag according to the specified
+ * model.
+ **********************************************************************************************************************/
+template< typename LatticeModel_T, typename FlagField_T >
+class RefillingSweepBase
+{
+ public:
+ using PdfField_T = lbm::PdfField< LatticeModel_T >;
+ using flag_t = typename FlagField_T::flag_t;
+ using Stencil_T = typename LatticeModel_T::Stencil;
+
+ RefillingSweepBase(const BlockDataID& pdfFieldID, const ConstBlockDataID& flagFieldID,
+ const FlagInfo< FlagField_T >& flagInfo, bool useDataFromGhostLayers)
+ : pdfFieldID_(pdfFieldID), flagFieldID_(flagFieldID), flagInfo_(flagInfo),
+ useDataFromGhostLayers_(useDataFromGhostLayers)
+ {}
+
+ virtual void operator()(IBlock* const block) = 0;
+
+ virtual ~RefillingSweepBase() = default;
+
+ real_t getAverageDensityAndVelocity(const Cell& cell, const PdfField_T& pdfField, const FlagField_T& flagField,
+ const FlagInfo< FlagField_T >& flagInfo, Vector3< real_t >& avgVelocity)
+ {
+ std::vector< bool > validStencilIndices(Stencil_T::Size, false);
+ return getAverageDensityAndVelocity(cell, pdfField, flagField, flagInfo, avgVelocity, validStencilIndices);
+ }
+
+ // also stores stencil indices of valid neighboring cells (liquid/ non-newly converted interface) in a vector
+ real_t getAverageDensityAndVelocity(const Cell& cell, const PdfField_T& pdfField, const FlagField_T& flagField,
+ const FlagInfo< FlagField_T >& flagInfo, Vector3< real_t >& avgVelocity,
+ std::vector< bool >& validStencilIndices);
+
+ // returns the averaged PDFs of valid neighboring cells (liquid/ non-newly converted interface)
+ std::vector< real_t > getAveragePdfs(const Cell& cell, const PdfField_T& pdfField, const FlagField_T& flagField,
+ const FlagInfo< FlagField_T >& flagInfo);
+
+ protected:
+ BlockDataID pdfFieldID_;
+ ConstBlockDataID flagFieldID_;
+ FlagInfo< FlagField_T > flagInfo_;
+ bool useDataFromGhostLayers_;
+}; // class RefillingSweepBase
+
+/***********************************************************************************************************************
+ * Base class for refilling models that need to obtain information by extrapolation from neighboring cells.
+ *
+ * The parameter "useDataFromGhostLayers" is useful, when reducedCommunication is used, i.e., when not all PDFs are
+ * communicated in the PDF field but only those that are actually required in a certain direction. This is currently not
+ * used in the free surface part of waLBerla: In SurfaceDynamicsHandler, SimpleCommunication uses the default PackInfo
+ * of the GhostLayerField for PDF communication. The optimized version would be using the PdfFieldPackInfo (in
+ * src/lbm/communication).
+ **********************************************************************************************************************/
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+class ExtrapolationRefillingSweepBase : public RefillingSweepBase< LatticeModel_T, FlagField_T >
+{
+ public:
+ using RefillingSweepBase_T = RefillingSweepBase< LatticeModel_T, FlagField_T >;
+ using PdfField_T = typename RefillingSweepBase_T::PdfField_T;
+ using flag_t = typename RefillingSweepBase_T::flag_t;
+ using Stencil_T = typename RefillingSweepBase_T::Stencil_T;
+
+ ExtrapolationRefillingSweepBase(const BlockDataID& pdfFieldID, const ConstBlockDataID& flagFieldID,
+ const ConstBlockDataID& fillFieldID, const FlagInfo< FlagField_T >& flagInfo,
+ uint_t extrapolationOrder, bool useDataFromGhostLayers)
+ : RefillingSweepBase_T(pdfFieldID, flagFieldID, flagInfo, useDataFromGhostLayers), fillFieldID_(fillFieldID),
+ extrapolationOrder_(extrapolationOrder)
+ {}
+
+ virtual ~ExtrapolationRefillingSweepBase() = default;
+
+ virtual void operator()(IBlock* const block) = 0;
+
+ /********************************************************************************************************************
+ * Find the lattice direction in the given stencil that corresponds best to the provided direction.
+ *
+ * Mostly copied from src/lbm_mesapd_coupling/momentum_exchange_method/reconstruction/ExtrapolationDirectionFinder.h.
+ *******************************************************************************************************************/
+ Vector3< cell_idx_t > findCorrespondingLatticeDirection(const Vector3< real_t >& direction);
+
+ /********************************************************************************************************************
+ * The extrapolation direction is chosen such that it most closely resembles the surface normal in the cell.
+ *
+ * The normal has to be recomputed here and MUST NOT be taken directly from the normal field because the fill levels
+ * will have changed since the last computation of the normal. As the normal is computed from the fill levels, it
+ * must be recomputed to have an up-to-date normal.
+ *******************************************************************************************************************/
+ Vector3< cell_idx_t > findExtrapolationDirection(const Cell& cell, const FlagField_T& flagField,
+ const ScalarField_T& fillField);
+
+ /********************************************************************************************************************
+ * Determine the number of applicable (liquid or interface) cells for extrapolation in the given extrapolation
+ * direction.
+ *******************************************************************************************************************/
+ uint_t getNumberOfExtrapolationCells(const Cell& cell, const FlagField_T& flagField, const PdfField_T& pdfField,
+ const Vector3< cell_idx_t >& extrapolationDirection);
+
+ /********************************************************************************************************************
+ * Get the non-equilibrium part of all PDFs in "cell" and store them in a std::vector<real_t>.
+ *******************************************************************************************************************/
+ std::vector< real_t > getNonEquilibriumPdfsInCell(const Cell& cell, lbm::PdfField< LatticeModel_T >& pdfField);
+
+ /********************************************************************************************************************
+ * Get all PDFs in "cell" and store them in a std::vector<real_t>.
+ *******************************************************************************************************************/
+ std::vector< real_t > getPdfsInCell(const Cell& cell, lbm::PdfField< LatticeModel_T >& pdfField);
+
+ /********************************************************************************************************************
+ * Set the PDFs in cell "x" according to the following linear combination:
+ * f(x,q) = f(x,q) + 3 * f^{get}(x+e,q) - 3 * f^{get}(x+2e,q) + 1 * f^{get}(x+3e,q)
+ * with x: cell position
+ * q: index of the respective PDF
+ * e: extrapolation direction
+ * f^{get}: PDF specified by getPdfFunc
+ * "includeThisCell" defines whether f(x,q) is included
+ *
+ * Note: this function does NOT assert out of bounds access, i.e., it may only be called for cells that have at least
+ * three neighboring cells in extrapolationDirection.
+ *******************************************************************************************************************/
+ void applyQuadraticExtrapolation(
+ const Cell& cell, lbm::PdfField< LatticeModel_T >& pdfField, const Vector3< cell_idx_t >& extrapolationDirection,
+ bool includeThisCell,
+ const std::function< std::vector< real_t >(const Cell& cell, lbm::PdfField< LatticeModel_T >& pdfField) >&
+ getPdfFunc);
+
+ /********************************************************************************************************************
+ * Set the PDFs in cell (x) according to the following linear combination:
+ * f(x,q) = f(x,q) + 2 * f^{get}(x+1e,q) - 1 * f^{get}(x+2e,q)
+ * with x: cell position
+ * q: index of the respective PDF
+ * e: extrapolation direction
+ * f^{get}: PDF specified by getPdfFunc
+ * "includeThisCell" defines whether f(x,q) is included
+ *
+ * Note: this function does NOT assert out of bounds access, i.e., it may only be called for cells that have at least
+ * two neighboring cells in extrapolationDirection.
+ *******************************************************************************************************************/
+ void applyLinearExtrapolation(
+ const Cell& cell, lbm::PdfField< LatticeModel_T >& pdfField, const Vector3< cell_idx_t >& extrapolationDirection,
+ bool includeThisCell,
+ const std::function< std::vector< real_t >(const Cell& cell, lbm::PdfField< LatticeModel_T >& pdfField) >&
+ getPdfFunc);
+
+ /********************************************************************************************************************
+ * Set the PDFs in cell (x) according to the following linear combination:
+ * f(x,q) = f(x,q) + 1 * f^{get}(x+1e,q)
+ * with x: cell position
+ * q: index of the respective PDF
+ * e: extrapolation direction
+ * f^{get}: PDF specified by getPdfFunc
+ * "includeThisCell" defines whether f(x,q) is included
+ *
+ * Note: this function does NOT assert out of bounds access, i.e., it may only be called for cells that have at least
+ * a neighboring cell in extrapolationDirection.
+ *******************************************************************************************************************/
+ void applyConstantExtrapolation(
+ const Cell& cell, lbm::PdfField< LatticeModel_T >& pdfField, const Vector3< cell_idx_t >& extrapolationDirection,
+ bool includeThisCell,
+ const std::function< std::vector< real_t >(const Cell& cell, lbm::PdfField< LatticeModel_T >& pdfField) >&
+ getPdfFunc);
+
+ protected:
+ ConstBlockDataID fillFieldID_;
+ uint_t extrapolationOrder_;
+}; // class ExtrapolationRefillingSweepBase
+
+/***********************************************************************************************************************
+ * EquilibriumRefillingSweep:
+ * PDFs are initialized with the equilibrium based on the average density and velocity from neighboring liquid and
+ * (non-newly converted) interface cells.
+ *
+ * Reference: dissertation of N. Thuerey, 2007, section 4.3
+ *
+ * f(x,q) = f^{eq}(x+e,q)
+ * with x: cell position
+ * q: index of the respective PDF
+ * e: direction of a valid neighbor
+ **********************************************************************************************************************/
+
+template< typename LatticeModel_T, typename FlagField_T >
+class EquilibriumRefillingSweep : public RefillingSweepBase< LatticeModel_T, FlagField_T >
+{
+ public:
+ using RefillingSweepBase_T = RefillingSweepBase< LatticeModel_T, FlagField_T >;
+ using PdfField_T = typename RefillingSweepBase_T::PdfField_T;
+ using flag_t = typename RefillingSweepBase_T::flag_t;
+ using Stencil_T = typename RefillingSweepBase_T::Stencil_T;
+
+ EquilibriumRefillingSweep(const BlockDataID& pdfFieldID, const ConstBlockDataID& flagFieldID,
+ const FlagInfo< FlagField_T >& flagInfo, bool useDataFromGhostLayers)
+ : RefillingSweepBase_T(pdfFieldID, flagFieldID, flagInfo, useDataFromGhostLayers)
+ {}
+
+ ~EquilibriumRefillingSweep() override = default;
+
+ void operator()(IBlock* const block) override;
+}; // class EquilibriumRefillingSweep
+
+/***********************************************************************************************************************
+ * AverageRefillingSweep:
+ * PDFs are initialized with the average of the PDFs in the same direction from applicable neighboring cells.
+ *
+ * f_i(x,q) = \sum_N( f_i(x+e,q) ) / N
+ * with x: cell position
+ * i: PDF index, i.e., direction
+ * q: index of the respective PDF
+ * e: direction of a valid neighbor
+ * N: number of applicable neighbors
+ * sum_N: sum over all applicable neighbors
+ *
+ * Reference: not available in literature (as of 06/2022).
+ **********************************************************************************************************************/
+
+template< typename LatticeModel_T, typename FlagField_T >
+class AverageRefillingSweep : public RefillingSweepBase< LatticeModel_T, FlagField_T >
+{
+ public:
+ using RefillingSweepBase_T = RefillingSweepBase< LatticeModel_T, FlagField_T >;
+ using PdfField_T = typename RefillingSweepBase_T::PdfField_T;
+ using flag_t = typename RefillingSweepBase_T::flag_t;
+ using Stencil_T = typename RefillingSweepBase_T::Stencil_T;
+
+ AverageRefillingSweep(const BlockDataID& pdfFieldID, const ConstBlockDataID& flagFieldID,
+ const FlagInfo< FlagField_T >& flagInfo, bool useDataFromGhostLayers)
+ : RefillingSweepBase_T(pdfFieldID, flagFieldID, flagInfo, useDataFromGhostLayers)
+ {}
+
+ ~AverageRefillingSweep() override = default;
+
+ void operator()(IBlock* const block) override;
+}; // class AverageRefillingSweep
+
+/***********************************************************************************************************************
+ * EquilibriumAndNonEquilibriumRefilling:
+ * First reconstruct the equilibrium values according to the "EquilibriumRefilling". Then extrapolate the
+ * non-equilibrium part of the PDFs in the direction of the surface normal and add it to the (equilibrium-)
+ * reinitialized PDFs.
+ *
+ * Reference: equation (51) in Peng et al., "Implementation issues and benchmarking of lattice Boltzmann method for
+ * moving rigid particle simulations in a viscous flow", 2015, doi: 10.1016/j.camwa.2015.08.027)
+ *
+ * f_q(x,t+dt) = f_q^{eq}(x,t) + f_q^{neq}(x+e*dt,t+dt)
+ * with x: cell position
+ * q: index of the respective PDF
+ * e: direction of a valid neighbor/ extrapolation direction
+ * t: current time step
+ * dt: time step width
+ * f^{eq}: equilibrium PDF with velocity and density averaged from neighboring cells
+ * f^{neq}: non-equilibrium PDF (f - f^{eq})
+ *
+ * Note: Analogously as in the "ExtrapolationRefilling", the expression "f_q^{neq}(x+e*dt,t+dt)" can also be obtained by
+ * extrapolation (in literature, only zeroth order extrapolation is used/documented):
+ * - zeroth order: f_q^{neq}(x+e*dt,t+dt)
+ * - first order: 2 * f_q^{neq}(x+e*dt,t+dt) - 1 * f_q^{neq}(x+2e*dt,t+dt)
+ * - second order: 3 * f_q^{neq}(x+e*dt,t+dt) - 3 * f_q^{neq}(x+2e*dt,t+dt) + f_q^{neq}(x+3e*dt,t+dt)
+ * If not enough cells are available for the chosen extrapolation order, the algorithm falls back to the corresponding
+ * lower order. If even zeroth order can not be applied, only f_q^{eq}(x,t) is considered which corresponds to
+ * "EquilibriumRefilling".
+ **********************************************************************************************************************/
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+class EquilibriumAndNonEquilibriumRefillingSweep
+ : public ExtrapolationRefillingSweepBase< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >
+{
+ public:
+ using ExtrapolationRefillingSweepBase_T =
+ ExtrapolationRefillingSweepBase< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >;
+ using RefillingSweepBase_T = typename ExtrapolationRefillingSweepBase_T::RefillingSweepBase_T;
+ using PdfField_T = typename ExtrapolationRefillingSweepBase_T::PdfField_T;
+ using flag_t = typename ExtrapolationRefillingSweepBase_T::flag_t;
+ using Stencil_T = typename ExtrapolationRefillingSweepBase_T::Stencil_T;
+
+ EquilibriumAndNonEquilibriumRefillingSweep(const BlockDataID& pdfFieldID, const ConstBlockDataID& flagFieldID,
+ const ConstBlockDataID& fillFieldID,
+ const FlagInfo< FlagField_T >& flagInfo, uint_t extrapolationOrder,
+ bool useDataFromGhostLayers)
+ : ExtrapolationRefillingSweepBase_T(pdfFieldID, flagFieldID, fillFieldID, flagInfo, extrapolationOrder,
+ useDataFromGhostLayers)
+ {}
+
+ ~EquilibriumAndNonEquilibriumRefillingSweep() override = default;
+
+ void operator()(IBlock* const block) override;
+}; // class EquilibriumAndNonEquilibriumRefillingSweep
+
+/***********************************************************************************************************************
+ * ExtrapolationRefilling:
+ * Extrapolate the PDFs of one or more cells in the direction of the surface normal.
+ *
+ * Reference: equation (50) in Peng et al., "Implementation issues and benchmarking of lattice Boltzmann method for
+ * moving rigid particle simulations in a viscous flow", 2015, doi: 10.1016/j.camwa.2015.08.027)
+ *
+ * f_q(x,t+dt) = 3 * f_q(x+e*dt,t+dt) - 3 * f_q(x+2e*dt,t+dt) + f_q(x+3e*dt,t+dt)
+ * with x: cell position
+ * q: index of the respective PDF
+ * e: direction of a valid neighbor/ extrapolation direction
+ * t: current time step
+ * dt: time step width
+ * Note: The equation contains a second order extrapolation, however other options are also available. If not enough
+ * cells are available for second order extrapolation, the algorithm falls back to the next applicable
+ * lower order:
+ * - second order: 3 * f_q(x+e*dt,t+dt) - 3 * f_q(x+2e*dt,t+dt) + f_q(x+3e*dt,t+dt)
+ * - first order: 2 * f_q(x+e*dt,t+dt) - 1 * f_q(x+2e*dt,t+dt)
+ * - zeroth order: f_q(x+e*dt,t+dt)
+ * If even zeroth order can not be applied, only f_q^{eq}(x,t) is considered which corresponds to
+ * "EquilibriumRefilling".
+ **********************************************************************************************************************/
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+class ExtrapolationRefillingSweep
+ : public ExtrapolationRefillingSweepBase< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >
+{
+ public:
+ using ExtrapolationRefillingSweepBase_T =
+ ExtrapolationRefillingSweepBase< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >;
+ using RefillingSweepBase_T = typename ExtrapolationRefillingSweepBase_T::RefillingSweepBase_T;
+ using PdfField_T = typename ExtrapolationRefillingSweepBase_T::PdfField_T;
+ using flag_t = typename ExtrapolationRefillingSweepBase_T::flag_t;
+ using Stencil_T = typename ExtrapolationRefillingSweepBase_T::Stencil_T;
+
+ ExtrapolationRefillingSweep(const BlockDataID& pdfFieldID, const ConstBlockDataID& flagFieldID,
+ const ConstBlockDataID& fillFieldID, const FlagInfo< FlagField_T >& flagInfo,
+ uint_t extrapolationOrder, bool useDataFromGhostLayers)
+ : ExtrapolationRefillingSweepBase_T(pdfFieldID, flagFieldID, fillFieldID, flagInfo, extrapolationOrder,
+ useDataFromGhostLayers)
+ {}
+
+ ~ExtrapolationRefillingSweep() override = default;
+
+ void operator()(IBlock* const block) override;
+}; // class ExtrapolationRefillingSweep
+
+/***********************************************************************************************************************
+ * GradsMomentsRefilling:
+ * Reconstruct missing PDFs based on Grad's moment closure.
+ *
+ * References: - equation (11) in Chikatamarla et al., "Grad’s approximation for missing data in lattice Boltzmann
+ * simulations", 2006, doi: 10.1209/epl/i2005-10535-x
+ * - equation (10) in Dorscher et al., "Grad’s approximation for moving and stationary walls in entropic
+ * lattice Boltzmann simulations", 2015, doi: 10.1016/j.jcp.2015.04.017
+ *
+ * The following equation is a rewritten and easier version of the equation in the above references:
+ * f_q(x,t+dt) = f_q^{eq}(x,t) +
+ * w_q * rho / 2 / cs^2 / omega * (du_a / dx_b + du_b / dx_a)(cs^2 * delta_{ab} - c_{q,a}c_{q,b} )
+ * with x: cell position
+ * q: index of the respective PDF
+ * t: current time step
+ * f^{eq}: equilibrium PDF with velocity and density averaged from neighboring cells
+ * w_q: lattice weight
+ * rho: density averaged from neighboring cells
+ * cs: lattice speed of sound
+ * omega: relaxation rate
+ * du_a / dx_b: gradient of the velocity (in index notation)
+ * delta_{ab}: Kronecker delta (in index notation)
+ * c_q{q,a}: lattice velocity (in index notation)
+ *
+ * The velocity gradient is computed using a first order central finite difference scheme if two neighboring cells
+ * are available. Otherwise, a first order upwind scheme is applied.
+ * IMPORTANT REMARK: The current implementation only works for dx=1 (this is assumed in the gradient computation).
+ **********************************************************************************************************************/
+template< typename LatticeModel_T, typename FlagField_T >
+class GradsMomentsRefillingSweep : public RefillingSweepBase< LatticeModel_T, FlagField_T >
+{
+ public:
+ using RefillingSweepBase_T = RefillingSweepBase< LatticeModel_T, FlagField_T >;
+ using PdfField_T = typename RefillingSweepBase_T::PdfField_T;
+ using flag_t = typename RefillingSweepBase_T::flag_t;
+ using Stencil_T = typename RefillingSweepBase_T::Stencil_T;
+
+ GradsMomentsRefillingSweep(const BlockDataID& pdfFieldID, const ConstBlockDataID& flagFieldID,
+ const FlagInfo< FlagField_T >& flagInfo, real_t relaxRate, bool useDataFromGhostLayers)
+
+ : RefillingSweepBase_T(pdfFieldID, flagFieldID, flagInfo, useDataFromGhostLayers), relaxRate_(relaxRate)
+ {}
+
+ ~GradsMomentsRefillingSweep() override = default;
+
+ void operator()(IBlock* const block) override;
+
+ // compute the gradient of the velocity in the specified direction
+ // - using a first order central finite difference scheme if two valid neighboring cells are available
+ // - using a first order upwind scheme if only one valid neighboring cell is available
+ // - assuming a gradient of zero if no valid neighboring cell is available
+ Vector3< real_t > getVelocityGradient(stencil::Direction direction, const Cell& cell, const PdfField_T* pdfField,
+ const Vector3< real_t >& avgVelocity,
+ const std::vector< bool >& validStencilIndices);
+
+ private:
+ real_t relaxRate_;
+}; // class GradsMomentApproximationRefilling
+
+} // namespace free_surface
+} // namespace walberla
+
+#include "PdfRefillingSweep.impl.h"
\ No newline at end of file
diff --git a/src/lbm/free_surface/dynamics/PdfRefillingSweep.impl.h b/src/lbm/free_surface/dynamics/PdfRefillingSweep.impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..cc5c382e5bd5f1fe91374d608f306bdbd54aed24
--- /dev/null
+++ b/src/lbm/free_surface/dynamics/PdfRefillingSweep.impl.h
@@ -0,0 +1,718 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file PdfRefillingSweep.impl.h
+//! \ingroup dynamics
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \author Michael Zikeli
+//! \brief Sweeps for refilling cells (i.e. reinitializing PDFs) after the cell was converted from gas to interface.
+//
+//======================================================================================================================
+
+#include "core/DataTypes.h"
+#include "core/cell/Cell.h"
+#include "core/debug/CheckFunctions.h"
+#include "core/logging/Logging.h"
+#include "core/math/Vector3.h"
+
+#include "domain_decomposition/IBlock.h"
+
+#include "field/GhostLayerField.h"
+
+#include "lbm/field/Equilibrium.h"
+#include "lbm/field/PdfField.h"
+#include "lbm/free_surface/FlagInfo.h"
+#include "lbm/free_surface/dynamics/PdfRefillingModel.h"
+#include "lbm/free_surface/surface_geometry/NormalSweep.h"
+
+#include "stencil/D3Q6.h"
+
+#include <set>
+#include <vector>
+
+#include "PdfRefillingSweep.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+template< typename LatticeModel_T, typename FlagField_T >
+real_t RefillingSweepBase< LatticeModel_T, FlagField_T >::getAverageDensityAndVelocity(
+ const Cell& cell, const PdfField_T& pdfField, const FlagField_T& flagField, const FlagInfo< FlagField_T >& flagInfo,
+ Vector3< real_t >& avgVelocity, std::vector< bool >& validStencilIndices)
+{
+ real_t rho = real_c(0.0);
+ Vector3< real_t > u(real_c(0.0));
+ uint_t numNeighbors = uint_c(0);
+
+ // do not use data from ghost layer if optimized communication is used (see comment in PdfRefillingSweep.h at
+ // ExtrapolationRefillingSweepBase)
+ const CellInterval localDomain = useDataFromGhostLayers_ ? pdfField.xyzSizeWithGhostLayer() : pdfField.xyzSize();
+
+ for (auto i = Stencil_T::beginNoCenter(); i != Stencil_T::end(); ++i)
+ {
+ const Cell neighborCell(cell[0] + i.cx(), cell[1] + i.cy(), cell[2] + i.cz());
+
+ const flag_t neighborFlag = flagField.get(neighborCell);
+ const flag_t liquidInterfaceMask = flagInfo.interfaceFlag | flagInfo.liquidFlag;
+
+ // only use neighboring cell if
+ // - neighboring cell is part of the block-local domain
+ // - neighboring cell is liquid or interface
+ // - not newly converted from G->I
+ const bool useNeighbor = isPartOfMaskSet(neighborFlag, liquidInterfaceMask) &&
+ !flagInfo.hasConvertedFromGasToInterface(flagField.get(neighborCell)) &&
+ localDomain.contains(neighborCell);
+
+ // calculate the average of valid neighbor cells to calculate an average density and velocity.
+ if (useNeighbor)
+ {
+ numNeighbors++;
+ const typename PdfField_T::ConstPtr neighbor(pdfField, neighborCell[0], neighborCell[1], neighborCell[2]);
+ Vector3< real_t > neighborU;
+ real_t neighborRho;
+ neighborRho = lbm::getDensityAndMomentumDensity(neighborU, pdfField.latticeModel(), neighbor);
+ neighborU /= neighborRho;
+ u += neighborU;
+ rho += neighborRho;
+
+ validStencilIndices[i.toIdx()] = true;
+ }
+ }
+
+ // normalize the newly calculated velocity and density
+ if (numNeighbors != uint_c(0))
+ {
+ u /= real_c(numNeighbors);
+ rho /= real_c(numNeighbors);
+ }
+ else
+ {
+ u = Vector3< real_t >(0.0);
+ rho = real_c(1.0);
+ WALBERLA_LOG_WARNING_ON_ROOT("There are no valid neighbors for the refilling of (block-local) cell: " << cell);
+ }
+
+ avgVelocity = u;
+ return rho;
+}
+
+template< typename LatticeModel_T, typename FlagField_T >
+std::vector< real_t > RefillingSweepBase< LatticeModel_T, FlagField_T >::getAveragePdfs(
+ const Cell& cell, const PdfField_T& pdfField, const FlagField_T& flagField, const FlagInfo< FlagField_T >& flagInfo)
+{
+ uint_t numNeighbors = uint_c(0);
+
+ // do not use data from ghost layer if optimized communication is used (see comment in PdfRefillingSweep.h at
+ // ExtrapolationRefillingSweepBase)
+ const CellInterval localDomain = useDataFromGhostLayers_ ? pdfField.xyzSizeWithGhostLayer() : pdfField.xyzSize();
+
+ std::vector< real_t > pdfSum(Stencil_T::Size, real_c(0));
+
+ for (auto i = Stencil_T::beginNoCenter(); i != Stencil_T::end(); ++i)
+ {
+ const Cell neighborCell(cell[0] + i.cx(), cell[1] + i.cy(), cell[2] + i.cz());
+
+ const flag_t neighborFlag = flagField.get(neighborCell);
+ const flag_t liquidInterfaceMask = flagInfo.interfaceFlag | flagInfo.liquidFlag;
+
+ // only use neighboring cell if
+ // - neighboring cell is part of the block-local domain
+ // - neighboring cell is liquid or interface
+ // - not newly converted from G->I
+ const bool useNeighbor = isPartOfMaskSet(neighborFlag, liquidInterfaceMask) &&
+ !flagInfo.hasConvertedFromGasToInterface(flagField.get(neighborCell)) &&
+ localDomain.contains(neighborCell);
+
+ // calculate the average of valid neighbor cells to calculate an average of PDFs in each direction
+ if (useNeighbor)
+ {
+ ++numNeighbors;
+ for (auto pdfDir = Stencil_T::begin(); pdfDir != Stencil_T::end(); ++pdfDir)
+ {
+ pdfSum[pdfDir.toIdx()] += pdfField.get(neighborCell, *pdfDir);
+ }
+ }
+ }
+
+ // average the PDFs of all neighboring cells
+ if (numNeighbors != uint_c(0))
+ {
+ for (auto& pdf : pdfSum)
+ {
+ pdf /= real_c(numNeighbors);
+ }
+ }
+ else
+ {
+ // fall back to EquilibriumRefilling by setting PDFs according to equilibrium with velocity=0 and density=1
+ lbm::Equilibrium< LatticeModel_T >::set(pdfSum, Vector3< real_t >(real_c(0)), real_c(1));
+
+ WALBERLA_LOG_WARNING_ON_ROOT("There are no valid neighbors for the refilling of (block-local) cell: " << cell);
+ }
+
+ return pdfSum;
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+Vector3< cell_idx_t > ExtrapolationRefillingSweepBase< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >::
+ findCorrespondingLatticeDirection(const Vector3< real_t >& direction)
+{
+ if (direction == Vector3< real_t >(real_c(0))) { return direction; }
+
+ stencil::Direction bestFittingDirection = stencil::C; // arbitrary default initialization
+ real_t scalarProduct = real_c(0);
+
+ for (auto dir = Stencil_T::beginNoCenter(); dir != Stencil_T::end(); ++dir)
+ {
+ // compute inner product <dir,c_i>
+ const real_t scalarProductTmp = direction[0] * stencil::cNorm[0][*dir] + direction[1] * stencil::cNorm[1][*dir] +
+ direction[2] * stencil::cNorm[2][*dir];
+ if (scalarProductTmp > scalarProduct)
+ {
+ // largest scalar product is the best fitting lattice direction, i.e., this direction has the smallest angle to
+ // the given direction
+ scalarProduct = scalarProductTmp;
+ bestFittingDirection = *dir;
+ }
+ }
+
+ return Vector3< cell_idx_t >(stencil::cx[bestFittingDirection], stencil::cy[bestFittingDirection],
+ stencil::cz[bestFittingDirection]);
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+Vector3< cell_idx_t >
+ ExtrapolationRefillingSweepBase< LatticeModel_T, FlagField_T, ScalarField_T,
+ VectorField_T >::findExtrapolationDirection(const Cell& cell,
+ const FlagField_T& flagField,
+ const ScalarField_T& fillField)
+{
+ Vector3< real_t > normal = Vector3< real_t >(real_c(0));
+
+ // get flag mask for obstacle boundaries
+ const flag_t obstacleFlagMask = flagField.getMask(RefillingSweepBase_T::flagInfo_.getObstacleIDSet());
+
+ // get flag mask for liquid, interface, and gas cells
+ const flag_t liquidInterfaceGasMask = flagField.getMask(flagIDs::liquidInterfaceGasFlagIDs);
+
+ const typename ScalarField_T::ConstPtr fillPtr(fillField, cell.x(), cell.y(), cell.z());
+ const typename FlagField_T::ConstPtr flagPtr(flagField, cell.x(), cell.y(), cell.z());
+
+ if (!isFlagInNeighborhood< Stencil_T >(flagPtr, obstacleFlagMask))
+ {
+ normal_computation::computeNormal<
+ typename std::conditional< Stencil_T::D == uint_t(2), stencil::D2Q9, stencil::D3Q27 >::type >(
+ normal, fillPtr, flagPtr, liquidInterfaceGasMask);
+ }
+ else
+ {
+ normal_computation::computeNormalNearSolidBoundary<
+ typename std::conditional< Stencil_T::D == uint_t(2), stencil::D2Q9, stencil::D3Q27 >::type >(
+ normal, fillPtr, flagPtr, liquidInterfaceGasMask, obstacleFlagMask);
+ }
+
+ // normalize normal (in contrast to the usual definition in FSLBM, it points from gas to fluid here)
+ normal = normal.getNormalizedOrZero();
+
+ // find the lattice direction that most closely resembles the normal direction
+ // Note: the normal must point from gas to fluid because the extrapolation direction is also defined to point from
+ // gas to fluid
+ return findCorrespondingLatticeDirection(normal);
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+uint_t ExtrapolationRefillingSweepBase< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >::
+ getNumberOfExtrapolationCells(const Cell& cell, const FlagField_T& flagField, const PdfField_T& pdfField,
+ const Vector3< cell_idx_t >& extrapolationDirection)
+{
+ // skip center cell
+ if (extrapolationDirection == Vector3< cell_idx_t >(cell_idx_c(0))) { return uint_c(0); }
+
+ // do not use data from ghost layer if optimized communication is used (see comment in PdfRefillingSweep.h at
+ // ExtrapolationRefillingSweepBase)
+ const CellInterval localDomain =
+ (RefillingSweepBase_T::useDataFromGhostLayers_) ? pdfField.xyzSizeWithGhostLayer() : pdfField.xyzSize();
+
+ // for extrapolation order n, n+1 applicable cells must be available in the desired direction
+ const uint_t maxExtrapolationCells = extrapolationOrder_ + uint_c(1);
+
+ for (uint_t numCells = uint_c(1); numCells <= maxExtrapolationCells; ++numCells)
+ {
+ // potential cell used for extrapolation
+ const Cell checkCell = cell + Cell(cell_idx_c(numCells) * extrapolationDirection);
+
+ const flag_t neighborFlag = flagField.get(checkCell);
+ const flag_t liquidInterfaceMask =
+ RefillingSweepBase_T::flagInfo_.interfaceFlag | RefillingSweepBase_T::flagInfo_.liquidFlag;
+
+ // only use cell if the cell is
+ // - inside domain
+ // - liquid or interface
+ // - not a cell that has also just been converted from gas to interface
+ if (!localDomain.contains(checkCell) || !isPartOfMaskSet(neighborFlag, liquidInterfaceMask) ||
+ RefillingSweepBase_T::flagInfo_.hasConvertedFromGasToInterface(flagField.get(checkCell)))
+ {
+ return numCells - uint_c(1);
+ }
+ }
+
+ return maxExtrapolationCells;
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+std::vector< real_t > ExtrapolationRefillingSweepBase< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >::
+ getNonEquilibriumPdfsInCell(const Cell& cell, lbm::PdfField< LatticeModel_T >& pdfField)
+{
+ std::vector< real_t > nonEquilibriumPartOfPdfs(Stencil_T::Size);
+
+ Vector3< real_t > velocity;
+ const real_t density = pdfField.getDensityAndVelocity(velocity, cell);
+
+ // compute non-equilibrium of each PDF
+ for (auto dir = Stencil_T::begin(); dir != Stencil_T::end(); ++dir)
+ {
+ nonEquilibriumPartOfPdfs[dir.toIdx()] =
+ pdfField.get(cell, dir.toIdx()) - lbm::EquilibriumDistribution< LatticeModel_T >::get(*dir, velocity, density);
+ }
+ return nonEquilibriumPartOfPdfs;
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+std::vector< real_t >
+ ExtrapolationRefillingSweepBase< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >::getPdfsInCell(
+ const Cell& cell, lbm::PdfField< LatticeModel_T >& pdfField)
+{
+ std::vector< real_t > Pdfs(Stencil_T::Size);
+
+ for (auto dir = Stencil_T::begin(); dir != Stencil_T::end(); ++dir)
+ {
+ Pdfs[dir.toIdx()] = pdfField.get(cell, dir.toIdx());
+ }
+ return Pdfs;
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+void ExtrapolationRefillingSweepBase< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >::
+ applyQuadraticExtrapolation(
+ const Cell& cell, lbm::PdfField< LatticeModel_T >& pdfField, const Vector3< cell_idx_t >& extrapolationDirection,
+ bool includeThisCell,
+ const std::function< std::vector< real_t >(const Cell& cell, lbm::PdfField< LatticeModel_T >& pdfField) >&
+ getPdfFunc)
+{
+ // store the PDFs of the cells participating in the extrapolation
+ std::vector< real_t > pdfsXf(LatticeModel_T::Stencil::Size); // cell + 1 * extrapolationDirection
+ std::vector< real_t > pdfsXff(LatticeModel_T::Stencil::Size); // cell + 2 * extrapolationDirection
+ std::vector< real_t > pdfsXfff(LatticeModel_T::Stencil::Size); // cell + 3 * extrapolationDirection
+
+ // determines if the PDFs of the current cell are also considered
+ const real_t centerFactor = includeThisCell ? real_c(1) : real_c(0);
+
+ // get PDFs
+ pdfsXf = getPdfFunc(cell + Cell(cell_idx_c(1) * extrapolationDirection), pdfField);
+ pdfsXff = getPdfFunc(cell + Cell(cell_idx_c(2) * extrapolationDirection), pdfField);
+ pdfsXfff = getPdfFunc(cell + Cell(cell_idx_c(3) * extrapolationDirection), pdfField);
+
+ // compute the resulting PDF values of "cell" according to second order extrapolation
+ for (auto dir = Stencil_T::begin(); dir != Stencil_T::end(); ++dir)
+ {
+ pdfField.get(cell, dir.toIdx()) = centerFactor * pdfField.get(cell, dir.toIdx()) +
+ real_c(3) * pdfsXf[dir.toIdx()] - real_c(3) * pdfsXff[dir.toIdx()] +
+ real_c(1) * pdfsXfff[dir.toIdx()];
+ }
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+void ExtrapolationRefillingSweepBase< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >::
+ applyLinearExtrapolation(
+ const Cell& cell, lbm::PdfField< LatticeModel_T >& pdfField, const Vector3< cell_idx_t >& extrapolationDirection,
+ bool includeThisCell,
+ const std::function< std::vector< real_t >(const Cell& cell, lbm::PdfField< LatticeModel_T >& pdfField) >&
+ getPdfFunc)
+{
+ // store the PDFs of the cells participating in the interpolation
+ std::vector< real_t > pdfsXf(Stencil_T::Size); // cell + 1 * extrapolationDirection
+ std::vector< real_t > pdfsXff(Stencil_T::Size); // cell + 2 * extrapolationDirection
+
+ // determines if the PDFs of the current cell are also considered
+ const real_t centerFactor = includeThisCell ? real_c(1) : real_c(0);
+
+ // get PDFs
+ pdfsXf = getPdfFunc(cell + Cell(cell_idx_c(1) * extrapolationDirection), pdfField);
+ pdfsXff = getPdfFunc(cell + Cell(cell_idx_c(2) * extrapolationDirection), pdfField);
+
+ // compute the resulting PDF values of "cell" according to first order extrapolation
+ for (auto dir = Stencil_T::begin(); dir != Stencil_T::end(); ++dir)
+ {
+ pdfField.get(cell, dir.toIdx()) = centerFactor * pdfField.get(cell, dir.toIdx()) +
+ real_c(2) * pdfsXf[dir.toIdx()] - real_c(1) * pdfsXff[dir.toIdx()];
+ }
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+void ExtrapolationRefillingSweepBase< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >::
+ applyConstantExtrapolation(
+ const Cell& cell, lbm::PdfField< LatticeModel_T >& pdfField, const Vector3< cell_idx_t >& extrapolationDirection,
+ bool includeThisCell,
+ const std::function< std::vector< real_t >(const Cell& cell, lbm::PdfField< LatticeModel_T >& pdfField) >&
+ getPdfFunc)
+{
+ // store the PDFs of the cells participating in the interpolation
+ std::vector< real_t > pdfsXf(Stencil_T::Size); // cell + 1 * extrapolationDirection
+
+ // determines if the PDFs of the current cell are also considered
+ const real_t centerFactor = includeThisCell ? real_c(1) : real_c(0);
+
+ // get PDFs
+ pdfsXf = getPdfFunc(cell + Cell(cell_idx_c(1) * extrapolationDirection), pdfField);
+
+ // compute the resulting PDF values of "cell" according to zeroth order extrapolation
+ for (auto dir = Stencil_T::begin(); dir != Stencil_T::end(); ++dir)
+ {
+ pdfField.get(cell, dir.toIdx()) =
+ centerFactor * pdfField.get(cell, dir.toIdx()) + real_c(1) * pdfsXf[dir.toIdx()];
+ }
+}
+
+template< typename LatticeModel_T, typename FlagField_T >
+void EquilibriumRefillingSweep< LatticeModel_T, FlagField_T >::operator()(IBlock* const block)
+{
+ PdfField_T* const pdfField = block->getData< PdfField_T >(RefillingSweepBase_T::pdfFieldID_);
+ const FlagField_T* const flagField = block->getData< const FlagField_T >(RefillingSweepBase_T::flagFieldID_);
+
+ WALBERLA_FOR_ALL_CELLS(pdfFieldIt, pdfField, flagFieldIt, flagField, {
+ if (RefillingSweepBase_T::flagInfo_.hasConvertedFromGasToInterface(flagFieldIt))
+ {
+ const Cell cell = pdfFieldIt.cell();
+
+ Vector3< real_t > avgVelocity;
+ real_t avgDensity;
+ avgDensity = RefillingSweepBase_T::getAverageDensityAndVelocity(cell, *pdfField, *flagField,
+ RefillingSweepBase_T::flagInfo_, avgVelocity);
+
+ pdfField->setDensityAndVelocity(cell, avgVelocity, avgDensity);
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+}
+
+template< typename LatticeModel_T, typename FlagField_T >
+void AverageRefillingSweep< LatticeModel_T, FlagField_T >::operator()(IBlock* const block)
+{
+ PdfField_T* const pdfField = block->getData< PdfField_T >(RefillingSweepBase_T::pdfFieldID_);
+ const FlagField_T* const flagField = block->getData< const FlagField_T >(RefillingSweepBase_T::flagFieldID_);
+
+ WALBERLA_FOR_ALL_CELLS(pdfFieldIt, pdfField, flagFieldIt, flagField, {
+ if (RefillingSweepBase_T::flagInfo_.hasConvertedFromGasToInterface(flagFieldIt))
+ {
+ const Cell cell = pdfFieldIt.cell();
+
+ // compute average PDFs (in each direction) from all applicable neighboring cells
+ const std::vector< real_t > pdfAverage =
+ RefillingSweepBase_T::getAveragePdfs(cell, *pdfField, *flagField, RefillingSweepBase_T::flagInfo_);
+
+ for (auto pdfDir = Stencil_T::begin(); pdfDir != Stencil_T::end(); ++pdfDir)
+ {
+ pdfField->get(cell, *pdfDir) = pdfAverage[pdfDir.toIdx()];
+ }
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+void EquilibriumAndNonEquilibriumRefillingSweep< LatticeModel_T, FlagField_T, ScalarField_T,
+ VectorField_T >::operator()(IBlock* const block)
+{
+ PdfField_T* const pdfField =
+ block->getData< PdfField_T >(ExtrapolationRefillingSweepBase_T::RefillingSweepBase_T::pdfFieldID_);
+ const FlagField_T* const flagField =
+ block->getData< const FlagField_T >(ExtrapolationRefillingSweepBase_T::RefillingSweepBase_T::flagFieldID_);
+ const ScalarField_T* const fillField =
+ block->getData< const ScalarField_T >(ExtrapolationRefillingSweepBase_T::fillFieldID_);
+
+ // function to fetch relevant PDFs
+ auto getPdfFunc = std::bind(&ExtrapolationRefillingSweepBase_T::getNonEquilibriumPdfsInCell, this,
+ std::placeholders::_1, std::placeholders::_2);
+
+ WALBERLA_FOR_ALL_CELLS(pdfFieldIt, pdfField, flagFieldIt, flagField, {
+ if (RefillingSweepBase_T::flagInfo_.hasConvertedFromGasToInterface(flagFieldIt))
+ {
+ const Cell cell = pdfFieldIt.cell();
+
+ // apply EquilibriumRefilling first
+ Vector3< real_t > avgVelocity;
+ real_t avgDensity;
+ avgDensity = RefillingSweepBase_T::getAverageDensityAndVelocity(cell, *pdfField, *flagField,
+ RefillingSweepBase_T::flagInfo_, avgVelocity);
+ pdfField->setDensityAndVelocity(cell, avgVelocity, avgDensity);
+
+ // find valid cells for extrapolation
+ const Vector3< cell_idx_t > extrapolationDirection =
+ ExtrapolationRefillingSweepBase_T::findExtrapolationDirection(cell, *flagField, *fillField);
+ const uint_t numberOfCellsForExtrapolation = ExtrapolationRefillingSweepBase_T::getNumberOfExtrapolationCells(
+ cell, *flagField, *pdfField, extrapolationDirection);
+
+ // add non-equilibrium part of PDF (which might be obtained by extrapolation)
+ if (numberOfCellsForExtrapolation >= uint_c(3))
+ {
+ ExtrapolationRefillingSweepBase_T::applyQuadraticExtrapolation(cell, *pdfField, extrapolationDirection,
+ true, getPdfFunc);
+ }
+ else
+ {
+ if (numberOfCellsForExtrapolation >= uint_c(2))
+ {
+ ExtrapolationRefillingSweepBase_T::applyLinearExtrapolation(cell, *pdfField, extrapolationDirection,
+ true, getPdfFunc);
+ }
+ else
+ {
+ if (numberOfCellsForExtrapolation >= uint_c(1))
+ {
+ ExtrapolationRefillingSweepBase_T::applyConstantExtrapolation(cell, *pdfField, extrapolationDirection,
+ true, getPdfFunc);
+ }
+ // else: do nothing here; this corresponds to using EquilibriumRefilling (done already at the beginning)
+ }
+ }
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+}
+
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+void ExtrapolationRefillingSweep< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >::operator()(
+ IBlock* const block)
+{
+ PdfField_T* const pdfField = block->getData< PdfField_T >(ExtrapolationRefillingSweepBase_T::pdfFieldID_);
+ const FlagField_T* const flagField =
+ block->getData< const FlagField_T >(ExtrapolationRefillingSweepBase_T::flagFieldID_);
+ const ScalarField_T* const fillField =
+ block->getData< const ScalarField_T >(ExtrapolationRefillingSweepBase_T::fillFieldID_);
+
+ WALBERLA_FOR_ALL_CELLS(pdfFieldIt, pdfField, flagFieldIt, flagField, {
+ if (RefillingSweepBase_T::flagInfo_.hasConvertedFromGasToInterface(flagFieldIt))
+ {
+ const Cell cell = pdfFieldIt.cell();
+
+ // find valid cells for extrapolation
+ const Vector3< cell_idx_t > extrapolationDirection =
+ ExtrapolationRefillingSweepBase_T::findExtrapolationDirection(cell, *flagField, *fillField);
+ const uint_t numberOfCellsForExtrapolation = ExtrapolationRefillingSweepBase_T::getNumberOfExtrapolationCells(
+ cell, *flagField, *pdfField, extrapolationDirection);
+
+ // function to fetch relevant PDFs
+ auto getPdfFunc = std::bind(&ExtrapolationRefillingSweepBase_T::getPdfsInCell, this, std::placeholders::_1,
+ std::placeholders::_2);
+
+ if (numberOfCellsForExtrapolation >= uint_c(3))
+ {
+ ExtrapolationRefillingSweepBase_T::applyQuadraticExtrapolation(cell, *pdfField, extrapolationDirection,
+ false, getPdfFunc);
+ }
+ else
+ {
+ if (numberOfCellsForExtrapolation >= uint_c(2))
+ {
+ ExtrapolationRefillingSweepBase_T::applyLinearExtrapolation(cell, *pdfField, extrapolationDirection,
+ false, getPdfFunc);
+ }
+ else
+ {
+ if (numberOfCellsForExtrapolation >= uint_c(1))
+ {
+ ExtrapolationRefillingSweepBase_T::applyConstantExtrapolation(cell, *pdfField, extrapolationDirection,
+ false, getPdfFunc);
+ }
+ else
+ {
+ // if not enough cells for extrapolation are available, use EquilibriumRefilling
+ Vector3< real_t > avgVelocity;
+ real_t avgDensity;
+ avgDensity = RefillingSweepBase_T::getAverageDensityAndVelocity(
+ cell, *pdfField, *flagField, RefillingSweepBase_T::flagInfo_, avgVelocity);
+ pdfField->setDensityAndVelocity(cell, avgVelocity, avgDensity);
+ }
+ }
+ }
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+}
+
+template< typename LatticeModel_T, typename FlagField_T >
+Vector3< real_t > GradsMomentsRefillingSweep< LatticeModel_T, FlagField_T >::getVelocityGradient(
+ stencil::Direction direction, const Cell& cell, const PdfField_T* pdfField, const Vector3< real_t >& avgVelocity,
+ const std::vector< bool >& validStencilIndices)
+{
+ stencil::Direction dir;
+ stencil::Direction invDir;
+
+ switch (direction)
+ {
+ case stencil::E:
+ case stencil::W:
+ dir = stencil::E;
+ invDir = stencil::W;
+ break;
+ case stencil::N:
+ case stencil::S:
+ dir = stencil::N;
+ invDir = stencil::S;
+ break;
+ case stencil::T:
+ case stencil::B:
+ dir = stencil::T;
+ invDir = stencil::B;
+ break;
+ default:
+ WALBERLA_ABORT("Velocity gradient for GradsMomentsRefilling can not be computed in a direction other than in x-, "
+ "y-, or z-direction.");
+ }
+
+ Vector3< real_t > velocityGradient(real_c(0));
+
+ // apply central finite differences if both neighboring cells are available
+ if (validStencilIndices[Stencil_T::idx[dir]] && validStencilIndices[Stencil_T::idx[invDir]])
+ {
+ const Vector3< real_t > neighborVelocity1 = pdfField->getVelocity(cell + dir);
+ const Vector3< real_t > neighborVelocity2 = pdfField->getVelocity(cell + invDir);
+ velocityGradient[0] = real_c(0.5) * (neighborVelocity1[0] - neighborVelocity2[0]); // assuming dx = 1
+ velocityGradient[1] = real_c(0.5) * (neighborVelocity1[1] - neighborVelocity2[1]); // assuming dx = 1
+ velocityGradient[2] = real_c(0.5) * (neighborVelocity1[2] - neighborVelocity2[2]); // assuming dx = 1
+ }
+ else
+ {
+ // apply first order upwind scheme
+ stencil::Direction upwindDirection = (avgVelocity[0] > real_c(0)) ? invDir : dir;
+
+ stencil::Direction sourceDirection = stencil::C; // arbitrary default initialization
+
+ if (validStencilIndices[Stencil_T::idx[upwindDirection]]) { sourceDirection = upwindDirection; }
+ else
+ {
+ if (validStencilIndices[Stencil_T::idx[stencil::inverseDir[upwindDirection]]])
+ {
+ sourceDirection = stencil::inverseDir[upwindDirection];
+ }
+ }
+
+ if (sourceDirection == dir)
+ {
+ auto neighborVelocity = pdfField->getVelocity(cell + sourceDirection);
+ velocityGradient[0] = neighborVelocity[0] - avgVelocity[0]; // assuming dx = 1
+ velocityGradient[1] = neighborVelocity[1] - avgVelocity[1]; // assuming dx = 1
+ velocityGradient[2] = neighborVelocity[2] - avgVelocity[2]; // assuming dx = 1
+ }
+ else
+ {
+ if (sourceDirection == invDir)
+ {
+ auto neighborVelocity = pdfField->getVelocity(cell + sourceDirection);
+ velocityGradient[0] = avgVelocity[0] - neighborVelocity[0]; // assuming dx = 1
+ velocityGradient[1] = avgVelocity[1] - neighborVelocity[1]; // assuming dx = 1
+ velocityGradient[2] = avgVelocity[2] - neighborVelocity[2]; // assuming dx = 1
+ }
+ // else: no stencil direction is valid, velocityGradient is zero
+ }
+ }
+
+ return velocityGradient;
+}
+
+template< typename LatticeModel_T, typename FlagField_T >
+void GradsMomentsRefillingSweep< LatticeModel_T, FlagField_T >::operator()(IBlock* const block)
+{
+ PdfField_T* pdfField = block->getData< PdfField_T >(RefillingSweepBase_T::pdfFieldID_);
+ const FlagField_T* const flagField = block->getData< const FlagField_T >(RefillingSweepBase_T::flagFieldID_);
+
+ WALBERLA_FOR_ALL_CELLS(pdfFieldIt, pdfField, flagFieldIt, flagField, {
+ if (RefillingSweepBase_T::flagInfo_.hasConvertedFromGasToInterface(flagFieldIt))
+ {
+ const Cell cell = pdfFieldIt.cell();
+
+ // get average density and velocity from valid neighboring cells and store the directions of valid neighbors
+ std::vector< bool > validStencilIndices(Stencil_T::Size, false);
+ Vector3< real_t > avgVelocity;
+ real_t avgDensity;
+ avgDensity = RefillingSweepBase_T::getAverageDensityAndVelocity(
+ cell, *pdfField, *flagField, RefillingSweepBase_T::flagInfo_, avgVelocity, validStencilIndices);
+
+ // get velocity gradients
+ // - using a first order central finite differences (if two neighboring cells are available)
+ // - using a first order upwind scheme (if only one neighboring cell is available)
+ // - assuming a zero gradient if no valid neighboring cell is available
+ // velocityGradient(u) =
+ // | du1/dx1 du2/dx1 du3/dx1 | | 0 1 2 | | 0,0 0,1 0,2 |
+ // | du1/dx2 du2/dx2 du3/dx2 | = | 3 4 5 | = | 1,0 1,1 1,2 |
+ // | du1/dx3 du2/dx3 du3/dx3 | | 6 7 8 | | 2,0 2,1 2,2 |
+ const Vector3< real_t > gradientX =
+ getVelocityGradient(stencil::E, cell, pdfField, avgVelocity, validStencilIndices);
+ const Vector3< real_t > gradientY =
+ getVelocityGradient(stencil::N, cell, pdfField, avgVelocity, validStencilIndices);
+ Vector3< real_t > gradientZ = Vector3< real_t >(real_c(0));
+ if (Stencil_T::D == 3)
+ {
+ gradientZ = getVelocityGradient(stencil::T, cell, pdfField, avgVelocity, validStencilIndices);
+ }
+
+ Matrix3< real_t > velocityGradient(gradientX, gradientY, gradientZ);
+
+ // compute non-equilibrium pressure tensor (equation (13) in Dorschner et al.); rho is not included in the
+ // pre-factor here, but will be considered later
+ Matrix3< real_t > pressureTensorNeq(real_c(0));
+
+ // in equation (13) in Dorschner et al., 2*beta is used in the pre-factor; note that 2*beta=omega (relaxation
+ // rate related to kinematic viscosity)
+ const real_t preFac = -real_c(1) / (real_c(3) * relaxRate_);
+
+ for (uint_t j = uint_c(0); j != uint_c(3); ++j)
+ {
+ for (uint_t i = uint_c(0); i != uint_c(3); ++i)
+ {
+ pressureTensorNeq(i, j) += preFac * (velocityGradient(i, j) + velocityGradient(j, i));
+ }
+ }
+
+ // set PDFs according to equation (10) in Dorschner et al.; this is equivalent to setting the PDFs to
+ // equilibrium f^{eq} and adding a contribution of the non-equilibrium pressure tensor P^{neq}
+ for (auto q = Stencil_T::begin(); q != Stencil_T::end(); ++q)
+ {
+ const real_t velCi = lbm::internal::multiplyVelocityDirection(*q, avgVelocity);
+
+ real_t contributionFromPneq = real_c(0);
+ for (uint_t j = uint_c(0); j != uint_c(3); ++j)
+ {
+ for (uint_t i = uint_c(0); i != uint_c(3); ++i)
+ {
+ // P^{neq}_{a,b} * c_{q,a} * c_{q,b}
+ contributionFromPneq +=
+ pressureTensorNeq(i, j) * real_c(stencil::c[i][*q]) * real_c(stencil::c[j][*q]);
+ }
+ }
+
+ // - P^{neq}_{a,b} * cs^2 * delta_{a,b}
+ contributionFromPneq -=
+ (pressureTensorNeq(0, 0) + pressureTensorNeq(1, 1) + pressureTensorNeq(2, 2)) / real_c(3);
+
+ // compute f^{eq} and add contribution from P^{neq}
+ const real_t pdf = LatticeModel_T::w[q.toIdx()] * avgDensity *
+ (real_c(1) + real_c(3) * velCi - real_c(1.5) * avgVelocity.sqrLength() +
+ real_c(4.5) * velCi * velCi + real_c(4.5) * contributionFromPneq);
+ pdfField->get(cell, *q) = pdf;
+ }
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+}
+
+} // namespace free_surface
+} // namespace walberla
\ No newline at end of file
diff --git a/src/lbm/free_surface/dynamics/StreamReconstructAdvectSweep.h b/src/lbm/free_surface/dynamics/StreamReconstructAdvectSweep.h
new file mode 100644
index 0000000000000000000000000000000000000000..ec5ca220d3d9d3cfa5dcc20de3ba02b3dd0f4155
--- /dev/null
+++ b/src/lbm/free_surface/dynamics/StreamReconstructAdvectSweep.h
@@ -0,0 +1,202 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file StreamReconstructAdvectSweep.h
+//! \ingroup free_surface
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Sweep for reconstruction of PDFs, streaming of PDFs (only in interface cells), advection of mass, update of
+//! bubble volumes and marking interface cells for conversion.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/DataTypes.h"
+#include "core/math/Vector3.h"
+#include "core/mpi/Reduce.h"
+#include "core/timing/TimingPool.h"
+
+#include "field/FieldClone.h"
+#include "field/FlagField.h"
+
+#include "lbm/free_surface/FlagInfo.h"
+#include "lbm/free_surface/bubble_model/BubbleModel.h"
+#include "lbm/sweeps/StreamPull.h"
+
+#include "PdfReconstructionModel.h"
+#include "functionality/AdvectMass.h"
+#include "functionality/FindInterfaceCellConversion.h"
+#include "functionality/GetOredNeighborhood.h"
+#include "functionality/ReconstructInterfaceCellABB.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+template< typename LatticeModel_T, typename BoundaryHandling_T, typename FlagField_T, typename FlagInfo_T,
+ typename ScalarField_T, typename VectorField_T, bool useCodegen >
+class StreamReconstructAdvectSweep
+{
+ public:
+ using flag_t = typename FlagInfo_T::flag_t;
+ using PdfField_T = lbm::PdfField< LatticeModel_T >;
+
+ StreamReconstructAdvectSweep(real_t sigma, BlockDataID handlingID, BlockDataID fillFieldID, BlockDataID flagFieldID,
+ BlockDataID pdfField, ConstBlockDataID normalFieldID, ConstBlockDataID curvatureFieldID,
+ const FlagInfo_T& flagInfo, BubbleModelBase* bubbleModel,
+ const PdfReconstructionModel& pdfReconstructionModel, bool useSimpleMassExchange,
+ real_t cellConversionThreshold, real_t cellConversionForceThreshold)
+ : sigma_(sigma), handlingID_(handlingID), fillFieldID_(fillFieldID), flagFieldID_(flagFieldID),
+ pdfFieldID_(pdfField), normalFieldID_(normalFieldID), curvatureFieldID_(curvatureFieldID), flagInfo_(flagInfo),
+ bubbleModel_(bubbleModel), neighborhoodFlagFieldClone_(flagFieldID), fillFieldClone_(fillFieldID),
+ pdfFieldClone_(pdfField), pdfReconstructionModel_(pdfReconstructionModel),
+ useSimpleMassExchange_(useSimpleMassExchange), cellConversionThreshold_(cellConversionThreshold),
+ cellConversionForceThreshold_(cellConversionForceThreshold)
+ {}
+
+ void operator()(IBlock* const block);
+
+ protected:
+ real_t sigma_; // surface tension
+
+ BlockDataID handlingID_;
+ BlockDataID fillFieldID_;
+ BlockDataID flagFieldID_;
+ BlockDataID pdfFieldID_;
+
+ ConstBlockDataID normalFieldID_;
+ ConstBlockDataID curvatureFieldID_;
+
+ FlagInfo_T flagInfo_;
+ bubble_model::BubbleModelBase* const bubbleModel_;
+
+ // efficient clones of fields to provide temporary fields (for writing to)
+ field::FieldClone< FlagField_T, true > neighborhoodFlagFieldClone_;
+ field::FieldClone< ScalarField_T, true > fillFieldClone_;
+ field::FieldClone< PdfField_T, true > pdfFieldClone_;
+
+ PdfReconstructionModel pdfReconstructionModel_;
+ bool useSimpleMassExchange_;
+ real_t cellConversionThreshold_;
+ real_t cellConversionForceThreshold_;
+}; // class StreamReconstructAdvectSweep
+
+template< typename LatticeModel_T, typename BoundaryHandling_T, typename FlagField_T, typename FlagInfo_T,
+ typename ScalarField_T, typename VectorField_T, bool useCodegen >
+void StreamReconstructAdvectSweep< LatticeModel_T, BoundaryHandling_T, FlagField_T, FlagInfo_T, ScalarField_T,
+ VectorField_T, useCodegen >::operator()(IBlock* const block)
+{
+ // fetch data
+ ScalarField_T* const fillSrcField = block->getData< ScalarField_T >(fillFieldID_);
+ PdfField_T* const pdfSrcField = block->getData< PdfField_T >(pdfFieldID_);
+
+ const ScalarField_T* const curvatureField = block->getData< const ScalarField_T >(curvatureFieldID_);
+ const VectorField_T* const normalField = block->getData< const VectorField_T >(normalFieldID_);
+ FlagField_T* const flagField = block->getData< FlagField_T >(flagFieldID_);
+
+ // temporary fields that act as destination fields
+ PdfField_T* const pdfDstField = pdfFieldClone_.get(block);
+ FlagField_T* const neighborhoodFlagField = neighborhoodFlagFieldClone_.get(block);
+ ScalarField_T* const fillDstField = fillFieldClone_.get(block);
+
+ // combine all neighbor flags using bitwise OR and write them to the neighborhood field
+ // this is simply a pre-computation of often required values
+ // IMPORTANT REMARK: the "OredNeighborhood" is also required for each cell in the first ghost layer; this requires
+ // access to all first ghost layer cell's neighbors (i.e., to the second ghost layer)
+ WALBERLA_CHECK_GREATER_EQUAL(flagField->nrOfGhostLayers(), uint_c(2));
+ getOredNeighborhood< typename LatticeModel_T::Stencil >(flagField, neighborhoodFlagField);
+
+ // explicitly avoid OpenMP due to bubble model update (reportFillLevelChange)
+ WALBERLA_FOR_ALL_CELLS_OMP(
+ pdfDstFieldIt, pdfDstField, pdfSrcFieldIt, pdfSrcField, fillSrcFieldIt, fillSrcField, fillDstFieldIt,
+ fillDstField, flagFieldIt, flagField, neighborhoodFlagFieldIt, neighborhoodFlagField, normalFieldIt, normalField,
+ curvatureFieldIt, curvatureField, omp critical, {
+ if (flagInfo_.isInterface(flagFieldIt))
+ {
+ // get density (rhoGas) for interface PDF reconstruction
+ const real_t bubbleDensity = bubbleModel_->getDensity(block, pdfSrcFieldIt.cell());
+ const real_t rhoGas = computeDeltaRhoLaplacePressure(sigma_, *curvatureFieldIt) + bubbleDensity;
+
+ // reconstruct missing PDFs coming from gas neighbors according to the specified model (see dissertation of
+ // N. Thuerey, 2007, section 4.2); reconstruction includes streaming of PDFs to interface cells (no LBM
+ // stream required here)
+ (reconstructInterfaceCellLegacy< LatticeModel_T, FlagField_T >) (flagField, pdfSrcFieldIt, flagFieldIt,
+ normalFieldIt, flagInfo_, rhoGas,
+ pdfDstFieldIt, pdfReconstructionModel_);
+
+ // density before LBM stream (post-collision)
+ const real_t oldRho = lbm::getDensity(pdfSrcField->latticeModel(), pdfSrcFieldIt);
+
+ // density after LBM stream in reconstruction
+ const real_t newRho = lbm::getDensity(pdfDstField->latticeModel(), pdfDstFieldIt);
+
+ // compute mass advection using post-collision PDFs (explicitly not PDFs updated by stream above)
+ const real_t deltaMass =
+ (advectMass< LatticeModel_T, FlagField_T, typename ScalarField_T::iterator,
+ typename PdfField_T::iterator, typename FlagField_T::iterator,
+ typename FlagField_T::iterator, FlagInfo_T >) (flagField, fillSrcFieldIt, pdfSrcFieldIt,
+ flagFieldIt, neighborhoodFlagFieldIt,
+ flagInfo_, useSimpleMassExchange_);
+
+ // update fill level after LBM stream and mass exchange
+ *fillDstFieldIt = (*fillSrcFieldIt * oldRho + deltaMass) / newRho;
+ const real_t deltaFill = *fillDstFieldIt - *fillSrcFieldIt;
+
+ // update the volume of bubbles
+ bubbleModel_->reportFillLevelChange(block, fillSrcFieldIt.cell(), deltaFill);
+ }
+ else // treat non-interface cells
+ {
+ // manually adjust the fill level to avoid outdated fill levels being copied from fillSrcField
+ if (flagInfo_.isGas(flagFieldIt)) { *fillDstFieldIt = real_c(0); }
+ else
+ {
+ if (flagInfo_.isLiquid(flagFieldIt))
+ {
+ const Cell cell = pdfSrcFieldIt.cell();
+ if constexpr (useCodegen)
+ {
+ auto lbmSweepGenerated = typename LatticeModel_T::Sweep(pdfFieldID_);
+ const CellInterval ci(cell, cell);
+ lbmSweepGenerated.streamInCellInterval(pdfSrcField, pdfDstField, ci);
+ }
+ else
+ {
+ lbm::StreamPull< LatticeModel_T >::execute(pdfSrcField, pdfDstField, cell[0], cell[1], cell[2]);
+ }
+
+ *fillDstFieldIt = real_c(1);
+ }
+ else // flag is e.g. obstacle or outflow
+ {
+ *fillDstFieldIt = *fillSrcFieldIt;
+ }
+ }
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_XYZ_OMP
+
+ pdfSrcField->swapDataPointers(pdfDstField);
+ fillSrcField->swapDataPointers(fillDstField);
+
+ BoundaryHandling_T* const handling = block->getData< BoundaryHandling_T >(handlingID_);
+
+ // mark interface cell for conversion
+ findInterfaceCellConversions< LatticeModel_T >(handling, fillSrcField, flagField, neighborhoodFlagField, flagInfo_,
+ cellConversionThreshold_, cellConversionForceThreshold_);
+}
+
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/dynamics/SurfaceDynamicsHandler.h b/src/lbm/free_surface/dynamics/SurfaceDynamicsHandler.h
new file mode 100644
index 0000000000000000000000000000000000000000..c0489961ab14243c568471d1c3d48621fb5dacc0
--- /dev/null
+++ b/src/lbm/free_surface/dynamics/SurfaceDynamicsHandler.h
@@ -0,0 +1,441 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file SurfaceDynamicsHandler.h
+//! \ingroup surface_dynamics
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Handles the free surface dynamics (mass advection, LBM, boundary condition, cell conversion etc.).
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/DataTypes.h"
+
+#include "domain_decomposition/StructuredBlockStorage.h"
+
+#include "field/AddToStorage.h"
+#include "field/FlagField.h"
+
+#include "lbm/blockforest/communication/SimpleCommunication.h"
+#include "lbm/blockforest/communication/UpdateSecondGhostLayer.h"
+#include "lbm/free_surface/BlockStateDetectorSweep.h"
+#include "lbm/free_surface/FlagInfo.h"
+#include "lbm/free_surface/boundary/FreeSurfaceBoundaryHandling.h"
+#include "lbm/free_surface/bubble_model/BubbleModel.h"
+#include "lbm/lattice_model/SmagorinskyLES.h"
+#include "lbm/sweeps/CellwiseSweep.h"
+#include "lbm/sweeps/SweepWrappers.h"
+
+#include "stencil/D3Q27.h"
+
+#include "timeloop/SweepTimeloop.h"
+
+#include "CellConversionSweep.h"
+#include "ConversionFlagsResetSweep.h"
+#include "ExcessMassDistributionModel.h"
+#include "ExcessMassDistributionSweep.h"
+#include "ForceWeightingSweep.h"
+#include "PdfReconstructionModel.h"
+#include "PdfRefillingModel.h"
+#include "PdfRefillingSweep.h"
+#include "StreamReconstructAdvectSweep.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T,
+ bool useCodegen = false >
+class SurfaceDynamicsHandler
+{
+ protected:
+ using Communication_T = blockforest::SimpleCommunication< typename LatticeModel_T::Stencil >;
+
+ // communication in corner directions (D2Q9/D3Q27) is required for all fields but the PDF field
+ using CommunicationStencil_T =
+ typename std::conditional< LatticeModel_T::Stencil::D == uint_t(2), stencil::D2Q9, stencil::D3Q27 >::type;
+ using CommunicationCorner_T = blockforest::SimpleCommunication< CommunicationStencil_T >;
+
+ using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+ public:
+ SurfaceDynamicsHandler(const std::shared_ptr< StructuredBlockForest >& blockForest, BlockDataID pdfFieldID,
+ BlockDataID flagFieldID, BlockDataID fillFieldID, BlockDataID forceFieldID,
+ ConstBlockDataID normalFieldID, ConstBlockDataID curvatureFieldID,
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T >& freeSurfaceBoundaryHandling,
+ const std::shared_ptr< BubbleModelBase >& bubbleModel,
+ const std::string& pdfReconstructionModel, const std::string& pdfRefillingModel,
+ const std::string& excessMassDistributionModel, real_t relaxationRate,
+ const Vector3< real_t >& globalForce, real_t surfaceTension, bool enableForceWeighting,
+ bool useSimpleMassExchange, real_t cellConversionThreshold,
+ real_t cellConversionForceThreshold, BlockDataID relaxationRateFieldID = BlockDataID(),
+ real_t smagorinskyConstant = real_c(0))
+ : blockForest_(blockForest), pdfFieldID_(pdfFieldID), flagFieldID_(flagFieldID), fillFieldID_(fillFieldID),
+ forceFieldID_(forceFieldID), normalFieldID_(normalFieldID), curvatureFieldID_(curvatureFieldID),
+ bubbleModel_(bubbleModel), freeSurfaceBoundaryHandling_(freeSurfaceBoundaryHandling),
+ pdfReconstructionModel_(pdfReconstructionModel), pdfRefillingModel_({ pdfRefillingModel }),
+ excessMassDistributionModel_({ excessMassDistributionModel }), relaxationRate_(relaxationRate),
+ globalForce_(globalForce), surfaceTension_(surfaceTension), enableForceWeighting_(enableForceWeighting),
+ useSimpleMassExchange_(useSimpleMassExchange), cellConversionThreshold_(cellConversionThreshold),
+ cellConversionForceThreshold_(cellConversionForceThreshold), relaxationRateFieldID_(relaxationRateFieldID),
+ smagorinskyConstant_(smagorinskyConstant)
+ {
+ WALBERLA_CHECK(LatticeModel_T::compressible,
+ "The free surface lattice Boltzmann extension works only with compressible LBM models.");
+
+ if (useCodegen && !realIsEqual(smagorinskyConstant_, real_c(0)))
+ {
+ WALBERLA_ABORT("When using a generated LBM kernel from lbmpy, please use lbmpy's inbuilt-functionality to "
+ "generate the Smagorinsky model directly into the kernel.");
+ }
+
+ if (excessMassDistributionModel_.isEvenlyLiquidAndAllInterfacePreferInterfaceType())
+ {
+ // add additional field for storing excess mass in liquid cells
+ excessMassFieldID_ =
+ field::addToStorage< ScalarField_T >(blockForest_, "Excess mass", real_c(0), field::fzyx, uint_c(1));
+ }
+
+ if (LatticeModel_T::Stencil::D == uint_t(2))
+ {
+ WALBERLA_LOG_INFO_ON_ROOT(
+ "IMPORTANT REMARK: You are using a D2Q9 stencil in SurfaceDynamicsHandler. In the FSLBM, a D2Q9 setup is "
+ "not identical to a D3Q19 setup with periodicity in the third direction but only identical to the same "
+ "D3Q27 setup. This comes from the distribution of excess mass, where the number of available neighbors "
+ "differs for D2Q9 and a periodic D3Q19 setup.")
+ }
+ }
+
+ ConstBlockDataID getConstExcessMassFieldID() const { return excessMassFieldID_; }
+
+ /********************************************************************************************************************
+ * The order of these sweeps is similar to page 40 in the dissertation of T. Pohl, 2008.
+ *******************************************************************************************************************/
+ void addSweeps(SweepTimeloop& timeloop) const
+ {
+ using StateSweep = BlockStateDetectorSweep< FlagField_T >;
+
+ const auto& flagInfo = freeSurfaceBoundaryHandling_->getFlagInfo();
+
+ const auto blockStateUpdate = StateSweep(blockForest_, flagInfo, flagFieldID_);
+
+ // empty sweeps required for using selectors (e.g. StateSweep::onlyGasAndBoundary)
+ const auto emptySweep = [](IBlock*) {};
+
+ // add standard waLBerla boundary handling
+ timeloop.add() << Sweep(freeSurfaceBoundaryHandling_->getBoundarySweep(), "Sweep: boundary handling",
+ Set< SUID >::emptySet(), StateSweep::onlyGasAndBoundary)
+ << Sweep(emptySweep, "Empty sweep: boundary handling", StateSweep::onlyGasAndBoundary);
+
+ if (enableForceWeighting_)
+ {
+ // add sweep for weighting force in interface cells with fill level and density
+ const ForceWeightingSweep< LatticeModel_T, FlagField_T, VectorField_T, ScalarField_T > forceWeightingSweep(
+ forceFieldID_, pdfFieldID_, flagFieldID_, fillFieldID_, flagInfo, globalForce_);
+ timeloop.add() << Sweep(forceWeightingSweep, "Sweep: force weighting", Set< SUID >::emptySet(),
+ StateSweep::onlyGasAndBoundary)
+ << Sweep(emptySweep, "Empty sweep: force weighting", StateSweep::onlyGasAndBoundary)
+ << AfterFunction(CommunicationCorner_T(blockForest_, forceFieldID_),
+ "Communication: after force weighting sweep");
+ }
+
+ // sweep for
+ // - reconstruction of PDFs in interface cells
+ // - streaming of PDFs in interface cells (and liquid cells on the same block)
+ // - advection of mass
+ // - update bubble volumes
+ // - marking interface cells for conversion
+ const StreamReconstructAdvectSweep< LatticeModel_T, typename FreeSurfaceBoundaryHandling_T::BoundaryHandling_T,
+ FlagField_T, typename FreeSurfaceBoundaryHandling_T::FlagInfo_T,
+ ScalarField_T, VectorField_T, useCodegen >
+ streamReconstructAdvectSweep(surfaceTension_, freeSurfaceBoundaryHandling_->getHandlingID(), fillFieldID_,
+ flagFieldID_, pdfFieldID_, normalFieldID_, curvatureFieldID_, flagInfo,
+ bubbleModel_.get(), pdfReconstructionModel_, useSimpleMassExchange_,
+ cellConversionThreshold_, cellConversionForceThreshold_);
+ // sweep acts only on blocks with at least one interface cell (due to StateSweep::fullFreeSurface)
+ timeloop.add()
+ << Sweep(streamReconstructAdvectSweep, "Sweep: StreamReconstructAdvect", StateSweep::fullFreeSurface)
+ << Sweep(emptySweep, "Empty sweep: StreamReconstructAdvect")
+ // do not communicate PDFs here:
+ // - stream on blocks with "StateSweep::fullFreeSurface" was performed here using post-collision PDFs
+ // - stream on other blocks is performed below and should also use post-collision PDFs
+ // => if PDFs were communicated here, the ghost layer of other blocks would have post-stream PDFs
+ << AfterFunction(CommunicationCorner_T(blockForest_, fillFieldID_, flagFieldID_),
+ "Communication: after StreamReconstructAdvect sweep")
+ << AfterFunction(blockforest::UpdateSecondGhostLayer< ScalarField_T >(blockForest_, fillFieldID_),
+ "Second ghost layer update: after StreamReconstructAdvect sweep (fill level field)")
+ << AfterFunction(blockforest::UpdateSecondGhostLayer< FlagField_T >(blockForest_, flagFieldID_),
+ "Second ghost layer update: after StreamReconstructAdvect sweep (flag field)");
+
+ if constexpr (useCodegen)
+ {
+ auto lbmSweepGenerated = typename LatticeModel_T::Sweep(pdfFieldID_);
+
+ // temporary class for being able to call the LBM collision with operator()
+ class CollideSweep
+ {
+ public:
+ CollideSweep(const typename LatticeModel_T::Sweep& sweep) : sweep_(sweep){};
+
+ void operator()(IBlock* const block, const uint_t numberOfGhostLayersToInclude = uint_t(1))
+ {
+ sweep_.collide(block, numberOfGhostLayersToInclude);
+ }
+
+ private:
+ typename LatticeModel_T::Sweep sweep_;
+ };
+
+ timeloop.add() << Sweep(CollideSweep(lbmSweepGenerated), "Sweep: collision (generated)",
+ StateSweep::fullFreeSurface)
+ << Sweep(lbmSweepGenerated, "Sweep: streamCollide (generated)", StateSweep::onlyLBM)
+ << Sweep(emptySweep, "Empty sweep: streamCollide (generated)")
+ << AfterFunction(Communication_T(blockForest_, pdfFieldID_),
+ "Communication: after streamCollide (generated)");
+ }
+ else
+ {
+ // sweep for standard LBM stream and collision
+ const auto lbmSweep = lbm::makeCellwiseSweep< LatticeModel_T, FlagField_T >(pdfFieldID_, flagFieldID_,
+ flagIDs::liquidInterfaceFlagIDs);
+
+ // LBM collision in interface cells; standard LBM stream and collision in liquid cells
+ if (!realIsEqual(smagorinskyConstant_, real_c(0), real_c(1e-14))) // using Smagorinsky turbulence model
+ {
+ const real_t kinematicViscosity = (real_c(1) / relaxationRate_ - real_c(0.5)) / real_c(3);
+
+ // standard LBM stream in liquid cells that have not been streamed, yet
+ timeloop.add() << Sweep(lbm::makeStreamSweep(lbmSweep), "Stream sweep", StateSweep::onlyLBM)
+ << Sweep(emptySweep, "Deactivated Stream sweep")
+ << AfterFunction(Communication_T(blockForest_, pdfFieldID_),
+ "Communication after Stream sweep");
+
+ // sweep for turbulence modelling
+ const lbm::SmagorinskyLES< LatticeModel_T > smagorinskySweep(
+ blockForest_, pdfFieldID_, relaxationRateFieldID_, kinematicViscosity, real_c(0.12));
+
+ timeloop.add()
+ // Smagorinsky turbulence model
+ << BeforeFunction(smagorinskySweep, "Sweep: Smagorinsky turbulence model")
+ << BeforeFunction(CommunicationCorner_T(blockForest_, relaxationRateFieldID_),
+ "Communication: after Smagorinsky sweep")
+ // standard LBM collision
+ << Sweep(lbm::makeCollideSweep(lbmSweep), "Sweep: collision after Smagorinsky sweep")
+ << AfterFunction(Communication_T(blockForest_, pdfFieldID_),
+ "Communication: after collision sweep with preceding Smagorinsky sweep");
+ }
+ else
+ {
+ // no turbulence model
+ timeloop.add()
+ // collision in interface cells and liquid cells that have already been streamed (in
+ // streamReconstructAdvectSweep due to StateSweep::fullFreeSurface)
+ << Sweep(lbm::makeCollideSweep(lbmSweep), "Sweep: collision", StateSweep::fullFreeSurface)
+ // standard LBM stream-collide in liquid cells that have not been streamed, yet
+ << Sweep(*lbmSweep, "Sweep: streamCollide", StateSweep::onlyLBM)
+ << Sweep(emptySweep, "Empty sweep: streamCollide")
+ << AfterFunction(Communication_T(blockForest_, pdfFieldID_), "Communication: after streamCollide sweep");
+ }
+ }
+
+ // convert cells
+ // - according to the flags from StreamReconstructAdvectSweep (interface -> gas/liquid)
+ // - to ensure a closed layer of interface cells (gas/liquid -> interface)
+ // - detect and register bubble merges/splits (bubble volumes are already updated in StreamReconstructAdvectSweep)
+ // - convert cells and initialize PDFs near inflow boundaries
+ const CellConversionSweep< LatticeModel_T, typename FreeSurfaceBoundaryHandling_T::BoundaryHandling_T,
+ ScalarField_T >
+ cellConvSweep(freeSurfaceBoundaryHandling_->getHandlingID(), pdfFieldID_, flagInfo, bubbleModel_.get());
+ timeloop.add() << Sweep(cellConvSweep, "Sweep: cell conversion", StateSweep::fullFreeSurface)
+ << Sweep(emptySweep, "Empty sweep: cell conversion")
+ << AfterFunction(Communication_T(blockForest_, pdfFieldID_),
+ "Communication: after cell conversion sweep (PDF field)")
+ // communicate the flag field also in corner directions
+ << AfterFunction(CommunicationCorner_T(blockForest_, flagFieldID_),
+ "Communication: after cell conversion sweep (flag field)")
+ << AfterFunction(blockforest::UpdateSecondGhostLayer< FlagField_T >(blockForest_, flagFieldID_),
+ "Second ghost layer update: after cell conversion sweep (flag field)");
+
+ // reinitialize PDFs, i.e., refill cells that were converted from gas to interface
+ // - when the flag "convertedFromGasToInterface" has been set (by CellConversionSweep)
+ // - according to the method specified with pdfRefillingModel_
+ switch (pdfRefillingModel_.getModelType())
+ { // the scope for each "case" is required since variables are defined within "case"
+ case PdfRefillingModel::RefillingModel::EquilibriumRefilling: {
+ const EquilibriumRefillingSweep< LatticeModel_T, FlagField_T > equilibriumRefillingSweep(
+ pdfFieldID_, flagFieldID_, flagInfo, true);
+ timeloop.add() << Sweep(equilibriumRefillingSweep, "Sweep: EquilibriumRefilling", StateSweep::fullFreeSurface)
+ << Sweep(emptySweep, "Empty sweep: EquilibriumRefilling")
+ << AfterFunction(Communication_T(blockForest_, pdfFieldID_),
+ "Communication: after EquilibriumRefilling sweep");
+ break;
+ }
+ case PdfRefillingModel::RefillingModel::AverageRefilling: {
+ const AverageRefillingSweep< LatticeModel_T, FlagField_T > averageRefillingSweep(pdfFieldID_, flagFieldID_,
+ flagInfo, true);
+ timeloop.add() << Sweep(averageRefillingSweep, "Sweep: AverageRefilling", StateSweep::fullFreeSurface)
+ << Sweep(emptySweep, "Empty sweep: AverageRefilling")
+ << AfterFunction(Communication_T(blockForest_, pdfFieldID_),
+ "Communication: after AverageRefilling sweep");
+ break;
+ }
+ case PdfRefillingModel::RefillingModel::EquilibriumAndNonEquilibriumRefilling: {
+ // default: extrapolation order: 0
+ const EquilibriumAndNonEquilibriumRefillingSweep< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >
+ equilibriumAndNonEquilibriumRefillingSweep(pdfFieldID_, flagFieldID_, fillFieldID_, flagInfo, uint_c(0),
+ true);
+ timeloop.add() << Sweep(equilibriumAndNonEquilibriumRefillingSweep,
+ "Sweep: EquilibriumAndNonEquilibriumRefilling sweep", StateSweep::fullFreeSurface)
+ << Sweep(emptySweep, "Empty sweep: EquilibriumAndNonEquilibriumRefilling")
+ << AfterFunction(Communication_T(blockForest_, pdfFieldID_),
+ "Communication: after EquilibriumAndNonEquilibriumRefilling sweep");
+ break;
+ }
+ case PdfRefillingModel::RefillingModel::ExtrapolationRefilling: {
+ // default: extrapolation order: 2
+ const ExtrapolationRefillingSweep< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >
+ extrapolationRefillingSweep(pdfFieldID_, flagFieldID_, fillFieldID_, flagInfo, uint_c(2), true);
+ timeloop.add() << Sweep(extrapolationRefillingSweep, "Sweep: ExtrapolationRefilling",
+ StateSweep::fullFreeSurface)
+ << Sweep(emptySweep, "Empty sweep: ExtrapolationRefilling")
+ << AfterFunction(Communication_T(blockForest_, pdfFieldID_),
+ "Communication: after ExtrapolationRefilling sweep");
+ break;
+ }
+ case PdfRefillingModel::RefillingModel::GradsMomentsRefilling: {
+ const GradsMomentsRefillingSweep< LatticeModel_T, FlagField_T > gradsMomentRefillingSweep(
+ pdfFieldID_, flagFieldID_, flagInfo, relaxationRate_, true);
+ timeloop.add() << Sweep(gradsMomentRefillingSweep, "Sweep: GradsMomentRefilling", StateSweep::fullFreeSurface)
+ << Sweep(emptySweep, "Empty sweep: GradsMomentRefilling")
+ << AfterFunction(Communication_T(blockForest_, pdfFieldID_),
+ "Communication: after GradsMomentRefilling sweep");
+ break;
+ }
+ default:
+ WALBERLA_ABORT("The specified pdf refilling model is not available.");
+ }
+
+ // distribute excess mass:
+ // - excess mass: mass that is free after conversion from interface to gas/liquid cells
+ // - update the bubble model
+ // IMPORTANT REMARK: this sweep computes the mass via the density, i.e., the PDF field must be up-to-date and the
+ // PdfRefillingSweep must have been performed
+ if (excessMassDistributionModel_.isEvenlyType())
+ {
+ const ExcessMassDistributionSweepInterfaceEvenly< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >
+ distributeMassSweep(excessMassDistributionModel_, fillFieldID_, flagFieldID_, pdfFieldID_, flagInfo);
+ timeloop.add() << Sweep(distributeMassSweep, "Sweep: excess mass distribution", StateSweep::fullFreeSurface)
+ << Sweep(emptySweep, "Empty sweep: distribute excess mass")
+ << AfterFunction(CommunicationCorner_T(blockForest_, fillFieldID_),
+ "Communication: after excess mass distribution sweep")
+ << AfterFunction(
+ blockforest::UpdateSecondGhostLayer< ScalarField_T >(blockForest_, fillFieldID_),
+ "Second ghost layer update: after excess mass distribution sweep (fill level field)")
+ // update bubble model, i.e., perform registered bubble merges/splits; bubble merges/splits are
+ // already detected and registered by CellConversionSweep
+ << AfterFunction(std::bind(&bubble_model::BubbleModelBase::update, bubbleModel_),
+ "Sweep: bubble model update");
+ }
+ else
+ {
+ if (excessMassDistributionModel_.isWeightedType())
+ {
+ const ExcessMassDistributionSweepInterfaceWeighted< LatticeModel_T, FlagField_T, ScalarField_T,
+ VectorField_T >
+ distributeMassSweep(excessMassDistributionModel_, fillFieldID_, flagFieldID_, pdfFieldID_, flagInfo,
+ normalFieldID_);
+ timeloop.add() << Sweep(distributeMassSweep, "Sweep: excess mass distribution", StateSweep::fullFreeSurface)
+ << Sweep(emptySweep, "Empty sweep: distribute excess mass")
+ << AfterFunction(CommunicationCorner_T(blockForest_, fillFieldID_),
+ "Communication: after excess mass distribution sweep")
+ << AfterFunction(
+ blockforest::UpdateSecondGhostLayer< ScalarField_T >(blockForest_, fillFieldID_),
+ "Second ghost layer update: after excess mass distribution sweep (fill level field)")
+ // update bubble model, i.e., perform registered bubble merges/splits; bubble merges/splits
+ // are already detected and registered by CellConversionSweep
+ << AfterFunction(std::bind(&bubble_model::BubbleModelBase::update, bubbleModel_),
+ "Sweep: bubble model update");
+ }
+ else
+ {
+ if (excessMassDistributionModel_.isEvenlyLiquidAndAllInterfacePreferInterfaceType())
+ {
+ const ExcessMassDistributionSweepInterfaceAndLiquid< LatticeModel_T, FlagField_T, ScalarField_T,
+ VectorField_T >
+ distributeMassSweep(excessMassDistributionModel_, fillFieldID_, flagFieldID_, pdfFieldID_, flagInfo,
+ excessMassFieldID_);
+ timeloop.add()
+ << Sweep(distributeMassSweep, "Sweep: excess mass distribution", StateSweep::fullFreeSurface)
+ << Sweep(emptySweep, "Empty sweep: distribute excess mass")
+ << AfterFunction(CommunicationCorner_T(blockForest_, fillFieldID_, excessMassFieldID_),
+ "Communication: after excess mass distribution sweep")
+ << AfterFunction(blockforest::UpdateSecondGhostLayer< ScalarField_T >(blockForest_, fillFieldID_),
+ "Second ghost layer update: after excess mass distribution sweep (fill level field)")
+ // update bubble model, i.e., perform registered bubble merges/splits; bubble
+ // merges/splits are already detected and registered by CellConversionSweep
+ << AfterFunction(std::bind(&bubble_model::BubbleModelBase::update, bubbleModel_),
+ "Sweep: bubble model update");
+ }
+ }
+ }
+
+ // reset all flags that signal cell conversions (except "keepInterfaceForWettingFlag")
+ ConversionFlagsResetSweep< FlagField_T > resetConversionFlagsSweep(flagFieldID_, flagInfo);
+ timeloop.add() << Sweep(resetConversionFlagsSweep, "Sweep: conversion flag reset", StateSweep::fullFreeSurface)
+ << Sweep(emptySweep, "Empty sweep: conversion flag reset")
+ << AfterFunction(CommunicationCorner_T(blockForest_, flagFieldID_),
+ "Communication: after excess mass distribution sweep")
+ << AfterFunction(blockforest::UpdateSecondGhostLayer< FlagField_T >(blockForest_, flagFieldID_),
+ "Second ghost layer update: after excess mass distribution sweep (flag field)");
+
+ // update block states
+ timeloop.add() << Sweep(blockStateUpdate, "Sweep: block state update");
+ }
+
+ private:
+ std::shared_ptr< StructuredBlockForest > blockForest_;
+
+ BlockDataID pdfFieldID_;
+ BlockDataID flagFieldID_;
+ BlockDataID fillFieldID_;
+ BlockDataID forceFieldID_;
+
+ ConstBlockDataID normalFieldID_;
+ ConstBlockDataID curvatureFieldID_;
+
+ std::shared_ptr< BubbleModelBase > bubbleModel_;
+ std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling_;
+
+ PdfReconstructionModel pdfReconstructionModel_;
+ PdfRefillingModel pdfRefillingModel_;
+ ExcessMassDistributionModel excessMassDistributionModel_;
+ real_t relaxationRate_;
+ Vector3< real_t > globalForce_;
+ real_t surfaceTension_;
+ bool enableForceWeighting_;
+ bool useSimpleMassExchange_;
+ real_t cellConversionThreshold_;
+ real_t cellConversionForceThreshold_;
+
+ BlockDataID relaxationRateFieldID_;
+ real_t smagorinskyConstant_;
+
+ BlockDataID excessMassFieldID_ = BlockDataID();
+}; // class SurfaceDynamicsHandler
+
+} // namespace free_surface
+} // namespace walberla
\ No newline at end of file
diff --git a/src/lbm/free_surface/dynamics/functionality/AdvectMass.h b/src/lbm/free_surface/dynamics/functionality/AdvectMass.h
new file mode 100644
index 0000000000000000000000000000000000000000..5e198e2db93fe707297fa8360e95a63a9005c665
--- /dev/null
+++ b/src/lbm/free_surface/dynamics/functionality/AdvectMass.h
@@ -0,0 +1,305 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file AdvectMass.h
+//! \ingroup dynamics
+//! \author Martin Bauer
+//! \author Matthias Markl <matthias.markl@fau.de>
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Calculate the mass advection for a single interface cell.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/Abort.h"
+#include "core/logging/Logging.h"
+#include "core/timing/TimingPool.h"
+
+#include "domain_decomposition/IBlock.h"
+
+#include "lbm/field/MacroscopicValueCalculation.h"
+#include "lbm/field/PdfField.h"
+#include "lbm/free_surface/FlagInfo.h"
+#include "lbm/free_surface/bubble_model/BubbleModel.h"
+
+#include <type_traits>
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Calculate the mass advection for a single interface cell and returns the mass delta for this cell.
+ *
+ * With "useSimpleMassExchange==true", mass exchange is performed according to the paper from Koerner et al., 2005,
+ * equation (9). That is, mass is exchanged regardless of the cells' neighborhood.
+ * Mass exchange of interface cell with
+ * - obstacle cell: no mass is exchanged
+ * - gas cell: no mass is exchanged
+ * - liquid cell: mass exchange is determined by the difference between incoming and outgoing PDFs
+ * - interface cell: The mass exchange is determined by the difference between incoming and outgoing PDFs weighted with
+ * the average fill level of both interface cells. This is basically a linear estimate of the wetted
+ * area between the two cells.
+ * - free slip cell: mass is exchanged with the cell where the mirrored PDFs are coming from
+ * - inflow cell: mass exchange as with liquid cell
+ * - outflow cell: mass exchange as with interface cell (outflow cell is assumed to have the same fill level)
+ *
+ * With "useSimpleMassExchange==false", mass is exchanged according to the dissertation of N. Thuerey,
+ * 2007, sections 4.1 and 4.4, and table 4.1. However, here, the fill level field and density are used for the
+ * computations instead of storing an additional mass field.
+ * To ensure a single interface layer, an interface cell is
+ * - forced to empty if it has no fluid neighbors.
+ * - forced to fill if it has no gas neighbors.
+ * This is done by modifying the exchanged PDFs accordingly. If an interface cell is
+ * - forced to empty, only outgoing PDFs but no incoming PDFs are allowed.
+ * - forced to fill, only incoming PDFs but no outgoing PDFs are allowed.
+ * A more detailed description is available in the dissertation of N. Thuerey, 2007, section 4.4 and table 4.1.
+ *
+ * neighIt is an iterator pointing to a pre-computed flag field that contains the bitwise OR'ed neighborhood flags of
+ * the current cell. See free_surface::getOredNeighborhood for more information.
+ **********************************************************************************************************************/
+template< typename LatticeModel_T, typename FlagField_T, typename ConstScalarIt_T, typename ConstPdfIt_T,
+ typename ConstFlagIt_T, typename ConstNeighIt_T, typename FlagInfo_T >
+real_t advectMass(const FlagField_T* flagField, const ConstScalarIt_T& fillSrc, const ConstPdfIt_T& pdfFieldIt,
+ const ConstFlagIt_T& flagFieldIt, const ConstNeighIt_T& neighIt, const FlagInfo_T& flagInfo,
+ bool useSimpleMassExchange)
+{
+ using flag_c_t = typename std::remove_const< typename ConstFlagIt_T::value_type >::type;
+ using flag_n_t = typename std::remove_const< typename ConstNeighIt_T::value_type >::type;
+ using flag_i_t = typename std::remove_const< typename FlagField_T::value_type >::type;
+
+ static_assert(std::is_same< flag_i_t, flag_c_t >::value && std::is_same< flag_i_t, flag_n_t >::value,
+ "Flag types have to be equal.");
+
+ WALBERLA_ASSERT(flagInfo.isInterface(flagFieldIt), "Function advectMass() must only be called for interface cell.");
+
+ // determine the type of the current interface cell (similar to section 4.4 in the dissertation of N. Thuerey,
+ // 2007) neighIt is the pre-computed bitwise OR-ed neighborhood of the cell
+ bool localNoGasNeig = !flagInfo.isGas(*neighIt); // this cell has no gas neighbor (should be converted to liquid)
+ bool localNoFluidNeig = !flagInfo.isLiquid(*neighIt); // this cell has no fluid neighbor (should be converted to gas)
+ bool localStandardCell = !(localNoGasNeig || localNoFluidNeig); // this cell has both gas and fluid neighbors
+
+ // evaluate flag of this cell (flagFieldIt) and not the neighborhood flags (neighIt)
+ bool localWettingCell = flagInfo.isKeepInterfaceForWetting(*flagFieldIt); // this cell should be kept for wetting
+
+ if (localNoFluidNeig && localNoGasNeig &&
+ !localWettingCell) // this cell has only interface neighbors (interface layer of 3 cells width)
+ {
+ // WALBERLA_LOG_WARNING("Interface layer of 3 cells width at cell " << fillSrc.cell());
+ // set this cell to standard for enabling regular mass exchange
+ localNoGasNeig = false;
+ localNoFluidNeig = false;
+ localStandardCell = true;
+ }
+
+ real_t deltaMass = real_c(0);
+ for (auto dir = LatticeModel_T::Stencil::beginNoCenter(); dir != LatticeModel_T::Stencil::end(); ++dir)
+ {
+ flag_c_t neighFlag = flagFieldIt.neighbor(*dir);
+
+ bool isFreeSlip = false; // indicates whether dir points to a free slip cell
+
+ // from the viewpoint of the current cell, direction where the PDFs are actually coming from when there is a free
+ // slip cell in direction dir; explicitly not a Cell object to emphasize that this denotes a direction
+ Vector3< cell_idx_t > freeSlipDir;
+
+ // determine type of cell where the mirrored PDFs at free slip boundary are coming from
+ if (flagInfo.isFreeSlip(neighFlag))
+ {
+ // REMARK: the following implementation is based on lbm/boundary/FreeSlip.h
+
+ // get components of inverse direction of dir
+ const int ix = stencil::cx[stencil::inverseDir[*dir]];
+ const int iy = stencil::cy[stencil::inverseDir[*dir]];
+ const int iz = stencil::cz[stencil::inverseDir[*dir]];
+
+ int wnx = 0; // compute "normal" vector of free slip wall
+ int wny = 0;
+ int wnz = 0;
+
+ // from the current cell, go into neighboring cell in direction dir and from there determine the type of the
+ // neighboring cell in ix, iy and iz direction
+ const auto flagFieldFreeSlipPtrX = typename FlagField_T::ConstPtr(
+ *flagField, flagFieldIt.x() + dir.cx() + ix, flagFieldIt.y() + dir.cy(), flagFieldIt.z() + dir.cz());
+ if (flagInfo.isLiquid(*flagFieldFreeSlipPtrX) || flagInfo.isInterface(*flagFieldFreeSlipPtrX)) { wnx = ix; }
+
+ const auto flagFieldFreeSlipPtrY = typename FlagField_T::ConstPtr(
+ *flagField, flagFieldIt.x() + dir.cx(), flagFieldIt.y() + dir.cy() + iy, flagFieldIt.z() + dir.cz());
+ if (flagInfo.isLiquid(*flagFieldFreeSlipPtrY) || flagInfo.isInterface(*flagFieldFreeSlipPtrY)) { wny = iy; }
+
+ const auto flagFieldFreeSlipPtrZ = typename FlagField_T::ConstPtr(
+ *flagField, flagFieldIt.x() + dir.cx(), flagFieldIt.y() + dir.cy(), flagFieldIt.z() + dir.cz() + iz);
+ if (flagInfo.isLiquid(*flagFieldFreeSlipPtrZ) || flagInfo.isInterface(*flagFieldFreeSlipPtrZ)) { wnz = iz; }
+
+ // flagFieldFreeSlipPtr denotes the cell from which the PDF is coming from
+ const auto flagFieldFreeSlipPtr =
+ typename FlagField_T::ConstPtr(*flagField, flagFieldIt.x() + dir.cx() + wnx,
+ flagFieldIt.y() + dir.cy() + wny, flagFieldIt.z() + dir.cz() + wnz);
+
+ // no mass must be exchanged if:
+ // - PDFs are not coming from liquid or interface cells
+ // - PDFs are mirrored from this cell (deltaPdf=0)
+ if ((!flagInfo.isLiquid(*flagFieldFreeSlipPtr) && !flagInfo.isInterface(*flagFieldFreeSlipPtr)) ||
+ flagFieldFreeSlipPtr.cell() == flagFieldIt.cell())
+ {
+ continue;
+ }
+ else
+ {
+ // update neighFlag such that it does contain the flags of the cell that mirrored at the free slip boundary;
+ // PDFs from the boundary cell can be used because they were correctly updated by the boundary handling
+ neighFlag = *flagFieldFreeSlipPtr;
+
+ // direction of the cell that is mirrored at the free slip boundary
+ freeSlipDir = Vector3< cell_idx_t >(cell_idx_c(dir.cx() + wnx), cell_idx_c(dir.cy() + wny),
+ cell_idx_c(dir.cz() + wnz));
+ isFreeSlip = true;
+ }
+ }
+
+ // no mass exchange with gas and obstacle cells that are neither inflow nor outflow
+ if (flagInfo.isGas(neighFlag) ||
+ (flagInfo.isObstacle(neighFlag) && !flagInfo.isInflow(neighFlag) && !flagInfo.isOutflow(neighFlag)))
+ {
+ continue;
+ }
+
+ // PDF pointing from neighbor to current cell
+ const real_t neighborPdf = pdfFieldIt.neighbor(*dir, dir.toInvIdx());
+
+ // PDF pointing to neighbor
+ const real_t localPdf = pdfFieldIt.getF(dir.toIdx());
+
+ // mass exchange with liquid cells (inflow cells are considered to be liquid)
+ if (flagInfo.isLiquid(neighFlag) || flagInfo.isInflow(neighFlag))
+ {
+ // mass exchange is difference between incoming and outgoing PDFs (see equation (9) in Koerner et al., 2005)
+ deltaMass += neighborPdf - localPdf;
+ continue;
+ }
+
+ // assert cells that are neither gas, obstacle nor interface
+ WALBERLA_ASSERT(flagInfo.isInterface(neighFlag) || flagInfo.isOutflow(neighFlag),
+ "In cell " << fillSrc.cell() << ", flag of neighboring cell "
+ << Cell(fillSrc.x() + dir.cx(), fillSrc.y() + dir.cy(), fillSrc.z() + dir.cz())
+ << " is not plausible.");
+
+ // direction of the cell from which the PDFs are coming from
+ const Vector3< cell_idx_t > relevantDir =
+ isFreeSlip ? freeSlipDir :
+ Vector3< cell_idx_t >(cell_idx_c(dir.cx()), cell_idx_c(dir.cy()), cell_idx_c(dir.cz()));
+
+ // determine the type of the neighboring cell (similar to section 4.4 in the dissertation of N. Thuerey, 2007)
+ bool neighborNoGasNeig = !flagInfo.isGas(neighIt.neighbor(relevantDir[0], relevantDir[1], relevantDir[2]));
+ bool neighborNoFluidNeig = !flagInfo.isLiquid(neighIt.neighbor(relevantDir[0], relevantDir[1], relevantDir[2]));
+ bool neighborStandardCell = !(neighborNoGasNeig || neighborNoFluidNeig);
+ bool neighborWettingCell = flagInfo.isKeepInterfaceForWetting(flagFieldIt.neighbor(
+ relevantDir[0], relevantDir[1],
+ relevantDir[2])); // evaluate flag of this cell (flagFieldIt) and not the neighborhood flags (neighIt)
+
+ if (neighborNoGasNeig && neighborNoFluidNeig &&
+ !neighborWettingCell) // neighboring cell has only interface neighbors
+ {
+ // WALBERLA_LOG_WARNING("Interface layer of 3 cells width at cell " << fillSrc.cell());
+ // set neighboring cell to standard for enabling regular mass exchange
+ neighborNoGasNeig = false;
+ neighborNoFluidNeig = false;
+ neighborStandardCell = true;
+ }
+
+ const real_t localFill = *fillSrc;
+ const real_t neighborFill = fillSrc.neighbor(relevantDir[0], relevantDir[1], relevantDir[2]);
+
+ real_t fillAvg = real_c(0);
+ real_t deltaPdf = real_c(0); // deltaMass = fillAvg * deltaPdf (see equation (9) in Koerner et al., 2005)
+
+ // both cells are interface cells (standard mass exchange)
+ // see paper of C. Koerner et al., 2005, equation (9)
+ // see dissertation of N. Thuerey, 2007, table 4.1: (standard at x) <-> (standard at x_nb);
+ if (useSimpleMassExchange || (localStandardCell && (neighborStandardCell || neighborWettingCell)) ||
+ (neighborStandardCell && (localStandardCell || localWettingCell)) || flagInfo.isOutflow(neighFlag))
+ {
+ if (flagInfo.isOutflow(neighFlag))
+ {
+ fillAvg = localFill; // use local fill level only, since outflow cells do not have a meaningful fill level
+ }
+ else { fillAvg = real_c(0.5) * (neighborFill + localFill); }
+
+ deltaPdf = neighborPdf - localPdf;
+ }
+ else
+ {
+ // see dissertation of N. Thuerey, 2007, table 4.1:
+ // (standard at x) <-> (no empty neighbors at x_nb)
+ // (no fluid neighbors at x) <-> (standard cell at x_nb)
+ // (no fluid neighbors at x) <-> (no empty neighbors at x_nb)
+ // => push local, i.e., this cell empty (if it is not a cell needed for wetting)
+ if (((localStandardCell && neighborNoGasNeig) || (localNoFluidNeig && !neighborNoFluidNeig)) &&
+ !localWettingCell)
+ {
+ fillAvg = real_c(0.5) * (neighborFill + localFill);
+ deltaPdf = -localPdf;
+ }
+ else
+ {
+ // see dissertation of N. Thuerey, 2007, table 4.1:
+ // (standard at x) <-> (no fluid neighbors at x_nb)
+ // (no empty neighbors at x) <-> (standard cell at x_nb)
+ // (no empty neighbors at x) <-> (no fluid neighbors at x_nb)
+ // => push neighboring cell empty (if it is not a cell needed for wetting)
+ if (((localStandardCell && neighborNoFluidNeig) || (localNoGasNeig && !neighborNoGasNeig)) &&
+ !neighborWettingCell)
+ {
+ fillAvg = real_c(0.5) * (neighborFill + localFill);
+ deltaPdf = neighborPdf;
+ }
+ else
+ {
+ // see dissertation of N. Thuerey, 2007, table 4.1:
+ // (no fluid neighbors at x) <-> (no fluid neighbors at x_nb)
+ // (no empty neighbors at x) <-> (no empty neighbors at x_nb)
+ if ((localNoFluidNeig && neighborNoFluidNeig) || (localNoGasNeig && neighborNoGasNeig))
+ {
+ fillAvg = real_c(0.5) * (neighborFill + localFill);
+ deltaPdf = (neighborPdf - localPdf);
+ }
+ else
+ {
+ // treat remaining cases that were not covered above and include wetting cells
+ if (localWettingCell || neighborWettingCell)
+ {
+ fillAvg = real_c(0.5) * (neighborFill + localFill);
+ deltaPdf = (neighborPdf - localPdf);
+ }
+ else
+ {
+ WALBERLA_ABORT("Unknown mass advection combination of flags (loc=" << *flagFieldIt << ", neig="
+ << neighFlag << ")");
+ }
+ }
+ }
+ }
+ }
+ // this cell's deltaMass is the sum over all stencil directions (see dissertation of N. Thuerey, 2007, equation
+ // (4.4))
+ deltaMass += fillAvg * deltaPdf;
+ }
+
+ return deltaMass;
+}
+
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/dynamics/functionality/CMakeLists.txt b/src/lbm/free_surface/dynamics/functionality/CMakeLists.txt
new file mode 100644
index 0000000000000000000000000000000000000000..357412052a8cdfc0d8edab2f9a71cd2e3144dba7
--- /dev/null
+++ b/src/lbm/free_surface/dynamics/functionality/CMakeLists.txt
@@ -0,0 +1,8 @@
+target_sources( lbm
+ PRIVATE
+ AdvectMass.h
+ FindInterfaceCellConversion.h
+ GetLaplacePressure.h
+ GetOredNeighborhood.h
+ ReconstructInterfaceCellABB.h
+ )
diff --git a/src/lbm/free_surface/dynamics/functionality/FindInterfaceCellConversion.h b/src/lbm/free_surface/dynamics/functionality/FindInterfaceCellConversion.h
new file mode 100644
index 0000000000000000000000000000000000000000..6445a61f6df00edc768aa8b4bc5e96cf33c2184c
--- /dev/null
+++ b/src/lbm/free_surface/dynamics/functionality/FindInterfaceCellConversion.h
@@ -0,0 +1,255 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file FindInterfaceCellConversion.h
+//! \ingroup dynamics
+//! \author Martin Bauer
+//! \author Matthias Markl <matthias.markl@fau.de>
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Find and mark interface cells for conversion to gas/liquid.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/debug/Debug.h"
+#include "core/logging/Logging.h"
+#include "core/timing/TimingPool.h"
+
+#include "lbm/free_surface/FlagInfo.h"
+
+#include <type_traits>
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Finds interface cell conversions to gas/liquid and sets corresponding conversion flag that marks this cell for
+ * conversion.
+ *
+ * This version uses the cached OR'ed flag neighborhood given in neighborFlags. See free_surface::getOredNeighborhood.
+ *
+ * This function decides by looking at the fill level which interface cells should be converted to gas or liquid cells.
+ * It does not change the state directly, it only sets "conversion suggestions" by setting flags called
+ * 'convertToGasFlag' and 'convertToLiquidFlag'.
+ *
+ * An interface is first classified as one of the following types (same classification as in free_surface::advectMass)
+ * - _to gas_ : if cell has no liquid cell in neighborhood, this cell should become gas
+ * - _to liquid_: if cell has no gas cell in neighborhood, this cell should become liquid
+ * - _pure interface_: if not '_to gas_' and not '_to liquid_'
+ *
+ * This classification up to now depends only on the neighborhood flags, not on the fill level.
+ *
+ * _Pure interface_ cells are marked for to-gas-conversion if their fill level is lower than
+ * "0 - cellConversionThreshold" and marked for to-liquid-conversion if the fill level is higher than
+ * "1 + cellConversionThreshold". The threshold is introduced to prevent oscillating cell conversions.
+ * The value of the offset is chosen heuristically (see dissertation of N. Thuerey, 2007: 1e-3, dissertation of
+ * T. Pohl, 2008: 1e-2).
+ *
+ * Additionally, interface cells without fluid neighbors are marked for conversion to gas if an:
+ * - interface cell is almost empty (fill < cellConversionForceThreshold) AND
+ * - interface cell has no neighboring interface cells
+ * OR
+ * - interface cell has neighboring cell with outflow boundary condition
+ *
+ * Similarly, interface cells without gas neighbors are marked for conversion to liquid if:
+ * - interface cell is almost full (fill > 1.0-cellConversionForceThreshold) AND
+ * - interface cell has no neighboring interface cells
+ *
+ * The value of cellConversionForceThreshold is chosen heuristically: 1e-1 (see dissertation of N. Thuerey, 2007,
+ * section 4.4).
+ **********************************************************************************************************************/
+template< typename LatticeModel_T, typename BoundaryHandling_T, typename ScalarField_T, typename FlagField_T,
+ typename ScalarIt_T, typename FlagIt_T >
+void findInterfaceCellConversion(const BoundaryHandling_T& handling, const ScalarIt_T& fillFieldIt,
+ FlagIt_T& flagFieldIt, const typename FlagField_T::flag_t& neighborFlags,
+ const FlagInfo< FlagField_T >& flagInfo, real_t cellConversionThreshold,
+ real_t cellConversionForceThreshold)
+{
+ static_assert(std::is_same< typename FlagField_T::value_type, typename FlagIt_T::value_type >::value,
+ "The given flagFieldIt does not seem to be an iterator of the provided FlagField_T.");
+
+ static_assert(std::is_floating_point< typename ScalarIt_T::value_type >::value,
+ "The given fillFieldIt has to be a floating point value.");
+
+ cellConversionThreshold = std::abs(cellConversionThreshold);
+ cellConversionForceThreshold = std::abs(cellConversionForceThreshold);
+
+ WALBERLA_ASSERT_LESS(cellConversionThreshold, cellConversionForceThreshold);
+
+ // in the neighborhood of inflow boundaries, convert gas cells to interface cells depending on the direction of the
+ // prescribed inflow velocity
+ if (field::isFlagSet(neighborFlags, flagInfo.inflowFlagMask) && field::isFlagSet(flagFieldIt, flagInfo.gasFlag))
+ {
+ // get UBB inflow boundary
+ auto ubbInflow = handling->template getBoundaryCondition<
+ typename FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::UBB_Inflow_T >(
+ handling->getBoundaryUID(
+ FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::ubbInflowFlagID));
+
+ for (auto d = LatticeModel_T::Stencil::beginNoCenter(); d != LatticeModel_T::Stencil::end(); ++d)
+ {
+ if (field::isMaskSet(flagFieldIt.neighbor(*d), flagInfo.inflowFlagMask))
+ {
+ // get direction of cell containing inflow boundary
+ const Vector3< int > dir = Vector3< int >(-d.cx(), -d.cy(), -d.cz());
+
+ // get velocity from UBB inflow boundary
+ const Vector3< real_t > inflowVel =
+ ubbInflow.getValue(flagFieldIt.x() + d.cx(), flagFieldIt.y() + d.cy(), flagFieldIt.z() + d.cz());
+
+ // skip directions in which the corresponding velocity component is zero
+ if (realIsEqual(inflowVel[0], real_c(0), real_c(1e-14)) && dir[0] != 0) { continue; }
+ if (realIsEqual(inflowVel[1], real_c(0), real_c(1e-14)) && dir[1] != 0) { continue; }
+ if (realIsEqual(inflowVel[2], real_c(0), real_c(1e-14)) && dir[2] != 0) { continue; }
+
+ // skip directions in which the corresponding velocity component is in opposite direction
+ if (inflowVel[0] > real_c(0) && dir[0] < 0) { continue; }
+ if (inflowVel[1] > real_c(0) && dir[1] < 0) { continue; }
+ if (inflowVel[2] > real_c(0) && dir[2] < 0) { continue; }
+
+ // set conversion flag to remaining cells
+ field::addFlag(flagFieldIt, flagInfo.convertToInterfaceForInflowFlag);
+ }
+ }
+ return;
+ }
+
+ // only interface cells are converted directly (except for cells near inflow boundaries, see above)
+ if (!field::isFlagSet(flagFieldIt, flagInfo.interfaceFlag)) { return; }
+
+ // interface cell is empty and should be converted to gas
+ if (*fillFieldIt < -cellConversionThreshold)
+ {
+ if (field::isFlagSet(flagFieldIt, flagInfo.keepInterfaceForWettingFlag))
+ {
+ field::removeFlag(flagFieldIt, flagInfo.keepInterfaceForWettingFlag);
+ }
+
+ field::addFlag(flagFieldIt, flagInfo.convertToGasFlag);
+ return;
+ }
+
+ // interface cell is full and should be converted to liquid
+ if (*fillFieldIt > real_c(1.0) + cellConversionThreshold)
+ {
+ if (field::isFlagSet(flagFieldIt, flagInfo.keepInterfaceForWettingFlag))
+ {
+ field::removeFlag(flagFieldIt, flagInfo.keepInterfaceForWettingFlag);
+ }
+
+ field::addFlag(flagFieldIt, flagInfo.convertToLiquidFlag);
+ return;
+ }
+
+ // interface cell has no liquid neighbor and should be converted to gas (see dissertation of N. Thuerey, 2007
+ // section 4.4)
+ if (!field::isFlagSet(neighborFlags, flagInfo.liquidFlag) &&
+ !field::isFlagSet(flagFieldIt, flagInfo.keepInterfaceForWettingFlag) &&
+ !field::isFlagSet(neighborFlags, flagInfo.inflowFlagMask))
+ {
+ // interface cell is almost empty
+ if (*fillFieldIt < cellConversionForceThreshold && field::isFlagSet(neighborFlags, flagInfo.interfaceFlag))
+ {
+ // mass is not necessarily lost as it can be distributed to a neighboring interface cell
+ field::addFlag(flagFieldIt, flagInfo.convertToGasFlag);
+ return;
+ }
+
+ // interface cell has no other interface neighbors; conversion might lead to loss in mass (depending on the excess
+ // mass distribution model)
+ if (!field::isFlagSet(neighborFlags, flagInfo.interfaceFlag))
+ {
+ field::addFlag(flagFieldIt, flagInfo.convertToGasFlag);
+ return;
+ }
+ }
+
+ // interface cell has no gas neighbor and should be converted to liquid (see dissertation of N. Thuerey, 2007
+ // section 4.4)
+ if (!field::isFlagSet(neighborFlags, flagInfo.gasFlag) &&
+ !field::isFlagSet(flagFieldIt, flagInfo.keepInterfaceForWettingFlag))
+ {
+ // interface cell is almost full
+ if (*fillFieldIt > real_c(1.0) - cellConversionForceThreshold &&
+ field::isFlagSet(neighborFlags, flagInfo.interfaceFlag))
+ {
+ // mass is not necessarily gained as it can be taken from a neighboring interface cell
+ field::addFlag(flagFieldIt, flagInfo.convertToLiquidFlag);
+ return;
+ }
+
+ // interface cell has no other interface neighbors; conversion might lead to gain in mass (depending on the excess
+ // mass distribution model)
+ if (!field::isFlagSet(neighborFlags, flagInfo.interfaceFlag))
+ {
+ field::addFlag(flagFieldIt, flagInfo.convertToLiquidFlag);
+ return;
+ }
+ }
+}
+
+/***********************************************************************************************************************
+ * Triggers findInterfaceCellConversion() for each cell of the given fields and recomputes the OR'ed flag neighborhood
+ * info.
+ **********************************************************************************************************************/
+template< typename LatticeModel_T, typename BoundaryHandling_T, typename ScalarField_T, typename FlagField_T >
+void findInterfaceCellConversions(const BoundaryHandling_T& handling, const ScalarField_T* fillField,
+ FlagField_T* flagField, const FlagInfo< FlagField_T >& flagInfo,
+ real_t cellConversionThreshold, real_t cellConversionForceThreshold)
+{
+ WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ_OMP(flagField, uint_c(1), omp critical, {
+ const typename FlagField_T::Ptr flagFieldPtr(*flagField, x, y, z);
+ const typename ScalarField_T::ConstPtr fillFieldPtr(*fillField, x, y, z);
+
+ if (field::isFlagSet(flagFieldPtr, flagInfo.interfaceFlag))
+ {
+ const typename FlagField_T::value_type neighborFlags =
+ field::getOredNeighborhood< typename LatticeModel_T::Stencil >(flagFieldPtr);
+
+ (findInterfaceCellConversion< LatticeModel_T, BoundaryHandling_T, ScalarField_T,
+ FlagField_T >) (handling, fillFieldPtr, flagFieldPtr, neighborFlags, flagInfo,
+ cellConversionThreshold, cellConversionForceThreshold);
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ
+}
+
+/***********************************************************************************************************************
+ * Triggers findInterfaceCellConversion() for each cell of the given fields using the cached OR'ed flag neighborhood
+ * given in neighField.
+ **********************************************************************************************************************/
+template< typename LatticeModel_T, typename BoundaryHandling_T, typename ScalarField_T, typename FlagField_T,
+ typename NeighField_T >
+void findInterfaceCellConversions(const BoundaryHandling_T& handling, const ScalarField_T* fillField,
+ FlagField_T* flagField, const NeighField_T* neighField,
+ const FlagInfo< FlagField_T >& flagInfo, real_t cellConversionThreshold,
+ real_t cellConversionForceThreshold)
+{
+ WALBERLA_ASSERT_EQUAL_2(flagField->xyzSize(), fillField->xyzSize());
+ WALBERLA_ASSERT_EQUAL_2(flagField->xyzSize(), neighField->xyzSize());
+
+ WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ_OMP(flagField, uint_c(1), omp critical, {
+ const typename FlagField_T::Ptr flagFieldPtr(*flagField, x, y, z);
+ const typename ScalarField_T::ConstPtr fillFieldPtr(*fillField, x, y, z);
+
+ (findInterfaceCellConversion< LatticeModel_T, BoundaryHandling_T, ScalarField_T,
+ FlagField_T >) (handling, fillFieldPtr, flagFieldPtr, neighField->get(x, y, z),
+ flagInfo, cellConversionThreshold, cellConversionForceThreshold);
+ }) // WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ_OMP
+}
+
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/dynamics/functionality/GetLaplacePressure.h b/src/lbm/free_surface/dynamics/functionality/GetLaplacePressure.h
new file mode 100644
index 0000000000000000000000000000000000000000..36c313ee2a0027498a3d758b6378603ed160a797
--- /dev/null
+++ b/src/lbm/free_surface/dynamics/functionality/GetLaplacePressure.h
@@ -0,0 +1,61 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file GetLaplacePressure.h
+//! \ingroup dynamics
+//! \author Matthias Markl <matthias.markl@fau.de>
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Compute difference in density due to Laplace pressure.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/DataTypes.h"
+#include "core/logging/Logging.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Compute difference in density due to Laplace pressure.
+ **********************************************************************************************************************/
+inline real_t computeDeltaRhoLaplacePressure(real_t sigma, real_t curvature, real_t maxDeltaRho = real_c(0.1))
+{
+ static const real_t inv_cs2 = real_c(3); // 1.0 / (cs * cs)
+ const real_t laplacePressure = real_c(2) * sigma * curvature;
+ real_t deltaRho = inv_cs2 * laplacePressure;
+
+ if (deltaRho > maxDeltaRho)
+ {
+ WALBERLA_LOG_WARNING("Too large density variation of " << deltaRho << " due to laplacePressure "
+ << laplacePressure << " with curvature " << curvature
+ << ". Will be limited to " << maxDeltaRho << ".\n");
+ deltaRho = maxDeltaRho;
+ }
+ if (deltaRho < -maxDeltaRho)
+ {
+ WALBERLA_LOG_WARNING("Too large density variation of " << deltaRho << " due to laplacePressure "
+ << laplacePressure << " with curvature " << curvature
+ << ". Will be limited to " << -maxDeltaRho << ".\n");
+ deltaRho = -maxDeltaRho;
+ }
+
+ return deltaRho;
+}
+
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/dynamics/functionality/GetOredNeighborhood.h b/src/lbm/free_surface/dynamics/functionality/GetOredNeighborhood.h
new file mode 100644
index 0000000000000000000000000000000000000000..187528a6c08c3faf479a7e557e799fc031967f75
--- /dev/null
+++ b/src/lbm/free_surface/dynamics/functionality/GetOredNeighborhood.h
@@ -0,0 +1,62 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file GetOredNeighborhood.h
+//! \ingroup dynamics
+//! \author Martin Bauer
+//! \author Matthias Markl <matthias.markl@fau.de>
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Combines the flags of all neighboring cells using bitwise OR.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/debug/Debug.h"
+#include "core/timing/TimingPool.h"
+
+#include "field/FlagField.h"
+
+#include <type_traits>
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Combines the flags of all neighboring cells using bitwise OR.
+ * Flags are read from flagField and stored in neighborhoodFlagField. Every cell contains the bitwise OR of the
+ * neighboring flags in flagField.
+ **********************************************************************************************************************/
+template< typename Stencil_T, typename FlagField_T >
+void getOredNeighborhood(const FlagField_T* flagField, FlagField_T* neighborhoodFlagField)
+{
+ WALBERLA_ASSERT_GREATER_EQUAL(flagField->nrOfGhostLayers(), 2);
+ WALBERLA_ASSERT_EQUAL(neighborhoodFlagField->xyzSize(), flagField->xyzSize());
+ WALBERLA_ASSERT_EQUAL(neighborhoodFlagField->xyzAllocSize(), flagField->xyzAllocSize());
+
+ // REMARK: here is the reason why the flag field MUST have two ghost layers;
+ // the "OredNeighborhood" of the first ghost layer is determined, such that the first ghost layer's neighbors (i.e.,
+ // the second ghost layer) must be available
+ WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ(flagField, uint_c(1), {
+ const typename FlagField_T::ConstPtr flagFieldPtr(*flagField, x, y, z);
+ const typename FlagField_T::Ptr neighborhoodFlagFieldPtr(*neighborhoodFlagField, x, y, z);
+
+ *neighborhoodFlagFieldPtr = field::getOredNeighborhood< Stencil_T >(flagFieldPtr);
+ }) // WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOSTLAYER_XYZ
+}
+
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/dynamics/functionality/ReconstructInterfaceCellABB.h b/src/lbm/free_surface/dynamics/functionality/ReconstructInterfaceCellABB.h
new file mode 100644
index 0000000000000000000000000000000000000000..b0f45113c95155be79c6118406bcd911890b9ffa
--- /dev/null
+++ b/src/lbm/free_surface/dynamics/functionality/ReconstructInterfaceCellABB.h
@@ -0,0 +1,442 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file ReconstructInterfaceCellABB.h
+//! \ingroup dynamics
+//! \author Martin Bauer
+//! \author Matthias Markl <matthias.markl@fau.de>
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Free surface boundary condition as in Koerner et al., 2005. Similar to anti-bounce-back pressure condition.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "lbm/field/MacroscopicValueCalculation.h"
+#include "lbm/field/PdfField.h"
+#include "lbm/free_surface/dynamics/PdfReconstructionModel.h"
+#include "lbm/lattice_model/EquilibriumDistribution.h"
+
+#include "stencil/Directions.h"
+
+#include "GetLaplacePressure.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+// get index of largest entry in n_dot_ci with isInterfaceOrLiquid==true && isPdfAvailable==false
+uint_t getIndexOfMaximum(const std::vector< bool >& isInterfaceOrLiquid, const std::vector< bool >& isPdfAvailable,
+ const std::vector< real_t >& n_dot_ci);
+
+// get index of smallest entry in n_dot_ci with isInterfaceOrLiquid==true && isPdfAvailable==false
+uint_t getIndexOfMinimum(const std::vector< bool >& isInterfaceOrLiquid, const std::vector< bool >& isPdfAvailable,
+ const std::vector< real_t >& n_dot_ci);
+
+// reconstruct PDFs according to pressure anti bounce back boundary condition (page 31, equation 4.5 in dissertation of
+// N. Thuerey, 2007)
+template< typename LatticeModel_T, typename ConstPdfIt_T >
+inline real_t reconstructPressureAntiBounceBack(const stencil::Iterator< typename LatticeModel_T::Stencil >& dir,
+ const ConstPdfIt_T& pdfFieldIt, const Vector3< real_t >& u,
+ real_t rhoGas, real_t dir_independent)
+{
+ const real_t vel = real_c(dir.cx()) * u[0] + real_c(dir.cy()) * u[1] + real_c(dir.cz()) * u[2];
+
+ // compute f^{eq}_i + f^{eq}_{\overline{i}} using rhoGas (without linear terms as they cancel out)
+ const real_t tmp =
+ real_c(2.0) * LatticeModel_T::w[dir.toIdx()] * rhoGas * (dir_independent + real_c(4.5) * vel * vel);
+
+ // reconstruct PDFs (page 31, equation 4.5 in dissertation of N. Thuerey, 2007)
+ return tmp - pdfFieldIt.getF(dir.toIdx());
+}
+
+/***********************************************************************************************************************
+ * Free surface boundary condition as described in the publication of Koerner et al., 2005. Missing PDFs are
+ * reconstructed according to an anti-bounce-back pressure boundary condition at the free surface.
+ *
+ * Be aware that in Koerner et al., 2005, the PDFs are reconstructed in gas cells (neighboring to interface cells).
+ * These PDFs are then streamed into the interface cells in the LBM stream. Here, we directly reconstruct the PDFs in
+ * interface cells such that our implementation follows the notation in the dissertation of N. Thuerey, 2007, page 31.
+ * ********************************************************************************************************************/
+template< typename LatticeModel_T, typename FlagField_T, typename ConstPdfIt_T, typename ConstFlagIt_T,
+ typename ConstVectorIt_T, typename OutputArray_T >
+void reconstructInterfaceCellLegacy(const FlagField_T* flagField, const ConstPdfIt_T& pdfFieldIt,
+ const ConstFlagIt_T& flagFieldIt, const ConstVectorIt_T& normalFieldIt,
+ const FlagInfo< FlagField_T >& flagInfo, const real_t rhoGas, OutputArray_T& f,
+ const PdfReconstructionModel& pdfReconstructionModel)
+{
+ using Stencil_T = typename LatticeModel_T::Stencil;
+
+ // get velocity and density in interface cell
+ Vector3< real_t > u;
+ auto pdfField = dynamic_cast< const lbm::PdfField< LatticeModel_T >* >(pdfFieldIt.getField());
+ WALBERLA_ASSERT_NOT_NULLPTR(pdfField);
+ const real_t rho = lbm::getDensityAndMomentumDensity(u, pdfField->latticeModel(), pdfFieldIt);
+ u /= rho;
+
+ const real_t dir_independent =
+ real_c(1.0) - real_c(1.5) * u.sqrLength(); // direction independent value used for PDF reconstruction
+
+ // get type of the model that determines the PDF reconstruction
+ const PdfReconstructionModel::ReconstructionModel reconstructionModel = pdfReconstructionModel.getModelType();
+
+ // vector that stores the dot product between interface normal and lattice direction for each lattice direction
+ std::vector< real_t > n_dot_ci;
+
+ // vector that stores which index from loop "for (auto dir = Stencil_T::beginNoCenter(); dir != Stencil_T::end();
+ // ++dir)" is currently available, i.e.:
+ // - reconstructed (or scheduled for reconstruction)
+ // - coming from boundary condition
+ // - available due to fluid or interface neighbor
+ std::vector< bool > isPdfAvailable;
+
+ // vector that stores which index from loop "for (auto dir = Stencil_T::beginNoCenter(); dir != Stencil_T::end();
+ // ++dir)" points to a neighboring interface or fluid cell
+ std::vector< bool > isInterfaceOrLiquid;
+
+ // count number of reconstructed links
+ uint_t numReconstructed = uint_c(0);
+
+ for (auto dir = Stencil_T::begin(); dir != Stencil_T::end(); ++dir)
+ {
+ const auto neighborFlag = flagFieldIt.neighbor(*dir);
+
+ if (flagInfo.isObstacle(neighborFlag))
+ {
+ // free slip boundaries need special treatment because PDFs traveling from gas cells into the free slip
+ // boundary must be reconstructed, for instance:
+ // [I][G] with I: interface cell; G: gas cell; f: free slip cell
+ // [f][f]
+ // During streaming, the interface cell's PDF with direction (-1, 1) is coming from the right free slip cell.
+ // For a free slip boundary, this PDF is identical to the PDF with direction (-1, -1) in the gas cell. Since
+ // gas-side PDFs are not available, such PDFs must be reconstructed.
+ // Non-gas cells do not need to be treated here as they are treated correctly by the boundary handling.
+
+ if (flagInfo.isFreeSlip(neighborFlag))
+ {
+ // REMARK: the following implementation is based on lbm/boundary/FreeSlip.h
+
+ // get components of inverse direction of dir
+ const int ix = stencil::cx[stencil::inverseDir[*dir]];
+ const int iy = stencil::cy[stencil::inverseDir[*dir]];
+ const int iz = stencil::cz[stencil::inverseDir[*dir]];
+
+ int wnx = 0; // compute "normal" vector of free slip wall
+ int wny = 0;
+ int wnz = 0;
+
+ // from the current cell, go into neighboring cell in direction dir and from there check whether the
+ // neighbors in ix, iy and iz are gas cells
+ const auto flagFieldFreeSlipPtrX = typename FlagField_T::ConstPtr(
+ *flagField, flagFieldIt.x() + dir.cx() + ix, flagFieldIt.y() + dir.cy(), flagFieldIt.z() + dir.cz());
+ if (flagInfo.isGas(*flagFieldFreeSlipPtrX)) { wnx = ix; }
+
+ const auto flagFieldFreeSlipPtrY = typename FlagField_T::ConstPtr(
+ *flagField, flagFieldIt.x() + dir.cx(), flagFieldIt.y() + dir.cy() + iy, flagFieldIt.z() + dir.cz());
+ if (flagInfo.isGas(*flagFieldFreeSlipPtrY)) { wny = iy; }
+
+ const auto flagFieldFreeSlipPtrZ = typename FlagField_T::ConstPtr(
+ *flagField, flagFieldIt.x() + dir.cx(), flagFieldIt.y() + dir.cy(), flagFieldIt.z() + dir.cz() + iz);
+ if (flagInfo.isGas(*flagFieldFreeSlipPtrZ)) { wnz = iz; }
+
+ if (wnx != 0 || wny != 0 || wnz != 0)
+ {
+ // boundaryNeighbor denotes the cell from which the PDF is coming from
+ const auto flagFieldFreeSlipPtr =
+ typename FlagField_T::ConstPtr(*flagField, flagFieldIt.x() + dir.cx() + wnx,
+ flagFieldIt.y() + dir.cy() + wny, flagFieldIt.z() + dir.cz() + wnz);
+
+ if (flagInfo.isGas(*flagFieldFreeSlipPtr))
+ {
+ // reconstruct PDF
+ f[dir.toInvIdx()] = reconstructPressureAntiBounceBack< LatticeModel_T, ConstPdfIt_T >(
+ dir, pdfFieldIt, u, rhoGas, dir_independent);
+ isPdfAvailable.push_back(true);
+ isInterfaceOrLiquid.push_back(false);
+ n_dot_ci.push_back(
+ real_c(0)); // dummy entry for having index as in vectors isPDFAvailable and isInterfaceOrLiquid
+ ++numReconstructed;
+ continue;
+ }
+ // else: do nothing here, i.e., make usual obstacle boundary treatment below
+ } // else: concave corner, all surrounding PDFs are known, i.e., make usual obstacle boundary treatment
+ // below
+ }
+
+ f[dir.toInvIdx()] = pdfFieldIt.neighbor(*dir, dir.toInvIdx()); // use PDFs defined by boundary handling
+ isPdfAvailable.push_back(true);
+ isInterfaceOrLiquid.push_back(false);
+ n_dot_ci.push_back(
+ real_c(0)); // dummy entry for having same indices as in vectors isPDFAvailable and isInterfaceOrLiquid
+ continue;
+ }
+ else
+ {
+ if (flagInfo.isGas(neighborFlag))
+ {
+ f[dir.toInvIdx()] = reconstructPressureAntiBounceBack< LatticeModel_T, ConstPdfIt_T >(
+ dir, pdfFieldIt, u, rhoGas, dir_independent);
+ isPdfAvailable.push_back(true);
+ isInterfaceOrLiquid.push_back(false);
+ n_dot_ci.push_back(
+ real_c(0)); // dummy entry for having index as in vectors isPDFAvailable and isInterfaceOrLiquid
+ ++numReconstructed;
+ continue;
+ }
+ }
+
+ // dot product between interface normal and lattice direction
+ real_t dotProduct = (*normalFieldIt)[0] * real_c(dir.cx()) + (*normalFieldIt)[1] * real_c(dir.cy()) +
+ (*normalFieldIt)[2] * real_c(dir.cz());
+
+ // avoid numerical inaccuracies in the computation of the scalar product n_dot_ci
+ if (realIsEqual(dotProduct, real_c(0), real_c(1e-14))) { dotProduct = real_c(0); }
+
+ // approach from Koerner; reconstruct all PDFs in direction opposite to interface normal and center PDF (not
+ // stated in the paper explicitly but follows from n*e_i>=0 for i=0)
+ if (reconstructionModel == PdfReconstructionModel::ReconstructionModel::NormalBasedReconstructCenter)
+ {
+ if (dotProduct >= real_c(0))
+ {
+ f[dir.toInvIdx()] = reconstructPressureAntiBounceBack< LatticeModel_T, ConstPdfIt_T >(
+ dir, pdfFieldIt, u, rhoGas, dir_independent);
+ }
+ else
+ {
+ // regular LBM stream with PDFs from neighbor
+ f[dir.toInvIdx()] = pdfFieldIt.neighbor(*dir, dir.toInvIdx());
+ }
+ continue;
+ }
+
+ if (reconstructionModel == PdfReconstructionModel::ReconstructionModel::NormalBasedKeepCenter)
+ {
+ if (*dir == stencil::C)
+ {
+ // use old center PDF
+ f[Stencil_T::idx[stencil::C]] = pdfFieldIt[Stencil_T::idx[stencil::C]];
+ }
+ else
+ {
+ if (dotProduct >= real_c(0))
+ {
+ f[dir.toInvIdx()] = reconstructPressureAntiBounceBack< LatticeModel_T, ConstPdfIt_T >(
+ dir, pdfFieldIt, u, rhoGas, dir_independent);
+ }
+ else
+ {
+ // regular LBM stream with PDFs from neighbor
+ f[dir.toInvIdx()] = pdfFieldIt.neighbor(*dir, dir.toInvIdx());
+ }
+ }
+ continue;
+ }
+
+ // reconstruct all non-obstacle PDFs, including those that come from liquid and are already known
+ if (reconstructionModel == PdfReconstructionModel::ReconstructionModel::All)
+ {
+ f[dir.toInvIdx()] = reconstructPressureAntiBounceBack< LatticeModel_T, ConstPdfIt_T >(dir, pdfFieldIt, u,
+ rhoGas, dir_independent);
+ continue;
+ }
+
+ // reconstruct only those gas-side PDFs that are really missing
+ if (reconstructionModel == PdfReconstructionModel::ReconstructionModel::OnlyMissing)
+ {
+ // regular LBM stream with PDFs from neighboring interface or liquid cell
+ f[dir.toInvIdx()] = pdfFieldIt.neighbor(*dir, dir.toInvIdx());
+ continue;
+ }
+
+ // reconstruct only those gas-side PDFs that are really missing but make sure that at least a
+ // specified number of PDFs are reconstructed (even if available PDFs are overwritten)
+ if (reconstructionModel == PdfReconstructionModel::ReconstructionModel::OnlyMissingMin)
+ {
+ isPdfAvailable.push_back(false); // PDF has not yet been marked for reconstruction
+ isInterfaceOrLiquid.push_back(true);
+ n_dot_ci.push_back(dotProduct);
+ continue;
+ }
+
+ WALBERLA_ABORT("Unknown pdfReconstructionModel.")
+ }
+
+ if (reconstructionModel == PdfReconstructionModel::ReconstructionModel::OnlyMissingMin)
+ {
+ WALBERLA_ASSERT_EQUAL(Stencil_T::Size, uint_c(n_dot_ci.size()));
+ WALBERLA_ASSERT_EQUAL(Stencil_T::Size, uint_c(isInterfaceOrLiquid.size()));
+ WALBERLA_ASSERT_EQUAL(Stencil_T::Size, uint_c(isPdfAvailable.size()));
+
+ const uint_t numMinReconstruct = pdfReconstructionModel.getNumMinReconstruct();
+
+ // number of remaining PDFs that need to be reconstructed according to the specified model (number can be negative
+ // => do not use uint_t)
+ int numRemainingReconstruct = int_c(numMinReconstruct) - int_c(numReconstructed);
+
+ // count the number of neighboring cells that are interface or liquid (and not obstacle or gas)
+ const uint_t numLiquidNeighbors =
+ uint_c(std::count_if(isInterfaceOrLiquid.begin(), isInterfaceOrLiquid.end(), [](bool a) { return a; }));
+
+ // // REMARK: this was commented because it regularly occurred in practical simulations (e.g. BreakingDam)
+ // if (numRemainingReconstruct > int_c(0) && numRemainingReconstruct < int_c(numLiquidNeighbors))
+ // {
+ // // There are less neighboring liquid and interface cells than needed to reconstruct PDFs in the
+ // // free surface boundary condition. You have probably specified a large minimum number of PDFs to be
+ // // reconstructed. This happens e.g. near solid boundaries (especially corners). There, the number of
+ // // surrounding non-obstacle cells might be less than the number of PDFs that you want to have
+ // // reconstructed.
+ // WALBERLA_LOG_WARNING_ON_ROOT("Less PDFs reconstructed in cell "
+ // << pdfFieldIt.cell()
+ // << " than specified in the PDF reconstruction model. See comment in "
+ // "source code of ReconstructInterfaceCellABB.h for further information. "
+ // "Here, as many PDFs as possible are reconstructed now.");
+ // }
+
+ // count additionally reconstructed PDFs (that come from interface or liquid)
+ uint_t numAdditionalReconstructed = uint_c(0);
+
+ // define which PDFs to additionally reconstruct (overwrite known information) according to the specified model
+ while (numRemainingReconstruct > int_c(0) && numAdditionalReconstructed < numLiquidNeighbors)
+ {
+ if (pdfReconstructionModel.getFallbackModel() == PdfReconstructionModel::FallbackModel::Largest)
+ {
+ // get index of largest n_dot_ci with isInterfaceOrLiquid==true && isPdfAvailable==false
+ const uint_t maxIndex = getIndexOfMaximum(isInterfaceOrLiquid, isPdfAvailable, n_dot_ci);
+ isPdfAvailable[maxIndex] = true; // reconstruct this PDF later
+ ++numReconstructed;
+ ++numAdditionalReconstructed;
+ }
+ else
+ {
+ if (pdfReconstructionModel.getFallbackModel() == PdfReconstructionModel::FallbackModel::Smallest)
+ {
+ // get index of smallest n_dot_ci with isInterfaceOrLiquid==true && isPdfAvailable==false
+ const uint_t minIndex = getIndexOfMinimum(isInterfaceOrLiquid, isPdfAvailable, n_dot_ci);
+ isPdfAvailable[minIndex] = true; // reconstruct this PDF later
+ ++numReconstructed;
+ ++numAdditionalReconstructed;
+ }
+ else
+ {
+ // use approach from Koerner
+ if (pdfReconstructionModel.getFallbackModel() ==
+ PdfReconstructionModel::FallbackModel::NormalBasedKeepCenter)
+ {
+ uint_t index = uint_c(0);
+ for (const real_t& value : n_dot_ci)
+ {
+ if (value >= real_c(0) && index > uint_c(1)) // skip center PDF with index=0
+ {
+ isPdfAvailable[index] = true; // reconstruct this PDF later
+ }
+
+ ++index;
+ }
+ break; // exit while loop
+ }
+ else { WALBERLA_ABORT("Unknown fallbackModel in pdfReconstructionModel.") }
+ }
+ }
+
+ numRemainingReconstruct = int_c(numMinReconstruct) - int_c(numReconstructed);
+ }
+
+ // reconstruct additional PDFs
+ uint_t index = uint_c(0);
+ for (auto dir = Stencil_T::begin(); dir != Stencil_T::end(); ++dir, ++index)
+ {
+ const auto neighborFlag = flagFieldIt.neighbor(*dir);
+
+ // skip links pointing to obstacle and gas neighbors; they were treated above already
+ if (flagInfo.isObstacle(neighborFlag) || flagInfo.isGas(neighborFlag)) { continue; }
+ else
+ {
+ // reconstruct links that were marked for reconstruction
+ if (isPdfAvailable[index] && isInterfaceOrLiquid[index])
+ {
+ f[dir.toInvIdx()] = reconstructPressureAntiBounceBack< LatticeModel_T, ConstPdfIt_T >(
+ dir, pdfFieldIt, u, rhoGas, dir_independent);
+ }
+ else
+ {
+ if (!isPdfAvailable[index] && isInterfaceOrLiquid[index])
+ {
+ // regular LBM stream with PDFs from neighbor
+ f[dir.toInvIdx()] = pdfFieldIt.neighbor(*dir, dir.toInvIdx());
+ continue;
+ }
+ WALBERLA_ABORT("Error in PDF reconstruction. This point should never be reached.")
+ }
+ }
+ }
+ }
+}
+
+uint_t getIndexOfMaximum(const std::vector< bool >& isInterfaceOrLiquid, const std::vector< bool >& isPdfAvailable,
+ const std::vector< real_t >& n_dot_ci)
+{
+ real_t maximum = -std::numeric_limits< real_t >::max();
+ uint_t index = std::numeric_limits< uint_t >::max();
+
+ for (uint_t i = uint_c(0); i != isInterfaceOrLiquid.size(); ++i)
+ {
+ if (isInterfaceOrLiquid[i] && !isPdfAvailable[i])
+ {
+ const real_t absValue = std::abs(n_dot_ci[i]);
+ if (absValue > maximum)
+ {
+ maximum = absValue;
+ index = i;
+ }
+ }
+ }
+
+ // less Pdfs available for being reconstructed than specified by the user; these assertions should never fail, as the
+ // conditionals in reconstructInterfaceCellLegacy() should avoid calling this function
+ WALBERLA_ASSERT(maximum > -real_c(std::numeric_limits< real_t >::min()));
+ WALBERLA_ASSERT(index != std::numeric_limits< uint_t >::max());
+
+ return index;
+}
+
+uint_t getIndexOfMinimum(const std::vector< bool >& isInterfaceOrLiquid, const std::vector< bool >& isPdfAvailable,
+ const std::vector< real_t >& n_dot_ci)
+{
+ real_t minimum = std::numeric_limits< real_t >::max();
+ uint_t index = std::numeric_limits< uint_t >::max();
+
+ for (uint_t i = uint_c(0); i != isInterfaceOrLiquid.size(); ++i)
+ {
+ if (isInterfaceOrLiquid[i] && !isPdfAvailable[i])
+ {
+ const real_t absValue = std::abs(n_dot_ci[i]);
+ if (absValue < minimum)
+ {
+ minimum = absValue;
+ index = i;
+ }
+ }
+ }
+
+ // fewer PDFs available for being reconstructed than specified by the user; these assertions should never fail, as
+ // the conditionals in reconstructInterfaceCellLegacy() should avoid calling this function
+ WALBERLA_ASSERT(minimum < real_c(std::numeric_limits< real_t >::max()));
+ WALBERLA_ASSERT(index != std::numeric_limits< uint_t >::max());
+
+ return index;
+}
+
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/surface_geometry/CMakeLists.txt b/src/lbm/free_surface/surface_geometry/CMakeLists.txt
new file mode 100644
index 0000000000000000000000000000000000000000..42fb177b77f77d2fa745866c7f5ef2cb677ea00c
--- /dev/null
+++ b/src/lbm/free_surface/surface_geometry/CMakeLists.txt
@@ -0,0 +1,22 @@
+target_sources( lbm
+ PRIVATE
+ ContactAngle.h
+ CurvatureModel.h
+ CurvatureModel.impl.h
+ CurvatureSweep.h
+ CurvatureSweep.impl.h
+ DetectWettingSweep.h
+ ExtrapolateNormalsSweep.h
+ ExtrapolateNormalsSweep.impl.h
+ NormalSweep.h
+ NormalSweep.impl.h
+ ObstacleFillLevelSweep.h
+ ObstacleFillLevelSweep.impl.h
+ ObstacleNormalSweep.h
+ ObstacleNormalSweep.impl.h
+ SmoothingSweep.h
+ SmoothingSweep.impl.h
+ SurfaceGeometryHandler.h
+ Utility.cpp
+ Utility.h
+ )
diff --git a/src/lbm/free_surface/surface_geometry/ContactAngle.h b/src/lbm/free_surface/surface_geometry/ContactAngle.h
new file mode 100644
index 0000000000000000000000000000000000000000..55f26d5ce82404d1e420440ce482d78178bcfd84
--- /dev/null
+++ b/src/lbm/free_surface/surface_geometry/ContactAngle.h
@@ -0,0 +1,54 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file ContactAngle.h
+//! \ingroup surface_geometry
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Class to avoid re-computing sine and cosine of the contact angle.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/math/Constants.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Class to avoid re-computing sine and cosine of the contact angle.
+ **********************************************************************************************************************/
+class ContactAngle
+{
+ public:
+ ContactAngle(real_t angleInDegrees)
+ : angleDegrees_(angleInDegrees), angleRadians_(math::pi / real_c(180) * angleInDegrees),
+ sinAngle_(std::sin(angleRadians_)), cosAngle_(std::cos(angleRadians_))
+ {}
+
+ inline real_t getInDegrees() const { return angleDegrees_; }
+ inline real_t getInRadians() const { return angleRadians_; }
+ inline real_t getSin() const { return sinAngle_; }
+ inline real_t getCos() const { return cosAngle_; }
+
+ private:
+ real_t angleDegrees_;
+ real_t angleRadians_;
+ real_t sinAngle_;
+ real_t cosAngle_;
+}; // class ContactAngle
+} // namespace free_surface
+} // namespace walberla
\ No newline at end of file
diff --git a/src/lbm/free_surface/surface_geometry/CurvatureModel.h b/src/lbm/free_surface/surface_geometry/CurvatureModel.h
new file mode 100644
index 0000000000000000000000000000000000000000..dd245dacfaeeb8ac5aaab3a07495c3e107d5d335
--- /dev/null
+++ b/src/lbm/free_surface/surface_geometry/CurvatureModel.h
@@ -0,0 +1,90 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file CurvatureModel.h
+//! \ingroup surface_geometry
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Collection of sweeps required for using a specific curvature model.
+//
+//======================================================================================================================
+
+#pragma once
+
+namespace walberla
+{
+namespace free_surface
+{
+// forward declaration
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+class SurfaceGeometryHandler;
+
+namespace curvature_model
+{
+/***********************************************************************************************************************
+ * Collection of sweeps for computing the curvature using a finite difference-based (Parker-Youngs) approach according
+ * to:
+ * dissertation of S. Bogner, 2017 (section 4.4.2.1)
+ **********************************************************************************************************************/
+template< typename Stencil_T, typename LatticeModel_T, typename FlagField_T, typename ScalarField_T,
+ typename VectorField_T >
+class FiniteDifferenceMethod
+{
+ private:
+ using SurfaceGeometryHandler_T =
+ walberla::free_surface::SurfaceGeometryHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >;
+
+ public:
+ void addSweeps(SweepTimeloop& timeloop, const SurfaceGeometryHandler_T& geometryHandler);
+}; // class FiniteDifferenceMethod
+
+/***********************************************************************************************************************
+ * Collection of sweeps for computing the curvature using local triangulation according to:
+ * - dissertation of T. Pohl, 2008 (section 2.5)
+ * - dissertation of S. Donath, 2011 (wetting model, section 6.3.3)
+ **********************************************************************************************************************/
+template< typename Stencil_T, typename LatticeModel_T, typename FlagField_T, typename ScalarField_T,
+ typename VectorField_T >
+class LocalTriangulation
+{
+ private:
+ using SurfaceGeometryHandler_T =
+ walberla::free_surface::SurfaceGeometryHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >;
+
+ public:
+ void addSweeps(SweepTimeloop& timeloop, const SurfaceGeometryHandler_T& geometryHandler);
+}; // class LocalTriangulation
+
+/***********************************************************************************************************************
+ * Collection of sweeps for computing the curvature with a simplistic finite difference method. This approach is not
+ * documented in literature and neither thoroughly tested or validated.
+ * Use it with caution and preferably for testing purposes only.
+ **********************************************************************************************************************/
+template< typename Stencil_T, typename LatticeModel_T, typename FlagField_T, typename ScalarField_T,
+ typename VectorField_T >
+class SimpleFiniteDifferenceMethod
+{
+ private:
+ using SurfaceGeometryHandler_T =
+ walberla::free_surface::SurfaceGeometryHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >;
+
+ public:
+ void addSweeps(SweepTimeloop& timeloop, const SurfaceGeometryHandler_T& geometryHandler);
+}; // class SimpleFiniteDifferenceMethod
+
+} // namespace curvature_model
+} // namespace free_surface
+} // namespace walberla
+
+#include "CurvatureModel.impl.h"
\ No newline at end of file
diff --git a/src/lbm/free_surface/surface_geometry/CurvatureModel.impl.h b/src/lbm/free_surface/surface_geometry/CurvatureModel.impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..0aa62fc3c53e3f538607c7f8cfa64b28fde44699
--- /dev/null
+++ b/src/lbm/free_surface/surface_geometry/CurvatureModel.impl.h
@@ -0,0 +1,269 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file CurvatureModel.impl.h
+//! \ingroup surface_geometry
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Collection of sweeps required for using a specific curvature model.
+//
+//======================================================================================================================
+
+#include "lbm/blockforest/communication/UpdateSecondGhostLayer.h"
+
+#include "CurvatureModel.h"
+#include "CurvatureSweep.h"
+#include "DetectWettingSweep.h"
+#include "ExtrapolateNormalsSweep.h"
+#include "NormalSweep.h"
+#include "ObstacleFillLevelSweep.h"
+#include "ObstacleNormalSweep.h"
+#include "SmoothingSweep.h"
+#include "SurfaceGeometryHandler.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace curvature_model
+{
+// empty sweep required for using selectors (e.g. StateSweep::fullFreeSurface)
+struct emptySweep
+{
+ void operator()(IBlock*) {}
+};
+
+template< typename Stencil_T, typename LatticeModel_T, typename FlagField_T, typename ScalarField_T,
+ typename VectorField_T >
+void FiniteDifferenceMethod< Stencil_T, LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >::addSweeps(
+ SweepTimeloop& timeloop, const FiniteDifferenceMethod::SurfaceGeometryHandler_T& geometryHandler)
+{
+ using Communication_T = typename SurfaceGeometryHandler_T::Communication_T;
+ using StateSweep = typename SurfaceGeometryHandler_T::StateSweep;
+
+ // layout for allocating the smoothed fill level field
+ field::Layout fillFieldLayout = field::fzyx;
+
+ // check if an obstacle cell is in a non-periodic outermost global ghost layer; used to check if two ghost layers are
+ // required for the fill level field
+ const Vector3< bool > isObstacleInGlobalGhostLayerXYZ =
+ geometryHandler.freeSurfaceBoundaryHandling_->isObstacleInGlobalGhostLayer();
+
+ bool isObstacleInGlobalGhostLayer = false;
+ if ((!geometryHandler.blockForest_->isXPeriodic() && isObstacleInGlobalGhostLayerXYZ[0]) ||
+ (!geometryHandler.blockForest_->isYPeriodic() && isObstacleInGlobalGhostLayerXYZ[1]) ||
+ (!geometryHandler.blockForest_->isZPeriodic() && isObstacleInGlobalGhostLayerXYZ[2]))
+ {
+ isObstacleInGlobalGhostLayer = true;
+ }
+
+ for (auto blockIt = geometryHandler.blockForest_->begin(); blockIt != geometryHandler.blockForest_->end(); ++blockIt)
+ {
+ const ScalarField_T* const fillField =
+ blockIt->template getData< const ScalarField_T >(geometryHandler.fillFieldID_);
+
+ // check if two ghost layers are required for the fill level field
+ if (isObstacleInGlobalGhostLayer && fillField->nrOfGhostLayers() < uint_c(2) && geometryHandler.enableWetting_)
+ {
+ WALBERLA_ABORT(
+ "With wetting enabled, the curvature computation with the finite difference method requires two ghost "
+ "layers in the fill level field whenever solid obstacles are located in a global outermost ghost layer. "
+ "For more information, see the remark in the description of ObstacleFillLevelSweep.h");
+ }
+
+ // get layout of fill level field (to be used in allocating the smoothed fill level field; cloning would
+ // waste memory, as the fill level field might have two ghost layers, whereas the smoothed fill level field needs
+ // only one ghost layer)
+ fillFieldLayout = fillField->layout();
+ }
+
+ // IMPORTANT REMARK: ObstacleNormalSweep and ObstacleFillLevelSweep must be executed on all blocks, because the
+ // SmoothingSweep requires meaningful values in the ghost layers.
+
+ // add field for smoothed fill levels
+ BlockDataID smoothFillFieldID = field::addToStorage< ScalarField_T >(
+ geometryHandler.blockForest_, "Smooth fill level field", real_c(0), fillFieldLayout, uint_c(1));
+
+ if (geometryHandler.enableWetting_)
+ {
+ // compute obstacle normals
+ ObstacleNormalSweep< Stencil_T, FlagField_T, VectorField_T > obstacleNormalSweep(
+ geometryHandler.obstacleNormalFieldID_, geometryHandler.flagFieldID_, flagIDs::interfaceFlagID,
+ flagIDs::liquidInterfaceGasFlagIDs, geometryHandler.obstacleFlagIDSet_, false, true, true);
+ timeloop.add() << Sweep(obstacleNormalSweep, "Sweep: obstacle normal computation")
+ << AfterFunction(
+ Communication_T(geometryHandler.blockForest_, geometryHandler.obstacleNormalFieldID_),
+ "Communication: after obstacle normal sweep");
+
+ // reflect fill level into obstacle cells such that they can be used for smoothing the fill level field and for
+ // computing the interface normal; MUST be performed BEFORE SmoothingSweep
+ ObstacleFillLevelSweep< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > obstacleFillLevelSweep(
+ smoothFillFieldID, geometryHandler.fillFieldID_, geometryHandler.flagFieldID_,
+ geometryHandler.obstacleNormalFieldID_, flagIDs::liquidInterfaceGasFlagIDs,
+ geometryHandler.obstacleFlagIDSet_);
+ timeloop.add() << Sweep(obstacleFillLevelSweep, "Sweep: obstacle fill level computation")
+ << AfterFunction(Communication_T(geometryHandler.blockForest_, smoothFillFieldID),
+ "Communication: after obstacle fill level sweep");
+ }
+
+ // smooth fill level field for decreasing error in finite difference normal and curvature computation (see
+ // dissertation of S. Bogner, 2017 (section 4.4.2.1))
+ SmoothingSweep< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > smoothingSweep(
+ smoothFillFieldID, geometryHandler.fillFieldID_, geometryHandler.flagFieldID_, flagIDs::liquidInterfaceGasFlagIDs,
+ geometryHandler.obstacleFlagIDSet_, geometryHandler.enableWetting_);
+ // IMPORTANT REMARK: SmoothingSweep must be executed on all blocks, because the algorithm works on all liquid,
+ // interface and gas cells. This is necessary since the normals are not only computed in interface cells, but also in
+ // the neighborhood of interface cells. Therefore, meaningful values for the fill levels of the second neighbors of
+ // interface cells are also required in NormalSweep.
+ timeloop.add() << Sweep(smoothingSweep, "Sweep: fill level smoothing")
+ << AfterFunction(Communication_T(geometryHandler.blockForest_, smoothFillFieldID),
+ "Communication: after smoothing sweep");
+
+ // compute interface normals (using smoothed fill level field)
+ NormalSweep< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > normalSweep(
+ geometryHandler.normalFieldID_, smoothFillFieldID, geometryHandler.flagFieldID_, flagIDs::interfaceFlagID,
+ flagIDs::liquidInterfaceGasFlagIDs, geometryHandler.obstacleFlagIDSet_, true, geometryHandler.enableWetting_,
+ true, geometryHandler.enableWetting_);
+ timeloop.add() << Sweep(normalSweep, "Sweep: normal computation", StateSweep::fullFreeSurface)
+ << Sweep(emptySweep(), "Empty sweep: normal")
+ << AfterFunction(Communication_T(geometryHandler.blockForest_, geometryHandler.normalFieldID_),
+ "Communication: after normal sweep");
+
+ if (geometryHandler.computeCurvature_)
+ {
+ // compute interface curvature using finite differences according to Brackbill et al.
+ CurvatureSweepFiniteDifferences< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > curvSweep(
+ geometryHandler.curvatureFieldID_, geometryHandler.normalFieldID_, geometryHandler.obstacleNormalFieldID_,
+ geometryHandler.flagFieldID_, flagIDs::interfaceFlagID, flagIDs::liquidInterfaceGasFlagIDs,
+ geometryHandler.obstacleFlagIDSet_, geometryHandler.enableWetting_, geometryHandler.contactAngle_);
+ timeloop.add() << Sweep(curvSweep, "Sweep: curvature computation (finite difference method)",
+ StateSweep::fullFreeSurface)
+ << Sweep(emptySweep(), "Empty sweep: curvature")
+ << AfterFunction(Communication_T(geometryHandler.blockForest_, geometryHandler.curvatureFieldID_),
+ "Communication: after curvature sweep");
+ }
+}
+
+template< typename Stencil_T, typename LatticeModel_T, typename FlagField_T, typename ScalarField_T,
+ typename VectorField_T >
+void LocalTriangulation< Stencil_T, LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >::addSweeps(
+ SweepTimeloop& timeloop, const LocalTriangulation::SurfaceGeometryHandler_T& geometryHandler)
+{
+ using Communication_T = typename SurfaceGeometryHandler_T::Communication_T;
+ using StateSweep = typename SurfaceGeometryHandler_T::StateSweep;
+
+ // compute interface normals
+ NormalSweep< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > normalSweep(
+ geometryHandler.normalFieldID_, geometryHandler.fillFieldID_, geometryHandler.flagFieldID_,
+ flagIDs::interfaceFlagID, flagIDs::liquidInterfaceGasFlagIDs, geometryHandler.obstacleFlagIDSet_, false, false,
+ true, false);
+ timeloop.add() << Sweep(normalSweep, "Sweep: normal computation", StateSweep::fullFreeSurface)
+ << Sweep(emptySweep(), "Empty sweep: normal")
+ << AfterFunction(Communication_T(geometryHandler.blockForest_, geometryHandler.normalFieldID_),
+ "Communication: after normal sweep");
+
+ // compute obstacle normals
+ ObstacleNormalSweep< Stencil_T, FlagField_T, VectorField_T > obstacleNormalSweep(
+ geometryHandler.obstacleNormalFieldID_, geometryHandler.flagFieldID_, flagIDs::interfaceFlagID,
+ flagIDs::liquidInterfaceGasFlagIDs, geometryHandler.obstacleFlagIDSet_, true, false, false);
+ timeloop.add() << Sweep(obstacleNormalSweep, "Sweep: obstacle normal computation", StateSweep::fullFreeSurface)
+ << Sweep(emptySweep(), "Empty sweep: obstacle normal")
+ << AfterFunction(
+ Communication_T(geometryHandler.blockForest_, geometryHandler.obstacleNormalFieldID_),
+ "Communication: after obstacle normal sweep");
+
+ if (geometryHandler.computeCurvature_)
+ {
+ // compute interface curvature using local triangulation according to dissertation of T. Pohl, 2008
+ CurvatureSweepLocalTriangulation< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > curvSweep(
+ geometryHandler.blockForest_, geometryHandler.curvatureFieldID_, geometryHandler.normalFieldID_,
+ geometryHandler.fillFieldID_, geometryHandler.flagFieldID_, geometryHandler.obstacleNormalFieldID_,
+ flagIDs::interfaceFlagID, geometryHandler.obstacleFlagIDSet_, geometryHandler.enableWetting_,
+ geometryHandler.contactAngle_);
+ timeloop.add() << Sweep(curvSweep, "Sweep: curvature computation (local triangulation)",
+ StateSweep::fullFreeSurface)
+ << Sweep(emptySweep(), "Empty sweep: curvature")
+ << AfterFunction(Communication_T(geometryHandler.blockForest_, geometryHandler.curvatureFieldID_),
+ "Communication: after curvature sweep");
+ }
+
+ // sweep for detecting cells that need to be converted to interface cells for continuing the wetting
+ // surface correctly
+ // IMPORTANT REMARK: this MUST NOT be performed when using finite differences for curvature computation and can
+ // otherwise lead to instabilities and errors
+ if (geometryHandler.enableWetting_)
+ {
+ const auto& flagInfo = geometryHandler.freeSurfaceBoundaryHandling_->getFlagInfo();
+
+ DetectWettingSweep<
+ Stencil_T,
+ typename FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::BoundaryHandling_T,
+ FlagField_T, ScalarField_T, VectorField_T >
+ detWetSweep(geometryHandler.freeSurfaceBoundaryHandling_->getHandlingID(), flagInfo,
+ geometryHandler.normalFieldID_, geometryHandler.fillFieldID_);
+ timeloop.add() << Sweep(detWetSweep, "Sweep: wetting detection", StateSweep::fullFreeSurface)
+ << Sweep(emptySweep(), "Empty sweep: wetting detection")
+ << AfterFunction(Communication_T(geometryHandler.blockForest_, geometryHandler.flagFieldID_),
+ "Communication: after wetting detection sweep")
+ << AfterFunction(blockforest::UpdateSecondGhostLayer< FlagField_T >(geometryHandler.blockForest_,
+ geometryHandler.flagFieldID_),
+ "Second ghost layer update: after wetting detection sweep (flag field)");
+ }
+}
+
+template< typename Stencil_T, typename LatticeModel_T, typename FlagField_T, typename ScalarField_T,
+ typename VectorField_T >
+void SimpleFiniteDifferenceMethod< Stencil_T, LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >::addSweeps(
+ SweepTimeloop& timeloop, const SimpleFiniteDifferenceMethod::SurfaceGeometryHandler_T& geometryHandler)
+{
+ using Communication_T = typename SurfaceGeometryHandler_T::Communication_T;
+ using StateSweep = typename SurfaceGeometryHandler_T::StateSweep;
+
+ // compute interface normals
+ NormalSweep< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > normalSweep(
+ geometryHandler.normalFieldID_, geometryHandler.fillFieldID_, geometryHandler.flagFieldID_,
+ flagIDs::interfaceFlagID, flagIDs::liquidInterfaceGasFlagIDs, geometryHandler.obstacleFlagIDSet_, false, false,
+ false, false);
+ timeloop.add() << Sweep(normalSweep, "Sweep: normal computation", StateSweep::fullFreeSurface)
+ << Sweep(emptySweep(), "Empty sweep: normal")
+ << AfterFunction(Communication_T(geometryHandler.blockForest_, geometryHandler.normalFieldID_),
+ "Communication: after normal sweep");
+
+ // extrapolation of normals to interface neighboring cells (required for computing the curvature with finite
+ // differences)
+ ExtrapolateNormalsSweep< Stencil_T, FlagField_T, VectorField_T > extNormalsSweep(
+ geometryHandler.normalFieldID_, geometryHandler.flagFieldID_, flagIDs::interfaceFlagID);
+ timeloop.add() << Sweep(extNormalsSweep, "Sweep: normal extrapolation", StateSweep::fullFreeSurface)
+ << Sweep(emptySweep(), "Empty sweep: normal extrapolation")
+ << AfterFunction(Communication_T(geometryHandler.blockForest_, geometryHandler.normalFieldID_),
+ "Communication: after normal extrapolation sweep");
+
+ if (geometryHandler.computeCurvature_)
+ {
+ // curvature computation using finite differences
+ CurvatureSweepSimpleFiniteDifferences< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > curvSweep(
+ geometryHandler.curvatureFieldID_, geometryHandler.normalFieldID_, geometryHandler.flagFieldID_,
+ flagIDs::interfaceFlagID, geometryHandler.obstacleFlagIDSet_, geometryHandler.enableWetting_,
+ geometryHandler.contactAngle_);
+ timeloop.add() << Sweep(curvSweep, "Sweep: curvature computation (simple finite difference method)",
+ StateSweep::fullFreeSurface)
+ << Sweep(emptySweep(), "Empty sweep: curvature")
+ << AfterFunction(Communication_T(geometryHandler.blockForest_, geometryHandler.curvatureFieldID_),
+ "Communication: after curvature sweep ");
+ }
+}
+
+} // namespace curvature_model
+} // namespace free_surface
+} // namespace walberla
\ No newline at end of file
diff --git a/src/lbm/free_surface/surface_geometry/CurvatureSweep.h b/src/lbm/free_surface/surface_geometry/CurvatureSweep.h
new file mode 100644
index 0000000000000000000000000000000000000000..dfe53545c609478d5543e6a86ba328137c49b369
--- /dev/null
+++ b/src/lbm/free_surface/surface_geometry/CurvatureSweep.h
@@ -0,0 +1,211 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file CurvatureSweep.h
+//! \ingroup surface_geometry
+//! \author Martin Bauer
+//! \author Matthias Markl <matthias.markl@fau.de>
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Sweeps for computing the interface curvature.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "blockforest/StructuredBlockForest.h"
+
+#include "core/logging/Logging.h"
+#include "core/math/Constants.h"
+
+#include "domain_decomposition/BlockDataID.h"
+
+#include "field/FlagField.h"
+
+#include "stencil/D2Q9.h"
+#include "stencil/D3Q27.h"
+#include "stencil/Directions.h"
+
+#include <type_traits>
+#include <vector>
+
+#include "ContactAngle.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Compute the interface curvature using a finite difference scheme (Parker-Youngs approach) as described in
+ * - dissertation of S. Bogner, 2017 (section 4.4.2.1)
+ * which is based on
+ * - Brackbill, Kothe and Zemach, "A continuum method ...", 1992
+ **********************************************************************************************************************/
+template< typename Stencil_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+class CurvatureSweepFiniteDifferences
+{
+ protected:
+ using vector_t = typename std::remove_const< typename VectorField_T::value_type >::type;
+ using flag_t = typename std::remove_const< typename FlagField_T::value_type >::type;
+
+ public:
+ CurvatureSweepFiniteDifferences(const BlockDataID& curvatureFieldID, const ConstBlockDataID& normalFieldID,
+ const ConstBlockDataID& obstacleNormalFieldID, const ConstBlockDataID& flagFieldID,
+ const FlagUID& interfaceFlagID, const Set< FlagUID >& liquidInterfaceGasFlagIDSet,
+ const Set< FlagUID >& obstacleFlagIDSet, bool enableWetting,
+ const ContactAngle& contactAngle)
+ : curvatureFieldID_(curvatureFieldID), normalFieldID_(normalFieldID),
+ obstacleNormalFieldID_(obstacleNormalFieldID), flagFieldID_(flagFieldID), enableWetting_(enableWetting),
+ contactAngle_(contactAngle), interfaceFlagID_(interfaceFlagID),
+ liquidInterfaceGasFlagIDSet_(liquidInterfaceGasFlagIDSet), obstacleFlagIDSet_(obstacleFlagIDSet)
+ {}
+
+ void operator()(IBlock* const block);
+
+ /********************************************************************************************************************
+ * Returns an adjusted interface normal according to the wetting model from the dissertation of S. Bogner, 2017
+ * (section 4.4.2.1).
+ *******************************************************************************************************************/
+ template< typename VectorIt_T >
+ Vector3< real_t > getNormalWithWetting(VectorIt_T normalFieldIt, VectorIt_T obstacleNormalFieldIt,
+ const stencil::Direction dir)
+ {
+ // get reversed interface normal
+ const Vector3< real_t > n = -*normalFieldIt;
+
+ // get n_w, i.e., obstacle normal
+ const Vector3< real_t > nw = obstacleNormalFieldIt.neighbor(dir);
+
+ // get n_t: vector tangent to the wall and normal to the contact line; obtained by subtracting the wall-normal
+ // component from the interface normal n
+ Vector3< real_t > nt = n - (nw * n) * nw; // "(nw * n) * nw" is orthogonal projection of nw on n
+ nt = nt.getNormalizedOrZero();
+
+ // compute interface normal at wall according to wetting model (equation 4.21 in dissertation of S. Bogner,
+ // 2017)
+ const Vector3< real_t > nWall = nw * contactAngle_.getCos() + nt * contactAngle_.getSin();
+
+ // extrapolate into obstacle cell to obtain boundary value; expression comes from 1D extrapolation formula
+ // IMPORTANT REMARK: corner and diagonal directions must use different formula, Bogner did not consider this in
+ // his implementation; here, nevertheless Bogner's approach is used
+ const Vector3< real_t > nWallExtrapolated = n + real_c(2) * (nWall - n);
+
+ return -nWallExtrapolated;
+ }
+
+ private:
+ BlockDataID curvatureFieldID_;
+ ConstBlockDataID normalFieldID_;
+ ConstBlockDataID obstacleNormalFieldID_;
+ ConstBlockDataID flagFieldID_;
+
+ bool enableWetting_;
+ ContactAngle contactAngle_;
+
+ FlagUID interfaceFlagID_;
+ Set< FlagUID > liquidInterfaceGasFlagIDSet_;
+ Set< FlagUID > obstacleFlagIDSet_;
+}; // class CurvatureSweepFiniteDifferences
+
+/***********************************************************************************************************************
+ * Compute the interface curvature using local triangulation as described in
+ * - dissertation of T. Pohl, 2008 (section 2.5)
+ * - dissertation of S. Donath, 2011 (wetting model, section 6.3.3)
+ **********************************************************************************************************************/
+template< typename Stencil_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+class CurvatureSweepLocalTriangulation
+{
+ protected:
+ using vector_t = typename std::remove_const< typename VectorField_T::value_type >::type;
+
+ public:
+ CurvatureSweepLocalTriangulation(const std::weak_ptr< const StructuredBlockForest >& blockForest,
+ const BlockDataID& curvatureFieldID, const ConstBlockDataID& normalFieldID,
+ const ConstBlockDataID& fillFieldID, const ConstBlockDataID& flagFieldID,
+ const ConstBlockDataID& obstacleNormalFieldID, const FlagUID& interfaceFlagID,
+ const Set< FlagUID >& obstacleFlagIDSet, bool enableWetting,
+ const ContactAngle& contactAngle)
+ : blockForest_(blockForest), curvatureFieldID_(curvatureFieldID), normalFieldID_(normalFieldID),
+ fillFieldID_(fillFieldID), flagFieldID_(flagFieldID), obstacleNormalFieldID_(obstacleNormalFieldID),
+ enableWetting_(enableWetting), contactAngle_(contactAngle), interfaceFlagID_(interfaceFlagID),
+ obstacleFlagIDSet_(obstacleFlagIDSet)
+ {
+ if constexpr (std::is_same_v< Stencil_T, stencil::D2Q9 >)
+ {
+ WALBERLA_ABORT(
+ "Curvature computation with local triangulation using a D2Q9 stencil has not been thoroughly tested.");
+ }
+ }
+
+ void operator()(IBlock* const block);
+
+ private:
+ std::weak_ptr< const StructuredBlockForest > blockForest_;
+ BlockDataID curvatureFieldID_;
+ ConstBlockDataID normalFieldID_;
+ ConstBlockDataID fillFieldID_;
+ ConstBlockDataID flagFieldID_;
+ ConstBlockDataID obstacleNormalFieldID_;
+
+ bool enableWetting_;
+ ContactAngle contactAngle_;
+
+ FlagUID interfaceFlagID_;
+ Set< FlagUID > obstacleFlagIDSet_;
+}; // class CurvatureSweepLocalTriangulation
+
+/***********************************************************************************************************************
+ * Compute the interface curvature with a simplistic finite difference method. This approach is not documented in
+ * literature and neither thoroughly tested or validated.
+ * Use it with caution and preferably for testing purposes only.
+ **********************************************************************************************************************/
+template< typename Stencil_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+class CurvatureSweepSimpleFiniteDifferences
+{
+ protected:
+ using vector_t = typename std::remove_const< typename VectorField_T::value_type >::type;
+
+ public:
+ CurvatureSweepSimpleFiniteDifferences(const BlockDataID& curvatureFieldID, const ConstBlockDataID& normalFieldID,
+ const ConstBlockDataID& flagFieldID, const FlagUID& interfaceFlagID,
+ const Set< FlagUID >& obstacleFlagIDSet, bool enableWetting,
+ const ContactAngle& contactAngle)
+ : curvatureFieldID_(curvatureFieldID), normalFieldID_(normalFieldID), flagFieldID_(flagFieldID),
+ enableWetting_(enableWetting), contactAngle_(contactAngle), interfaceFlagID_(interfaceFlagID),
+ obstacleFlagIDSet_(obstacleFlagIDSet)
+ {
+ WALBERLA_LOG_WARNING_ON_ROOT(
+ "You are using curvature computation based on a simplistic finite difference method. This "
+ "was implemented for testing purposes only and has not been thoroughly "
+ "validated and tested in the current state of the code. Use it with caution.");
+ }
+
+ void operator()(IBlock* const block);
+
+ private:
+ BlockDataID curvatureFieldID_;
+ ConstBlockDataID normalFieldID_;
+ ConstBlockDataID flagFieldID_;
+
+ bool enableWetting_;
+ ContactAngle contactAngle_;
+
+ FlagUID interfaceFlagID_;
+ Set< FlagUID > obstacleFlagIDSet_;
+}; // class CurvatureSweepSimpleFiniteDifferences
+
+} // namespace free_surface
+} // namespace walberla
+
+#include "CurvatureSweep.impl.h"
\ No newline at end of file
diff --git a/src/lbm/free_surface/surface_geometry/CurvatureSweep.impl.h b/src/lbm/free_surface/surface_geometry/CurvatureSweep.impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..f6d46d10334e86a23e20593a06de5af1b37e5b2b
--- /dev/null
+++ b/src/lbm/free_surface/surface_geometry/CurvatureSweep.impl.h
@@ -0,0 +1,518 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file CurvatureSweep.impl.h
+//! \ingroup surface_geometry
+//! \author Martin Bauer
+//! \author Matthias Markl <matthias.markl@fau.de>
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Sweeps for computing the interface curvature.
+//
+//======================================================================================================================
+
+#include "core/debug/CheckFunctions.h"
+#include "core/logging/Logging.h"
+#include "core/math/Matrix3.h"
+#include "core/math/Utility.h"
+#include "core/math/Vector3.h"
+
+#include "field/FlagField.h"
+
+#include "stencil/D3Q27.h"
+#include "stencil/Directions.h"
+
+#include <algorithm>
+#include <cmath>
+
+#include "ContactAngle.h"
+#include "CurvatureSweep.h"
+#include "Utility.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+template< typename Stencil_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+void CurvatureSweepFiniteDifferences< Stencil_T, FlagField_T, ScalarField_T, VectorField_T >::operator()(
+ IBlock* const block)
+{
+ // get fields
+ ScalarField_T* const curvatureField = block->getData< ScalarField_T >(curvatureFieldID_);
+ const VectorField_T* const normalField = block->getData< const VectorField_T >(normalFieldID_);
+ const VectorField_T* const obstacleNormalField = block->getData< const VectorField_T >(obstacleNormalFieldID_);
+ const FlagField_T* const flagField = block->getData< const FlagField_T >(flagFieldID_);
+
+ // get flags
+ const flag_t interfaceFlag = flagField->getFlag(interfaceFlagID_);
+ const flag_t liquidInterfaceGasFlagMask = flagField->getMask(liquidInterfaceGasFlagIDSet_);
+ const flag_t obstacleFlagMask = flagField->getMask(obstacleFlagIDSet_);
+
+ WALBERLA_FOR_ALL_CELLS(
+ flagFieldIt, flagField, normalFieldIt, normalField, obstacleNormalFieldIt, obstacleNormalField, curvatureFieldIt,
+ curvatureField, {
+ real_t& curv = *curvatureFieldIt;
+ curv = real_c(0.0);
+
+ if (isFlagSet(flagFieldIt, interfaceFlag)) // only treat interface cells
+ {
+ real_t weightSum = real_c(0);
+
+ if (normalFieldIt->sqrLength() < real_c(1e-14))
+ {
+ WALBERLA_LOG_WARNING("Invalid normal detected in CurvatureSweep.")
+ continue;
+ }
+
+ // Parker-Youngs central finite difference approximation of curvature (see dissertation
+ // of S. Bogner, 2017, section 4.4.2.1)
+ for (auto dir = Stencil_T::beginNoCenter(); dir != Stencil_T::end(); ++dir)
+ {
+ const Vector3< real_t > dirVector =
+ Vector3< real_t >(real_c(dir.cx()), real_c(dir.cy()), real_c(dir.cz()));
+
+ Vector3< real_t > neighborNormal;
+
+ if (isPartOfMaskSet(flagFieldIt.neighbor(*dir), liquidInterfaceGasFlagMask | obstacleFlagMask))
+ {
+ // get interface normal of neighbor in direction dir with respect to wetting model
+ if (enableWetting_ && isPartOfMaskSet(flagFieldIt.neighbor(*dir), obstacleFlagMask))
+ {
+ neighborNormal = getNormalWithWetting(normalFieldIt, obstacleNormalFieldIt, *dir);
+ neighborNormal = neighborNormal.getNormalizedOrZero();
+ }
+ else
+ {
+ if (isPartOfMaskSet(flagFieldIt.neighbor(*dir), liquidInterfaceGasFlagMask))
+ {
+ neighborNormal = normalFieldIt.neighbor(*dir);
+ }
+ else
+ {
+ // skip remainder of this direction such that it is not considered in curvature computation
+ continue;
+ }
+ }
+ }
+
+ // equation (35) in Brackbill et al. discretized with finite difference method
+ // according to Parker-Youngs
+ if constexpr (Stencil_T::D == uint_t(2))
+ {
+ const real_t weight =
+ real_c(stencil::gaussianMultipliers[stencil::D3Q27::idx[stencil::map2Dto3D[2][*dir]]]);
+ weightSum += weight;
+ curv += weight * (dirVector * neighborNormal);
+ }
+ else
+ {
+ const real_t weight = real_c(stencil::gaussianMultipliers[dir.toIdx()]);
+ weightSum += weight;
+ curv += weight * (dirVector * neighborNormal);
+ }
+ }
+
+ // divide by sum of weights in Parker-Youngs approximation; sum does not contain weights of directions in
+ // which there is no liquid, interface, gas, or obstacle cell (only when wetting is enabled, otherwise
+ // obstacle cell is also not considered); must be done like this because otherwise such non-valid
+ // directions would implicitly influence the finite difference scheme by assuming a normal of zero
+ curv /= weightSum;
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+}
+
+template< typename Stencil_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+void CurvatureSweepLocalTriangulation< Stencil_T, FlagField_T, ScalarField_T, VectorField_T >::operator()(
+ IBlock* const block)
+{
+ const auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ // struct for storing relevant information of each neighboring interface cell (POD type)
+ using Neighbor = struct
+ {
+ Vector3< real_t > diff; // difference (distance in coordinates) between this and neighboring interface point
+ Vector3< real_t > diffNorm; // normalized difference between this and neighboring interface point
+ Vector3< real_t > normal; // interface normal of neighboring interface point
+ real_t dist2; // square of the distance between this and neighboring interface point
+ real_t area; // sum of the area of the two triangles that this neighboring interface is part of
+ real_t sort; // angle that is used to sort the order neighboring points accordingly
+ bool valid; // validity, used to remove triangles with too narrow angles
+ bool wall; // used to include wetting effects near solid cells
+ };
+
+ // get fields
+ ScalarField_T* const curvatureField = block->getData< ScalarField_T >(curvatureFieldID_);
+ const VectorField_T* const normalField = block->getData< const VectorField_T >(normalFieldID_);
+ const ScalarField_T* const fillField = block->getData< const ScalarField_T >(fillFieldID_);
+ const FlagField_T* const flagField = block->getData< const FlagField_T >(flagFieldID_);
+ const VectorField_T* const obstacleNormalField = block->getData< const VectorField_T >(obstacleNormalFieldID_);
+
+ // get flags
+ auto interfaceFlag = flagField->getFlag(interfaceFlagID_);
+ auto obstacleFlagMask = flagField->getMask(obstacleFlagIDSet_);
+
+ WALBERLA_FOR_ALL_CELLS(
+ flagFieldIt, flagField, normalFieldIt, normalField, fillFieldIt, fillField, obstacleNormalFieldIt,
+ obstacleNormalField, curvatureFieldIt, curvatureField, {
+ real_t& curv = *curvatureFieldIt;
+ curv = real_c(0.0);
+ std::vector< Neighbor > neighbors;
+ Vector3< real_t > meanInterfaceNormal;
+
+ // compute curvature only in interface points
+ if (!isFlagSet(flagFieldIt, interfaceFlag)) { continue; }
+
+ // normal of this cell also contributes to mean normal
+ meanInterfaceNormal = *normalFieldIt;
+
+ // iterate over all neighboring cells (Eq. 2.18 in dissertation of T. Pohl, 2008)
+ for (auto dir = Stencil_T::beginNoCenter(); dir != Stencil_T::end(); ++dir)
+ {
+ auto neighborFlags = flagFieldIt.neighbor(*dir);
+
+ if (isFlagSet(neighborFlags, interfaceFlag) || // Eq. 2.19 in dissertation of T. Pohl, 2008
+ (isPartOfMaskSet(neighborFlags, obstacleFlagMask) &&
+ dir.toIdx() <= uint_c(18))) // obstacle in main direction or diagonal direction (not corner direction)
+ {
+ Vector3< real_t > neighborNormal;
+ const real_t neighborFillLevel = fillFieldIt.neighbor(*dir);
+
+ // if loop was entered because of neighboring solid cell, normal of this solid cell points towards the
+ // currently processed interface cell
+ Vector3< real_t > wallNormal(real_c(-dir.cx()), real_c(-dir.cy()), real_c(-dir.cz()));
+
+ if (isPartOfMaskSet(neighborFlags, obstacleFlagMask))
+ {
+ neighborNormal =
+ Vector3< real_t >(real_c(1)); // temporarily guarantees "neighborNormal.sqrLength()>0"
+ wallNormal.getNormalized();
+ }
+ else { neighborNormal = normalFieldIt.neighbor(*dir); }
+
+ if (neighborNormal.sqrLength() > real_c(0))
+ {
+ Neighbor n;
+
+ // get global coordinate (with respect to whole simulation domain) of the currently processed cell
+ Vector3< real_t > globalCellCoordinate =
+ blockForest->getBlockLocalCellCenter(*block, flagFieldIt.cell()) - Vector3< real_t >(real_c(0.5));
+
+ for (auto dir2 = Stencil_T::beginNoCenter(); dir2 != Stencil_T::end(); ++dir2)
+ {
+ // stay in the close neighborhood of the currently processed interface cell
+ if ((dir.cx() != 0 && dir2.cx() != 0) || (dir.cy() != 0 && dir2.cy() != 0) ||
+ (dir.cz() != 0 && dir2.cz() != 0))
+ {
+ continue;
+ }
+
+ if (isPartOfMaskSet(neighborFlags, obstacleFlagMask) && enableWetting_)
+ {
+ // get flags of neighboring cell in direction dir2
+ auto neighborFlagsInDir2 = flagFieldIt.neighbor(*dir2);
+
+ // the currently processed interface cell i has a neighboring solid cell j in direction dir;
+ // get the flags of j's neighboring cell in direction dir2
+ // i.e., from the current cell, go to neighbor in dir; from there, go to next cell in dir2
+ auto neighborNeighborFlags =
+ flagFieldIt.neighbor(dir.cx() + dir2.cx(), dir.cy() + dir2.cy(), dir.cz() + dir2.cz());
+
+ // true if the currently processed interface cell i has a neighboring interface cell j (in
+ // dir2), which (j) has a neighboring obstacle cell in the same direction as i does (in dir)
+ if (isFlagSet(neighborFlagsInDir2, interfaceFlag) &&
+ isPartOfMaskSet(neighborNeighborFlags, obstacleFlagMask))
+ {
+ // get the normal of the currently processed interface cell's neighboring interface cell
+ // (in direction 2)
+ Vector3< real_t > neighborNormalDir2 = normalFieldIt.neighbor(*dir2);
+
+ Vector3< real_t > neighborGlobalCoordDir2 = globalCellCoordinate;
+ neighborGlobalCoordDir2[0] += real_c(dir2.cx());
+ neighborGlobalCoordDir2[1] += real_c(dir2.cy());
+ neighborGlobalCoordDir2[2] += real_c(dir2.cz());
+
+ // get neighboring interface point, i.e., location of interface within cell
+ Vector3< real_t > neighborGlobalInterfacePoint =
+ getInterfacePoint(normalFieldIt.neighbor(*dir2), fillFieldIt.neighbor(*dir2));
+
+ // transform to global coordinates, i.e., neighborInterfacePoint specifies the global
+ // location of the interface point in the currently processed interface cell's neighbor in
+ // direction dir2
+ neighborGlobalInterfacePoint += neighborGlobalCoordDir2;
+
+ // get the mean (averaged over multiple solid cells) wall normal of the neighbor in
+ // direction dir2
+ Vector3< real_t > obstacleNormal = obstacleNormalFieldIt.neighbor(*dir2);
+ obstacleNormal *= real_c(-1);
+ if (obstacleNormal.sqrLength() < real_c(1e-10)) { obstacleNormal = wallNormal; }
+
+ Vector3< real_t > neighborPoint;
+
+ bool result = computeArtificalWallPoint(
+ neighborGlobalInterfacePoint, neighborGlobalCoordDir2, neighborNormalDir2, wallNormal,
+ obstacleNormal, contactAngle_, neighborPoint, neighborNormal);
+ if (!result) { continue; }
+ n.wall = true;
+ n.diff = neighborPoint - neighborGlobalInterfacePoint;
+ n.dist2 = n.diff.sqrLength();
+ }
+ else { continue; }
+ }
+ else
+ // will be entered if:
+ // isFlagSet(neighborFlags, interfaceFlag) && !isPartOfMaskSet(neighborFlags, obstacleFlagMask)
+ {
+ n.wall = false;
+
+ // get neighboring interface point, i.e., location of interface within cell
+ n.diff = getInterfacePoint(neighborNormal, neighborFillLevel);
+
+ // get distance between this cell (0,0,0) and neighboring interface point + (dx,dy,dz)
+ n.diff += Vector3< real_t >(real_c(dir.cx()), real_c(dir.cy()), real_c(dir.cz()));
+
+ // get distance between this and neighboring interface point
+ n.diff -= getInterfacePoint(*normalFieldIt, *fillFieldIt);
+ n.dist2 = n.diff.sqrLength();
+ }
+
+ // exclude neighboring interface points that are too close or too far away from this cell's
+ // interface point
+ if (n.dist2 >= real_c(0.64) && n.dist2 <= real_c(3.24)) // Eq. 2.20, 0.64 = 0.8^2; 3.24 = 1.8^2
+ {
+ n.normal = neighborNormal;
+ n.diffNorm = n.diff.getNormalized();
+ n.area = real_c(0);
+ n.sort = real_c(0);
+ n.valid = true;
+
+ neighbors.push_back(n);
+ }
+
+ // if there is no obstacle, loop should be interrupted immediately
+ if (!isPartOfMaskSet(neighborFlags, obstacleFlagMask))
+ {
+ // interrupt loop
+ break;
+ }
+ }
+ }
+ }
+ }
+
+ // remove degenerated triangles, see dissertation of T. Pohl, 2008, p. 27
+ for (auto nIt1 = ++neighbors.begin(); !neighbors.empty() && nIt1 != neighbors.end(); ++nIt1)
+ {
+ if (!nIt1->valid) { continue; }
+
+ for (auto nIt2 = neighbors.begin(); nIt2 != nIt1; ++nIt2)
+ {
+ if (!nIt2->valid) { continue; }
+
+ // triangle is degenerated if angle between surface normals is less than 30° (heuristically chosen
+ // in dissertation of T. Pohl, 2008, p. 27); greater sign is correct here due to cos(29) > cos(30)
+ if (nIt1->diffNorm * nIt2->diffNorm >
+ real_c(0.866)) // cos(30°) = 0.866, as in dissertation of T. Pohl, 2008, p. 27
+ {
+ const real_t diff = nIt1->dist2 - nIt2->dist2;
+
+ if (diff < real_c(1e-4)) { nIt1->valid = nIt1->wall ? true : false; }
+ if (diff > real_c(-1e-4)) { nIt2->valid = nIt2->wall ? true : false; }
+ }
+ }
+ }
+
+ // remove invalid neighbors
+ neighbors.erase(std::remove_if(neighbors.begin(), neighbors.end(), [](const Neighbor& a) { return !a.valid; }),
+ neighbors.end());
+
+ if (neighbors.size() < 4)
+ {
+ // WALBERLA_LOG_WARNING_ON_ROOT(
+ // "Not enough faces in curvature reconstruction, setting curvature in this cell to zero.");
+ curv = real_c(0); // not documented in literature but taken from S. Donath's code
+ continue; // process next cell in WALBERLA_FOR_ALL_CELLS
+ }
+
+ // compute mean normal
+ for (auto const& n : neighbors)
+ {
+ meanInterfaceNormal += n.normal;
+ }
+ meanInterfaceNormal = meanInterfaceNormal.getNormalized();
+
+ // compute xAxis and yAxis that define a coordinate system on a tangent plane for sorting neighbors
+ // T_i' = (I - N * N^t) * (p_i - p); projection of neighbors.diff[0] onto tangent plane (Figure 2.14 in
+ // dissertation of T. Pohl, 2008)
+ Vector3< real_t > xAxis =
+ (Matrix3< real_t >::makeIdentityMatrix() - dyadicProduct(meanInterfaceNormal, meanInterfaceNormal)) *
+ neighbors[0].diff;
+
+ // T_i = T_i' / ||T_i'||
+ xAxis = xAxis.getNormalized();
+
+ // get vector that is orthogonal to xAxis and meanInterfaceNormal
+ const Vector3< real_t > yAxis = cross(xAxis, meanInterfaceNormal);
+
+ for (auto& n : neighbors)
+ {
+ // get cosine of angles between n.diff and axes of the new coordinate system
+ const real_t cosAngX = xAxis * n.diff;
+ const real_t cosAngY = yAxis * n.diff;
+
+ // sort the neighboring interface points using atan2 (which is not just atan(wy/wx), see Wikipedia)
+ n.sort = std::atan2(cosAngY, cosAngX);
+ }
+
+ std::sort(neighbors.begin(), neighbors.end(),
+ [](const Neighbor& a, const Neighbor& b) { return a.sort < b.sort; });
+
+ Vector3< real_t > meanTriangleNormal(real_c(0));
+ for (auto nIt1 = neighbors.begin(); neighbors.size() > uint_c(1) && nIt1 != neighbors.end(); ++nIt1)
+ {
+ // index of second neighbor starts over at 0: (k + 1) mod N_P
+ auto nIt2 = (nIt1 != (neighbors.end() - 1)) ? (nIt1 + 1) : neighbors.begin();
+
+ // N_f_k (with real length, i.e., not normalized yet)
+ const Vector3< real_t > triangleNormal = cross(nIt1->diff, nIt2->diff);
+
+ // |f_k| (multiplication with 0.5, since triangleNormal.length() is area of parallelogram and not
+ // triangle)
+ const real_t area = real_c(0.5) * triangleNormal.length();
+
+ // lambda_i' = |f_{(i-1+N_p) mod N_p}| + |f_i|
+ nIt1->area += area; // from the view of na, this is |f_i|
+ nIt2->area += area; // from the view of nb, this is |f_{(i-1+N_p) mod N_p}|, i.e., area of the face
+ // from the neighbor with smaller index
+
+ // N' = sum(|f_k| * N_f_k)
+ meanTriangleNormal += area * triangleNormal;
+ }
+
+ if (meanTriangleNormal.length() < real_c(1e-10))
+ {
+ // WALBERLA_LOG_WARNING_ON_ROOT("Invalid meanTriangleNormal, setting curvature in this cell to zero.");
+ curv = real_c(0); // not documented in literature but taken from S. Donath's code
+ continue; // process next cell in WALBERLA_FOR_ALL_CELLS
+ }
+
+ // N = N' / ||N'||
+ meanTriangleNormal = meanTriangleNormal.getNormalized();
+
+ // I - N * N^t; matrix for projection of vector on tangent plane
+ const Matrix3< real_t > projMatrix =
+ Matrix3< real_t >::makeIdentityMatrix() - dyadicProduct(meanTriangleNormal, meanTriangleNormal);
+
+ // M
+ Matrix3< real_t > mMatrix(real_c(0));
+
+ // sum(lambda_i')
+ real_t neighborAreaSum = real_c(0);
+
+ // M = sum(lambda_i' * kappa_i * T_i * T_i^t)
+ for (auto& n : neighbors)
+ {
+ if (n.area > real_c(0))
+ {
+ // kappa_i = 2 * N^t * (p_i - p) / ||p_i - p||^2
+ const real_t kappa = real_c(2) * (meanTriangleNormal * n.diff) / n.dist2;
+
+ // T_i' = (I - N * N^t) * (p_i - p)
+ Vector3< real_t > tVector = projMatrix * n.diff;
+
+ // T_i = T_i' / ||T_i'||
+ tVector = tVector.getNormalized();
+
+ // T_i * T_i^t
+ const Matrix3< real_t > auxMat = dyadicProduct(tVector, tVector);
+
+ // M += T_i * T_i^t * kappa_i * lambda_i'
+ mMatrix += auxMat * kappa * n.area;
+
+ // sum(lambda_i')
+ neighborAreaSum += n.area;
+ }
+ }
+
+ // M = M * 1 / sum(lambda_i')
+ mMatrix = mMatrix * (real_c(1) / neighborAreaSum);
+
+ // kappa = tr(M)
+ curv = (mMatrix(0, 0) + mMatrix(1, 1) + mMatrix(2, 2));
+ }) // WALBERLA_FOR_ALL_CELLS
+}
+
+template< typename Stencil_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+void CurvatureSweepSimpleFiniteDifferences< Stencil_T, FlagField_T, ScalarField_T, VectorField_T >::operator()(
+ IBlock* const block)
+{
+ // get fields
+ ScalarField_T* const curvatureField = block->getData< ScalarField_T >(curvatureFieldID_);
+ const VectorField_T* const normalField = block->getData< const VectorField_T >(normalFieldID_);
+ const FlagField_T* const flagField = block->getData< const FlagField_T >(flagFieldID_);
+
+ // get flags
+ auto interfaceFlag = flagField->getFlag(interfaceFlagID_);
+ auto obstacleFlagMask = flagField->getMask(obstacleFlagIDSet_);
+
+ WALBERLA_FOR_ALL_CELLS(flagFieldIt, flagField, normalFieldIt, normalField, curvatureFieldIt, curvatureField, {
+ real_t& curv = *curvatureFieldIt;
+ curv = real_c(0.0);
+
+ // interface cells
+ if (isFlagSet(flagFieldIt, interfaceFlag))
+ {
+ // this cell is next to a wall/obstacle
+ if (enableWetting_ && isFlagInNeighborhood< Stencil_T >(flagFieldIt, obstacleFlagMask))
+ {
+ // compute wall/obstacle curvature
+ vector_t obstacleNormal(real_c(0), real_c(0), real_c(0));
+ for (auto it = Stencil_T::beginNoCenter(); it != Stencil_T::end(); ++it)
+ {
+ // calculate obstacle normal with central finite difference approximation of the surface's gradient (see
+ // dissertation of S. Donath, 2011, section 6.3.5.2)
+ if (isPartOfMaskSet(flagFieldIt.neighbor(*it), obstacleFlagMask))
+ {
+ obstacleNormal[0] -= real_c(it.cx());
+ obstacleNormal[1] -= real_c(it.cy());
+ obstacleNormal[2] -= real_c(it.cz());
+ }
+ }
+
+ if (obstacleNormal.sqrLength() > real_c(0))
+ {
+ obstacleNormal = obstacleNormal.getNormalized();
+
+ // IMPORTANT REMARK:
+ // the following wetting model is not documented in literature and not tested for correctness; use it
+ // with caution
+ curv = -real_c(0.25) * (contactAngle_.getCos() - (*normalFieldIt) * obstacleNormal);
+ }
+ }
+ else // no obstacle cell is in next neighborhood
+ {
+ // central finite difference approximation of curvature (see dissertation of S. Bogner, 2017,
+ // section 4.4.2.1)
+ curv = normalFieldIt.neighbor(1, 0, 0)[0] - normalFieldIt.neighbor(-1, 0, 0)[0] +
+ normalFieldIt.neighbor(0, 1, 0)[1] - normalFieldIt.neighbor(0, -1, 0)[1] +
+ normalFieldIt.neighbor(0, 0, 1)[2] - normalFieldIt.neighbor(0, 0, -1)[2];
+
+ curv *= real_c(0.25);
+ }
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+}
+
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/surface_geometry/DetectWettingSweep.h b/src/lbm/free_surface/surface_geometry/DetectWettingSweep.h
new file mode 100644
index 0000000000000000000000000000000000000000..f4d69e0afc47fd98952f69344fd646f64e976e9a
--- /dev/null
+++ b/src/lbm/free_surface/surface_geometry/DetectWettingSweep.h
@@ -0,0 +1,334 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file DetectWettingSweep.h
+//! \ingroup surface_geometry
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Sweep for detecting cells that need to be converted to interface to obtain a smooth wetting interface.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "blockforest/StructuredBlockForest.h"
+
+#include "core/math/Constants.h"
+
+#include "domain_decomposition/BlockDataID.h"
+
+#include "field/FlagField.h"
+
+#include "stencil/D2Q4.h"
+#include "stencil/D3Q19.h"
+
+#include <type_traits>
+#include <vector>
+
+#include "ContactAngle.h"
+#include "Utility.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Sweep for detecting interface cells that need to be created in order to obtain a smooth interface continuation in
+ * case of wetting.
+ *
+ * See dissertation of S. Donath, 2011 section 6.3.5.3.
+ **********************************************************************************************************************/
+template< typename Stencil_T, typename BoundaryHandling_T, typename FlagField_T, typename ScalarField_T,
+ typename VectorField_T >
+class DetectWettingSweep
+{
+ protected:
+ using FlagUIDSet = Set< FlagUID >;
+
+ using vector_t = typename std::remove_const< typename VectorField_T::value_type >::type;
+
+ // restrict stencil because surface continuation in corner directions is not meaningful
+ using WettingStencil_T = typename std::conditional< Stencil_T::D == uint_t(2), stencil::D2Q9, stencil::D3Q19 >::type;
+
+ public:
+ DetectWettingSweep(BlockDataID boundaryHandling, const FlagInfo< FlagField_T >& flagInfo,
+ const ConstBlockDataID& normalFieldID, const ConstBlockDataID& fillFieldID)
+ : boundaryHandlingID_(boundaryHandling), flagInfo_(flagInfo), normalFieldID_(normalFieldID),
+ fillFieldID_(fillFieldID)
+ {}
+
+ void operator()(IBlock* const block);
+
+ private:
+ BlockDataID boundaryHandlingID_;
+ FlagInfo< FlagField_T > flagInfo_;
+ ConstBlockDataID normalFieldID_;
+ ConstBlockDataID fillFieldID_;
+ ConstBlockDataID flagFieldID_;
+
+}; // class DetectWettingSweep
+
+template< typename Stencil_T, typename BoundaryHandling_T, typename FlagField_T, typename ScalarField_T,
+ typename VectorField_T >
+void DetectWettingSweep< Stencil_T, BoundaryHandling_T, FlagField_T, ScalarField_T, VectorField_T >::operator()(
+ IBlock* const block)
+{
+ // get free surface boundary handling
+ BoundaryHandling_T* const boundaryHandling = block->getData< BoundaryHandling_T >(boundaryHandlingID_);
+
+ // get fields
+ const VectorField_T* const normalField = block->getData< const VectorField_T >(normalFieldID_);
+ const ScalarField_T* const fillField = block->getData< const ScalarField_T >(fillFieldID_);
+ const FlagField_T* const flagField = boundaryHandling->getFlagField();
+
+ // get flags
+ const FlagInfo< FlagField_T >& flagInfo = flagInfo_;
+ using flag_t = typename FlagField_T::flag_t;
+
+ const flag_t liquidInterfaceGasFlagMask = flagInfo_.liquidFlag | flagInfo_.interfaceFlag | flagInfo_.gasFlag;
+
+ WALBERLA_FOR_ALL_CELLS(flagFieldIt, flagField, normalFieldIt, normalField, fillFieldIt, fillField, {
+ // skip non-interface cells
+ if (!isFlagSet(flagFieldIt, flagInfo.interfaceFlag)) { continue; }
+
+ // skip cells that have no solid cell in their neighborhood
+ if (!isFlagInNeighborhood< WettingStencil_T >(flagFieldIt, flagInfo.obstacleFlagMask)) { continue; }
+
+ // restrict maximal and minimal angle such that the surface continuation does not become too flat
+ if (*fillFieldIt < real_c(0.005) || *fillFieldIt > real_c(0.995)) { continue; }
+
+ const Vector3< real_t > interfacePointLocation = getInterfacePoint(*normalFieldIt, *fillFieldIt);
+
+ for (auto dir = WettingStencil_T::beginNoCenter(); dir != WettingStencil_T::end(); ++dir)
+ {
+ const Cell neighborCell =
+ Cell(flagFieldIt.x() + dir.cx(), flagFieldIt.y() + dir.cy(), flagFieldIt.z() + dir.cz());
+ const flag_t neighborFlag = flagField->get(neighborCell);
+
+ // skip neighboring cells that
+ // - are not liquid, gas or interface
+ // - are already marked for conversion to interface due to wetting
+ // IMPORTANT REMARK: It is crucial that interface cells are NOT skipped here. Since the
+ // "keepInterfaceForWettingFlag" flag is cleared in all cells after performing the conversion, interface cells
+ // that were converted due to wetting must still get this flag to avoid being prematurely converted back.
+ if (!isPartOfMaskSet(neighborFlag, liquidInterfaceGasFlagMask) ||
+ isFlagSet(neighborFlag, flagInfo.keepInterfaceForWettingFlag))
+ {
+ continue;
+ }
+
+ // skip neighboring cells that do not have solid cells in their neighborhood
+ bool hasObstacle = false;
+ for (auto dir2 = WettingStencil_T::beginNoCenter(); dir2 != WettingStencil_T::end(); ++dir2)
+ {
+ const Cell neighborNeighborCell =
+ Cell(flagFieldIt.x() + dir.cx() + dir2.cx(), flagFieldIt.y() + dir.cy() + dir2.cy(),
+ flagFieldIt.z() + dir.cz() + dir2.cz());
+ const flag_t neighborNeighborFlag = flagField->get(neighborNeighborCell);
+
+ if (isPartOfMaskSet(neighborNeighborFlag, flagInfo.obstacleFlagMask))
+ {
+ hasObstacle = true;
+ break; // exit dir2 loop
+ }
+ }
+ if (!hasObstacle) { continue; }
+
+ // check cell edges for intersection with the interface surface plane and mark the respective neighboring for
+ // conversion
+ // bottom south
+ if ((dir.cx() == 0 && dir.cy() == -1 && dir.cz() == -1) ||
+ (dir.cx() == 0 && dir.cy() == 0 && dir.cz() == -1) || (dir.cx() == 0 && dir.cy() == -1 && dir.cz() == 0))
+ {
+ const real_t intersection = getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(0), real_c(0)),
+ Vector3< real_t >(real_c(1), real_c(0), real_c(0)),
+ *normalFieldIt, interfacePointLocation);
+ if (intersection > real_c(0))
+ {
+ boundaryHandling->setFlag(flagInfo.keepInterfaceForWettingFlag, flagFieldIt.x() + dir.cx(),
+ flagFieldIt.y() + dir.cy(), flagFieldIt.z() + dir.cz());
+ continue;
+ }
+ }
+
+ // bottom north
+ if ((dir.cx() == 0 && dir.cy() == 1 && dir.cz() == -1) || (dir.cx() == 0 && dir.cy() == 0 && dir.cz() == -1) ||
+ (dir.cx() == 0 && dir.cy() == 1 && dir.cz() == 0))
+ {
+ const real_t intersection = getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(1), real_c(0)),
+ Vector3< real_t >(real_c(1), real_c(0), real_c(0)),
+ *normalFieldIt, interfacePointLocation);
+ if (intersection > real_c(0))
+ {
+ boundaryHandling->setFlag(flagInfo.keepInterfaceForWettingFlag, flagFieldIt.x() + dir.cx(),
+ flagFieldIt.y() + dir.cy(), flagFieldIt.z() + dir.cz());
+ continue;
+ }
+ }
+
+ // bottom west
+ if ((dir.cx() == -1 && dir.cy() == 0 && dir.cz() == -1) ||
+ (dir.cx() == 0 && dir.cy() == 0 && dir.cz() == -1) || (dir.cx() == -1 && dir.cy() == 0 && dir.cz() == 0))
+ {
+ const real_t intersection = getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(0), real_c(0)),
+ Vector3< real_t >(real_c(0), real_c(1), real_c(0)),
+ *normalFieldIt, interfacePointLocation);
+ if (intersection > real_c(0))
+ {
+ boundaryHandling->setFlag(flagInfo.keepInterfaceForWettingFlag, flagFieldIt.x() + dir.cx(),
+ flagFieldIt.y() + dir.cy(), flagFieldIt.z() + dir.cz());
+ continue;
+ }
+ }
+
+ // bottom east
+ if ((dir.cx() == 1 && dir.cy() == 0 && dir.cz() == -1) || (dir.cx() == 0 && dir.cy() == 0 && dir.cz() == -1) ||
+ (dir.cx() == 1 && dir.cy() == 0 && dir.cz() == 0))
+ {
+ const real_t intersection = getCellEdgeIntersection(Vector3< real_t >(real_c(1), real_c(0), real_c(0)),
+ Vector3< real_t >(real_c(0), real_c(1), real_c(0)),
+ *normalFieldIt, interfacePointLocation);
+ if (intersection > real_c(0))
+ {
+ boundaryHandling->setFlag(flagInfo.keepInterfaceForWettingFlag, flagFieldIt.x() + dir.cx(),
+ flagFieldIt.y() + dir.cy(), flagFieldIt.z() + dir.cz());
+ continue;
+ }
+ }
+
+ // top south
+ if ((dir.cx() == 0 && dir.cy() == -1 && dir.cz() == 1) || (dir.cx() == 0 && dir.cy() == 0 && dir.cz() == 1) ||
+ (dir.cx() == 0 && dir.cy() == -1 && dir.cz() == 0))
+ {
+ const real_t intersection = getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(0), real_c(1)),
+ Vector3< real_t >(real_c(1), real_c(0), real_c(0)),
+ *normalFieldIt, interfacePointLocation);
+ if (intersection > real_c(0))
+ {
+ boundaryHandling->setFlag(flagInfo.keepInterfaceForWettingFlag, flagFieldIt.x() + dir.cx(),
+ flagFieldIt.y() + dir.cy(), flagFieldIt.z() + dir.cz());
+ continue;
+ }
+ }
+
+ // top north
+ if ((dir.cx() == 0 && dir.cy() == 1 && dir.cz() == 1) || (dir.cx() == 0 && dir.cy() == 0 && dir.cz() == 1) ||
+ (dir.cx() == 0 && dir.cy() == 1 && dir.cz() == 0))
+ {
+ const real_t intersection = getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(1), real_c(1)),
+ Vector3< real_t >(real_c(1), real_c(0), real_c(0)),
+ *normalFieldIt, interfacePointLocation);
+ if (intersection > real_c(0))
+ {
+ boundaryHandling->setFlag(flagInfo.keepInterfaceForWettingFlag, flagFieldIt.x() + dir.cx(),
+ flagFieldIt.y() + dir.cy(), flagFieldIt.z() + dir.cz());
+ continue;
+ }
+ }
+
+ // top west
+ if ((dir.cx() == -1 && dir.cy() == 0 && dir.cz() == 1) || (dir.cx() == 0 && dir.cy() == 0 && dir.cz() == 1) ||
+ (dir.cx() == -1 && dir.cy() == 0 && dir.cz() == 0))
+ {
+ const real_t intersection = getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(0), real_c(1)),
+ Vector3< real_t >(real_c(0), real_c(1), real_c(0)),
+ *normalFieldIt, interfacePointLocation);
+ if (intersection > real_c(0))
+ {
+ boundaryHandling->setFlag(flagInfo.keepInterfaceForWettingFlag, flagFieldIt.x() + dir.cx(),
+ flagFieldIt.y() + dir.cy(), flagFieldIt.z() + dir.cz());
+ continue;
+ }
+ }
+
+ // top east
+ if ((dir.cx() == 1 && dir.cy() == 0 && dir.cz() == 1) || (dir.cx() == 0 && dir.cy() == 0 && dir.cz() == 1) ||
+ (dir.cx() == 1 && dir.cy() == 0 && dir.cz() == 0))
+ {
+ const real_t intersection = getCellEdgeIntersection(Vector3< real_t >(real_c(1), real_c(0), real_c(1)),
+ Vector3< real_t >(real_c(0), real_c(1), real_c(0)),
+ *normalFieldIt, interfacePointLocation);
+ if (intersection > real_c(0))
+ {
+ boundaryHandling->setFlag(flagInfo.keepInterfaceForWettingFlag, flagFieldIt.x() + dir.cx(),
+ flagFieldIt.y() + dir.cy(), flagFieldIt.z() + dir.cz());
+ continue;
+ }
+ }
+
+ // south-west
+ if ((dir.cx() == -1 && dir.cy() == -1 && dir.cz() == 0) ||
+ (dir.cx() == 0 && dir.cy() == -1 && dir.cz() == 0) || (dir.cx() == -1 && dir.cy() == 0 && dir.cz() == 0))
+ {
+ const real_t intersection = getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(0), real_c(0)),
+ Vector3< real_t >(real_c(0), real_c(0), real_c(1)),
+ *normalFieldIt, interfacePointLocation);
+ if (intersection > real_c(0))
+ {
+ boundaryHandling->setFlag(flagInfo.keepInterfaceForWettingFlag, flagFieldIt.x() + dir.cx(),
+ flagFieldIt.y() + dir.cy(), flagFieldIt.z() + dir.cz());
+ continue;
+ }
+ }
+
+ // south-east
+ if ((dir.cx() == 1 && dir.cy() == -1 && dir.cz() == 0) || (dir.cx() == 0 && dir.cy() == -1 && dir.cz() == 0) ||
+ (dir.cx() == 1 && dir.cy() == 0 && dir.cz() == 0))
+ {
+ const real_t intersection = getCellEdgeIntersection(Vector3< real_t >(real_c(1), real_c(0), real_c(0)),
+ Vector3< real_t >(real_c(0), real_c(0), real_c(1)),
+ *normalFieldIt, interfacePointLocation);
+ if (intersection > real_c(0))
+ {
+ boundaryHandling->setFlag(flagInfo.keepInterfaceForWettingFlag, flagFieldIt.x() + dir.cx(),
+ flagFieldIt.y() + dir.cy(), flagFieldIt.z() + dir.cz());
+ continue;
+ }
+ }
+
+ // north-west
+ if ((dir.cx() == -1 && dir.cy() == 1 && dir.cz() == 0) || (dir.cx() == 0 && dir.cy() == 1 && dir.cz() == 0) ||
+ (dir.cx() == -1 && dir.cy() == 0 && dir.cz() == 0))
+ {
+ const real_t intersection = getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(1), real_c(0)),
+ Vector3< real_t >(real_c(0), real_c(0), real_c(1)),
+ *normalFieldIt, interfacePointLocation);
+ if (intersection > real_c(0))
+ {
+ boundaryHandling->setFlag(flagInfo.keepInterfaceForWettingFlag, flagFieldIt.x() + dir.cx(),
+ flagFieldIt.y() + dir.cy(), flagFieldIt.z() + dir.cz());
+ continue;
+ }
+ }
+
+ // north-east
+ if ((dir.cx() == 1 && dir.cy() == 1 && dir.cz() == 0) || (dir.cx() == 0 && dir.cy() == 1 && dir.cz() == 0) ||
+ (dir.cx() == 1 && dir.cy() == 0 && dir.cz() == 0))
+ {
+ const real_t intersection = getCellEdgeIntersection(Vector3< real_t >(real_c(1), real_c(1), real_c(0)),
+ Vector3< real_t >(real_c(0), real_c(0), real_c(1)),
+ *normalFieldIt, interfacePointLocation);
+ if (intersection > real_c(0))
+ {
+ boundaryHandling->setFlag(flagInfo.keepInterfaceForWettingFlag, flagFieldIt.x() + dir.cx(),
+ flagFieldIt.y() + dir.cy(), flagFieldIt.z() + dir.cz());
+ continue;
+ }
+ }
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+}
+
+} // namespace free_surface
+} // namespace walberla
\ No newline at end of file
diff --git a/src/lbm/free_surface/surface_geometry/ExtrapolateNormalsSweep.h b/src/lbm/free_surface/surface_geometry/ExtrapolateNormalsSweep.h
new file mode 100644
index 0000000000000000000000000000000000000000..8d49e0c963fd6aaa96fc85d6abaa782a8600cf1e
--- /dev/null
+++ b/src/lbm/free_surface/surface_geometry/ExtrapolateNormalsSweep.h
@@ -0,0 +1,71 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file ExtrapolateNormalsSweep.h
+//! \ingroup surface_geometry
+//! \author Martin Bauer
+//! \author Matthias Markl <matthias.markl@fau.de>
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Extrapolate interface normals to neighboring cells in D3Q27 direction.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "domain_decomposition/BlockDataID.h"
+
+#include "field/FlagField.h"
+
+#include <type_traits>
+#include <vector>
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Approximates the normals of non-interface cells using the normals of all neighboring interface cells in D3Q27
+ * direction.
+ * The approximation is computed by summing the weighted normals of all neighboring interface cells. The weights are
+ * chosen as in the Parker-Youngs approximation.
+ **********************************************************************************************************************/
+template< typename Stencil_T, typename FlagField_T, typename VectorField_T >
+class ExtrapolateNormalsSweep
+{
+ protected:
+ using FlagUIDSet = Set< FlagUID >;
+
+ using vector_t = typename std::remove_const< typename VectorField_T::value_type >::type;
+ using flag_t = typename std::remove_const< typename FlagField_T::value_type >::type;
+
+ public:
+ ExtrapolateNormalsSweep(const BlockDataID& normalFieldID, const ConstBlockDataID& flagFieldID,
+ const FlagUID& interfaceFlagID)
+ : normalFieldID_(normalFieldID), flagFieldID_(flagFieldID), interfaceFlagID_(interfaceFlagID)
+ {}
+
+ void operator()(IBlock* const block);
+
+ private:
+ BlockDataID normalFieldID_;
+ ConstBlockDataID flagFieldID_;
+
+ FlagUID interfaceFlagID_;
+}; // class ExtrapolateNormalsSweep
+
+} // namespace free_surface
+} // namespace walberla
+
+#include "ExtrapolateNormalsSweep.impl.h"
\ No newline at end of file
diff --git a/src/lbm/free_surface/surface_geometry/ExtrapolateNormalsSweep.impl.h b/src/lbm/free_surface/surface_geometry/ExtrapolateNormalsSweep.impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..309bc79bb5c9868243c156e04f462f1e649cf790
--- /dev/null
+++ b/src/lbm/free_surface/surface_geometry/ExtrapolateNormalsSweep.impl.h
@@ -0,0 +1,70 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file ExtrapolateNormalsSweep.impl.h
+//! \ingroup surface_geometry
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Extrapolate interface normals to neighboring cells in D3Q27 direction.
+//
+//======================================================================================================================
+
+#include "core/math/Vector3.h"
+
+#include "field/GhostLayerField.h"
+
+#include "stencil/D3Q27.h"
+
+#include "ExtrapolateNormalsSweep.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+template< typename Stencil_T, typename FlagField_T, typename VectorField_T >
+void ExtrapolateNormalsSweep< Stencil_T, FlagField_T, VectorField_T >::operator()(IBlock* const block)
+{
+ VectorField_T* const normalField = block->getData< VectorField_T >(normalFieldID_);
+ const FlagField_T* const flagField = block->getData< const FlagField_T >(flagFieldID_);
+
+ const auto interfaceFlag = flagField->getFlag(interfaceFlagID_);
+
+ // compute normals in interface neighboring cells, i.e., in D3Q27 direction of interface cells
+ WALBERLA_FOR_ALL_CELLS(flagFieldIt, flagField, normalFieldIt, normalField, {
+ if (!isFlagSet(flagFieldIt, interfaceFlag) && isFlagInNeighborhood< stencil::D3Q27 >(flagFieldIt, interfaceFlag))
+ {
+ uint_t count = uint_c(0);
+ vector_t& normal = *normalFieldIt;
+ normal.set(real_c(0), real_c(0), real_c(0));
+
+ // approximate the normal of non-interface cells with the normal of neighboring interface cells (weights as
+ // in Parker-Youngs approximation)
+ for (auto i = Stencil_T::beginNoCenter(); i != Stencil_T::end(); ++i)
+ {
+ if (isFlagSet(flagFieldIt.neighbor(*i), interfaceFlag))
+ {
+ normal += real_c(stencil::gaussianMultipliers[i.toIdx()]) * normalFieldIt.neighbor(*i);
+ ++count;
+ }
+ }
+
+ // normalize the normal
+ normal = normal.getNormalizedOrZero();
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+}
+
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/surface_geometry/NormalSweep.h b/src/lbm/free_surface/surface_geometry/NormalSweep.h
new file mode 100644
index 0000000000000000000000000000000000000000..75cc8b6d91ce5aa8a781fec2b83dae75a93231d9
--- /dev/null
+++ b/src/lbm/free_surface/surface_geometry/NormalSweep.h
@@ -0,0 +1,109 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file NormalSweep.h
+//! \ingroup surface_geometry
+//! \author Martin Bauer <martin.bauer@fau.de>
+//! \author Daniela Anderl
+//! \author Stefan Donath
+//! \author Matthias Markl <matthias.markl@fau.de>
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Compute interface normal.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "domain_decomposition/BlockDataID.h"
+
+#include "field/FlagField.h"
+
+#include <type_traits>
+#include <vector>
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Compute normals in interface cells by taking the derivative of the fill level field using the Parker-Youngs
+ * approximation. Near boundary cells, a modified Parker-Youngs approximation is applied with the cell being shifted by
+ * 0.5 away from the boundary.
+ *
+ * Details can be found in the Dissertation of S. Donath, page 21f.
+ *
+ * IMPORTANT REMARK: In this FSLBM implementation, the normal is defined to point from liquid to gas.
+ *
+ * More general: compute the gradient of a given scalar field on cells that are marked with a specific flag.
+ **********************************************************************************************************************/
+
+template< typename Stencil_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+class NormalSweep
+{
+ protected:
+ using vector_t = typename std::remove_const< typename VectorField_T::value_type >::type;
+ using scalar_t = typename std::remove_const< typename ScalarField_T::value_type >::type;
+ using flag_t = typename std::remove_const< typename FlagField_T::value_type >::type;
+
+ public:
+ NormalSweep(const BlockDataID& normalFieldID, const ConstBlockDataID& fillFieldID,
+ const ConstBlockDataID& flagFieldID, const FlagUID& interfaceFlagID,
+ const Set< FlagUID >& liquidInterfaceGasFlagIDSet, const Set< FlagUID >& obstacleFlagIDSet,
+ bool computeInInterfaceNeighbors, bool includeObstacleNeighbors, bool modifyNearObstacles,
+ bool computeInGhostLayer)
+ : normalFieldID_(normalFieldID), fillFieldID_(fillFieldID), flagFieldID_(flagFieldID),
+ interfaceFlagID_(interfaceFlagID), liquidInterfaceGasFlagIDSet_(liquidInterfaceGasFlagIDSet),
+ obstacleFlagIDSet_(obstacleFlagIDSet), computeInInterfaceNeighbors_(computeInInterfaceNeighbors),
+ includeObstacleNeighbors_(includeObstacleNeighbors), modifyNearObstacles_(modifyNearObstacles),
+ computeInGhostLayer_(computeInGhostLayer)
+ {}
+
+ void operator()(IBlock* const block);
+
+ private:
+ BlockDataID normalFieldID_;
+ ConstBlockDataID fillFieldID_;
+ ConstBlockDataID flagFieldID_;
+
+ FlagUID interfaceFlagID_;
+ Set< FlagUID > liquidInterfaceGasFlagIDSet_;
+ Set< FlagUID > obstacleFlagIDSet_;
+
+ bool computeInInterfaceNeighbors_;
+ bool includeObstacleNeighbors_;
+ bool modifyNearObstacles_;
+ bool computeInGhostLayer_;
+}; // class NormalSweep
+
+// namespace to use these functions outside NormalSweep, e.g., in ReinitializationSweep
+namespace normal_computation
+{
+// compute the normal using Parker-Youngs approximation (see dissertation of S. Donath, 2011, section 2.3.3.1.1)
+template< typename Stencil_T, typename vector_t, typename ScalarFieldIt_T, typename FlagFieldIt_T, typename flag_t >
+void computeNormal(vector_t& normal, const ScalarFieldIt_T& fillFieldIt, const FlagFieldIt_T& flagFieldIt,
+ const flag_t& validNeighborFlagMask);
+
+// near solid boundary cells, compute a Parker-Youngs approximation around a virtual (constructed) midpoint that is
+// displaced by a distance of 0.5 away from the boundary (see dissertation of S. Donath, 2011, section 6.3.5.1)
+template< typename Stencil_T, typename vector_t, typename ScalarFieldIt_T, typename FlagFieldIt_T, typename flag_t >
+void computeNormalNearSolidBoundary(vector_t& normal, const ScalarFieldIt_T& fillFieldIt,
+ const FlagFieldIt_T& flagFieldIt, const flag_t& validNeighborFlagMask,
+ const flag_t& obstacleFlagMask);
+} // namespace normal_computation
+
+} // namespace free_surface
+} // namespace walberla
+
+#include "NormalSweep.impl.h"
\ No newline at end of file
diff --git a/src/lbm/free_surface/surface_geometry/NormalSweep.impl.h b/src/lbm/free_surface/surface_geometry/NormalSweep.impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..a1ade27ec0021d29497258101212e29c06ad9395
--- /dev/null
+++ b/src/lbm/free_surface/surface_geometry/NormalSweep.impl.h
@@ -0,0 +1,456 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file NormalSweep.impl.h
+//! \ingroup surface_geometry
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Compute interface normal.
+//
+//======================================================================================================================
+
+#include "core/logging/Logging.h"
+#include "core/math/Vector3.h"
+
+#include "field/iterators/IteratorMacros.h"
+
+#include "stencil/D2Q9.h"
+#include "stencil/D3Q19.h"
+#include "stencil/D3Q27.h"
+
+#include <type_traits>
+
+#include "NormalSweep.h"
+namespace walberla
+{
+namespace free_surface
+{
+
+template< typename Stencil_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+void NormalSweep< Stencil_T, FlagField_T, ScalarField_T, VectorField_T >::operator()(IBlock* const block)
+{
+ // fetch fields
+ VectorField_T* const normalField = block->getData< VectorField_T >(normalFieldID_);
+ const ScalarField_T* const fillField = block->getData< const ScalarField_T >(fillFieldID_);
+ const FlagField_T* const flagField = block->getData< const FlagField_T >(flagFieldID_);
+
+ // two ghost layers are required in the flag field
+ WALBERLA_ASSERT_EQUAL(flagField->nrOfGhostLayers(), uint_c(2));
+
+ // get flags
+ const flag_t interfaceFlag = flagField->getFlag(interfaceFlagID_);
+ const flag_t liquidInterfaceGasFlagMask = flagField->getMask(liquidInterfaceGasFlagIDSet_);
+ const flag_t obstacleFlagMask = flagField->getMask(obstacleFlagIDSet_);
+
+ // evaluate flags in D2Q19 neighborhood for 2D, and in D3Q27 neighborhood for 3D simulations
+ using NeighborhoodStencil_T =
+ typename std::conditional< Stencil_T::D == uint_t(2), stencil::D2Q9, stencil::D3Q27 >::type;
+
+ // include ghost layer because solid cells might be located in the (outermost global) ghost layer
+ WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ(normalField, uint_c(1), {
+ if (!computeInGhostLayer_ && (!flagField->isInInnerPart(Cell(x, y, z)))) { continue; }
+
+ const typename FlagField_T::ConstPtr flagFieldPtr(*flagField, x, y, z);
+ const typename ScalarField_T::ConstPtr fillFieldPtr(*fillField, x, y, z);
+
+ const bool computeNormalInCell =
+ isFlagSet(flagFieldPtr, interfaceFlag) ||
+ (computeInInterfaceNeighbors_ && isFlagInNeighborhood< NeighborhoodStencil_T >(flagFieldPtr, interfaceFlag));
+
+ vector_t& normal = normalField->get(x, y, z);
+
+ if (computeNormalInCell)
+ {
+ if (includeObstacleNeighbors_)
+ {
+ // requires meaningful fill level values in obstacle cells, as set by ObstacleFillLevelSweep when using
+ // curvature computation via the finite difference method
+ normal_computation::computeNormal< Stencil_T >(normal, fillFieldPtr, flagFieldPtr,
+ liquidInterfaceGasFlagMask | obstacleFlagMask);
+ }
+ else
+ {
+ if (modifyNearObstacles_ && isFlagInNeighborhood< Stencil_T >(flagFieldPtr, obstacleFlagMask))
+ {
+ // near solid boundary cells, compute a Parker-Youngs approximation around a virtual (constructed)
+ // midpoint that is displaced by a distance of 0.5 away from the boundary (see dissertation of S. Donath,
+ // 2011, section 6.3.5.1); use only for curvature computation based on local triangulation
+ normal_computation::computeNormalNearSolidBoundary< Stencil_T >(
+ normal, fillFieldPtr, flagFieldPtr, liquidInterfaceGasFlagMask, obstacleFlagMask);
+ }
+ else
+ {
+ normal_computation::computeNormal< Stencil_T >(normal, fillFieldPtr, flagFieldPtr,
+ liquidInterfaceGasFlagMask);
+ }
+ }
+
+ // normalize and negate normal (to make it point from liquid to gas)
+ normal = real_c(-1) * normal.getNormalizedOrZero();
+ }
+ else { normal.set(real_c(0), real_c(0), real_c(0)); }
+ }); // WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ
+}
+
+namespace normal_computation
+{
+template< typename Stencil_T, typename vector_t, typename ScalarFieldIt_T, typename FlagFieldIt_T, typename flag_t >
+void computeNormal(vector_t& normal, const ScalarFieldIt_T& fillFieldIt, const FlagFieldIt_T& flagFieldIt,
+ const flag_t& validNeighborFlagMask)
+{
+ // All computations are performed in double precision here (and truncated later). This is done to avoid an issue
+ // observed with the Intel 19 compiler when built in "DebugOptimized" mode with single precision. There, the result
+ // is dependent on the order of the "tmp_*" variables' definitions. It is assumed that an Intel-specific optimization
+ // leads to floating point inaccuracies.
+ normal = vector_t(real_c(0));
+
+ // avoid accessing neighbors that are out-of-range, i.e., restrict neighbor access to first ghost layer
+ const bool useW = flagFieldIt.x() >= cell_idx_c(0);
+ const bool useE = flagFieldIt.x() < cell_idx_c(flagFieldIt.getField()->xSize());
+ const bool useS = flagFieldIt.y() >= cell_idx_c(0);
+ const bool useN = flagFieldIt.y() < cell_idx_c(flagFieldIt.getField()->ySize());
+
+ // loops are unrolled for improved computational performance
+ // IMPORTANT REMARK: the non-unrolled implementation was observed to give different results at O(1e-15); this
+ // accumulated and lead to inaccuracies, e.g., a drop wetting a surface became asymmetrical and started to move
+ // sideways
+ if constexpr (std::is_same_v< Stencil_T, stencil::D2Q9 >)
+ {
+ // get fill level in neighboring cells
+ const double tmp_S = useS && isPartOfMaskSet(flagFieldIt.neighbor(0, -1, 0), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(0, -1, 0)) :
+ static_cast< double >(0);
+ const double tmp_N = useN && isPartOfMaskSet(flagFieldIt.neighbor(0, 1, 0), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(0, 1, 0)) :
+ static_cast< double >(0);
+ const double tmp_W = useW && isPartOfMaskSet(flagFieldIt.neighbor(-1, 0, 0), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(-1, 0, 0)) :
+ static_cast< double >(0);
+ const double tmp_E = useE && isPartOfMaskSet(flagFieldIt.neighbor(1, 0, 0), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(1, 0, 0)) :
+ static_cast< double >(0);
+ const double tmp_SW = useS && useW && isPartOfMaskSet(flagFieldIt.neighbor(-1, -1, 0), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(-1, -1, 0)) :
+ static_cast< double >(0);
+ const double tmp_SE = useS && useE && isPartOfMaskSet(flagFieldIt.neighbor(1, -1, 0), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(1, -1, 0)) :
+ static_cast< double >(0);
+ const double tmp_NW = useN && useW && isPartOfMaskSet(flagFieldIt.neighbor(-1, 1, 0), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(-1, 1, 0)) :
+ static_cast< double >(0);
+ const double tmp_NE = useN && useE && isPartOfMaskSet(flagFieldIt.neighbor(1, 1, 0), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(1, 1, 0)) :
+ static_cast< double >(0);
+
+ // compute normal with Parker-Youngs approximation (PY)
+ const double weight_1 = real_c(4);
+ normal[0] = real_c(weight_1 * (tmp_E - tmp_W));
+ normal[1] = real_c(weight_1 * (tmp_N - tmp_S));
+ normal[2] = real_c(0);
+
+ const double weight_2 = real_c(2);
+ normal[0] += real_c(weight_2 * ((tmp_NE + tmp_SE) - (tmp_NW + tmp_SW)));
+ normal[1] += real_c(weight_2 * ((tmp_NE + tmp_NW) - (tmp_SE + tmp_SW)));
+ }
+ else
+ {
+ const bool useB = flagFieldIt.z() >= cell_idx_c(0);
+ const bool useT = flagFieldIt.z() < cell_idx_c(flagFieldIt.getField()->zSize());
+
+ if constexpr (std::is_same_v< Stencil_T, stencil::D3Q19 >)
+ {
+ // get fill level in neighboring cells
+ const double tmp_S = useS && isPartOfMaskSet(flagFieldIt.neighbor(0, -1, 0), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(0, -1, 0)) :
+ static_cast< double >(0);
+ const double tmp_N = useN && isPartOfMaskSet(flagFieldIt.neighbor(0, 1, 0), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(0, 1, 0)) :
+ static_cast< double >(0);
+ const double tmp_W = useW && isPartOfMaskSet(flagFieldIt.neighbor(-1, 0, 0), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(-1, 0, 0)) :
+ static_cast< double >(0);
+ const double tmp_E = useE && isPartOfMaskSet(flagFieldIt.neighbor(1, 0, 0), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(1, 0, 0)) :
+ static_cast< double >(0);
+ const double tmp_SW = useS && useW && isPartOfMaskSet(flagFieldIt.neighbor(-1, -1, 0), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(-1, -1, 0)) :
+ static_cast< double >(0);
+ const double tmp_SE = useS && useE && isPartOfMaskSet(flagFieldIt.neighbor(1, -1, 0), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(1, -1, 0)) :
+ static_cast< double >(0);
+ const double tmp_NW = useN && useW && isPartOfMaskSet(flagFieldIt.neighbor(-1, 1, 0), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(-1, 1, 0)) :
+ static_cast< double >(0);
+ const double tmp_NE = useN && useE && isPartOfMaskSet(flagFieldIt.neighbor(1, 1, 0), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(1, 1, 0)) :
+ static_cast< double >(0);
+ const double tmp_B = useB && isPartOfMaskSet(flagFieldIt.neighbor(0, 0, -1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(0, 0, -1)) :
+ static_cast< double >(0);
+ const double tmp_T = useT && isPartOfMaskSet(flagFieldIt.neighbor(0, 0, 1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(0, 0, 1)) :
+ static_cast< double >(0);
+ const double tmp_BS = useB && useS && isPartOfMaskSet(flagFieldIt.neighbor(0, -1, -1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(0, -1, -1)) :
+ static_cast< double >(0);
+ const double tmp_BN = useB && useN && isPartOfMaskSet(flagFieldIt.neighbor(0, 1, -1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(0, 1, -1)) :
+ static_cast< double >(0);
+ const double tmp_BW = useB && useW && isPartOfMaskSet(flagFieldIt.neighbor(-1, 0, -1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(-1, 0, -1)) :
+ static_cast< double >(0);
+ const double tmp_BE = useB && useE && isPartOfMaskSet(flagFieldIt.neighbor(1, 0, -1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(1, 0, -1)) :
+ static_cast< double >(0);
+ const double tmp_TS = useT && useS && isPartOfMaskSet(flagFieldIt.neighbor(0, -1, 1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(0, -1, 1)) :
+ static_cast< double >(0);
+ const double tmp_TN = useT && useN && isPartOfMaskSet(flagFieldIt.neighbor(0, 1, 1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(0, 1, 1)) :
+ static_cast< double >(0);
+ const double tmp_TW = useT && useW && isPartOfMaskSet(flagFieldIt.neighbor(-1, 0, 1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(-1, 0, 1)) :
+ static_cast< double >(0);
+ const double tmp_TE = useT && useE && isPartOfMaskSet(flagFieldIt.neighbor(1, 0, 1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(1, 0, 1)) :
+ static_cast< double >(0);
+
+ // compute normal with Parker-Youngs approximation (PY)
+ const double weight_1 = real_c(4);
+ normal[0] = real_c(weight_1 * (tmp_E - tmp_W));
+ normal[1] = real_c(weight_1 * (tmp_N - tmp_S));
+ normal[2] = real_c(weight_1 * (tmp_T - tmp_B));
+
+ const double weight_2 = real_c(2);
+ normal[0] += real_c(weight_2 * ((tmp_NE + tmp_SE + tmp_TE + tmp_BE) - (tmp_NW + tmp_SW + tmp_TW + tmp_BW)));
+ normal[1] += real_c(weight_2 * ((tmp_NE + tmp_NW + tmp_TN + tmp_BN) - (tmp_SE + tmp_SW + tmp_TS + tmp_BS)));
+ normal[2] += real_c(weight_2 * ((tmp_TN + tmp_TS + tmp_TE + tmp_TW) - (tmp_BN + tmp_BS + tmp_BE + tmp_BW)));
+ }
+ else
+ {
+ if constexpr (std::is_same_v< Stencil_T, stencil::D3Q27 >)
+ {
+ // get fill level in neighboring cells
+ const double tmp_S = useS && isPartOfMaskSet(flagFieldIt.neighbor(0, -1, 0), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(0, -1, 0)) :
+ static_cast< double >(0);
+ const double tmp_N = useN && isPartOfMaskSet(flagFieldIt.neighbor(0, 1, 0), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(0, 1, 0)) :
+ static_cast< double >(0);
+ const double tmp_W = useW && isPartOfMaskSet(flagFieldIt.neighbor(-1, 0, 0), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(-1, 0, 0)) :
+ static_cast< double >(0);
+ const double tmp_E = useE && isPartOfMaskSet(flagFieldIt.neighbor(1, 0, 0), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(1, 0, 0)) :
+ static_cast< double >(0);
+ const double tmp_SW =
+ useS && useW && isPartOfMaskSet(flagFieldIt.neighbor(-1, -1, 0), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(-1, -1, 0)) :
+ static_cast< double >(0);
+ const double tmp_SE =
+ useS && useE && isPartOfMaskSet(flagFieldIt.neighbor(1, -1, 0), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(1, -1, 0)) :
+ static_cast< double >(0);
+ const double tmp_NW =
+ useN && useW && isPartOfMaskSet(flagFieldIt.neighbor(-1, 1, 0), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(-1, 1, 0)) :
+ static_cast< double >(0);
+ const double tmp_NE =
+ useN && useE && isPartOfMaskSet(flagFieldIt.neighbor(1, 1, 0), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(1, 1, 0)) :
+ static_cast< double >(0);
+ const double tmp_B = useB && isPartOfMaskSet(flagFieldIt.neighbor(0, 0, -1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(0, 0, -1)) :
+ static_cast< double >(0);
+ const double tmp_T = useT && isPartOfMaskSet(flagFieldIt.neighbor(0, 0, 1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(0, 0, 1)) :
+ static_cast< double >(0);
+ const double tmp_BS =
+ useB && useS && isPartOfMaskSet(flagFieldIt.neighbor(0, -1, -1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(0, -1, -1)) :
+ static_cast< double >(0);
+ const double tmp_BN =
+ useB && useN && isPartOfMaskSet(flagFieldIt.neighbor(0, 1, -1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(0, 1, -1)) :
+ static_cast< double >(0);
+ const double tmp_BW =
+ useB && useW && isPartOfMaskSet(flagFieldIt.neighbor(-1, 0, -1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(-1, 0, -1)) :
+ static_cast< double >(0);
+ const double tmp_BE =
+ useB && useE && isPartOfMaskSet(flagFieldIt.neighbor(1, 0, -1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(1, 0, -1)) :
+ static_cast< double >(0);
+ const double tmp_TS =
+ useT && useS && isPartOfMaskSet(flagFieldIt.neighbor(0, -1, 1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(0, -1, 1)) :
+ static_cast< double >(0);
+ const double tmp_TN =
+ useT && useN && isPartOfMaskSet(flagFieldIt.neighbor(0, 1, 1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(0, 1, 1)) :
+ static_cast< double >(0);
+ const double tmp_TW =
+ useT && useW && isPartOfMaskSet(flagFieldIt.neighbor(-1, 0, 1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(-1, 0, 1)) :
+ static_cast< double >(0);
+ const double tmp_TE =
+ useT && useE && isPartOfMaskSet(flagFieldIt.neighbor(1, 0, 1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(1, 0, 1)) :
+ static_cast< double >(0);
+ const double tmp_BSW =
+ useB && useS && useW && isPartOfMaskSet(flagFieldIt.neighbor(-1, -1, -1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(-1, -1, -1)) :
+ static_cast< double >(0);
+ const double tmp_BNW =
+ useB && useN && useW && isPartOfMaskSet(flagFieldIt.neighbor(-1, 1, -1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(-1, 1, -1)) :
+ static_cast< double >(0);
+ const double tmp_BSE =
+ useB && useS && useE && isPartOfMaskSet(flagFieldIt.neighbor(1, -1, -1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(1, -1, -1)) :
+ static_cast< double >(0);
+ const double tmp_BNE =
+ useB && useN && useE && isPartOfMaskSet(flagFieldIt.neighbor(1, 1, -1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(1, 1, -1)) :
+ static_cast< double >(0);
+ const double tmp_TSW =
+ useT && useS && useW && isPartOfMaskSet(flagFieldIt.neighbor(-1, -1, 1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(-1, -1, 1)) :
+ static_cast< double >(0);
+ const double tmp_TNW =
+ useT && useN && useW && isPartOfMaskSet(flagFieldIt.neighbor(-1, 1, 1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(-1, 1, 1)) :
+ static_cast< double >(0);
+ const double tmp_TSE =
+ useT && useS && useE && isPartOfMaskSet(flagFieldIt.neighbor(1, -1, 1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(1, -1, 1)) :
+ static_cast< double >(0);
+ const double tmp_TNE =
+ useT && useN && useE && isPartOfMaskSet(flagFieldIt.neighbor(1, 1, 1), validNeighborFlagMask) ?
+ static_cast< double >(fillFieldIt.neighbor(1, 1, 1)) :
+ static_cast< double >(0);
+
+ // compute normal with Parker-Youngs approximation (PY)
+ const double weight_1 = real_c(4);
+ normal[0] = real_c(weight_1 * (tmp_E - tmp_W));
+ normal[1] = real_c(weight_1 * (tmp_N - tmp_S));
+ normal[2] = real_c(weight_1 * (tmp_T - tmp_B));
+
+ const double weight_2 = real_c(2);
+ normal[0] += real_c(weight_2 * ((tmp_NE + tmp_SE + tmp_TE + tmp_BE) - (tmp_NW + tmp_SW + tmp_TW + tmp_BW)));
+ normal[1] += real_c(weight_2 * ((tmp_NE + tmp_NW + tmp_TN + tmp_BN) - (tmp_SE + tmp_SW + tmp_TS + tmp_BS)));
+ normal[2] += real_c(weight_2 * ((tmp_TN + tmp_TS + tmp_TE + tmp_TW) - (tmp_BN + tmp_BS + tmp_BE + tmp_BW)));
+
+ // weight (=1) corresponding to Parker-Youngs approximation
+ normal[0] += real_c((tmp_TNE + tmp_TSE + tmp_BNE + tmp_BSE) - (tmp_TNW + tmp_TSW + tmp_BNW + tmp_BSW));
+ normal[1] += real_c((tmp_TNE + tmp_TNW + tmp_BNE + tmp_BNW) - (tmp_TSE + tmp_TSW + tmp_BSE + tmp_BSW));
+ normal[2] += real_c((tmp_TNE + tmp_TNW + tmp_TSE + tmp_TSW) - (tmp_BNE + tmp_BNW + tmp_BSE + tmp_BSW));
+ }
+ else { WALBERLA_ABORT("The chosen stencil type is not implemented in computeNormal()."); }
+ }
+ }
+}
+
+template< typename Stencil_T, typename vector_t, typename ScalarFieldIt_T, typename FlagFieldIt_T, typename flag_t >
+void computeNormalNearSolidBoundary(vector_t& normal, const ScalarFieldIt_T& fillFieldIt,
+ const FlagFieldIt_T& flagFieldIt, const flag_t& validNeighborFlagMask,
+ const flag_t& obstacleFlagMask)
+{
+ Vector3< real_t > midPoint(real_c(0));
+
+ // construct the virtual midpoint
+ for (auto dir = Stencil_T::beginNoCenter(); dir != Stencil_T::end(); ++dir)
+ {
+ if (isPartOfMaskSet(flagFieldIt.neighbor(*dir), validNeighborFlagMask) &&
+ isPartOfMaskSet(flagFieldIt.neighbor(dir.inverseDir()), obstacleFlagMask))
+ {
+ if constexpr (Stencil_T::D == uint_t(2))
+ {
+ midPoint[0] += real_c(dir.cx()) *
+ real_c(stencil::gaussianMultipliers[stencil::D3Q27::idx[stencil::map2Dto3D[2][*dir]]]);
+ midPoint[1] += real_c(dir.cy()) *
+ real_c(stencil::gaussianMultipliers[stencil::D3Q27::idx[stencil::map2Dto3D[2][*dir]]]);
+ midPoint[2] += real_c(0);
+ }
+ else
+ {
+ midPoint[0] += real_c(dir.cx()) * real_c(stencil::gaussianMultipliers[dir.toIdx()]);
+ midPoint[1] += real_c(dir.cy()) * real_c(stencil::gaussianMultipliers[dir.toIdx()]);
+ midPoint[2] += real_c(dir.cz()) * real_c(stencil::gaussianMultipliers[dir.toIdx()]);
+ }
+ }
+ }
+
+ // restrict the displacement of the virtual midpoint to an absolute value of 0.5
+ for (uint_t i = uint_c(0); i != uint_c(3); ++i)
+ {
+ if (midPoint[i] > real_c(0.0)) { midPoint[i] = real_c(0.5); }
+ else
+ {
+ if (midPoint[i] < real_c(0.0)) { midPoint[i] = real_c(-0.5); }
+ // else midPoint[i] == 0
+ }
+ }
+
+ normal.set(real_c(0), real_c(0), real_c(0));
+
+ // use standard Parker-Youngs approximation (PY) for all cells without solid boundary neighbors
+ // otherwise shift neighboring cell by virtual midpoint (also referred to as narrower PY)
+ for (auto dir = Stencil_T::beginNoCenter(); dir != Stencil_T::end(); ++dir)
+ {
+ // skip directions that have obstacleFlagMask set in this and the opposing direction; this is NOT documented in
+ // literature, however, it avoids that an undefined fill level is used from the wall cells
+ if (isPartOfMaskSet(flagFieldIt.neighbor(*dir), obstacleFlagMask) &&
+ isPartOfMaskSet(flagFieldIt.neighbor(dir.inverseDir()), obstacleFlagMask))
+ {
+ continue;
+ }
+
+ cell_idx_t modCx = dir.cx();
+ cell_idx_t modCy = dir.cy();
+ cell_idx_t modCz = dir.cz();
+
+ // shift neighboring cells by midpoint if they are solid boundary cells
+ if (isPartOfMaskSet(flagFieldIt.neighbor(*dir), obstacleFlagMask) ||
+ isPartOfMaskSet(flagFieldIt.neighbor(dir.inverseDir()), obstacleFlagMask))
+ {
+ // truncate cells towards 0, i.e., make the access pattern narrower
+ modCx = cell_idx_c(real_c(modCx) + midPoint[0]);
+ modCy = cell_idx_c(real_c(modCy) + midPoint[1]);
+ modCz = cell_idx_c(real_c(modCz) + midPoint[2]);
+ }
+
+ real_t fill;
+
+ if (isPartOfMaskSet(flagFieldIt.neighbor(modCx, modCy, modCz), validNeighborFlagMask))
+ {
+ // compute normal with formula from regular Parker-Youngs approximation
+ if constexpr (Stencil_T::D == uint_t(2))
+ {
+ fill = fillFieldIt.neighbor(modCx, modCy, modCz) *
+ real_c(stencil::gaussianMultipliers[stencil::D3Q27::idx[stencil::map2Dto3D[2][*dir]]]);
+ }
+ else { fill = fillFieldIt.neighbor(modCx, modCy, modCz) * real_c(stencil::gaussianMultipliers[dir.toIdx()]); }
+
+ normal[0] += real_c(dir.cx()) * fill;
+ normal[1] += real_c(dir.cy()) * fill;
+ normal[2] += real_c(dir.cz()) * fill;
+ }
+ else { normal = Vector3< real_t >(real_c(0)); }
+ }
+}
+} // namespace normal_computation
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/surface_geometry/ObstacleFillLevelSweep.h b/src/lbm/free_surface/surface_geometry/ObstacleFillLevelSweep.h
new file mode 100644
index 0000000000000000000000000000000000000000..c5bd8c858c0699580818d3388fea8291adf86f78
--- /dev/null
+++ b/src/lbm/free_surface/surface_geometry/ObstacleFillLevelSweep.h
@@ -0,0 +1,91 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file ObstacleFillLevelSweep.h
+//! \ingroup surface_geometry
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Reflect fill levels into obstacle cells (for finite difference curvature computation).
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "blockforest/StructuredBlockForest.h"
+
+#include "domain_decomposition/BlockDataID.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Reflect fill levels into obstacle cells by averaging the fill levels from fluid cells with weights according to the
+ * surface normal.
+ *
+ * See dissertation of S. Bogner, 2017 (section 4.4.2.1).
+ *
+ * IMPORTANT REMARK: If an obstacle is located in a non-periodic outermost ghost layer, the fill level field must have
+ * two ghost layers. That is, the ObstacleFillLevelSweep computes the fill level obstacle of cells located in the
+ * outermost global ghost layer. For this, the all neighboring cells' fill levels are required.
+ * A single ghost layer is not sufficient, because the computed values by ObstacleFillLevelSweep (located in an
+ * outermost global ghost layer) are not communicated themselves. In the example below, the values A, D, E, and H are
+ * located in a global outermost ghost layer. Only directions without # shall be communicated and * marks ghost layers
+ * in the directions to be communicated. In this example, only B, C, F, and G will be communicated as expected. In
+ * contrast, A, D, E, and H will not be communicated.
+ *
+ * Block 1 Block 2 Block 1 Block 2
+ * ###### ###### ###### ######
+ * # A |* *| E # # A |* *| E #
+ * # ---- -----# # ---- -----#
+ * # B |* *| F # ===> communication # B |F B| F #
+ * # C |* *| G # # C |G C| G #
+ * # ---- -----# # ---- -----#
+ * # D |* *| H # # D |* *| H #
+ * ###### ###### ###### ######
+ **********************************************************************************************************************/
+template< typename Stencil_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+class ObstacleFillLevelSweep
+{
+ protected:
+ using FlagUIDSet = Set< FlagUID >;
+
+ using vector_t = typename std::remove_const< typename VectorField_T::value_type >::type;
+ using flag_t = typename std::remove_const< typename FlagField_T::value_type >::type;
+
+ public:
+ ObstacleFillLevelSweep(const BlockDataID& fillFieldDstID, const ConstBlockDataID& fillFieldSrcID,
+ const ConstBlockDataID& flagFieldID, const ConstBlockDataID& obstacleNormalFieldID,
+ const FlagUIDSet& liquidInterfaceGasFlagIDSet, const FlagUIDSet& obstacleFlagIDSet)
+ : fillFieldDstID_(fillFieldDstID), fillFieldSrcID_(fillFieldSrcID), flagFieldID_(flagFieldID),
+ obstacleNormalFieldID_(obstacleNormalFieldID), liquidInterfaceGasFlagIDSet_(liquidInterfaceGasFlagIDSet),
+ obstacleFlagIDSet_(obstacleFlagIDSet)
+ {}
+
+ void operator()(IBlock* const block);
+
+ private:
+ BlockDataID fillFieldDstID_;
+ ConstBlockDataID fillFieldSrcID_;
+ ConstBlockDataID flagFieldID_;
+ ConstBlockDataID obstacleNormalFieldID_;
+
+ FlagUIDSet liquidInterfaceGasFlagIDSet_;
+ FlagUIDSet obstacleFlagIDSet_;
+}; // class ObstacleFillLevelSweep
+
+} // namespace free_surface
+} // namespace walberla
+
+#include "ObstacleFillLevelSweep.impl.h"
\ No newline at end of file
diff --git a/src/lbm/free_surface/surface_geometry/ObstacleFillLevelSweep.impl.h b/src/lbm/free_surface/surface_geometry/ObstacleFillLevelSweep.impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..7d4182022d5fdb135f6c74619938a19a347be828
--- /dev/null
+++ b/src/lbm/free_surface/surface_geometry/ObstacleFillLevelSweep.impl.h
@@ -0,0 +1,88 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file ObstacleFillLevelSweep.h
+//! \ingroup surface_geometry
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Reflect fill levels into obstacle cells (for finite difference curvature computation).
+//
+//======================================================================================================================
+
+#include "core/debug/CheckFunctions.h"
+#include "core/math/Utility.h"
+#include "core/math/Vector3.h"
+
+#include "field/FlagField.h"
+
+#include <algorithm>
+#include <cmath>
+
+namespace walberla
+{
+namespace free_surface
+{
+template< typename Stencil_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+void ObstacleFillLevelSweep< Stencil_T, FlagField_T, ScalarField_T, VectorField_T >::operator()(IBlock* const block)
+{
+ // get fields
+ const ScalarField_T* const fillFieldSrc = block->getData< const ScalarField_T >(fillFieldSrcID_);
+ ScalarField_T* const fillFieldDst = block->getData< ScalarField_T >(fillFieldDstID_);
+ const FlagField_T* const flagField = block->getData< const FlagField_T >(flagFieldID_);
+ const VectorField_T* const obstacleNormalField = block->getData< const VectorField_T >(obstacleNormalFieldID_);
+
+ // get flags
+ const flag_t liquidInterfaceGasFlagMask = flagField->getMask(liquidInterfaceGasFlagIDSet_);
+ const flag_t obstacleFlagMask = flagField->getMask(obstacleFlagIDSet_);
+
+ // equation (4.22) in dissertation of S. Bogner, 2017 (section 4.4.2.1); include ghost layer because solid cells
+ // might be located in the (outermost global) ghost layer
+ WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ(fillFieldDst, uint_c(1), {
+ // IMPORTANT REMARK: do not restrict this algorithm to obstacle cells that are direct neighbors of interface
+ // cells; the succeeding SmoothingSweep uses the values computed here and must be executed for an at least
+ // two-cell neighborhood of interface cells
+ const typename FlagField_T::ConstPtr flagFieldPtr(*flagField, x, y, z);
+ const typename ScalarField_T::ConstPtr fillFieldSrcPtr(*fillFieldSrc, x, y, z);
+ const typename ScalarField_T::Ptr fillFieldDstPtr(*fillFieldDst, x, y, z);
+
+ if (isPartOfMaskSet(flagFieldPtr, obstacleFlagMask) &&
+ isFlagInNeighborhood< Stencil_T >(flagFieldPtr, liquidInterfaceGasFlagMask))
+ {
+ WALBERLA_CHECK_GREATER(obstacleNormalField->get(x, y, z).length(), real_c(0),
+ "An obstacleNormal of an obstacle cell was found to be zero in obstacleNormalSweep. "
+ "This is not plausible.");
+
+ real_t sum = real_c(0);
+ real_t weightSum = real_c(0);
+ for (auto dir = Stencil_T::beginNoCenter(); dir != Stencil_T::end(); ++dir)
+ {
+ if (isPartOfMaskSet(flagFieldPtr.neighbor(*dir), liquidInterfaceGasFlagMask))
+ {
+ const Vector3< real_t > dirVector =
+ Vector3< real_t >(real_c(dir.cx()), real_c(dir.cy()), real_c(dir.cz())).getNormalized();
+
+ const real_t weight = std::abs(obstacleNormalField->get(x, y, z) * dirVector);
+
+ sum += weight * fillFieldSrcPtr.neighbor(*dir);
+
+ weightSum += weight;
+ }
+ }
+
+ *fillFieldDstPtr = weightSum > real_c(0) ? sum / weightSum : real_c(0);
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ
+}
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/surface_geometry/ObstacleNormalSweep.h b/src/lbm/free_surface/surface_geometry/ObstacleNormalSweep.h
new file mode 100644
index 0000000000000000000000000000000000000000..cb1c6b01dc1cec8f14a51e6a247074c1de5d450b
--- /dev/null
+++ b/src/lbm/free_surface/surface_geometry/ObstacleNormalSweep.h
@@ -0,0 +1,98 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file ObstacleNormalSweep.h
+//! \ingroup surface_geometry
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Compute a mean obstacle normal in interface cells near solid boundary cells.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/logging/Logging.h"
+
+#include "domain_decomposition/BlockDataID.h"
+
+#include "field/FlagField.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Compute a mean obstacle normal in interface cells near obstacle cells, and/or in obstacle cells. This reduces the
+ * influence of a stair-case approximated wall in the wetting model.
+ *
+ * - computeInInterfaceCells: Compute the obstacle normal in interface cells. Required when using curvature computation
+ * based on local triangulation (not with finite difference method).
+ * - computeInObstacleCells: Compute the obstacle normal in obstacle cells. Required when using curvature computation
+ * based on the finite difference method (not with local triangulation).
+ *
+ * Details can be found in the dissertation of S. Donath, 2011 section 6.3.5.2.
+ **********************************************************************************************************************/
+template< typename Stencil_T, typename FlagField_T, typename VectorField_T >
+class ObstacleNormalSweep
+{
+ protected:
+ using vector_t = typename std::remove_const< typename VectorField_T::value_type >::type;
+ using flag_t = typename std::remove_const< typename FlagField_T::value_type >::type;
+
+ public:
+ ObstacleNormalSweep(const BlockDataID& obstacleNormalFieldID, const ConstBlockDataID& flagFieldID,
+ const FlagUID& interfaceFlagID, const Set< FlagUID >& liquidInterfaceGasFlagIDSet,
+ const Set< FlagUID >& obstacleFlagIDSet, bool computeInInterfaceCells,
+ bool computeInObstacleCells, bool computeInGhostLayer)
+ : obstacleNormalFieldID_(obstacleNormalFieldID), flagFieldID_(flagFieldID), interfaceFlagID_(interfaceFlagID),
+ liquidInterfaceGasFlagIDSet_(liquidInterfaceGasFlagIDSet), obstacleFlagIDSet_(obstacleFlagIDSet),
+ computeInInterfaceCells_(computeInInterfaceCells), computeInObstacleCells_(computeInObstacleCells),
+ computeInGhostLayer_(computeInGhostLayer)
+ {
+ if (!computeInInterfaceCells_ && !computeInObstacleCells_)
+ {
+ WALBERLA_LOG_WARNING_ON_ROOT(
+ "In ObstacleNormalSweep, you specified to neither compute the obstacle normal in interface cells, nor in "
+ "obstacle cells. That is, ObstacleNormalSweep will do nothing. Please check if this is what you really "
+ "want.");
+ }
+ }
+
+ void operator()(IBlock* const block);
+
+ private:
+ template< typename FlagFieldIt_T >
+ void computeObstacleNormalInInterfaceCell(vector_t& obstacleNormal, const FlagFieldIt_T& flagFieldIt,
+ const flag_t& validNeighborFlagMask);
+
+ template< typename FlagFieldIt_T >
+ void computeObstacleNormalInObstacleCell(vector_t& obstacleNormal, const FlagFieldIt_T& flagFieldIt,
+ const flag_t& liquidInterfaceGasFlagMask);
+
+ BlockDataID obstacleNormalFieldID_;
+ ConstBlockDataID flagFieldID_;
+
+ FlagUID interfaceFlagID_;
+ Set< FlagUID > liquidInterfaceGasFlagIDSet_;
+ Set< FlagUID > obstacleFlagIDSet_;
+
+ bool computeInInterfaceCells_;
+ bool computeInObstacleCells_;
+ bool computeInGhostLayer_;
+}; // class ObstacleNormalSweep
+
+} // namespace free_surface
+} // namespace walberla
+
+#include "ObstacleNormalSweep.impl.h"
\ No newline at end of file
diff --git a/src/lbm/free_surface/surface_geometry/ObstacleNormalSweep.impl.h b/src/lbm/free_surface/surface_geometry/ObstacleNormalSweep.impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..6d3b722580e0dd573834754581d8b176c827374c
--- /dev/null
+++ b/src/lbm/free_surface/surface_geometry/ObstacleNormalSweep.impl.h
@@ -0,0 +1,147 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file ObstacleNormalSweep.impl.h
+//! \ingroup surface_geometry
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Compute a mean obstacle normal in interface cells near solid boundary cells.
+//
+//======================================================================================================================
+
+#include "core/math/Vector3.h"
+
+#include "field/iterators/IteratorMacros.h"
+
+#include "stencil/D3Q27.h"
+
+#include "ObstacleNormalSweep.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+template< typename Stencil_T, typename FlagField_T, typename VectorField_T >
+void ObstacleNormalSweep< Stencil_T, FlagField_T, VectorField_T >::operator()(IBlock* const block)
+{
+ // do nothing if obstacle normal must not be computed anywhere
+ if (!computeInInterfaceCells_ && !computeInObstacleCells_) { return; }
+
+ // fetch fields
+ VectorField_T* const obstacleNormalField = block->getData< VectorField_T >(obstacleNormalFieldID_);
+ const FlagField_T* const flagField = block->getData< const FlagField_T >(flagFieldID_);
+
+ // two ghost layers are required in the flag field
+ WALBERLA_ASSERT_EQUAL(flagField->nrOfGhostLayers(), uint_c(2));
+
+ // get flags
+ const flag_t interfaceFlag = flagField->getFlag(interfaceFlagID_);
+ const flag_t liquidInterfaceGasFlagMask = flagField->getMask(liquidInterfaceGasFlagIDSet_);
+ const flag_t obstacleFlagMask = flagField->getMask(obstacleFlagIDSet_);
+
+ // include ghost layer because solid cells might be located in the (outermost global) ghost layer
+ WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ(obstacleNormalField, uint_c(1), {
+ if (!computeInGhostLayer_ && (!flagField->isInInnerPart(Cell(x, y, z)))) { continue; }
+
+ const typename FlagField_T::ConstPtr flagFieldPtr(*flagField, x, y, z);
+
+ const bool computeInInterfaceCell = computeInInterfaceCells_ && isPartOfMaskSet(flagFieldPtr, interfaceFlag) &&
+ isFlagInNeighborhood< Stencil_T >(flagFieldPtr, obstacleFlagMask);
+
+ const bool computeInObstacleCell = computeInObstacleCells_ && isPartOfMaskSet(flagFieldPtr, obstacleFlagMask) &&
+ isFlagInNeighborhood< Stencil_T >(flagFieldPtr, liquidInterfaceGasFlagMask);
+
+ // IMPORTANT REMARK: do not restrict this algorithm to obstacle cells that are direct neighbors of interface
+ // cells; the succeeding ObstacleFillLevelSweep and SmoothingSweep use the values computed here and the latter
+ // must work on an at least two-cell neighborhood of interface cells
+
+ vector_t& obstacleNormal = obstacleNormalField->get(x, y, z);
+
+ if (computeInInterfaceCell)
+ {
+ WALBERLA_ASSERT(!computeInObstacleCell);
+
+ // compute mean obstacle, i.e., mean wall normal in interface cell (see dissertation of S. Donath, 2011,
+ // section 6.3.5.2)
+ computeObstacleNormalInInterfaceCell(obstacleNormal, flagFieldPtr, obstacleFlagMask);
+ }
+ else
+ {
+ if (computeInObstacleCell)
+ {
+ WALBERLA_ASSERT(!computeInInterfaceCell);
+
+ // compute mean obstacle normal in obstacle cell
+ computeObstacleNormalInObstacleCell(obstacleNormal, flagFieldPtr, liquidInterfaceGasFlagMask);
+ }
+ else
+ {
+ // set obstacle normal of all other cells to zero
+ obstacleNormal.set(real_c(0), real_c(0), real_c(0));
+ }
+ }
+
+ // normalize mean obstacle normal
+ const real_t sqrObstNormal = obstacleNormal.sqrLength();
+ if (sqrObstNormal > real_c(0))
+ {
+ const real_t invlength = -real_c(1) / real_c(std::sqrt(sqrObstNormal));
+ obstacleNormal *= invlength;
+ }
+ }); // WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ
+}
+
+template< typename Stencil_T, typename FlagField_T, typename VectorField_T >
+template< typename FlagFieldIt_T >
+void ObstacleNormalSweep< Stencil_T, FlagField_T, VectorField_T >::computeObstacleNormalInInterfaceCell(
+ vector_t& obstacleNormal, const FlagFieldIt_T& flagFieldIt, const flag_t& obstacleFlagMask)
+{
+ uint_t obstCount = uint_c(0);
+ obstacleNormal = vector_t(real_c(0));
+
+ for (auto i = Stencil_T::beginNoCenter(); i != Stencil_T::end(); ++i)
+ {
+ // only consider directions in which there is an obstacle cell
+ if (isPartOfMaskSet(flagFieldIt.neighbor(*i), obstacleFlagMask))
+ {
+ obstacleNormal += vector_t(real_c(-i.cx()), real_c(-i.cy()), real_c(-i.cz()));
+ ++obstCount;
+ }
+ }
+ obstacleNormal = obstCount > uint_c(0) ? obstacleNormal / real_c(obstCount) : vector_t(real_c(0));
+}
+
+template< typename Stencil_T, typename FlagField_T, typename VectorField_T >
+template< typename FlagFieldIt_T >
+void ObstacleNormalSweep< Stencil_T, FlagField_T, VectorField_T >::computeObstacleNormalInObstacleCell(
+ vector_t& obstacleNormal, const FlagFieldIt_T& flagFieldIt, const flag_t& liquidInterfaceGasFlagMask)
+{
+ uint_t obstCount = uint_c(0);
+ obstacleNormal = vector_t(real_c(0));
+
+ for (auto i = Stencil_T::beginNoCenter(); i != Stencil_T::end(); ++i)
+ {
+ // only consider directions in which there is a liquid, interface, or gas cell
+ if (isPartOfMaskSet(flagFieldIt.neighbor(*i), liquidInterfaceGasFlagMask))
+ {
+ obstacleNormal += vector_t(real_c(i.cx()), real_c(i.cy()), real_c(i.cz()));
+
+ ++obstCount;
+ }
+ }
+ obstacleNormal = obstCount > uint_c(0) ? obstacleNormal / real_c(obstCount) : vector_t(real_c(0));
+}
+
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/surface_geometry/SmoothingSweep.h b/src/lbm/free_surface/surface_geometry/SmoothingSweep.h
new file mode 100644
index 0000000000000000000000000000000000000000..9b76ffd20336cac435d7b2cb96d76fbcee5cb090
--- /dev/null
+++ b/src/lbm/free_surface/surface_geometry/SmoothingSweep.h
@@ -0,0 +1,113 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file SmoothingSweep.h
+//! \ingroup surface_geometry
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Smooth fill levels (used for finite difference curvature computation).
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "blockforest/StructuredBlockForest.h"
+
+#include "domain_decomposition/BlockDataID.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+// forward declaration
+template< typename Stencil_T >
+class KernelK8;
+
+/***********************************************************************************************************************
+ * Smooth fill levels such that interface-neighboring cells get assigned a new fill level. This is required for
+ * computing the interface curvature using the finite difference method.
+ *
+ * The same smoothing kernel is used as in the dissertation of S. Bogner, 2017, i.e., the K8 kernel with support
+ * radius 2 from
+ * Williams, Kothe and Puckett, "Accuracy and Convergence of Continuum Surface Tension Models", 1998.
+ **********************************************************************************************************************/
+template< typename Stencil_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+class SmoothingSweep
+{
+ protected:
+ using vector_t = typename std::remove_const< typename VectorField_T::value_type >::type;
+ using flag_t = typename std::remove_const< typename FlagField_T::value_type >::type;
+
+ public:
+ SmoothingSweep(const BlockDataID& smoothFillFieldID, const ConstBlockDataID& fillFieldID,
+ const ConstBlockDataID& flagFieldID, const Set< FlagUID >& liquidInterfaceGasFlagIDSet,
+ const Set< FlagUID >& obstacleFlagIDSet, bool includeObstacleNeighbors)
+ : smoothFillFieldID_(smoothFillFieldID), fillFieldID_(fillFieldID), flagFieldID_(flagFieldID),
+ liquidInterfaceGasFlagIDSet_(liquidInterfaceGasFlagIDSet), obstacleFlagIDSet_(obstacleFlagIDSet),
+ includeObstacleNeighbors_(includeObstacleNeighbors), smoothingKernel_(KernelK8< Stencil_T >(real_c(2.0)))
+ {}
+
+ void operator()(IBlock* const block);
+
+ private:
+ BlockDataID smoothFillFieldID_;
+ ConstBlockDataID fillFieldID_;
+ ConstBlockDataID flagFieldID_;
+
+ Set< FlagUID > liquidInterfaceGasFlagIDSet_;
+ Set< FlagUID > obstacleFlagIDSet_;
+
+ bool includeObstacleNeighbors_;
+
+ KernelK8< Stencil_T > smoothingKernel_;
+}; // class SmoothingSweep
+
+/***********************************************************************************************************************
+ * K8 kernel from Williams, Kothe and Puckett, "Accuracy and Convergence of Continuum Surface Tension Models", 1998.
+ **********************************************************************************************************************/
+template< typename Stencil_T >
+class KernelK8
+{
+ public:
+ KernelK8(real_t epsilon) : epsilon_(epsilon) { stencilSize_ = uint_c(std::ceil(epsilon_) - real_c(1)); }
+
+ // equation (11) in Williams et al. (normalization constant A=1 here, result must be normalized outside the kernel)
+ inline real_t kernelFunction(const Vector3< real_t >& dirVec) const
+ {
+ const real_t r_sqr = dirVec.sqrLength();
+ const real_t eps_sqr = epsilon_ * epsilon_;
+
+ if (r_sqr < eps_sqr)
+ {
+ real_t result = real_c(1.0) - (r_sqr / (eps_sqr));
+ result = result * result * result * result;
+
+ return result;
+ }
+ else { return real_c(0.0); }
+ }
+
+ inline real_t getSupportRadius() const { return epsilon_; }
+ inline uint_t getStencilSize() const { return static_cast< uint_t >(stencilSize_); }
+
+ private:
+ real_t epsilon_; // support radius of the kernel
+ uint_t stencilSize_; // size of the stencil which defines included neighbors in smoothing
+
+}; // class KernelK8
+
+} // namespace free_surface
+} // namespace walberla
+
+#include "SmoothingSweep.impl.h"
\ No newline at end of file
diff --git a/src/lbm/free_surface/surface_geometry/SmoothingSweep.impl.h b/src/lbm/free_surface/surface_geometry/SmoothingSweep.impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..3b61d23d248562c5c27a7d5aab330142de8944b8
--- /dev/null
+++ b/src/lbm/free_surface/surface_geometry/SmoothingSweep.impl.h
@@ -0,0 +1,159 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file SmoothingSweep.impl.h
+//! \ingroup surface_geometry
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Smooth fill levels (used for finite difference curvature computation).
+//
+//======================================================================================================================
+
+#include "core/debug/CheckFunctions.h"
+#include "core/math/Utility.h"
+#include "core/math/Vector3.h"
+
+#include "field/FlagField.h"
+
+#include <algorithm>
+#include <cmath>
+
+#include "ContactAngle.h"
+#include "SmoothingSweep.h"
+#include "Utility.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+template< typename Stencil_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+void SmoothingSweep< Stencil_T, FlagField_T, ScalarField_T, VectorField_T >::operator()(IBlock* const block)
+{
+ // get fields
+ ScalarField_T* const smoothFillField = block->getData< ScalarField_T >(smoothFillFieldID_);
+ const ScalarField_T* const fillField = block->getData< const ScalarField_T >(fillFieldID_);
+ const FlagField_T* const flagField = block->getData< const FlagField_T >(flagFieldID_);
+
+ // get flags
+ const flag_t liquidInterfaceGasFlagMask = flagField->getMask(liquidInterfaceGasFlagIDSet_);
+ const flag_t obstacleFlagMask = flagField->getMask(obstacleFlagIDSet_);
+
+ // const KernelK8< Stencil_T > smoothingKernel(real_c(2.0));
+
+ const uint_t kernelSize = smoothingKernel_.getStencilSize();
+
+ WALBERLA_CHECK_GREATER_EQUAL(
+ smoothFillField->nrOfGhostLayers(), kernelSize,
+ "Support radius of smoothing kernel results in a smoothing stencil size that exceeds the ghost layers.");
+
+ // including ghost layers is not necessary, even if solid cells are located in the (outermost global) ghost layer,
+ // because fill level in obstacle cells is set by ObstacleFillLevelSweep
+ WALBERLA_FOR_ALL_CELLS(smoothFillFieldIt, smoothFillField, fillFieldIt, fillField, flagFieldIt, flagField, {
+ // IMPORTANT REMARK: do not restrict this algorithm to interface cells and their neighbors; when the normals are
+ // computed in the neighborhood of interface cells, the second neighbors of interface cells are also required
+
+ // mollify fill level in interface, liquid, and gas according to equation (9) in Williams et al.
+ if (isPartOfMaskSet(flagFieldIt, liquidInterfaceGasFlagMask))
+ {
+ real_t normalizationConstant = real_c(0);
+ real_t smoothedFillLevel = real_c(0);
+ if constexpr (Stencil_T::D == uint_t(2))
+ {
+ for (int j = -int_c(kernelSize); j <= int_c(kernelSize); ++j)
+ {
+ for (int i = -int_c(kernelSize); i <= int_c(kernelSize); ++i)
+ {
+ const Vector3< real_t > dirVector(real_c(i), real_c(j), real_c(0));
+
+ if (isPartOfMaskSet(flagFieldIt.neighbor(cell_idx_c(i), cell_idx_c(j), cell_idx_c(0)),
+ obstacleFlagMask))
+ {
+ if (includeObstacleNeighbors_)
+ {
+ // in solid cells, use values from smoothed fill field (instead of regular fill field) that have
+ // been set by ObstacleFillLevelSweep
+ smoothedFillLevel += smoothingKernel_.kernelFunction(dirVector) *
+ smoothFillFieldIt.neighbor(cell_idx_c(i), cell_idx_c(j), cell_idx_c(0));
+
+ if (dirVector.length() < smoothingKernel_.getSupportRadius())
+ {
+ normalizationConstant += smoothingKernel_.kernelFunction(dirVector);
+ }
+ } // else: do not include this direction in smoothing
+ }
+ else
+ {
+ smoothedFillLevel += smoothingKernel_.kernelFunction(dirVector) *
+ fillFieldIt.neighbor(cell_idx_c(i), cell_idx_c(j), cell_idx_c(0));
+
+ if (dirVector.length() < smoothingKernel_.getSupportRadius())
+ {
+ normalizationConstant += smoothingKernel_.kernelFunction(dirVector);
+ }
+ }
+ }
+ }
+ }
+ else
+ {
+ if constexpr (Stencil_T::D == uint_t(3))
+ {
+ for (int k = -int_c(kernelSize); k <= int_c(kernelSize); ++k)
+ {
+ for (int j = -int_c(kernelSize); j <= int_c(kernelSize); ++j)
+ {
+ for (int i = -int_c(kernelSize); i <= int_c(kernelSize); ++i)
+ {
+ const Vector3< real_t > dirVector(real_c(i), real_c(j), real_c(k));
+
+ if (isPartOfMaskSet(flagFieldIt.neighbor(cell_idx_c(i), cell_idx_c(j), cell_idx_c(k)),
+ obstacleFlagMask))
+ {
+ if (includeObstacleNeighbors_)
+ {
+ // in solid cells, use values from smoothed fill field (instead of regular fill field)
+ // that have been set by ObstacleFillLevelSweep
+ smoothedFillLevel +=
+ smoothingKernel_.kernelFunction(dirVector) *
+ smoothFillFieldIt.neighbor(cell_idx_c(i), cell_idx_c(j), cell_idx_c(k));
+
+ if (dirVector.length() < smoothingKernel_.getSupportRadius())
+ {
+ normalizationConstant += smoothingKernel_.kernelFunction(dirVector);
+ }
+ } // else: do not include this direction in smoothing
+ }
+ else
+ {
+ smoothedFillLevel += smoothingKernel_.kernelFunction(dirVector) *
+ fillFieldIt.neighbor(cell_idx_c(i), cell_idx_c(j), cell_idx_c(k));
+
+ if (dirVector.length() < smoothingKernel_.getSupportRadius())
+ {
+ normalizationConstant += smoothingKernel_.kernelFunction(dirVector);
+ }
+ }
+ }
+ }
+ }
+ }
+ }
+
+ smoothedFillLevel /= normalizationConstant;
+ *smoothFillFieldIt = smoothedFillLevel;
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+}
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/surface_geometry/SurfaceGeometryHandler.h b/src/lbm/free_surface/surface_geometry/SurfaceGeometryHandler.h
new file mode 100644
index 0000000000000000000000000000000000000000..f0f21c2e6b162c19bba9756a33e6b5ed838eb681
--- /dev/null
+++ b/src/lbm/free_surface/surface_geometry/SurfaceGeometryHandler.h
@@ -0,0 +1,168 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file SurfaceGeometryHandler.h
+//! \ingroup surface_geometry
+//! \author Matthias Markl <matthias.markl@fau.de>
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Handles the surface geometry (normal and curvature computation) by creating fields and adding sweeps.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/StringUtility.h"
+
+#include "domain_decomposition/StructuredBlockStorage.h"
+
+#include "field/AddToStorage.h"
+#include "field/FlagField.h"
+
+#include "lbm/blockforest/communication/SimpleCommunication.h"
+#include "lbm/free_surface/BlockStateDetectorSweep.h"
+#include "lbm/free_surface/FlagInfo.h"
+
+#include "stencil/D2Q9.h"
+#include "stencil/D3Q27.h"
+
+#include "timeloop/SweepTimeloop.h"
+
+#include <type_traits>
+#include <vector>
+
+#include "CurvatureModel.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Handles the surface geometry (normal and curvature computation) by creating fields and adding sweeps.
+ **********************************************************************************************************************/
+template< typename LatticeModel_T, typename FlagField_T, typename ScalarField_T, typename VectorField_T >
+class SurfaceGeometryHandler
+{
+ protected:
+ using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+ using vector_t = typename std::remove_const< typename VectorField_T::value_type >::type;
+
+ // explicitly use either D2Q9 or D3Q27 here, as the geometry operations require (or are most accurate with) the full
+ // neighborhood;
+ using Stencil_T =
+ typename std::conditional< LatticeModel_T::Stencil::D == uint_t(2), stencil::D2Q9, stencil::D3Q27 >::type;
+ using Communication_T = blockforest::SimpleCommunication< Stencil_T >;
+ using StateSweep = BlockStateDetectorSweep< FlagField_T >; // used in friend classes
+
+ public:
+ SurfaceGeometryHandler(const std::shared_ptr< StructuredBlockForest >& blockForest,
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T >& freeSurfaceBoundaryHandling,
+ const BlockDataID& fillFieldID, const std::string& curvatureModel, bool computeCurvature,
+ bool enableWetting, real_t contactAngleInDegrees)
+ : blockForest_(blockForest), freeSurfaceBoundaryHandling_(freeSurfaceBoundaryHandling), fillFieldID_(fillFieldID),
+ curvatureModel_(curvatureModel), computeCurvature_(computeCurvature), enableWetting_(enableWetting),
+ contactAngle_(ContactAngle(contactAngleInDegrees))
+ {
+ curvatureFieldID_ =
+ field::addToStorage< ScalarField_T >(blockForest_, "Curvature field", real_c(0), field::fzyx, uint_c(1));
+ normalFieldID_ = field::addToStorage< VectorField_T >(blockForest_, "Normal field", vector_t(real_c(0)),
+ field::fzyx, uint_c(1));
+ obstacleNormalFieldID_ = field::addToStorage< VectorField_T >(blockForest_, "Obstacle normal field",
+ vector_t(real_c(0)), field::fzyx, uint_c(1));
+
+ flagFieldID_ = freeSurfaceBoundaryHandling_->getFlagFieldID();
+
+ obstacleFlagIDSet_ = freeSurfaceBoundaryHandling_->getFlagInfo().getObstacleIDSet();
+
+ if (LatticeModel_T::Stencil::D == uint_t(2))
+ {
+ WALBERLA_LOG_INFO_ON_ROOT(
+ "IMPORTANT REMARK: You are using a D2Q9 stencil in SurfaceGeometryHandler. Be aware that the "
+ "results might slightly differ when compared to a D3Q19 stencil and periodicity in the third direction. "
+ "This is caused by the smoothing of the fill level field, where the additional directions in the D3Q27 add "
+ "additional weights to the smoothing kernel. Therefore, the resulting smoothed fill level will be "
+ "different.")
+ }
+ }
+
+ ConstBlockDataID getConstCurvatureFieldID() const { return curvatureFieldID_; }
+ ConstBlockDataID getConstNormalFieldID() const { return normalFieldID_; }
+ ConstBlockDataID getConstObstNormalFieldID() const { return obstacleNormalFieldID_; }
+
+ BlockDataID getCurvatureFieldID() const { return curvatureFieldID_; }
+ BlockDataID getNormalFieldID() const { return normalFieldID_; }
+ BlockDataID getObstNormalFieldID() const { return obstacleNormalFieldID_; }
+
+ void addSweeps(SweepTimeloop& timeloop) const
+ {
+ auto blockStateUpdate = StateSweep(blockForest_, freeSurfaceBoundaryHandling_->getFlagInfo(), flagFieldID_);
+
+ if (!string_icompare(curvatureModel_, "FiniteDifferenceMethod"))
+ {
+ curvature_model::FiniteDifferenceMethod< Stencil_T, LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >
+ model;
+ model.addSweeps(timeloop, *this);
+ }
+ else
+ {
+ if (!string_icompare(curvatureModel_, "LocalTriangulation"))
+ {
+ curvature_model::LocalTriangulation< Stencil_T, LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >
+ model;
+ model.addSweeps(timeloop, *this);
+ }
+ else
+ {
+ if (!string_icompare(curvatureModel_, "SimpleFiniteDifferenceMethod"))
+ {
+ curvature_model::SimpleFiniteDifferenceMethod< Stencil_T, LatticeModel_T, FlagField_T, ScalarField_T,
+ VectorField_T >
+ model;
+ model.addSweeps(timeloop, *this);
+ }
+ else { WALBERLA_ABORT("The specified curvature model is unknown.") }
+ }
+ }
+ }
+
+ protected:
+ std::shared_ptr< StructuredBlockForest > blockForest_; // used by friend classes
+
+ std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling_;
+
+ BlockDataID flagFieldID_;
+ ConstBlockDataID fillFieldID_;
+
+ BlockDataID curvatureFieldID_;
+ BlockDataID normalFieldID_;
+ BlockDataID obstacleNormalFieldID_; // mean normal in obstacle cells required for e.g. artificial curvature contact
+ // model (dissertation of S. Donath, 2011, section 6.5.3.2)
+
+ Set< FlagUID > obstacleFlagIDSet_; // used by friend classes (see CurvatureModel.impl.h)
+
+ std::string curvatureModel_;
+ bool computeCurvature_; // allows to not compute curvature (just normal) when e.g. the surface tension is 0
+ bool enableWetting_; // used by friend classes
+ ContactAngle contactAngle_; // used by friend classes
+
+ friend class curvature_model::FiniteDifferenceMethod< Stencil_T, LatticeModel_T, FlagField_T, ScalarField_T,
+ VectorField_T >;
+ friend class curvature_model::LocalTriangulation< Stencil_T, LatticeModel_T, FlagField_T, ScalarField_T,
+ VectorField_T >;
+ friend class curvature_model::SimpleFiniteDifferenceMethod< Stencil_T, LatticeModel_T, FlagField_T, ScalarField_T,
+ VectorField_T >;
+}; // class SurfaceGeometryHandler
+
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/surface_geometry/Utility.cpp b/src/lbm/free_surface/surface_geometry/Utility.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..9b1582c665e3173207918a27154afaedeb500dd9
--- /dev/null
+++ b/src/lbm/free_surface/surface_geometry/Utility.cpp
@@ -0,0 +1,547 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file Utility.cpp
+//! \ingroup surface_geometry
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Helper functions for surface geometry computations.
+//
+//======================================================================================================================
+
+#include "Utility.h"
+
+#include "core/math/Constants.h"
+#include "core/math/Matrix3.h"
+#include "core/math/Vector3.h"
+
+#include <cmath>
+#include <vector>
+
+#include "ContactAngle.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+bool computeArtificalWallPoint(const Vector3< real_t >& globalInterfacePointLocation,
+ const Vector3< real_t >& globalCellCoordinate, const Vector3< real_t >& normal,
+ const Vector3< real_t >& wallNormal, const Vector3< real_t >& obstacleNormal,
+ const ContactAngle& contactAngle, Vector3< real_t >& artificialWallPointCoord,
+ Vector3< real_t >& artificialWallNormal)
+{
+ // get local interface point location (location of interface point inside cell with origin (0.5,0.5,0.5))
+ const Vector3< real_t > interfacePointLocation = globalInterfacePointLocation - globalCellCoordinate;
+
+ // check whether the interface plane intersects one of the cell's edges; exit this function if it does not intersect
+ // any edge in at least one direction (see dissertation of S. Donath, 2011, section 6.4.5.4)
+ if (wallNormal[0] < real_c(0) &&
+ (getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(0), real_c(0)),
+ Vector3< real_t >(real_c(0), real_c(1), real_c(0)), normal,
+ interfacePointLocation) < real_c(0)) &&
+
+ (getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(0), real_c(0)),
+ Vector3< real_t >(real_c(0), real_c(0), real_c(1)), normal,
+ interfacePointLocation) < real_c(0)) &&
+
+ (getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(1), real_c(0)),
+ Vector3< real_t >(real_c(0), real_c(0), real_c(1)), normal,
+ interfacePointLocation) < real_c(0)) &&
+
+ (getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(0), real_c(1)),
+ Vector3< real_t >(real_c(0), real_c(1), real_c(0)), normal,
+ interfacePointLocation) < real_c(0)))
+ {
+ return false;
+ }
+
+ if (wallNormal[0] > real_c(0) &&
+ (getCellEdgeIntersection(Vector3< real_t >(real_c(1), real_c(0), real_c(0)),
+ Vector3< real_t >(real_c(0), real_c(1), real_c(0)), normal,
+ interfacePointLocation) < real_c(0)) &&
+
+ (getCellEdgeIntersection(Vector3< real_t >(real_c(1), real_c(0), real_c(0)),
+ Vector3< real_t >(real_c(0), real_c(0), real_c(1)), normal,
+ interfacePointLocation) < real_c(0)) &&
+
+ (getCellEdgeIntersection(Vector3< real_t >(real_c(1), real_c(1), real_c(0)),
+ Vector3< real_t >(real_c(0), real_c(0), real_c(1)), normal,
+ interfacePointLocation) < real_c(0)) &&
+
+ (getCellEdgeIntersection(Vector3< real_t >(real_c(1), real_c(0), real_c(1)),
+ Vector3< real_t >(real_c(0), real_c(1), real_c(0)), normal,
+ interfacePointLocation) < real_c(0)))
+ {
+ return false;
+ }
+
+ if (wallNormal[1] < real_c(0) &&
+ (getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(0), real_c(0)),
+ Vector3< real_t >(real_c(1), real_c(0), real_c(0)), normal,
+ interfacePointLocation) < real_c(0)) &&
+
+ (getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(0), real_c(0)),
+ Vector3< real_t >(real_c(0), real_c(0), real_c(1)), normal,
+ interfacePointLocation) < real_c(0)) &&
+
+ (getCellEdgeIntersection(Vector3< real_t >(real_c(1), real_c(0), real_c(0)),
+ Vector3< real_t >(real_c(0), real_c(0), real_c(1)), normal,
+ interfacePointLocation) < real_c(0)) &&
+
+ (getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(0), real_c(1)),
+ Vector3< real_t >(real_c(1), real_c(0), real_c(0)), normal,
+ interfacePointLocation) < real_c(0)))
+ {
+ return false;
+ }
+
+ if (wallNormal[1] > real_c(0) &&
+ (getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(1), real_c(0)),
+ Vector3< real_t >(real_c(1), real_c(0), real_c(0)), normal,
+ interfacePointLocation) < real_c(0)) &&
+
+ (getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(1), real_c(0)),
+ Vector3< real_t >(real_c(0), real_c(0), real_c(1)), normal,
+ interfacePointLocation) < real_c(0)) &&
+
+ (getCellEdgeIntersection(Vector3< real_t >(real_c(1), real_c(1), real_c(0)),
+ Vector3< real_t >(real_c(0), real_c(0), real_c(1)), normal,
+ interfacePointLocation) < real_c(0)) &&
+
+ (getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(1), real_c(1)),
+ Vector3< real_t >(real_c(1), real_c(0), real_c(0)), normal,
+ interfacePointLocation) < real_c(0)))
+ {
+ return false;
+ }
+
+ if (wallNormal[2] < real_c(0) &&
+ (getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(0), real_c(0)),
+ Vector3< real_t >(real_c(1), real_c(0), real_c(0)), normal,
+ interfacePointLocation) < real_c(0)) &&
+
+ (getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(0), real_c(0)),
+ Vector3< real_t >(real_c(0), real_c(1), real_c(0)), normal,
+ interfacePointLocation) < real_c(0)) &&
+
+ (getCellEdgeIntersection(Vector3< real_t >(real_c(1), real_c(0), real_c(0)),
+ Vector3< real_t >(real_c(0), real_c(1), real_c(0)), normal,
+ interfacePointLocation) < real_c(0)) &&
+
+ (getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(1), real_c(0)),
+ Vector3< real_t >(real_c(1), real_c(0), real_c(0)), normal,
+ interfacePointLocation) < real_c(0)))
+ {
+ return false;
+ }
+
+ if (wallNormal[2] > real_c(0) &&
+ (getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(0), real_c(1)),
+ Vector3< real_t >(real_c(1), real_c(0), real_c(0)), normal,
+ interfacePointLocation) < real_c(0)) &&
+
+ (getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(0), real_c(1)),
+ Vector3< real_t >(real_c(0), real_c(1), real_c(0)), normal,
+ interfacePointLocation) < real_c(0)) &&
+
+ (getCellEdgeIntersection(Vector3< real_t >(real_c(1), real_c(0), real_c(1)),
+ Vector3< real_t >(real_c(0), real_c(1), real_c(0)), normal,
+ interfacePointLocation) < real_c(0)) &&
+
+ (getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(1), real_c(1)),
+ Vector3< real_t >(real_c(1), real_c(0), real_c(0)), normal,
+ interfacePointLocation) < real_c(0)))
+ {
+ return false;
+ }
+
+ // line 1 in Algorithm 6.2 in dissertation of S. Donath, 2011
+ real_t cosAlpha = dot(normal, obstacleNormal);
+
+ // determine sin(alpha) via orthogonal projections to compute alpha in the correct quadrant
+ const Vector3< real_t > projector = normal - cosAlpha * obstacleNormal;
+ const Vector3< real_t > baseVec = cross(obstacleNormal, normal);
+ const real_t sinAlpha = projector * cross(baseVec, obstacleNormal).getNormalized();
+
+ // compute alpha (angle between surface plane and wall)
+ real_t alpha;
+ if (sinAlpha >= real_c(0)) { alpha = real_c(std::acos(cosAlpha)); }
+ else { alpha = real_c(2) * math::pi - real_c(std::acos(cosAlpha)); }
+
+ // line 2 in Algorithm 6.2 in dissertation of S. Donath, 2011
+ const real_t theta = contactAngle.getInRadians();
+ const real_t delta = theta - alpha;
+
+ // determine distance from interface point to wall plane
+ const real_t wallDistance = dot(fabs(interfacePointLocation), wallNormal);
+
+ // line 3-4 in Algorithm 6.2 in dissertation of S. Donath, 2011
+ // correct contact angle is already reached
+ if (realIsEqual(delta, real_c(0), real_c(1e-14)))
+ {
+ // IMPORTANT: the following approach is in contrast to the dissertation of S. Donath, 2011
+ // - Dissertation: only the intersection of the interface surface with the wall is computed; it is known that this
+ // could in rare cases lead to unstable configurations
+ // - Here: extrapolate (extend) the wall point such that the triangle is considered valid during curvature
+ // computation;
+ // This has been adapted from the old waLBerla source code. While delta is considered to be zero, there is
+ // still a division by delta below. This has not been found problematic when using double precision, however it
+ // leads to invalid values in single precision. Therefore, the following macro exits the function prematurely when
+ // using single precision and returns false such that the wall point will not be used.
+#ifndef WALBERLA_DOUBLE_ACCURACY
+ return false;
+#endif
+
+ // determine the direction in which the artifical wall point is to be expected
+ // expression "dot(wallNormal,normal)*wallNormal" is orthogonal projection of normal on wallNormal
+ // (wallNormal has already been normalized => no division by vector length required)
+ const Vector3< real_t > targetDir = (normal - dot(wallNormal, normal) * wallNormal).getNormalized();
+
+ const real_t sinTheta = contactAngle.getSin();
+
+ // distance of interface point to wall in direction of wallNormal
+ real_t wallPointDistance = wallDistance / sinTheta; // d_WP in dissertation of S. Donath, 2011
+
+ // wall point must not be too close or far away from interface point too avoid degenerated triangles
+ real_t virtWallDistance;
+ if (wallPointDistance < real_c(0.8))
+ {
+ // extend distance with a heuristically chosen tolerance such that the point is not thrown away when checking
+ // for degenerated triangles in the curvature computation
+ wallPointDistance = real_c(0.801);
+ virtWallDistance = wallPointDistance * sinTheta; // d_W'
+ }
+ else
+ {
+ if (wallPointDistance > real_c(1.8))
+ {
+ // reduce distance with heuristically chosen tolerance
+ wallPointDistance = real_c(1.799);
+ virtWallDistance = wallPointDistance * sinTheta; // d_W'
+ }
+ else
+ {
+ virtWallDistance = wallDistance; // d_W'
+ }
+ }
+
+ const real_t virtPointDistance = virtWallDistance / sinTheta; // d_WP'
+
+ // compute point by shifting virtWallDistance along wallNormal starting from globalInterfacePointLocation
+ // virtWallProjection is given in global coordinates
+ const Vector3< real_t > virtWallProjection = globalInterfacePointLocation - virtWallDistance * wallNormal;
+
+ const real_t cosTheta = contactAngle.getCos();
+
+ // compute artificial wall point by starting from virtWallProjection and shifting "virtPointDistance*cosTheta" in
+ // targetDir (vritualWallPointCoord is r_W in dissertation of S. Donath, 2011)
+ artificialWallPointCoord = virtWallProjection + virtPointDistance * cosTheta * targetDir;
+
+ // radius r of the artificial circle "virtPointDistance*0.5/(sin(0.5)*delta)"
+ // midpoint M of the artificial circle "normal*r+globalInterfacePointLocation"
+ // normal of the virtual wall point "M-artificialWallPointCoord"
+ artificialWallNormal = normal * virtPointDistance * real_c(0.5) / (std::sin(real_c(0.5) * delta)) +
+ globalInterfacePointLocation - artificialWallPointCoord;
+ artificialWallNormal = artificialWallNormal.getNormalized();
+
+ return true;
+ }
+ else
+ {
+ // compute base angles of triangle; line 6 in Algorithm 6.2 in dissertation of S. Donath, 2011
+ const real_t beta = real_c(0.5) * (math::pi - real_c(std::fabs(delta)));
+
+ real_t gamma;
+ // line 7 in Algorithm 6.2 in dissertation of S. Donath, 2011
+ if (theta < alpha) { gamma = beta - theta; }
+ else { gamma = beta + theta - math::pi; }
+
+ const real_t wallPointDistance =
+ wallDistance / real_c(std::cos(std::fabs(gamma))); // d_WP in dissertation of S. Donath, 2011
+
+ // line 9 in Algorithm 6.2 in dissertation of S. Donath, 2011
+ // division by zero not possible as delta==0 is caught above
+ real_t radius = real_c(0.5) * wallPointDistance / std::sin(real_c(0.5) * real_c(std::fabs(delta)));
+
+ // check wallPointDistance for being in a valid range (to avoid degenerated triangles)
+ real_t artificialWallPointDistance = wallPointDistance; // d'_WP in dissertation of S. Donath, 2011
+
+ if (wallPointDistance < real_c(0.8))
+ {
+ // extend distance with a heuristically chosen tolerance such that the point is not thrown away when checking
+ // for degenerated triangles in the curvature computation
+ artificialWallPointDistance = real_c(0.801);
+
+ // if extended distance exceeds circle diameter, assume delta=90 degrees
+ if (artificialWallPointDistance > real_c(2) * radius)
+ {
+ radius = artificialWallPointDistance * math::one_div_root_two;
+ }
+ }
+ else
+ {
+ // reduce distance with heuristically chosen tolerance
+ if (wallPointDistance > real_c(1.8)) { artificialWallPointDistance = real_c(1.799); }
+ }
+
+ // line 17 in Algorithm 6.2 in dissertation of S. Donath, 2011
+ const real_t artificialDelta =
+ real_c(2) * real_c(std::asin(real_c(0.5) * artificialWallPointDistance /
+ real_c(radius))); // delta' in dissertation of S. Donath, 2011
+
+ // line 18 in Algorithm 6.2 in dissertation of S. Donath, 2011
+ Vector3< real_t > rotVec = cross(normal, obstacleNormal);
+
+ // change direction of rotation axis for delta>0; this is in contrast to Algorithm 6.2 in dissertation of Stefan
+ // Donath, 2011 but was found to be necessary as otherwise the artificialWallNormal points in the wrong direction
+ if (delta > real_c(0)) { rotVec *= real_c(-1); }
+
+ // line 19 in Algorithm 6.2 in dissertation of S. Donath, 2011
+ const Matrix3< real_t > rotMat(rotVec, artificialDelta);
+
+ // line 20 in Algorithm 6.2 in dissertation of S. Donath, 2011
+ artificialWallNormal = rotMat * normal;
+
+ // line 21 in Algorithm 6.2 in dissertation of S. Donath, 2011
+ if (theta < alpha)
+ {
+ artificialWallPointCoord = globalInterfacePointLocation + radius * (normal - artificialWallNormal);
+ }
+ else { artificialWallPointCoord = globalInterfacePointLocation - radius * (normal - artificialWallNormal); }
+
+ return true;
+ }
+}
+
+Vector3< real_t > getInterfacePoint(const Vector3< real_t >& normal, real_t fillLevel)
+{
+ // exploit symmetries of cubic cell to simplify the algorithm, i.e., restrict the fill level to the interval
+ // [0,0.5] (see dissertation of T. Pohl, 2008, p. 22f)
+ bool fillMirrored = false;
+ if (fillLevel >= real_c(0.5))
+ {
+ fillMirrored = true;
+ fillLevel = real_c(1) - fillLevel;
+ }
+
+ // sort normal components such that nx, ny, nz >= 0 and nx <= ny <= nz to simplify the algorithm
+ Vector3< real_t > normalSorted = fabs(normal);
+ if (normalSorted[0] > normalSorted[1])
+ {
+ // swap nx and ny
+ real_t tmp = normalSorted[0];
+ normalSorted[0] = normalSorted[1];
+ normalSorted[1] = tmp;
+ }
+
+ if (normalSorted[1] > normalSorted[2])
+ {
+ // swap ny and nz
+ real_t tmp = normalSorted[1];
+ normalSorted[1] = normalSorted[2];
+ normalSorted[2] = tmp;
+
+ if (normalSorted[0] > normalSorted[1])
+ {
+ // swap nx and ny
+ tmp = normalSorted[0];
+ normalSorted[0] = normalSorted[1];
+ normalSorted[1] = tmp;
+ }
+ }
+
+ // minimal and maximal plane offset chosen as in the dissertation of T. Pohl, 2008, p. 22
+ real_t offsetMin = real_c(-0.866025); // sqrt(3/4), lowest possible value
+ real_t offsetMax = real_c(0);
+
+ // find correct interface position by bisection (Algorithm 2.1, p. 22 in dissertation of T. Pohl, 2008)
+ const uint_t numBisections =
+ uint_c(10); // number of bisections, =10 in dissertation of T. Pohl, 2008 (heuristically chosen)
+
+ for (uint_t i = uint_c(0); i <= numBisections; ++i)
+ {
+ const real_t offsetTmp = real_c(0.5) * (offsetMin + offsetMax);
+ const real_t newFillLevel = computeCellFluidVolume(normalSorted, offsetTmp);
+
+ // volume is too small, reduce upper bound
+ if (newFillLevel > fillLevel) { offsetMax = offsetTmp; }
+
+ // volume is too large, reduce lower bound
+ else { offsetMin = offsetTmp; }
+ }
+ real_t offset = real_c(0.5) * (offsetMin + offsetMax);
+
+ if (fillMirrored) { offset *= real_c(-1); }
+ const Vector3< real_t > interfacePoint = Vector3< real_t >(real_c(0.5)) + offset * normal;
+
+ return interfacePoint;
+}
+
+real_t getCellEdgeIntersection(const Vector3< real_t >& edgePoint, const Vector3< real_t >& edgeDirection,
+ const Vector3< real_t >& normal, const Vector3< real_t >& surfacePoint)
+{
+ //#ifndef BELOW_CELL
+ //# define BELOW_CELL (-10)
+ //#endif
+
+#ifndef ABOVE_CELL
+# define ABOVE_CELL (-20)
+#endif
+ // mathematical description:
+ // surface plane in coordinate form: x * normal = surfacePoint * normal
+ // cell edge line: edgePoint + lambda * edgeDirection
+ // => point of intersection: lambda = (interfacePoint * normal - edgePoint * normal) / edgeDirection * normal
+
+ // compute angle between normal and cell edge
+ real_t cosAngle = dot(edgeDirection, normal);
+
+ real_t intersection = real_c(0);
+
+ // intersection exists only if angle is not 90°, i.e., (intersection != 0)
+ if (std::fabs(cosAngle) >= real_c(1e-14))
+ {
+ intersection = ((surfacePoint - edgePoint) * normal) / cosAngle;
+
+ // // intersection is below cell
+ // if (intersection < real_c(0)) { intersection = real_c(BELOW_CELL); }
+
+ // intersection is above cell
+ if (intersection > real_c(1)) { intersection = real_c(ABOVE_CELL); }
+ }
+ else // no intersection if angle is 90° (intersection == 0)
+ {
+ intersection = real_c(-1);
+ }
+
+ return intersection;
+}
+
+real_t computeCellFluidVolume(const Vector3< real_t >& normal, real_t offset)
+{
+ const Vector3< real_t > interfacePoint = Vector3< real_t >(real_c(0.5)) + offset * normal;
+
+ real_t volume = real_c(0);
+
+ // stores points of intersection with cell edges; points are shifted along normal such that the points lay
+ // on one plane and surface area can be calculated
+ std::vector< Vector3< real_t > > points;
+
+ // SW: south west, EB: east bottom, etc.
+ real_t iSW = getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(0), real_c(0)),
+ Vector3< real_t >(real_c(0), real_c(0), real_c(1)), normal, interfacePoint);
+
+ // if no intersection with edge SW, volume is zero
+ if (iSW > real_c(0) || realIsIdentical(iSW, ABOVE_CELL))
+ {
+ real_t iSE = getCellEdgeIntersection(Vector3< real_t >(real_c(1), real_c(0), real_c(0)),
+ Vector3< real_t >(real_c(0), real_c(0), real_c(1)), normal, interfacePoint);
+ real_t iNW = getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(1), real_c(0)),
+ Vector3< real_t >(real_c(0), real_c(0), real_c(1)), normal, interfacePoint);
+ real_t iNE = getCellEdgeIntersection(Vector3< real_t >(real_c(1), real_c(1), real_c(0)),
+ Vector3< real_t >(real_c(0), real_c(0), real_c(1)), normal, interfacePoint);
+
+ // simple case: all four vertices are included in fluid domain (see Figure 2.12, p. 24 in dissertation of Thomas
+ // Pohl, 2008)
+ if (iNE > real_c(0)) { volume = real_c(0.25) * (iSW + iSE + iNW + iNE); }
+ else
+ {
+ if (iSE >= real_c(0))
+ {
+ real_t iEB =
+ getCellEdgeIntersection(Vector3< real_t >(real_c(1), real_c(0), real_c(0)),
+ Vector3< real_t >(real_c(0), real_c(1), real_c(0)), normal, interfacePoint);
+
+ // shift intersection points along normal and store points
+ points.push_back(Vector3< real_t >(real_c(1), real_c(0), real_c(iSE)) - interfacePoint);
+ points.push_back(Vector3< real_t >(real_c(1), real_c(iEB), real_c(0)) - interfacePoint);
+
+ volume += iSE * iEB;
+ }
+ else
+ {
+ real_t iSB =
+ getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(0), real_c(0)),
+ Vector3< real_t >(real_c(1), real_c(0), real_c(0)), normal, interfacePoint);
+
+ points.push_back(Vector3< real_t >(real_c(iSB), real_c(0), real_c(0)) - interfacePoint);
+ }
+
+ if (iNW >= real_c(0))
+ {
+ real_t iNB =
+ getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(1), real_c(0)),
+ Vector3< real_t >(real_c(1), real_c(0), real_c(0)), normal, interfacePoint);
+
+ points.push_back(Vector3< real_t >(real_c(iNB), real_c(1), real_c(0)) - interfacePoint);
+ points.push_back(Vector3< real_t >(real_c(0), real_c(1), real_c(iNW)) - interfacePoint);
+
+ volume += iNB * iNW;
+ }
+ else
+ {
+ real_t iWB =
+ getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(0), real_c(0)),
+ Vector3< real_t >(real_c(0), real_c(1), real_c(0)), normal, interfacePoint);
+
+ points.push_back(Vector3< real_t >(real_c(0), real_c(iWB), real_c(0)) - interfacePoint);
+ }
+
+ real_t iWT =
+ getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(0), real_c(1)),
+ Vector3< real_t >(real_c(0), real_c(1), real_c(0)), normal, interfacePoint);
+ if (iWT >= real_c(0))
+ {
+ real_t iST =
+ getCellEdgeIntersection(Vector3< real_t >(real_c(0), real_c(0), real_c(1)),
+ Vector3< real_t >(real_c(1), real_c(0), real_c(0)), normal, interfacePoint);
+
+ points.push_back(Vector3< real_t >(real_c(0), real_c(iWT), real_c(1)) - interfacePoint);
+ points.push_back(Vector3< real_t >(real_c(iST), real_c(0), real_c(1)) - interfacePoint);
+
+ volume += iWT * iST;
+ }
+ else { points.push_back(Vector3< real_t >(real_c(0), real_c(0), real_c(iSW)) - interfacePoint); }
+
+ Vector3< real_t > vectorProduct(real_c(0));
+ real_t area = real_c(0);
+ size_t j = points.size() - 1;
+
+ // compute the vector product, the length of which gives the surface area of the corresponding
+ // parallelogram;
+ for (size_t i = 0; i != points.size(); ++i)
+ {
+ vectorProduct[0] = points[i][1] * points[j][2] - points[i][2] * points[j][1];
+ vectorProduct[1] = points[i][2] * points[j][0] - points[i][0] * points[j][2];
+ vectorProduct[2] = points[i][0] * points[j][1] - points[i][1] * points[j][0];
+
+ // area of the triangle is obtained through division by 2; this is done below in the volume
+ // calculation (where the division is then by 6 instead of by 3)
+ area += vectorProduct.length();
+ j = i;
+ }
+
+ // compute and sum the volumes of each resulting pyramid: V = area * height * 1/3
+ volume += area * (normal * interfacePoint);
+ volume /= real_c(6.0); // division by 6 since the area was not divided by 2 above
+ }
+ }
+ else // no intersection with edge SW, volume is zero
+ {
+ volume = real_c(0);
+ }
+
+ return volume;
+}
+} // namespace free_surface
+} // namespace walberla
diff --git a/src/lbm/free_surface/surface_geometry/Utility.h b/src/lbm/free_surface/surface_geometry/Utility.h
new file mode 100644
index 0000000000000000000000000000000000000000..7be227e8cc98ae75ad3b14d3044a37accd910c3b
--- /dev/null
+++ b/src/lbm/free_surface/surface_geometry/Utility.h
@@ -0,0 +1,68 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file Utility.h
+//! \ingroup surface_geometry
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Helper functions for surface geometry computations.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/math/Vector3.h"
+
+#include "ContactAngle.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+/***********************************************************************************************************************
+ * Compute the point p that lays on the plane of the interface surface (see Algorithm 2.1 in dissertation of Thomas
+ * Pohl, 2008). p = (0.5, 0.5, 0.5) + offset * normal.
+ **********************************************************************************************************************/
+Vector3< real_t > getInterfacePoint(const Vector3< real_t >& normal, real_t fillLevel);
+
+/***********************************************************************************************************************
+ * Compute the intersection point of a surface (defined by normal and surfacePoint) with an edge of a cell.
+ **********************************************************************************************************************/
+real_t getCellEdgeIntersection(const Vector3< real_t >& edgePoint, const Vector3< real_t >& edgeDirection,
+ const Vector3< real_t >& normal, const Vector3< real_t >& surfacePoint);
+
+/***********************************************************************************************************************
+ * Compute the fluid volume within an interface cell with respect to
+ * - the interface normal
+ * - the interface surface offset.
+ *
+ * see dissertation of T. Pohl, 2008, section 2.5.3, p. 23-26.
+ **********************************************************************************************************************/
+real_t computeCellFluidVolume(const Vector3< real_t >& normal, real_t offset);
+
+/***********************************************************************************************************************
+ * Compute an artificial wall point according to the artifical curvature wetting model from the dissertation of Stefan
+ * Donath, 2011. The artificial wall point and the artificial normal can be used to alter the curvature computation with
+ * local triangulation. The interface curvature is changed such that the correct laplace pressure with respect to the
+ * contact angle is assumed near solid cells.
+ *
+ * see dissertation of T. Pohl, 2008, section 6.3.3
+ **********************************************************************************************************************/
+bool computeArtificalWallPoint(const Vector3< real_t >& globalInterfacePointLocation,
+ const Vector3< real_t >& globalCellCoordinate, const Vector3< real_t >& normal,
+ const Vector3< real_t >& wallNormal, const Vector3< real_t >& obstacleNormal,
+ const ContactAngle& contactAngle, Vector3< real_t >& artificialWallPointCoord,
+ Vector3< real_t >& artificialWallNormal);
+} // namespace free_surface
+} // namespace walberla
diff --git a/tests/lbm/CMakeLists.txt b/tests/lbm/CMakeLists.txt
index d34cb0684b80ba7292dcf616c5c9a25cf2efd98f..bb8d6dd57faf11a0e0bf97523190bd2da8b39e46 100644
--- a/tests/lbm/CMakeLists.txt
+++ b/tests/lbm/CMakeLists.txt
@@ -130,10 +130,10 @@ waLBerla_compile_test( FILES codegen/FieldLayoutAndVectorizationTest.cpp DEPENDS
waLBerla_execute_test( NAME FieldLayoutAndVectorizationTest )
waLBerla_generate_target_from_python(NAME LbmPackInfoGenerationTestCodegen FILE codegen/LbmPackInfoGenerationTest.py
- OUT_FILES AccessorBasedPackInfoEven.cpp AccessorBasedPackInfoEven.h
- AccessorBasedPackInfoOdd.cpp AccessorBasedPackInfoOdd.h
- FromKernelPackInfoPull.cpp FromKernelPackInfoPull.h
- FromKernelPackInfoPush.cpp FromKernelPackInfoPush.h)
+ OUT_FILES AccessorBasedPackInfoEven.cpp AccessorBasedPackInfoEven.h
+ AccessorBasedPackInfoOdd.cpp AccessorBasedPackInfoOdd.h
+ FromKernelPackInfoPull.cpp FromKernelPackInfoPull.h
+ FromKernelPackInfoPush.cpp FromKernelPackInfoPush.h)
waLBerla_link_files_to_builddir( "diff_packinfos.sh" )
waLBerla_execute_test( NAME LbmPackInfoGenerationDiffTest COMMAND bash diff_packinfos.sh )
@@ -170,3 +170,139 @@ waLBerla_compile_test( FILES codegen/StreamInCellIntervalCodegenTest.cpp
waLBerla_execute_test( NAME StreamInCellIntervalCodegenTest )
endif()
+
+# Free Surface
+waLBerla_compile_test( FILES free_surface/bubble_model/BubbleInitializationTest.cpp
+ DEPENDS blockforest field geometry lbm timeloop )
+waLBerla_execute_test( NAME BubbleInitializationTest
+ PROCESSES 2 )
+
+file( COPY free_surface/bubble_model/MergeAndSplitTestUnconnected.png
+ free_surface/bubble_model/MergeAndSplitTestConnected.png
+ DESTINATION ${CMAKE_CURRENT_BINARY_DIR} )
+waLBerla_compile_test( FILES free_surface/bubble_model/MergeAndSplitTest.cpp
+ free_surface/bubble_model/BubbleBodyMover.impl.h
+ free_surface/bubble_model/BubbleModelTester.impl.h
+ DEPENDS blockforest field lbm timeloop )
+waLBerla_execute_test( NAME MergeAndSplitTest
+ PROCESSES 10 )
+
+waLBerla_compile_test( FILES free_surface/bubble_model/MergeInformationTest.cpp
+ DEPENDS blockforest field lbm timeloop )
+waLBerla_execute_test( NAME MergeInformationTest
+ PROCESSES 3 )
+
+waLBerla_compile_test( FILES free_surface/bubble_model/MovingSpheresTest.cpp
+ free_surface/bubble_model/BubbleBodyMover.impl.h
+ free_surface/bubble_model/BubbleModelTester.impl.h
+ DEPENDS blockforest field geometry lbm timeloop )
+waLBerla_execute_test( NAME MovingSpheresTest
+ PROCESSES 2 )
+
+waLBerla_compile_test( FILES free_surface/bubble_model/RegionalFloodFillTest.cpp
+ DEPENDS field lbm )
+waLBerla_execute_test( NAME RegionalFloodFillTest )
+
+waLBerla_compile_test( FILES free_surface/bubble_model/SplitDetectionTest.cpp
+ DEPENDS field lbm)
+waLBerla_execute_test( NAME SplitDetectionTest )
+
+waLBerla_compile_test( FILES free_surface/dynamics/AdvectionTest.cpp
+ DEPENDS blockforest field lbm timeloop )
+waLBerla_execute_test( NAME AdvectionTest )
+
+waLBerla_compile_test( FILES free_surface/dynamics/CellConversionTest.cpp
+ DEPENDS blockforest field lbm timeloop )
+waLBerla_execute_test( NAME CellConversionTest )
+
+if( WALBERLA_BUILD_WITH_CODEGEN )
+ walberla_generate_target_from_python( NAME LatticeModelGenerationFreeSurfacePython
+ FILE free_surface/dynamics/LatticeModelGenerationFreeSurface.py
+ OUT_FILES GeneratedLatticeModel_FreeSurface.cpp
+ GeneratedLatticeModel_FreeSurface.h )
+ waLBerla_compile_test( FILES free_surface/dynamics/CodegenTest.cpp
+ DEPENDS blockforest field lbm timeloop LatticeModelGenerationFreeSurfacePython )
+ waLBerla_execute_test( NAME CodegenTest )
+endif()
+
+waLBerla_compile_test( FILES free_surface/dynamics/ExcessMassDistributionFallbackTest.cpp
+ DEPENDS blockforest field lbm timeloop )
+waLBerla_execute_test( NAME ExcessMassDistributionFallbackTest )
+
+waLBerla_compile_test( FILES free_surface/dynamics/ExcessMassDistributionParallelTest.cpp
+ DEPENDS blockforest field lbm timeloop )
+waLBerla_execute_test( NAME ExcessMassDistributionParallelTest
+ PROCESSES 2)
+
+waLBerla_compile_test( FILES free_surface/dynamics/InflowTest.cpp
+ DEPENDS blockforest field lbm timeloop )
+waLBerla_execute_test( NAME InflowTest )
+
+waLBerla_compile_test( FILES free_surface/LoadBalancingTest.cpp
+ DEPENDS blockforest field lbm timeloop )
+waLBerla_execute_test( NAME LoadBalancingTest
+ PROCESSES 4)
+
+waLBerla_compile_test( FILES free_surface/dynamics/PdfReconstructionFreeSlipTest.cpp
+ DEPENDS blockforest field lbm timeloop )
+waLBerla_execute_test( NAME PdfReconstructionFreeSlipTest )
+
+waLBerla_compile_test( FILES free_surface/dynamics/PdfReconstructionTest.cpp
+ DEPENDS blockforest field lbm timeloop )
+waLBerla_execute_test( NAME PdfReconstructionTest )
+
+waLBerla_compile_test( FILES free_surface/dynamics/PdfRefillingTest.cpp
+ DEPENDS blockforest field lbm timeloop )
+waLBerla_execute_test( NAME PdfRefillingTest )
+
+waLBerla_compile_test( FILES free_surface/dynamics/WettingConversionTest.cpp
+ DEPENDS blockforest field geometry lbm timeloop )
+waLBerla_execute_test( NAME WettingConversionTest )
+
+waLBerla_compile_test( FILES free_surface/surface_geometry/CellFluidVolumeTest.cpp
+ DEPENDS lbm )
+waLBerla_execute_test( NAME CellFluidVolumeTest )
+
+waLBerla_compile_test( FILES free_surface/surface_geometry/CurvatureOfSineTest.cpp
+ DEPENDS blockforest field lbm timeloop )
+waLBerla_execute_test( NAME CurvatureOfSineTest )
+
+waLBerla_compile_test( FILES free_surface/surface_geometry/CurvatureOfSphereTest.cpp
+ DEPENDS blockforest field geometry lbm timeloop )
+waLBerla_execute_test( NAME CurvatureOfSphereTest )
+
+waLBerla_compile_test( FILES free_surface/surface_geometry/DetectWettingTest.cpp
+ DEPENDS blockforest field lbm timeloop )
+waLBerla_execute_test( NAME DetectWettingTest )
+
+waLBerla_compile_test( FILES free_surface/surface_geometry/GetInterfacePointTest.cpp
+ DEPENDS lbm )
+waLBerla_execute_test( NAME GetInterfacePointTest )
+
+waLBerla_compile_test( FILES free_surface/surface_geometry/NormalsOfSineTest.cpp
+ DEPENDS blockforest field lbm timeloop )
+waLBerla_execute_test( NAME NormalsOfSineTest )
+
+waLBerla_compile_test( FILES free_surface/surface_geometry/NormalsOfSphereTest.cpp
+ DEPENDS blockforest field geometry lbm timeloop )
+waLBerla_execute_test( NAME NormalsOfSphereTest )
+
+waLBerla_compile_test( FILES free_surface/surface_geometry/NormalsEquivalenceTest.cpp
+ DEPENDS blockforest field lbm timeloop )
+waLBerla_execute_test( NAME NormalsEquivalenceTest )
+
+waLBerla_compile_test( FILES free_surface/surface_geometry/NormalsNearSolidTest.cpp
+ DEPENDS blockforest field lbm timeloop )
+waLBerla_execute_test( NAME NormalsNearSolidTest )
+
+waLBerla_compile_test( FILES free_surface/surface_geometry/ObstacleFillLevelTest.cpp
+ DEPENDS blockforest field lbm timeloop )
+waLBerla_execute_test( NAME ObstacleFillLevelTest )
+
+waLBerla_compile_test( FILES free_surface/surface_geometry/ObstacleNormalsTest.cpp
+ DEPENDS blockforest field lbm timeloop )
+waLBerla_execute_test( NAME ObstacleNormalsTest )
+
+waLBerla_compile_test( FILES free_surface/surface_geometry/WettingCurvatureTest.cpp
+ DEPENDS blockforest field lbm timeloop )
+waLBerla_execute_test( NAME WettingCurvatureTest )
\ No newline at end of file
diff --git a/tests/lbm/free_surface/LoadBalancingTest.cpp b/tests/lbm/free_surface/LoadBalancingTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..455dc2e17455b691ddbaa24a6fb4f4a069c08a93
--- /dev/null
+++ b/tests/lbm/free_surface/LoadBalancingTest.cpp
@@ -0,0 +1,192 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file LoadBalancingTest.cpp
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Test FSLBM load balancing in simplistic setup with 3x3x1 blocks on a 12x12x1 domain.
+//
+//! An initially less optimal weight distribution should be increased after performing load balancing.
+//======================================================================================================================
+
+#include "lbm/free_surface/LoadBalancing.h"
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+
+#include "lbm/blockforest/communication/SimpleCommunication.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface/BlockStateDetectorSweep.h"
+#include "lbm/free_surface/boundary/FreeSurfaceBoundaryHandling.h"
+#include "lbm/lattice_model/D2Q9.h"
+
+#include "timeloop/SweepTimeloop.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace LoadBalancingTest
+{
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+
+using LatticeModel_T = lbm::D2Q9< lbm::collision_model::SRT >;
+using Stencil_T = LatticeModel_T::Stencil;
+
+using Communication_T = blockforest::SimpleCommunication< Stencil_T >;
+
+using FlagField_T = FlagField< uint32_t >;
+using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment walberlaEnv(argc, argv);
+
+ // define the domain size
+ const Vector3< uint_t > domainSize(uint_c(12), uint_c(12), uint_c(1));
+ const Vector3< uint_t > cellsPerBlock(uint_c(3), uint_c(3), uint_c(1));
+ const Vector3< uint_t > periodicity(uint_c(0), uint_c(0), uint_c(0));
+
+ Vector3< uint_t > numBlocks;
+ numBlocks[0] = uint_c(std::ceil(domainSize[0] / cellsPerBlock[0]));
+ numBlocks[1] = uint_c(std::ceil(domainSize[1] / cellsPerBlock[1]));
+ numBlocks[2] = uint_c(std::ceil(domainSize[2] / cellsPerBlock[2]));
+
+ uint_t numProcesses = uint_c(MPIManager::instance()->numProcesses());
+
+ WALBERLA_CHECK_EQUAL(numProcesses, uint_c(4), "This test must be executed with four MPI processes.")
+
+ WALBERLA_CHECK_LESS_EQUAL(numProcesses, numBlocks[0] * numBlocks[1] * numBlocks[2],
+ "The number of MPI processes is greater than the number of blocks as defined by "
+ "\"domainSize/cellsPerBlock\". This would result in unused MPI processes. Either decrease "
+ "the number of MPI processes or increase \"cellsPerBlock\".")
+
+ // create non-uniform block forest (non-uniformity required for load balancing)
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ createNonUniformBlockForest(domainSize, cellsPerBlock, numBlocks, periodicity);
+
+ // create (dummy) lattice model with dummy PDF field
+ LatticeModel_T latticeModel = LatticeModel_T(lbm::collision_model::SRT(real_c(1.0)));
+ const BlockDataID pdfFieldID = lbm::addPdfFieldToStorage(blockForest, "PDF field", latticeModel, field::fzyx);
+
+ const BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill level field", real_c(0.0), field::fzyx, uint_c(1));
+
+ // initialize fill level field
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ ScalarField_T* const fillField = blockIt->getData< ScalarField_T >(fillFieldID);
+ WALBERLA_FOR_ALL_CELLS(fillFieldIt, fillField, {
+ // cell in block-local coordinates
+ const Cell localCell = fillFieldIt.cell();
+
+ // get cell in global coordinates
+ Cell globalCell = fillFieldIt.cell();
+ blockForest->transformBlockLocalToGlobalCell(globalCell, *blockIt, localCell);
+
+ // set liquid cells
+ if (globalCell[1] < cell_idx_c(5)) { *fillFieldIt = real_c(1); }
+
+ // set interface cells
+ if (globalCell[1] == cell_idx_c(5)) { *fillFieldIt = real_c(0.5); }
+
+ // set gas cells
+ if (globalCell[1] > cell_idx_c(5)) { *fillFieldIt = real_c(0); }
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ // create boundary handling for initializing flag field
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+ freeSurfaceBoundaryHandling->setNoSlipAtAllBorders(cell_idx_c(-1));
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+
+ // communication after initialization
+ Communication_T communication(blockForest, flagFieldID, fillFieldID);
+ communication();
+
+ Communication_T pdfCommunication(blockForest, pdfFieldID);
+ pdfCommunication();
+
+ // create bubble model
+ std::shared_ptr< bubble_model::BubbleModelBase > bubbleModel =
+ std::make_shared< bubble_model::BubbleModelConstantPressure >(real_c(1));
+
+ // detect block states (detection performed during construction)
+ BlockStateDetectorSweep< FlagField_T > blockStateDetector(blockForest, flagInfo, flagFieldID);
+
+ // the initialization as chosen above results in the following block states
+ // |G|G|G| with G: onlyGasAndBoundary
+ // |F|F|F| F: fullFreeSurface
+ // |F|F|F| L: onlyLBM
+ // |L|L|L|
+ //
+ // Note that the blocks in row 3 have also state F, although they only consist of gas cells. This is because there is
+ // an interface cell in the ghost layer that is synchronized from the blocks of row 2. The BlockStateDetectorSweep
+ // also checks the ghost layer, as e.g. during cell conversion, a block having an interface cell in its ghost layer
+ // must also perform a corresponding conversion on its inner cells.
+
+ uint_t blockWeightFullFreeSurface = uint_c(50);
+ uint_t blockWeightOnlyLBM = uint_c(10);
+ uint_t blockWeightOnlyGasAndBoundary = uint_c(5);
+
+ // evaluate process loads
+ ProcessLoadEvaluator< FlagField_T > loadEvaluator(blockForest, blockWeightFullFreeSurface, blockWeightOnlyLBM,
+ blockWeightOnlyGasAndBoundary, uint_c(1));
+
+ // evaluate weight distribution on processes
+ std::vector< real_t > weightSum = loadEvaluator.computeWeightSumPerProcess();
+
+ // initial weight distribution before load balancing
+ WALBERLA_ROOT_SECTION()
+ {
+ WALBERLA_LOG_DEVEL("Checking initial weight distribution")
+ WALBERLA_CHECK_FLOAT_EQUAL(weightSum[0], real_c(40), real_c(1e-14));
+ WALBERLA_CHECK_FLOAT_EQUAL(weightSum[1], real_c(200), real_c(1e-14));
+ WALBERLA_CHECK_FLOAT_EQUAL(weightSum[2], real_c(200), real_c(1e-14));
+ WALBERLA_CHECK_FLOAT_EQUAL(weightSum[3], real_c(20), real_c(1e-14));
+ }
+
+ // perform load balancing
+ LoadBalancer< FlagField_T, Stencil_T, Stencil_T > loadBalancer(
+ blockForest, communication, pdfCommunication, bubbleModel, blockWeightFullFreeSurface, blockWeightOnlyLBM,
+ blockWeightOnlyGasAndBoundary, uint_c(1), false);
+ loadBalancer();
+
+ // evaluate weight distribution on processes
+ weightSum = loadEvaluator.computeWeightSumPerProcess();
+
+ // check weight distribution after load balancing
+ WALBERLA_ROOT_SECTION()
+ {
+ WALBERLA_LOG_DEVEL("Checking weight distribution after load balancing")
+ WALBERLA_CHECK_FLOAT_EQUAL(weightSum[0], real_c(140), real_c(1e-14));
+ WALBERLA_CHECK_FLOAT_EQUAL(weightSum[1], real_c(100), real_c(1e-14));
+ WALBERLA_CHECK_FLOAT_EQUAL(weightSum[2], real_c(100), real_c(1e-14));
+ WALBERLA_CHECK_FLOAT_EQUAL(weightSum[3], real_c(120), real_c(1e-14));
+ }
+
+ return EXIT_SUCCESS;
+}
+} // namespace LoadBalancingTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::LoadBalancingTest::main(argc, argv); }
diff --git a/tests/lbm/free_surface/bubble_model/BubbleBodyMover.h b/tests/lbm/free_surface/bubble_model/BubbleBodyMover.h
new file mode 100644
index 0000000000000000000000000000000000000000..f36124fcd685f00c2b9f13df7ad5fb8827807a7b
--- /dev/null
+++ b/tests/lbm/free_surface/bubble_model/BubbleBodyMover.h
@@ -0,0 +1,71 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file BubbleBodyMover.h
+//! \ingroup lbm/free_surface/bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Helper class for bubble model test cases.
+//!
+//! Add bubbles that are represented by geometric bodies. Move the bubbles by updating the fill level and flag field.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "geometry/initializer/OverlapFieldFromBody.h"
+
+#include "BubbleModelTester.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+template< typename Body_T, typename Stencil_T >
+class BubbleBodyMover : public BubbleModelTester< Stencil_T >
+{
+ public:
+ BubbleBodyMover(const std::shared_ptr< StructuredBlockStorage >& blockStorage,
+ const std::shared_ptr< BubbleModel< Stencil_T > >& bubbleModel);
+
+ inline const std::vector< Body_T >& getBodies() const { return bodies_; }
+
+ void addBody(const Body_T& b, std::function< void(Body_T&) > moveFunction)
+ {
+ bodies_.push_back(b);
+ moveFunctions_.push_back(moveFunction);
+ }
+
+ // initialize the added bodies in the fill level and flag fields, and in the bubble model
+ void initAddedBodies();
+
+ protected:
+ void updateDestinationFields() override;
+
+ std::vector< Body_T > bodies_;
+
+ std::vector< std::function< void(Body_T&) > > moveFunctions_;
+
+ geometry::initializer::OverlapFieldFromBody srcFillInitializer_;
+ geometry::initializer::OverlapFieldFromBody dstFillInitializer_;
+};
+
+} // namespace bubble_model
+} // namespace free_surface
+} // namespace walberla
+
+#include "BubbleBodyMover.impl.h"
\ No newline at end of file
diff --git a/tests/lbm/free_surface/bubble_model/BubbleBodyMover.impl.h b/tests/lbm/free_surface/bubble_model/BubbleBodyMover.impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..f06d6ed6845e07173d04a497916975ea9d4ab659
--- /dev/null
+++ b/tests/lbm/free_surface/bubble_model/BubbleBodyMover.impl.h
@@ -0,0 +1,99 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file BubbleBodyMover.impl.h
+//! \ingroup lbm/free_surface/bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//
+//======================================================================================================================
+
+#include "geometry/bodies/AABBBody.h"
+#include "geometry/bodies/Ellipsoid.h"
+#include "geometry/bodies/Sphere.h"
+
+#include "lbm/free_surface/bubble_model/Geometry.h"
+
+#include "BubbleBodyMover.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+template< typename Body_T, typename Stencil_T >
+BubbleBodyMover< Body_T, Stencil_T >::BubbleBodyMover(const std::shared_ptr< StructuredBlockStorage >& blockStorage,
+ const std::shared_ptr< BubbleModel< Stencil_T > >& bubbleModel)
+ : BubbleModelTester< Stencil_T >(blockStorage, bubbleModel),
+ srcFillInitializer_(*blockStorage, BubbleModelTester< Stencil_T >::srcFillLevelFieldID_),
+ dstFillInitializer_(*blockStorage, BubbleModelTester< Stencil_T >::dstFillLevelFieldID_)
+{}
+
+template< typename Body_T, typename Stencil_T >
+void BubbleBodyMover< Body_T, Stencil_T >::initAddedBodies()
+{
+ // initialize fill levels
+ for (auto body = bodies_.begin(); body != bodies_.end(); ++body)
+ {
+ srcFillInitializer_.init(*body, false);
+ dstFillInitializer_.init(*body, false);
+ }
+
+ // set flags
+ BubbleModelTester< Stencil_T >::srcFlagsFromSrcFills();
+ BubbleModelTester< Stencil_T >::dstFlagsFromDstFills();
+
+ // initialize bubble model
+ BubbleModelTester< Stencil_T >::bubbleModel_->initFromFillLevelField(
+ BubbleModelTester< Stencil_T >::dstFillLevelFieldID_);
+}
+
+template< typename Body_T, typename Stencil_T >
+void BubbleBodyMover< Body_T, Stencil_T >::updateDestinationFields()
+{
+ using BubbleModelTester_T = BubbleModelTester< Stencil_T >;
+
+ // move bodies according to moveFunctions_
+ for (uint_t i = uint_c(0); i < bodies_.size(); ++i)
+ {
+ moveFunctions_[i](bodies_[i]);
+ }
+
+ // clear destination field
+ for (auto blockIt = this->blockStorage_->begin(); blockIt != this->blockStorage_->end(); ++blockIt)
+ {
+ typename BubbleModelTester_T::FlagField_T* const flagField =
+ blockIt->template getData< typename BubbleModelTester_T::FlagField_T >(this->dstFlagFieldID_);
+ typename BubbleModelTester_T::ScalarField_T* const fillField =
+ blockIt->template getData< typename BubbleModelTester_T::ScalarField_T >(this->dstFillLevelFieldID_);
+
+ flagField->setWithGhostLayer(typename BubbleModelTester_T::flag_t(0));
+ fillField->setWithGhostLayer(real_c(1.0));
+ }
+
+ // update fill level field with new body position
+ for (auto body = bodies_.begin(); body != bodies_.end(); ++body)
+ {
+ dstFillInitializer_.init(*body, false);
+ }
+
+ // update flags
+ this->dstFlagsFromDstFills();
+}
+
+} // namespace bubble_model
+} // namespace free_surface
+} // namespace walberla
diff --git a/tests/lbm/free_surface/bubble_model/BubbleInitializationTest.cpp b/tests/lbm/free_surface/bubble_model/BubbleInitializationTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..08641c5b839a4e7f6e38ff3a71ce97c1966fd612
--- /dev/null
+++ b/tests/lbm/free_surface/bubble_model/BubbleInitializationTest.cpp
@@ -0,0 +1,154 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file BubbleInitializationTest.cpp
+//! \ingroup lbm/free_surface/bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Test bubble initialization from fill level by evaluating initial bubble volumes (within and across blocks).
+//
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+#include "core/math/Constants.h"
+#include "core/mpi/MPIManager.h"
+
+#include "field/AddToStorage.h"
+#include "field/Printers.h"
+
+#include "geometry/bodies/Sphere.h"
+
+#include "lbm/free_surface/bubble_model/BubbleModel.h"
+#include "lbm/free_surface/bubble_model/Geometry.h"
+
+#include "stencil/D2Q9.h"
+#include "stencil/D3Q19.h"
+#include "stencil/D3Q27.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace BubbleInitializationTest
+{
+// define field
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+
+// class derived from BubbleModel to access its protected members for testing purposes
+template< typename Stencil_T >
+class BubbleModelTest : public bubble_model::BubbleModel< Stencil_T >
+{
+ public:
+ BubbleModelTest(const std::shared_ptr< StructuredBlockForest >& blockForest)
+ : bubble_model::BubbleModel< Stencil_T >(blockForest, true)
+ {}
+
+ real_t getBubbleInitVolume(bubble_model::BubbleID id)
+ {
+ WALBERLA_ASSERT_GREATER(bubble_model::BubbleModel< Stencil_T >::getBubbles().size(), id);
+ return bubble_model::BubbleModel< Stencil_T >::getBubbles()[id].getInitVolume();
+ }
+}; // class BubbleModelTest
+
+template< typename Stencil_T >
+void testBubbleInitialization()
+{
+ // define the domain size
+ const Vector3< uint_t > numBlocks(uint_c(2), uint_c(1), uint_c(1));
+ const Vector3< uint_t > domainSize(uint_c(56), uint_c(16), uint_c(1));
+ const Vector3< uint_t > cellsPerBlock(domainSize[0] / numBlocks[0], domainSize[1] / numBlocks[1],
+ domainSize[2] / numBlocks[2]);
+
+ // create block grid
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ blockforest::createUniformBlockGrid(numBlocks[0], numBlocks[1], numBlocks[2], // blocks
+ cellsPerBlock[0], cellsPerBlock[1], cellsPerBlock[2], // cells
+ real_c(1.0), // dx
+ true, // one block per process
+ true, false, false, // periodicity
+ true); // global info
+
+ // add fill level field
+ BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill levels", real_c(1.0), field::fzyx, uint_c(1));
+
+ const real_t xQuarter = real_c(domainSize[0]) / real_c(4);
+ const real_t yHalf = real_c(domainSize[1]) / real_c(2);
+
+ // add sphere in the left half (in x-direction) of the domain
+ bubble_model::addBodyToFillLevelField(
+ *blockForest, fillFieldID,
+ geometry::Sphere(Vector3< real_t >(real_c(0.75) * xQuarter, yHalf, real_c(0)), xQuarter * real_c(0.25)), true);
+
+ // add sphere in the center of the domain (across blockForest)
+ bubble_model::addBodyToFillLevelField(
+ *blockForest, fillFieldID,
+ geometry::Sphere(Vector3< real_t >(real_c(domainSize[0]) * real_c(0.5), yHalf, real_c(0)), yHalf), true);
+
+ // add sphere in the right half (in x-direction) of the domain
+ bubble_model::addBodyToFillLevelField(
+ *blockForest, fillFieldID,
+ geometry::Sphere(Vector3< real_t >(real_c(3.25) * xQuarter, yHalf, real_c(0)), xQuarter * real_c(0.25)), true);
+
+ // create bubble model
+ BubbleModelTest< Stencil_T > bubbleModel(blockForest);
+ bubbleModel.initFromFillLevelField(fillFieldID);
+
+ // test correctness of bubble volumes (bubble IDs were determined empirically for this test)
+ // left bubble
+ WALBERLA_CHECK_LESS(
+ std::abs(bubbleModel.getBubbleInitVolume(2) - (xQuarter * real_c(0.25) * xQuarter * real_c(0.25) * math::pi)),
+ real_c(1.07));
+
+ // center bubble
+ WALBERLA_CHECK_LESS(std::abs(bubbleModel.getBubbleInitVolume(0) - (yHalf * yHalf * math::pi)), real_c(1.12));
+
+ // right bubble
+ WALBERLA_CHECK_LESS(
+ std::abs(bubbleModel.getBubbleInitVolume(1) - (xQuarter * real_c(0.25) * xQuarter * real_c(0.25) * math::pi)),
+ real_c(1.07));
+
+ MPIManager::instance()->resetMPI();
+}
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+
+ auto mpiManager = MPIManager::instance();
+
+ WALBERLA_CHECK_EQUAL(mpiManager->numProcesses(), 2);
+
+ WALBERLA_LOG_INFO_ON_ROOT("Testing with D2Q9 stencil.");
+ testBubbleInitialization< stencil::D2Q9 >();
+
+ WALBERLA_LOG_INFO_ON_ROOT("Testing with D3Q19 stencil.");
+ testBubbleInitialization< stencil::D3Q19 >();
+
+ WALBERLA_LOG_INFO_ON_ROOT("Testing with D3Q27 stencil.");
+ testBubbleInitialization< stencil::D3Q27 >();
+
+ return EXIT_SUCCESS;
+}
+
+} // namespace BubbleInitializationTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::BubbleInitializationTest::main(argc, argv); }
\ No newline at end of file
diff --git a/tests/lbm/free_surface/bubble_model/BubbleModelTester.h b/tests/lbm/free_surface/bubble_model/BubbleModelTester.h
new file mode 100644
index 0000000000000000000000000000000000000000..f70d7147696bed18eef2f98bb8361bdecbe4da0a
--- /dev/null
+++ b/tests/lbm/free_surface/bubble_model/BubbleModelTester.h
@@ -0,0 +1,96 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file BubbleModelTester.h
+//! \ingroup lbm/free_surface/bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Helper class for bubble model test cases.
+//!
+//! Provides a source and destination field for fill levels and flags. A derived class is supposed to work on the
+//! destination fields. This (base) class then updates the bubble model and converts cells with respect to any changes
+//! in the destination fields.
+//
+//======================================================================================================================
+
+#pragma once
+
+#include "core/math/Vector3.h"
+
+#include "field/FlagField.h"
+#include "field/GhostLayerField.h"
+
+#include "lbm/free_surface/bubble_model/BubbleModel.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+template< typename Stencil_T >
+class BubbleModelTester
+{
+ public:
+ // define fields
+ using flag_t = uint32_t;
+ using FlagField_T = FlagField< flag_t >;
+ using ScalarField_T = GhostLayerField< real_t, 1 >;
+
+ BubbleModelTester(const std::shared_ptr< StructuredBlockStorage >& blockStorage,
+ const std::shared_ptr< BubbleModel< Stencil_T > >& bubbleModel);
+ virtual ~BubbleModelTester() = default;
+
+ // swap source and destination fill level fields;
+ // swap source and destination flag fields;
+ // update bubble model;
+ // update destination fields;
+ virtual void operator()();
+
+ inline ConstBlockDataID getFlagFieldID() const { return srcFlagFieldID_; }
+ inline ConstBlockDataID getFillLevelFieldID() const { return srcFillLevelFieldID_; }
+
+ private:
+ // report cell conversions from liquid to interface;
+ // report changes in the fill level (destination fill level - source fill level);
+ // report cell conversions from interface to liquid;
+ // check interface layer for correctness
+ void updateBubbleModel();
+
+ protected:
+ virtual void updateDestinationFields() = 0;
+
+ // initialize flag field from fill level
+ void srcFlagsFromSrcFills();
+ void dstFlagsFromDstFills();
+
+ std::shared_ptr< StructuredBlockStorage > blockStorage_;
+ std::shared_ptr< BubbleModel< Stencil_T > > bubbleModel_;
+
+ uint32_t liquidFlag_;
+ uint32_t gasFlag_;
+ uint32_t interfaceFlag_;
+
+ BlockDataID srcFlagFieldID_;
+ BlockDataID dstFlagFieldID_;
+ BlockDataID srcFillLevelFieldID_;
+ BlockDataID dstFillLevelFieldID_;
+};
+
+} // namespace bubble_model
+} // namespace free_surface
+} // namespace walberla
+
+#include "BubbleModelTester.impl.h"
\ No newline at end of file
diff --git a/tests/lbm/free_surface/bubble_model/BubbleModelTester.impl.h b/tests/lbm/free_surface/bubble_model/BubbleModelTester.impl.h
new file mode 100644
index 0000000000000000000000000000000000000000..230655c16e475d6dd624420fed9781eff54123a3
--- /dev/null
+++ b/tests/lbm/free_surface/bubble_model/BubbleModelTester.impl.h
@@ -0,0 +1,160 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file BubbleModelTester.impl.h
+//! \ingroup lbm/free_surface/bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//
+//======================================================================================================================
+
+#include "field/AddToStorage.h"
+
+#include "lbm/free_surface/bubble_model/Geometry.h"
+
+#include "BubbleModelTester.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+template< typename Stencil_T >
+BubbleModelTester< Stencil_T >::BubbleModelTester(const std::shared_ptr< StructuredBlockStorage >& blockStorage,
+ const std::shared_ptr< BubbleModel< Stencil_T > >& bubbleModel)
+ : blockStorage_(blockStorage), bubbleModel_(bubbleModel)
+{
+ // add flag fields
+ srcFlagFieldID_ = field::addFlagFieldToStorage< FlagField_T >(blockStorage_, "FlagFieldSrc");
+ dstFlagFieldID_ = field::addFlagFieldToStorage< FlagField_T >(blockStorage_, "FlagFieldDst");
+
+ // add fill level fields
+ srcFillLevelFieldID_ =
+ field::addToStorage< ScalarField_T >(blockStorage_, "FillLevelSrc", real_c(1.0), field::fzyx, uint_c(1));
+ dstFillLevelFieldID_ =
+ field::addToStorage< ScalarField_T >(blockStorage_, "FillLevelDst", real_c(1.0), field::fzyx, uint_c(1));
+
+ // register flags
+ for (auto blockIt = blockStorage->begin(); blockIt != blockStorage->end(); ++blockIt)
+ {
+ FlagField_T* const srcFlagField = blockIt->getData< FlagField_T >(srcFlagFieldID_);
+ FlagField_T* const dstFlagField = blockIt->getData< FlagField_T >(dstFlagFieldID_);
+
+ liquidFlag_ = srcFlagField->registerFlag("liquid", uint_c(1));
+ gasFlag_ = srcFlagField->registerFlag("gas", uint_c(2));
+ interfaceFlag_ = srcFlagField->registerFlag("interface", uint_c(3));
+
+ dstFlagField->registerFlag("liquid", uint_c(1));
+ dstFlagField->registerFlag("gas", uint_c(2));
+ dstFlagField->registerFlag("interface", uint_c(3));
+ }
+}
+
+template< typename Stencil_T >
+void BubbleModelTester< Stencil_T >::srcFlagsFromSrcFills()
+{
+ // initialize flag field from fill level
+ for (auto blockIt = blockStorage_->begin(); blockIt != blockStorage_->end(); ++blockIt)
+ {
+ FlagField_T* const srcFlagField = blockIt->getData< FlagField_T >(srcFlagFieldID_);
+ const ScalarField_T* const srcFillLevel = blockIt->getData< const ScalarField_T >(srcFillLevelFieldID_);
+
+ bubble_model::setFlagFieldFromFillLevels(srcFlagField, srcFillLevel, "liquid", "gas", "interface");
+ }
+}
+
+template< typename Stencil_T >
+void BubbleModelTester< Stencil_T >::dstFlagsFromDstFills()
+{
+ // initialize flag field from fill level
+ for (auto blockIt = blockStorage_->begin(); blockIt != blockStorage_->end(); ++blockIt)
+ {
+ FlagField_T* const dstFlagField = blockIt->getData< FlagField_T >(dstFlagFieldID_);
+ const ScalarField_T* const dstFillLevel = blockIt->getData< const ScalarField_T >(dstFillLevelFieldID_);
+
+ bubble_model::setFlagFieldFromFillLevels(dstFlagField, dstFillLevel, "liquid", "gas", "interface");
+ }
+}
+
+template< typename Stencil_T >
+void BubbleModelTester< Stencil_T >::operator()()
+{
+ // swap source and destination fill level fields, and flag fields
+ for (auto blockIt = blockStorage_->begin(); blockIt != blockStorage_->end(); ++blockIt)
+ {
+ ScalarField_T* const srcFillLevel = blockIt->getData< ScalarField_T >(srcFillLevelFieldID_);
+ ScalarField_T* const dstFillLevel = blockIt->getData< ScalarField_T >(dstFillLevelFieldID_);
+
+ FlagField_T* const srcFlagField = blockIt->getData< FlagField_T >(srcFlagFieldID_);
+ FlagField_T* const dstFlagField = blockIt->getData< FlagField_T >(dstFlagFieldID_);
+
+ srcFlagField->swapDataPointers(*dstFlagField);
+ srcFillLevel->swapDataPointers(*dstFillLevel);
+ }
+
+ updateDestinationFields();
+ updateBubbleModel();
+}
+
+template< typename Stencil_T >
+void BubbleModelTester< Stencil_T >::updateBubbleModel()
+{
+ for (auto blockIt = blockStorage_->begin(); blockIt != blockStorage_->end(); ++blockIt)
+ {
+ IBlock* thisBlock = &(*blockIt);
+
+ ScalarField_T* const srcFillLevel = blockIt->getData< ScalarField_T >(srcFillLevelFieldID_);
+ ScalarField_T* const dstFillLevel = blockIt->getData< ScalarField_T >(dstFillLevelFieldID_);
+ WALBERLA_ASSERT(srcFillLevel->hasSameSize(*dstFillLevel));
+ WALBERLA_ASSERT_EQUAL_2(srcFillLevel->xyzSize(), dstFillLevel->xyzSize());
+
+ FlagField_T* const srcFlagField = blockIt->getData< FlagField_T >(srcFlagFieldID_);
+ FlagField_T* const dstFlagField = blockIt->getData< FlagField_T >(dstFlagFieldID_);
+ WALBERLA_ASSERT_EQUAL_2(srcFlagField->xyzSize(), dstFlagField->xyzSize());
+
+ WALBERLA_ASSERT_EQUAL_2(srcFlagField->xyzSize(), srcFillLevel->xyzSize());
+
+ // report cell conversion from liquid to interface; explicitly avoid OpenMP when setting bubble IDs
+ WALBERLA_FOR_ALL_CELLS_OMP(srcFlagFieldIt, srcFlagField, dstFlagFieldIt, dstFlagField, omp critical, {
+ if (isFlagSet(srcFlagFieldIt, liquidFlag_) && isFlagSet(dstFlagFieldIt, interfaceFlag_))
+ {
+ bubbleModel_->reportLiquidToInterfaceConversion(thisBlock, srcFlagFieldIt.cell());
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_OMP
+
+ // report changes in the fill level
+ WALBERLA_FOR_ALL_CELLS_OMP(
+ srcFlagFieldIt, srcFlagField, dstFlagFieldIt, dstFlagField, srcFillIt, srcFillLevel, dstFillIt, dstFillLevel,
+ omp critical, {
+ if (isFlagSet(srcFlagFieldIt, interfaceFlag_) || isFlagSet(dstFlagFieldIt, interfaceFlag_))
+ {
+ bubbleModel_->reportFillLevelChange(thisBlock, srcFillIt.cell(), *dstFillIt - *srcFillIt);
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_OMP
+
+ // report cell conversion from interface to liquid
+ WALBERLA_FOR_ALL_CELLS_OMP(srcFlagFieldIt, srcFlagField, dstFlagFieldIt, dstFlagField, omp critical, {
+ if (isFlagSet(srcFlagFieldIt, interfaceFlag_) && isFlagSet(dstFlagFieldIt, liquidFlag_))
+ {
+ bubbleModel_->reportInterfaceToLiquidConversion(thisBlock, srcFlagFieldIt.cell());
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_OMP
+ }
+}
+
+} // namespace bubble_model
+} // namespace free_surface
+} // namespace walberla
diff --git a/tests/lbm/free_surface/bubble_model/MergeAndSplitTest.cpp b/tests/lbm/free_surface/bubble_model/MergeAndSplitTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..b9dab07637351533d04a823070ddbe659721d0be
--- /dev/null
+++ b/tests/lbm/free_surface/bubble_model/MergeAndSplitTest.cpp
@@ -0,0 +1,230 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file MergeAndSplitTest.cpp
+//! \ingroup lbm/free_surface/bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Test bubble merging and splitting in a complex multi-process scenario.
+//!
+//! Initialize the fill levels, flags and bubble model from image MergeAndSplitTestUnconnected.png. This sets up a
+//! complex scenario of 12 bubbles that are located on 10 processes. Bubble merging is tested by loading image
+//! MergeAndSplitTestConnected.png. By loading the initial image in a second time step, bubble splitting is tested.
+//
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+#include "core/mpi/MPIManager.h"
+
+#include "geometry/initializer/ScalarFieldFromGrayScaleImage.h"
+#include "geometry/structured/GrayScaleImage.h"
+
+#include "lbm/free_surface/bubble_model/BubbleModel.h"
+
+#include "stencil/D2Q9.h"
+#include "stencil/D3Q19.h"
+#include "stencil/D3Q27.h"
+
+#include "timeloop/SweepTimeloop.h"
+
+#include <vector>
+
+#include "BubbleModelTester.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace MergeAndSplitTest
+{
+// class derived from BubbleModel to access its protected members for testing purposes
+template< typename Stencil_T >
+class BubbleModelTest : public bubble_model::BubbleModel< Stencil_T >
+{
+ public:
+ BubbleModelTest(const std::shared_ptr< StructuredBlockForest >& blockStorage)
+ : bubble_model::BubbleModel< Stencil_T >(blockStorage, true)
+ {}
+
+ static void testComplexMerge();
+}; // class BubbleModelTest
+
+// initialize and update a source and destination field for fill levels and flags from images; in an alternating manner,
+// update the fields such that the bubble model must either handle bubble merging or splitting on every second call
+template< typename Stencil_T >
+class ImageMover : public bubble_model::BubbleModelTester< Stencil_T >
+{
+ public:
+ ImageMover(const std::shared_ptr< StructuredBlockStorage >& blockStorage,
+ const std::shared_ptr< bubble_model::BubbleModel< Stencil_T > >& bubbleModel)
+ : bubble_model::BubbleModelTester< Stencil_T >(blockStorage, bubbleModel),
+ imgInitializerSrc_(*blockStorage, bubble_model::BubbleModelTester< Stencil_T >::srcFillLevelFieldID_),
+ imgInitializerDst_(*blockStorage, bubble_model::BubbleModelTester< Stencil_T >::dstFillLevelFieldID_),
+ calls_(uint_c(0))
+ {
+ // load image of test scenario with bubbles that are not connected
+ geometry::GrayScaleImage img("MergeAndSplitTestUnconnected.png");
+
+ // initialize fill level field from image
+ imgInitializerSrc_.init(img, 2, false);
+ imgInitializerDst_.init(img, 2, false);
+
+ // initialize flag field
+ bubble_model::BubbleModelTester< Stencil_T >::srcFlagsFromSrcFills();
+ bubble_model::BubbleModelTester< Stencil_T >::dstFlagsFromDstFills();
+
+ // initialize bubble model
+ bubble_model::BubbleModelTester< Stencil_T >::bubbleModel_->initFromFillLevelField(
+ bubble_model::BubbleModelTester< Stencil_T >::dstFillLevelFieldID_);
+ }
+
+ // in an alternating manner, update fill levels such that the bubbles must either merge or split on every second call
+ void updateDestinationFields() override
+ {
+ // load image of test scenario with bubbles that are not connected
+ geometry::GrayScaleImage unconnected("MergeAndSplitTestUnconnected.png");
+
+ // load image of test scenario with bubbles that are connected
+ geometry::GrayScaleImage connected("MergeAndSplitTestConnected.png");
+
+ if (uint_c(calls_) % uint_c(2) == uint_c(0))
+ {
+ // bubbles must merge (destination field is updated to be connected)
+ imgInitializerSrc_.init(unconnected, 2, false);
+ imgInitializerDst_.init(connected, 2, false);
+ }
+ else
+ {
+ // bubbles must split (destination field is updated to be unconnected)
+ imgInitializerSrc_.init(connected, 2, false);
+ imgInitializerDst_.init(unconnected, 2, false);
+ }
+
+ // update flag field
+ bubble_model::BubbleModelTester< Stencil_T >::srcFlagsFromSrcFills();
+ bubble_model::BubbleModelTester< Stencil_T >::dstFlagsFromDstFills();
+
+ ++calls_;
+ }
+
+ private:
+ geometry::initializer::ScalarFieldFromGrayScaleImage imgInitializerSrc_;
+ geometry::initializer::ScalarFieldFromGrayScaleImage imgInitializerDst_;
+ uint_t calls_;
+}; // class ImageMover
+
+template< typename Stencil_T >
+void BubbleModelTest< Stencil_T >::testComplexMerge()
+{
+ auto mpiManager = MPIManager::instance();
+
+ WALBERLA_CHECK_EQUAL(mpiManager->numProcesses(), 10);
+
+ // define the domain size
+ const Vector3< uint_t > numBlocks(uint_c(2), uint_c(5), uint_c(1));
+ const Vector3< uint_t > domainSize(uint_c(100), uint_c(200), uint_c(1));
+ const Vector3< uint_t > cellsPerBlock(domainSize[0] / numBlocks[0], domainSize[1] / numBlocks[1],
+ domainSize[2] / numBlocks[2]);
+
+ // create block grid
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ blockforest::createUniformBlockGrid(numBlocks[0], numBlocks[1], numBlocks[2], // blocks
+ cellsPerBlock[0], cellsPerBlock[1], cellsPerBlock[2], // cells
+ real_c(1.0), // dx
+ true, // one block per process
+ true, false, false); // periodicity
+
+ // create bubble model
+ std::shared_ptr< BubbleModelTest > bubbleModel = std::make_shared< BubbleModelTest >(blockForest);
+
+ // create imageMover that initializes the fill level field, and bubble model; updates the fill level field in an
+ // alternating manner, such that bubbles must either merge or split on every second call
+ ImageMover< Stencil_T > imageMover(blockForest, bubbleModel);
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, uint_c(10));
+
+ // add imageMover to timeloop
+ timeloop.addFuncBeforeTimeStep(imageMover, "UpdateDomainFromImage");
+
+ // update bubble model in timeloop
+ timeloop.addFuncAfterTimeStep(std::bind(&bubble_model::BubbleModel< Stencil_T >::update, bubbleModel));
+
+ // ensure correctness of initialization (number of bubbles)
+ WALBERLA_CHECK_EQUAL(bubbleModel->getBubbles().size(), 12);
+
+ // compute total volume of all bubbles
+ real_t volumeBefore = real_c(0);
+ for (auto b = bubbleModel->getBubbles().begin(); b != bubbleModel->getBubbles().end(); ++b)
+ {
+ volumeBefore += b->getCurrentVolume();
+ }
+
+ // ensure correctness of initialization (total volume of all bubbles)
+ WALBERLA_CHECK_LESS(std::abs(volumeBefore - real_c(8905.51)), 0.1);
+
+ // merge bubbles
+ timeloop.singleStep();
+
+ // there must be a single bubble in the system
+ WALBERLA_CHECK_EQUAL(bubbleModel->getBubbles().size(), 1);
+
+ // the total volume of this single bubble must be slightly larger than the initial volume of all bubbles
+ real_t volumeAfter = bubbleModel->getBubbles()[0].getCurrentVolume();
+ WALBERLA_CHECK_LESS(std::abs(volumeAfter - real_c(8918.41)), 0.1);
+
+ // split bubbles
+ timeloop.singleStep();
+
+ // the number of bubbles must be as before merging
+ WALBERLA_CHECK_EQUAL(bubbleModel->getBubbles().size(), 12);
+
+ // compute total volume of all bubbles
+ real_t volumeAfterSplit = real_c(0);
+ for (auto b = bubbleModel->getBubbles().begin(); b != bubbleModel->getBubbles().end(); ++b)
+ {
+ volumeAfterSplit += b->getCurrentVolume();
+ }
+
+ // the total volume of all bubbles must be as before merging
+ WALBERLA_CHECK_LESS(std::abs(volumeAfterSplit - real_c(8905.51)), 0.1);
+
+ MPIManager::instance()->resetMPI();
+}
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+
+ WALBERLA_LOG_INFO_ON_ROOT("Testing with D2Q9 stencil.");
+ BubbleModelTest< stencil::D2Q9 >::testComplexMerge();
+
+ WALBERLA_LOG_INFO_ON_ROOT("Testing with D3Q19 stencil.");
+ BubbleModelTest< stencil::D3Q19 >::testComplexMerge();
+
+ WALBERLA_LOG_INFO_ON_ROOT("Testing with D3Q27 stencil.");
+ BubbleModelTest< stencil::D3Q27 >::testComplexMerge();
+
+ return EXIT_SUCCESS;
+}
+} // namespace MergeAndSplitTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::MergeAndSplitTest::main(argc, argv); }
\ No newline at end of file
diff --git a/tests/lbm/free_surface/bubble_model/MergeAndSplitTestConnected.png b/tests/lbm/free_surface/bubble_model/MergeAndSplitTestConnected.png
new file mode 100644
index 0000000000000000000000000000000000000000..08b183c1a3e0cef8d84530859474d78a135ef764
Binary files /dev/null and b/tests/lbm/free_surface/bubble_model/MergeAndSplitTestConnected.png differ
diff --git a/tests/lbm/free_surface/bubble_model/MergeAndSplitTestUnconnected.png b/tests/lbm/free_surface/bubble_model/MergeAndSplitTestUnconnected.png
new file mode 100644
index 0000000000000000000000000000000000000000..0e6039cdcffe6832eb04643fd830b6c8fd3bb7a6
Binary files /dev/null and b/tests/lbm/free_surface/bubble_model/MergeAndSplitTestUnconnected.png differ
diff --git a/tests/lbm/free_surface/bubble_model/MergeInformationTest.cpp b/tests/lbm/free_surface/bubble_model/MergeInformationTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..84e559b610e90ce9cc353453fc577cc77ba9a560
--- /dev/null
+++ b/tests/lbm/free_surface/bubble_model/MergeInformationTest.cpp
@@ -0,0 +1,231 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file MergeInformationTest.cpp
+//! \ingroup lbm/free_surface/bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Test bubble merge and reordering, merge registering, and merge communication.
+//
+//======================================================================================================================
+
+#include "lbm/free_surface/bubble_model/MergeInformation.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+#include "core/logging/Logging.h"
+#include "core/mpi/MPIManager.h"
+
+#include <iostream>
+#include <vector>
+
+namespace std
+{
+// overload std::cout for printing vector content
+template< typename T >
+std::ostream& operator<<(std::ostream& os, const std::vector< T >& vec)
+{
+ os << "Vector (" << vec.size() << "): ";
+ for (auto i = vec.begin(); i != vec.end(); ++i)
+ {
+ os << *i << " ";
+ }
+ os << std::endl;
+
+ return os;
+}
+} // namespace std
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace bubble_model
+{
+// test if renameVec_ and vecCompare are equal
+void checkRenameVec(const bubble_model::MergeInformation& mi, const std::vector< bubble_model::BubbleID >& vecCompare)
+{
+ // renameVec_ and vecCompare must have the same size
+ WALBERLA_ASSERT_EQUAL(mi.renameVec_.size(), vecCompare.size());
+
+ bool equal = true;
+ for (size_t i = 0; i < mi.renameVec_.size(); ++i)
+ if (mi.renameVec_[i] != vecCompare[i])
+ {
+ equal = false;
+ break;
+ }
+
+ WALBERLA_CRITICAL_SECTION_START
+ if (!equal)
+ {
+ WALBERLA_LOG_WARNING("Process " << MPIManager::instance()->rank()
+ << ": rename vector different than expected result.\n"
+ << "\tExpected:\n"
+ << "\t\t" << vecCompare << "\tResult:\n"
+ << "\t\t" << mi.renameVec_);
+ }
+ WALBERLA_CRITICAL_SECTION_END
+
+ WALBERLA_CHECK(equal);
+}
+} // namespace bubble_model
+
+namespace MergeInformationTest
+{
+void mergeAndReorderTest1()
+{
+ std::vector< bubble_model::Bubble > bubbles;
+ bubbles.emplace_back(real_c(10)); // BubbleID 0
+ bubbles.emplace_back(bubble_model::Bubble(real_c(11))); // BubbleID 1
+ bubbles.emplace_back(bubble_model::Bubble(real_c(12))); // BubbleID 2
+ bubbles.emplace_back(bubble_model::Bubble(real_c(13))); // BubbleID 3
+
+ bubble_model::MergeInformation mi(bubbles.size());
+ mi.registerMerge(0, 1);
+
+ // merge bubbles with IDs 0 and 1 to ID 0:
+ // - ID 4 gets assigned ID 1 (highest ID, i.e., last position is copied to free space position 1)
+ // - highest ID is now 3 and bubbles vector must have reduced to size 2
+ mi.mergeAndReorderBubbleVector(bubbles);
+
+ WALBERLA_CHECK_EQUAL(bubbles.size(), 3);
+ WALBERLA_CHECK_FLOAT_EQUAL(bubbles[0].getInitVolume(), real_c(10 + 11));
+ WALBERLA_CHECK_FLOAT_EQUAL(bubbles[1].getInitVolume(), real_c(13));
+ WALBERLA_CHECK_FLOAT_EQUAL(bubbles[2].getInitVolume(), real_c(12));
+}
+
+void mergeAndReorderTest2()
+{
+ std::vector< bubble_model::Bubble > bubbles;
+ bubbles.emplace_back(bubble_model::Bubble(real_c(10))); // BubbleID 0
+ bubbles.emplace_back(bubble_model::Bubble(real_c(11))); // BubbleID 1
+ bubbles.emplace_back(bubble_model::Bubble(real_c(12))); // BubbleID 2
+ bubbles.emplace_back(bubble_model::Bubble(real_c(13))); // BubbleID 3
+ bubbles.emplace_back(bubble_model::Bubble(real_c(14))); // BubbleID 4
+ bubbles.emplace_back(real_c(15)); // BubbleID 5
+
+ bubble_model::MergeInformation mi(bubbles.size());
+ mi.registerMerge(4, 3);
+ mi.registerMerge(3, 2);
+ mi.registerMerge(0, 1);
+
+ // merge bubbles with IDs 4, 3, 2 to ID 2, merge bubbles with IDs 0 and 1 to ID 0:
+ // - ID 5 gets assigned ID 1 (highest ID, i.e., last position is copied to free space position 1)
+ // - highest ID is now 3 and bubbles vector must have reduced to size 2
+ mi.mergeAndReorderBubbleVector(bubbles);
+
+ WALBERLA_CHECK_EQUAL(bubbles.size(), 3);
+ WALBERLA_CHECK_FLOAT_EQUAL(bubbles[0].getInitVolume(), real_c(10 + 11));
+ WALBERLA_CHECK_FLOAT_EQUAL(bubbles[1].getInitVolume(), real_c(15));
+ WALBERLA_CHECK_FLOAT_EQUAL(bubbles[2].getInitVolume(), real_c(12 + 13 + 14));
+}
+
+void mergeRegisterTest()
+{
+ // create new MergeInformation with 6 bubbles
+ bubble_model::MergeInformation mi(6);
+
+ // initial ID distribution
+ std::vector< bubble_model::BubbleID > correctRenameVec = { 0, 1, 2, 3, 4, 5 };
+ checkRenameVec(mi, correctRenameVec);
+
+ // Function registerMerge() only registers the merge by (temporarily) renaming bubble IDs appropriately. Therefore,
+ // in below comments, it is more meaningful to write "position x (in renameVec_) is renamed to the ID at position
+ // y" than "ID x is renamed to ID y".
+
+ // position 5 is renamed to the ID at position 3
+ mi.registerMerge(5, 3);
+ correctRenameVec = { 0, 1, 2, 3, 4, 3 };
+ checkRenameVec(mi, correctRenameVec);
+
+ // position 3 is renamed to the ID at position 1
+ mi.registerMerge(3, 1);
+ correctRenameVec = { 0, 1, 2, 1, 4, 3 };
+ checkRenameVec(mi, correctRenameVec);
+
+ // since position 3 was already renamed to the ID at position 1, registerMerge(1, 0) is called internally and
+ // position 1 is renamed to the ID at position 0; position 3 is renamed to the ID at position 0
+ mi.registerMerge(3, 0);
+ correctRenameVec = { 0, 0, 2, 0, 4, 3 };
+ checkRenameVec(mi, correctRenameVec);
+
+ // since position 5 was already renamed to the ID of position 3, registerMerge(3, 2) is called internally; since
+ // position 3 was already renamed to the ID of position 0, registerMerge(2, 0) is called internally; position 2 is
+ // renamed to the ID at position 0, position 5 is renamed to the ID at position 0
+ mi.registerMerge(5, 2);
+ correctRenameVec = { 0, 0, 0, 0, 4, 0 };
+ checkRenameVec(mi, correctRenameVec);
+}
+
+void mergeCommunicationTest()
+{
+ auto mpiManager = MPIManager::instance();
+
+ // this test is only meaningful with multiple processes
+ if (!mpiManager->isMPIInitialized() || mpiManager->numProcesses() < 3) { return; }
+
+ // create new MergeInformation with 5 bubbles and renameVec_={ 0, 1, 2, 3, 4 }
+ bubble_model::MergeInformation mi(5);
+
+ if (mpiManager->rank() == 0) { mi.registerMerge(1, 0); }
+ else
+ {
+ if (mpiManager->rank() == 1)
+ {
+ mi.registerMerge(3, 2);
+ mi.registerMerge(2, 1);
+ }
+ else
+ {
+ if (mpiManager->rank() == 2) { mi.registerMerge(4, 1); }
+ }
+ }
+
+ // before communication:
+ // process 0: renameVec_={ 0, 0, 2, 3, 4 }
+ // process 1: renameVec_={ 0, 1, 1, 1, 4 }
+ // process 2: renameVec_={ 0, 1, 2, 3, 1 }
+
+ mi.communicateMerges();
+
+ // after communication:
+ // process 0 to 2: renameVec_={ 0, 0, 0, 0, 0 }
+ std::vector< bubble_model::BubbleID > res = { 0, 0, 0, 0, 0 };
+ checkRenameVec(mi, res);
+}
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+
+ // the MPI communicator is normally created with the block forest; we will not use a block forest in this test and
+ // thus choose the MPI communicator manually
+ WALBERLA_MPI_SECTION() { MPIManager::instance()->useWorldComm(); }
+
+ mergeAndReorderTest1();
+ mergeAndReorderTest2();
+
+ mergeRegisterTest();
+ mergeCommunicationTest();
+
+ return EXIT_SUCCESS;
+}
+} // namespace MergeInformationTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::MergeInformationTest::main(argc, argv); }
diff --git a/tests/lbm/free_surface/bubble_model/MovingSpheresTest.cpp b/tests/lbm/free_surface/bubble_model/MovingSpheresTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..36f09079f29978b00fddbffad4b02ab883ea2340
--- /dev/null
+++ b/tests/lbm/free_surface/bubble_model/MovingSpheresTest.cpp
@@ -0,0 +1,173 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file MovingSpheresTest.cpp
+//! \ingroup lbm/free_surface/bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//!
+//! \brief Test volume conservation of moving bubbles, bubble merging and bubble splitting.
+//!
+//! A spherical bubble is moved towards a static spherical bubble in the center of the domain. The bubbles merge and
+//! split again, as the movement of the spherical volume is continued after merging.
+//
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+#include "core/mpi/MPIManager.h"
+
+#include "geometry/bodies/Sphere.h"
+
+#include "lbm/free_surface/bubble_model/BubbleModel.h"
+
+#include "stencil/D2Q9.h"
+#include "stencil/D3Q19.h"
+#include "stencil/D3Q27.h"
+
+#include "timeloop/SweepTimeloop.h"
+
+#include "BubbleBodyMover.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace MovingSpheresTest
+{
+// class derived from BubbleModel to access its protected members for testing purposes
+template< typename Stencil_T >
+class BubbleModelTest : public bubble_model::BubbleModel< Stencil_T >
+{
+ public:
+ BubbleModelTest(const std::shared_ptr< StructuredBlockForest >& blockForest)
+ : bubble_model::BubbleModel< Stencil_T >(blockForest, true)
+ {}
+
+ static void testMovingSpheres();
+}; // class BubbleModelTest
+
+template< typename Stencil_T >
+void BubbleModelTest< Stencil_T >::testMovingSpheres()
+{
+ auto mpiManager = MPIManager::instance();
+
+ WALBERLA_CHECK_EQUAL(mpiManager->numProcesses(), 2);
+
+ // define the domain size
+ const Vector3< uint_t > numBlocks(uint_c(2), uint_c(1), uint_c(1));
+ Vector3< uint_t > domainSize(uint_c(60), uint_c(16), uint_c(16));
+
+ if (Stencil_T::D == uint_c(2)) { domainSize[2] = uint_c(1); }
+
+ const Vector3< uint_t > cellsPerBlock(domainSize[0] / numBlocks[0], domainSize[1] / numBlocks[1],
+ domainSize[2] / numBlocks[2]);
+
+ // create block grid
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ blockforest::createUniformBlockGrid(numBlocks[0], numBlocks[1], numBlocks[2], // blocks
+ cellsPerBlock[0], cellsPerBlock[1], cellsPerBlock[2], // cells
+ real_c(1.0), // dx
+ true, // one block per process
+ true, false, false); // periodicity
+
+ // create bubble model
+ std::shared_ptr< BubbleModelTest > bubbleModel = std::make_shared< BubbleModelTest >(blockForest);
+
+ // create bubble body mover for moving bubbles
+ bubble_model::BubbleBodyMover< geometry::Sphere, Stencil_T > bubbleSphereMover(blockForest, bubbleModel);
+
+ Vector3< real_t > domainCenter(real_c(domainSize[0]) * real_c(0.5), real_c(domainSize[1]) * real_c(0.5),
+ real_c(domainSize[2]) * real_c(0.5));
+
+ // create a static spherical bubble in the center of the domain
+ geometry::Sphere sphereCenter(domainCenter, real_c(5));
+ auto doNotMoveSphere = [](geometry::Sphere&) {};
+ bubbleSphereMover.addBody(sphereCenter, doNotMoveSphere);
+
+ // create a moving spherical bubble in the left (in x-direction) half of the domain
+ geometry::Sphere sphereLeft(Vector3< real_t >(real_c(8.0), domainCenter[1], domainCenter[2]), real_c(5));
+ auto moveSphere = [](geometry::Sphere& sphere) {
+ // midpoint of the sphere is shifted by 1 cell in positive x-direction at each call
+ sphere.setMidpoint(sphere.midpoint() + Vector3< real_t >(real_c(1), real_c(0), real_c(0)));
+ };
+ bubbleSphereMover.addBody(sphereLeft, moveSphere);
+
+ // initialize the just added bubbles
+ bubbleSphereMover.initAddedBodies();
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, uint_c(40));
+ timeloop.addFuncBeforeTimeStep(bubbleSphereMover, "Move bubbles");
+ timeloop.addFuncAfterTimeStep(std::bind(&bubble_model::BubbleModel< Stencil_T >::update, bubbleModel));
+
+ real_t singleBubbleVolume = real_c(523.346);
+
+ if (Stencil_T::D == uint_c(2)) { singleBubbleVolume = real_c(78.1987); }
+
+ uint_t timestep = uint_c(0);
+
+ // at time step 8, there should still be two bubbles
+ for (; timestep < uint_c(8); ++timestep)
+ {
+ timeloop.singleStep();
+ }
+ WALBERLA_CHECK_EQUAL(bubbleModel->getBubbles().size(), 2);
+ WALBERLA_CHECK_LESS(std::abs(bubbleModel->getBubbles()[0].getInitVolume() - singleBubbleVolume), real_c(0.5));
+ WALBERLA_CHECK_LESS(std::abs(bubbleModel->getBubbles()[1].getInitVolume() - singleBubbleVolume), real_c(0.5));
+
+ // at time step 12 the bubbles should have merged
+ for (; timestep < uint_c(12); ++timestep)
+ {
+ timeloop.singleStep();
+ }
+ WALBERLA_CHECK_EQUAL(bubbleModel->getBubbles().size(), 1);
+ WALBERLA_CHECK_LESS(std::abs(bubbleModel->getBubbles()[0].getInitVolume() - 2 * singleBubbleVolume), real_c(0.5));
+
+ // at time step 35 the bubbles should have split again
+ for (; timestep < uint_c(35); ++timestep)
+ {
+ timeloop.singleStep();
+ }
+ WALBERLA_CHECK_EQUAL(bubbleModel->getBubbles().size(), 2);
+ WALBERLA_CHECK_LESS(std::abs(bubbleModel->getBubbles()[0].getInitVolume() - singleBubbleVolume), real_c(0.5));
+ WALBERLA_CHECK_LESS(std::abs(bubbleModel->getBubbles()[1].getInitVolume() - singleBubbleVolume), real_c(0.5));
+
+ MPIManager::instance()->resetMPI();
+}
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+
+ WALBERLA_LOG_INFO_ON_ROOT("Testing with D2Q9 stencil.")
+ BubbleModelTest< stencil::D2Q9 >::testMovingSpheres();
+
+ WALBERLA_LOG_INFO_ON_ROOT("Testing with D3Q19 stencil.")
+ BubbleModelTest< stencil::D3Q19 >::testMovingSpheres();
+
+ WALBERLA_LOG_INFO_ON_ROOT("Testing with D3Q27 stencil.")
+ BubbleModelTest< stencil::D3Q27 >::testMovingSpheres();
+
+ return EXIT_SUCCESS;
+}
+} // namespace MovingSpheresTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::MovingSpheresTest::main(argc, argv); }
\ No newline at end of file
diff --git a/tests/lbm/free_surface/bubble_model/RegionalFloodFillTest.cpp b/tests/lbm/free_surface/bubble_model/RegionalFloodFillTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..6a41cd8e919c401c75c9b1379f4f84c97a58326c
--- /dev/null
+++ b/tests/lbm/free_surface/bubble_model/RegionalFloodFillTest.cpp
@@ -0,0 +1,88 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file RegionalFloodFillTest.cpp
+//! \ingroup lbm/free_surface/bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Test flood fill algorithm with D3Q7 and D3Q19 stencil.
+//
+//======================================================================================================================
+
+#include "lbm/free_surface/bubble_model/RegionalFloodFill.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+
+#include "field/Printers.h"
+
+#include "stencil/D3Q19.h"
+#include "stencil/D3Q7.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace RegionalFloodFillTest
+{
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment walberlaEnv(argc, argv);
+
+ // create 3x3 field with 1 ghost layer (initialized with 0)
+ GhostLayerField< int, 1 > field(3, 3, 1, 1, 0);
+
+ // initial values of the field; the flood fill starting cell is marked with /**/;
+ // attention: the y coordinate is upside down in this array
+ const int initValues[5][5] = {
+ { 1, 1, 1, 1, 1 }, { 0, 0 /**/, 0, 1, 0 }, { 1, 0, 0, 1, 0 }, { 1, 0, 0, 1, 0 }, { 1, 1, 1, 0, 0 },
+ };
+
+ // test scenario: detect the connection from (1,0) and (0,2) with starting cell (0,0)
+ for (cell_idx_t y = cell_idx_c(-1); y < cell_idx_c(4); ++y)
+ {
+ for (cell_idx_t x = cell_idx_c(-1); x < cell_idx_c(4); ++x)
+ {
+ field(x, y, cell_idx_c(0)) = initValues[y + 1][x + 1];
+ }
+ }
+
+ // print the initialized field (for debugging purposes)
+ // std::cout << "Initialized field:" << std::endl;
+ // field::printSlice(std::cout, field, 2, 0);
+
+ // connection should not be found since search neighborhood (2) is too small
+ bubble_model::RegionalFloodFill< int, stencil::D3Q19 > neigh2_D3Q19(
+ &field, Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)), stencil::S, 1, cell_idx_c(2));
+ WALBERLA_CHECK_EQUAL(neigh2_D3Q19.connected(stencil::NW), false);
+
+ // connection should be found since search neighborhood (3) is large enough
+ bubble_model::RegionalFloodFill< int, stencil::D3Q19 > neigh3_D3Q19(
+ &field, Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)), stencil::S, 1, cell_idx_c(3));
+ WALBERLA_CHECK_EQUAL(neigh3_D3Q19.connected(stencil::NW), true);
+
+ // connection should be found since search neighborhood (3) is large enough
+ bubble_model::RegionalFloodFill< int, stencil::D3Q7 > neigh3_D3Q7(
+ &field, Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)), stencil::S, 1, cell_idx_c(3));
+ WALBERLA_CHECK_EQUAL(neigh3_D3Q7.connected(stencil::NW), false);
+
+ return EXIT_SUCCESS;
+}
+} // namespace RegionalFloodFillTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::RegionalFloodFillTest::main(argc, argv); }
\ No newline at end of file
diff --git a/tests/lbm/free_surface/bubble_model/SplitDetectionTest.cpp b/tests/lbm/free_surface/bubble_model/SplitDetectionTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..adfbce45ff63ba2bdf32bcb484e41fd87eb264be
--- /dev/null
+++ b/tests/lbm/free_surface/bubble_model/SplitDetectionTest.cpp
@@ -0,0 +1,152 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file SplitDetectionTest.cpp
+//! \ingroup lbm/free_surface/bubble_model
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Test bubble split detection with 2D and 3D bubbles.
+//
+//======================================================================================================================
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+
+#include "lbm/free_surface/bubble_model/BubbleModel.h"
+
+#include "stencil/D2Q9.h"
+#include "stencil/D3Q19.h"
+#include "stencil/D3Q27.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace SplitDetectionTest
+{
+using namespace bubble_model;
+
+// class derived from BubbleModel to access its protected members for testing purposes
+template< typename Stencil_T >
+class BubbleModelTest : public BubbleModel< Stencil_T >
+{
+ public:
+ static bool checkForSplit(BubbleField_T* bf, const Cell& cell, BubbleID prevID)
+ {
+ return BubbleModel< Stencil_T >::checkForSplit(bf, cell, prevID);
+ }
+}; // class BubbleModelTest
+
+void initSlice(BubbleField_T* bf, cell_idx_t z, const BubbleID array3x3[])
+{
+ for (cell_idx_t y = cell_idx_c(0); y < cell_idx_c(3); ++y)
+ {
+ for (cell_idx_t x = cell_idx_c(0); x < cell_idx_c(3); ++x)
+ {
+ bf->get(x, y, z) = array3x3[3 * (2 - y) + x];
+ }
+ }
+}
+
+void test2D_notConnected()
+{
+ // create a 3x3x3 bubble field (without ghost layer) and initialize with invalid IDs
+ BubbleField_T bubbleField(uint_c(3), uint_c(3), uint_c(3), uint_c(0), INVALID_BUBBLE_ID);
+
+ // initialize a 2D slice of the bubble field (disconnected bubble)
+ const BubbleID N = INVALID_BUBBLE_ID;
+ const BubbleID init[] = { 2, 2, 2, N, N, N, 2, 2, 2 };
+
+ initSlice(&bubbleField, cell_idx_c(1), init);
+
+ WALBERLA_CHECK(BubbleModelTest< stencil::D2Q9 >::checkForSplit(
+ &bubbleField, Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(1)), 2) == true);
+}
+
+void test2D_connected()
+{
+ // create a 3x3x3 bubble field (without ghost layer) and initialize with invalid IDs
+ BubbleField_T bubbleField(uint_c(3), uint_c(3), uint_c(3), uint_c(0), INVALID_BUBBLE_ID);
+
+ // initialize a 2D slice of the bubble field (connected bubble)
+ const BubbleID N = INVALID_BUBBLE_ID;
+ const BubbleID init[] = { 2, 2, 2, 2, N, N, 2, 2, 2 };
+
+ initSlice(&bubbleField, cell_idx_c(1), init);
+
+ WALBERLA_CHECK(BubbleModelTest< stencil::D2Q9 >::checkForSplit(
+ &bubbleField, Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(1)), 2) == false);
+}
+
+void test3D_connected()
+{
+ // create a 3x3x3 bubble field (without ghost layer) and initialize with invalid IDs
+ BubbleField_T bubbleField(uint_c(3), uint_c(3), uint_c(3), uint_c(0), INVALID_BUBBLE_ID);
+
+ // initialize whole bubble field (connected bubble)
+ const BubbleID N = INVALID_BUBBLE_ID;
+ const BubbleID z0[] = { 2, 2, 2, N, N, N, 2, 2, 2 };
+ const BubbleID z1[] = { N, 2, N, N, N, N, N, N, N };
+ const BubbleID z2[] = { N, 2, N, N, 2, N, N, 2, N };
+
+ initSlice(&bubbleField, cell_idx_c(0), z0);
+ initSlice(&bubbleField, cell_idx_c(0), z1);
+ initSlice(&bubbleField, cell_idx_c(0), z2);
+
+ WALBERLA_CHECK(BubbleModelTest< stencil::D3Q19 >::checkForSplit(
+ &bubbleField, Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(1)), 2) == false);
+ WALBERLA_CHECK(BubbleModelTest< stencil::D3Q27 >::checkForSplit(
+ &bubbleField, Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(1)), 2) == false);
+}
+
+void test3D_notConnected()
+{
+ // create a 3x3x3 bubble field (without ghost layer) and initialize with invalid IDs
+ BubbleField_T bubbleField(uint_c(3), uint_c(3), uint_c(3), uint_c(0), INVALID_BUBBLE_ID);
+
+ // initialize whole bubble field (disconnected bubble)
+ const BubbleID N = INVALID_BUBBLE_ID;
+ const BubbleID z0[] = { 2, 2, 2, N, N, N, 2, 2, 2 };
+ const BubbleID z1[] = { N, N, N, N, N, N, N, N, N };
+ const BubbleID z2[] = { N, 2, N, N, 2, N, N, 2, N };
+
+ initSlice(&bubbleField, 0, z0);
+ initSlice(&bubbleField, 1, z1);
+ initSlice(&bubbleField, 2, z2);
+
+ WALBERLA_CHECK(BubbleModelTest< stencil::D3Q19 >::checkForSplit(
+ &bubbleField, Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(1)), 2) == true);
+ WALBERLA_CHECK(BubbleModelTest< stencil::D3Q27 >::checkForSplit(
+ &bubbleField, Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(1)), 2) == true);
+}
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+
+ test2D_notConnected();
+ test2D_connected();
+
+ test3D_connected();
+ test3D_notConnected();
+
+ return EXIT_SUCCESS;
+}
+} // namespace SplitDetectionTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::SplitDetectionTest::main(argc, argv); }
\ No newline at end of file
diff --git a/tests/lbm/free_surface/dynamics/AdvectionTest.cpp b/tests/lbm/free_surface/dynamics/AdvectionTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..1c3acc672ca28f1d5ed59fbf33bee4644a276d06
--- /dev/null
+++ b/tests/lbm/free_surface/dynamics/AdvectionTest.cpp
@@ -0,0 +1,220 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file AdvectionTest.cpp
+//! \ingroup lbm/free_surface/dynamics
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Test mass advection on a flat surface.
+//!
+//! Initialize a pool of liquid in half of the domain and a box-shaped atmosphere (density 1.01) bubble in the remaining
+//! cells. Only the StreamReconstructAdvectSweep is performed. Due to the higher density in the gas, the interface cells
+//! that separate liquid and gas are emptied and their fill level must become negative. These cells must be marked
+//! for conversion and the fluid density must balance the atmosphere density.
+//
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+#include "blockforest/communication/UniformBufferedScheme.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+
+#include "field/AddToStorage.h"
+#include "field/adaptors/AdaptorCreators.h"
+#include "field/communication/PackInfo.h"
+
+#include "lbm/field/Adaptors.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface//FlagInfo.h"
+#include "lbm/free_surface/boundary/FreeSurfaceBoundaryHandling.h"
+#include "lbm/free_surface/dynamics/PdfReconstructionModel.h"
+#include "lbm/free_surface/dynamics/StreamReconstructAdvectSweep.h"
+#include "lbm/lattice_model/CollisionModel.h"
+#include "lbm/lattice_model/D3Q19.h"
+#include "lbm/lattice_model/ForceModel.h"
+#include "lbm/sweeps/CellwiseSweep.h"
+#include "lbm/sweeps/SweepWrappers.h"
+
+#include "timeloop/SweepTimeloop.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace AdvectionTest
+{
+// define types
+using Flag_T = uint32_t;
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+using FlagField_T = FlagField< Flag_T >;
+
+template< typename LatticeModel_T >
+void testAdvection()
+{
+ // define types
+ using Stencil_T = typename LatticeModel_T::Stencil;
+ using PdfField_T = lbm::PdfField< LatticeModel_T >;
+ using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+ // define the domain size
+ const Vector3< uint_t > numBlocks(uint_c(1));
+ const Vector3< uint_t > domainSize(uint_c(3), uint_c(10), uint_c(2));
+ const Vector3< uint_t > cellsPerBlock(domainSize[0] / numBlocks[0], domainSize[1] / numBlocks[1],
+ domainSize[2] / numBlocks[2]);
+
+ // create block grid
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ blockforest::createUniformBlockGrid(numBlocks[0], numBlocks[1], numBlocks[2], // blocks
+ cellsPerBlock[0], cellsPerBlock[1], cellsPerBlock[2], // cells
+ real_c(1.0), // dx
+ true, // one block per process
+ true, false, true); // periodicity
+
+ // create lattice model with omega=0.51
+ LatticeModel_T latticeModel(real_c(0.51));
+
+ // add fields
+ BlockDataID pdfFieldID = lbm::addPdfFieldToStorage(blockForest, "PDF field", latticeModel, field::fzyx);
+ BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill levels", real_c(1.0), field::fzyx, uint_c(1));
+ BlockDataID curvatureFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Curvature", real_c(0.0), field::fzyx, uint_c(1));
+ BlockDataID normalFieldID = field::addToStorage< VectorField_T >(
+ blockForest, "Normals", Vector3< real_t >(real_c(0), real_c(1), real_c(0)), field::fzyx, uint_c(1));
+
+ BlockDataID densityAdaptor = field::addFieldAdaptor< typename lbm::Adaptor< LatticeModel_T >::Density >(
+ blockForest, pdfFieldID, "DensityAdaptor");
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ // add box-shaped gas bubble (occupies about half of the domain in y-direction)
+ AABB box = blockForest->getDomain();
+ auto newMin = box.min() + Vector3< real_t >(real_c(0), real_c(0.5) * box.ySize() + real_c(0.01), real_c(0));
+ box.initMinMaxCorner(newMin, box.max());
+ freeSurfaceBoundaryHandling->addFreeSurfaceObject(box);
+
+ // set no slip boundary conditions at the southern and northern domain borders
+ freeSurfaceBoundaryHandling->setNoSlipAtBorder(stencil::S);
+ freeSurfaceBoundaryHandling->setNoSlipAtBorder(stencil::N);
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+
+ // add bubble model
+ bubble_model::BubbleModel< Stencil_T > bubbleModel(blockForest, false);
+ bubbleModel.initFromFillLevelField(fillFieldID);
+
+ // get some cell located inside the bubble (used as representative cell to set bubble to atmosphere bubble type)
+ Cell cellInBubble;
+ cellInBubble.x() = cell_idx_c(box.xMin() + real_c(0.5) * box.xSize());
+ cellInBubble.y() = cell_idx_c(box.yMin() + real_c(0.5) * box.ySize());
+ cellInBubble.z() = cell_idx_c(box.zMin() + real_c(0.5) * box.zSize());
+
+ // set bubble to atmosphere with constant density higher than the initial fluid density
+ const real_t atmDensity = real_c(1.01);
+ bubbleModel.setAtmosphere(cellInBubble, atmDensity);
+
+ // create timeloop; 300 time steps are required (for very low omega of 0.51) to ensure that fluid density has
+ // stabilized
+ SweepTimeloop timeloop(blockForest, uint_c(300));
+
+ // add communication
+ blockforest::communication::UniformBufferedScheme< typename LatticeModel_T::Stencil > comm(blockForest);
+ comm.addPackInfo(std::make_shared< field::communication::PackInfo< PdfField_T > >(pdfFieldID));
+ comm.addPackInfo(std::make_shared< field::communication::PackInfo< ScalarField_T > >(fillFieldID));
+ comm.addPackInfo(
+ std::make_shared< field::communication::PackInfo< FlagField_T > >(freeSurfaceBoundaryHandling->getFlagFieldID()));
+
+ // communicate
+ comm();
+
+ const PdfReconstructionModel pdfRecModel = PdfReconstructionModel("NormalBasedKeepCenter");
+
+ // add free surface boundary sweep for
+ // - reconstruction of PDFs in interface cells
+ // - advection of mass
+ // - marking interface cells for conversion
+ // - update bubble volumes
+ StreamReconstructAdvectSweep< LatticeModel_T, typename FreeSurfaceBoundaryHandling_T::BoundaryHandling_T,
+ FlagField_T, typename FreeSurfaceBoundaryHandling_T::FlagInfo_T, ScalarField_T,
+ VectorField_T, false >
+ streamReconstructAdvectSweep(real_c(0), freeSurfaceBoundaryHandling->getHandlingID(), fillFieldID,
+ freeSurfaceBoundaryHandling->getFlagFieldID(), pdfFieldID, normalFieldID,
+ curvatureFieldID, flagInfo, &bubbleModel, pdfRecModel, false, real_c(1e-3),
+ real_c(1e-1));
+ timeloop.add() << Sweep(streamReconstructAdvectSweep);
+
+ // add boundary handling sweep
+ timeloop.add() << BeforeFunction(comm) << Sweep(freeSurfaceBoundaryHandling->getBoundarySweep());
+
+ // add LBM collision sweep
+ auto lbmSweep = lbm::makeCellwiseSweep< LatticeModel_T, FlagField_T >(
+ pdfFieldID, freeSurfaceBoundaryHandling->getFlagFieldID(), flagIDs::liquidInterfaceFlagIDs);
+ timeloop.add() << Sweep(lbm::makeCollideSweep(lbmSweep));
+
+ timeloop.run();
+
+ // evaluate
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ const ScalarField_T* const fillField = blockIt->getData< const ScalarField_T >(fillFieldID);
+ const typename lbm::Adaptor< LatticeModel_T >::Density* const densityField =
+ blockIt->getData< const typename lbm::Adaptor< LatticeModel_T >::Density >(densityAdaptor);
+ const FlagField_T* const flagField =
+ blockIt->getData< const FlagField_T >(freeSurfaceBoundaryHandling->getFlagFieldID());
+
+ WALBERLA_FOR_ALL_CELLS(fillFieldIt, fillField, densityFieldIt, densityField, flagFieldIt, flagField, {
+ if (flagInfo.isInterface(flagFieldIt))
+ {
+ // fill level in interface cells must be negative
+ WALBERLA_CHECK_LESS(*fillFieldIt, real_c(0));
+
+ // due to negative fill level, these cells must be marked for conversion to gas
+ WALBERLA_CHECK(isFlagSet(flagFieldIt, flagInfo.convertToGasFlag));
+ }
+
+ // in the absence of forces, fluid density must balance atmosphere density
+ if (flagInfo.isLiquid(flagFieldIt)) { WALBERLA_CHECK_FLOAT_EQUAL(*densityFieldIt, atmDensity); }
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ MPIManager::instance()->resetMPI();
+}
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+
+ WALBERLA_LOG_INFO("Testing with D2Q9 stencil.");
+ testAdvection< lbm::D2Q9< lbm::collision_model::SRT, true, lbm::force_model::None, 2 > >();
+
+ WALBERLA_LOG_INFO("Testing with D3Q19 stencil.");
+ testAdvection< lbm::D3Q19< lbm::collision_model::SRT, true, lbm::force_model::None, 2 > >();
+
+ WALBERLA_LOG_INFO("Testing with D3Q27 stencil.");
+ testAdvection< lbm::D3Q27< lbm::collision_model::SRT, true, lbm::force_model::None, 2 > >();
+
+ return EXIT_SUCCESS;
+}
+
+} // namespace AdvectionTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::AdvectionTest::main(argc, argv); }
\ No newline at end of file
diff --git a/tests/lbm/free_surface/dynamics/CellConversionTest.cpp b/tests/lbm/free_surface/dynamics/CellConversionTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..6f7645c8437ae6de25eb5e4a51defa3385aac3e4
--- /dev/null
+++ b/tests/lbm/free_surface/dynamics/CellConversionTest.cpp
@@ -0,0 +1,280 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file CellConversionTest.cpp
+//! \ingroup lbm/free_surface/dynamics
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Test cell conversions on a flat surface by checking mass conservation and density balance.
+//!
+//! Initialize a pool of liquid in half of the domain and a box-shaped atmosphere (density 1.1) bubble in the remaining
+//! cells. All sweeps from SurfaceDynamicsHandler are performed. Due to the higher density in the gas, the interface
+//! cells that separate liquid and gas are emptied and their fill level must become negative. These cells are converted
+//! to liquid, while former fluid cells must become interface cells. After this process, mass must be conserved and the
+//! fluid density must balance the atmosphere density.
+//
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+#include "blockforest/communication/UniformBufferedScheme.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+
+#include "field/AddToStorage.h"
+#include "field/communication/PackInfo.h"
+
+#include "lbm/field/Adaptors.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface/FlagInfo.h"
+#include "lbm/free_surface/boundary/FreeSurfaceBoundaryHandling.h"
+#include "lbm/free_surface/dynamics/SurfaceDynamicsHandler.h"
+#include "lbm/lattice_model/CollisionModel.h"
+#include "lbm/lattice_model/D3Q19.h"
+#include "lbm/lattice_model/ForceModel.h"
+
+#include "timeloop/SweepTimeloop.h"
+
+#include <limits>
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace CellConversionTest
+{
+// define types
+using flag_t = uint32_t;
+
+// define fields
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+using FlagField_T = FlagField< flag_t >;
+
+// compute the total mass of the fluid (in all interface and liquid cells)
+template< typename LatticeModel_T, typename FlagField_T >
+real_t computeTotalMass(
+ const std::weak_ptr< StructuredBlockForest >& blockForest, ConstBlockDataID pdfField, ConstBlockDataID fillField,
+ ConstBlockDataID flagField,
+ const typename FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::FlagInfo_T& flags);
+
+// compute the minimum and maximum density in all interface and liquid cells
+template< typename LatticeModel_T, typename FlagField_T >
+void computeMinMaxDensity(
+ const std::weak_ptr< StructuredBlockForest >& blockForest, ConstBlockDataID pdfField, ConstBlockDataID flagField,
+ const typename FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::FlagInfo_T& flags,
+ real_t& minDensity, real_t& maxDensity);
+
+template< typename LatticeModel_T >
+void testCellConversion()
+{
+ // define types
+ using Stencil_T = typename LatticeModel_T::Stencil;
+ using PdfField_T = lbm::PdfField< LatticeModel_T >;
+
+ using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+ // define the domain size
+ const Vector3< uint_t > numBlocks(uint_c(1));
+ const Vector3< uint_t > domainSize(uint_c(3), uint_c(10), uint_c(2));
+ const Vector3< uint_t > cellsPerBlock(domainSize[0] / numBlocks[0], domainSize[1] / numBlocks[1],
+ domainSize[2] / numBlocks[2]);
+
+ // create block grid
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ blockforest::createUniformBlockGrid(numBlocks[0], numBlocks[1], numBlocks[2], // blocks
+ cellsPerBlock[0], cellsPerBlock[1], cellsPerBlock[2], // cells
+ real_c(1.0), // dx
+ true, // one block per process
+ true, false, true); // periodicity
+
+ real_t relaxRate = real_c(0.51);
+
+ // create lattice model with omega=0.51
+ LatticeModel_T latticeModel(relaxRate);
+
+ // add fields
+ BlockDataID pdfFieldID = lbm::addPdfFieldToStorage(blockForest, "PDF field", latticeModel, field::fzyx);
+ BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill levels", real_c(1.0), field::fzyx, uint_c(1));
+ BlockDataID forceFieldID = field::addToStorage< VectorField_T >(
+ blockForest, "Force field", Vector3< real_t >(real_c(0)), field::fzyx, uint_c(1));
+ BlockDataID curvatureFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Curvature", real_c(0.0), field::fzyx, uint_c(1));
+ BlockDataID normalFieldID = field::addToStorage< VectorField_T >(
+ blockForest, "Normals", Vector3< real_t >(real_c(0), real_c(1), real_c(0)), field::fzyx, uint_c(1));
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ // add box-shaped gas bubble (occupies about half of the domain in y-direction)
+ AABB box = blockForest->getDomain();
+ auto newMin = box.min() + Vector3< real_t >(real_c(0), real_c(0.5) * box.ySize() + real_c(1 - 0.02), real_c(0));
+ box.initMinMaxCorner(newMin, box.max());
+ freeSurfaceBoundaryHandling->addFreeSurfaceObject(box);
+
+ // set no slip boundary conditions at the southern and northern domain borders
+ freeSurfaceBoundaryHandling->setNoSlipAtBorder(stencil::S);
+ freeSurfaceBoundaryHandling->setNoSlipAtBorder(stencil::N);
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+
+ // add bubble model
+ auto bubbleModel = std::make_shared< bubble_model::BubbleModel< Stencil_T > >(blockForest, false);
+ bubbleModel->initFromFillLevelField(fillFieldID);
+
+ // get some cell located inside the bubble (used as representative cell to set bubble to atmosphere bubble type)
+ Cell cellInBubble;
+ cellInBubble.x() = cell_idx_c(box.xMin() + real_c(0.5) * box.xSize());
+ cellInBubble.y() = cell_idx_c(box.yMin() + real_c(0.5) * box.ySize());
+ cellInBubble.z() = cell_idx_c(box.zMin() + real_c(0.5) * box.zSize());
+
+ // set bubble to atmosphere with constant density higher than the initial fluid density
+ const real_t atmDensity = real_c(1.1);
+ bubbleModel->setAtmosphere(cellInBubble, atmDensity);
+
+ // create timeloop; 400 time steps are required (for very low omega of 0.51) to ensure that fluid density has
+ // stabilized
+ SweepTimeloop timeloop(blockForest, uint_c(400));
+
+ // add communication
+ blockforest::communication::UniformBufferedScheme< Stencil_T > comm(blockForest);
+ comm.addPackInfo(std::make_shared< field::communication::PackInfo< PdfField_T > >(pdfFieldID));
+ comm.addPackInfo(std::make_shared< field::communication::PackInfo< ScalarField_T > >(fillFieldID));
+ comm.addPackInfo(std::make_shared< field::communication::PackInfo< FlagField_T > >(flagFieldID));
+
+ // communicate
+ comm();
+
+ // add various sweeps for surface dynamics
+ SurfaceDynamicsHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > dynamicsHandler(
+ blockForest, pdfFieldID, flagFieldID, fillFieldID, forceFieldID, normalFieldID, curvatureFieldID,
+ freeSurfaceBoundaryHandling, bubbleModel, "NormalBasedKeepCenter", "EquilibriumRefilling", "EvenlyNewInterface",
+ relaxRate, Vector3< real_t >(real_c(0)), real_c(0), false, false, real_c(1e-3), real_c(1e-1));
+ dynamicsHandler.addSweeps(timeloop);
+
+ real_t initialMass =
+ computeTotalMass< LatticeModel_T, FlagField_T >(blockForest, pdfFieldID, fillFieldID, flagFieldID, flagInfo);
+
+ timeloop.run();
+
+ // in the absence of forces, fluid density must balance atmosphere density
+ real_t rhoMin = real_c(0);
+ real_t rhoMax = real_c(0);
+ computeMinMaxDensity< LatticeModel_T, FlagField_T >(blockForest, pdfFieldID, flagFieldID, flagInfo, rhoMin, rhoMax);
+ WALBERLA_CHECK_FLOAT_EQUAL(atmDensity, rhoMin);
+ WALBERLA_CHECK_FLOAT_EQUAL(atmDensity, rhoMax);
+
+ // mass must be conserved
+ real_t finalMass =
+ computeTotalMass< LatticeModel_T, FlagField_T >(blockForest, pdfFieldID, fillFieldID, flagFieldID, flagInfo);
+ WALBERLA_CHECK_FLOAT_EQUAL(initialMass, finalMass);
+
+ MPIManager::instance()->resetMPI();
+}
+
+// compute the total mass of the fluid (in all interface and liquid cells)
+template< typename LatticeModel_T, typename FlagField_T >
+real_t computeTotalMass(
+ const std::weak_ptr< StructuredBlockForest >& blockForestPtr, ConstBlockDataID pdfFieldID,
+ ConstBlockDataID fillFieldID, ConstBlockDataID flagFieldID,
+ const typename FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::FlagInfo_T& flagInfo)
+{
+ const auto blockForest = blockForestPtr.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ real_t mass = real_c(0);
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ const lbm::PdfField< LatticeModel_T >* const pdfField =
+ blockIt->getData< const lbm::PdfField< LatticeModel_T > >(pdfFieldID);
+ const ScalarField_T* const fillField = blockIt->getData< const ScalarField_T >(fillFieldID);
+ const FlagField_T* const flagField = blockIt->getData< const FlagField_T >(flagFieldID);
+
+ // iterate over all interface and liquid cells and compute the total mass of fluid in the domain
+ WALBERLA_FOR_ALL_CELLS_OMP(fillFieldIt, fillField, pdfFieldIt, pdfField, flagFieldIt, flagField,
+ omp parallel for schedule(static) reduction(+:mass),
+ {
+ const real_t rho = lbm::getDensity< LatticeModel_T >(pdfField->latticeModel(), pdfFieldIt);
+ if (flagInfo.isInterface(flagFieldIt)) { mass += rho * (*fillFieldIt); }
+ else
+ {
+ if (flagInfo.isLiquid(flagFieldIt)) { mass += rho; }
+ }
+ }); // WALBERLA_FOR_ALL_CELLS_OMP
+ }
+
+ WALBERLA_LOG_RESULT("Total current mass " << mass << ".");
+
+ return mass;
+}
+
+// compute the minimum and maximum density in all interface and liquid cells
+template< typename LatticeModel_T, typename FlagField_T >
+void computeMinMaxDensity(
+ const std::weak_ptr< StructuredBlockForest >& blockForestPtr, ConstBlockDataID pdfFieldID,
+ ConstBlockDataID flagFieldID,
+ const typename FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >::FlagInfo_T& flags,
+ real_t& minDensity, real_t& maxDensity)
+{
+ const auto blockForest = blockForestPtr.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ minDensity = std::numeric_limits< real_t >::max();
+ maxDensity = std::numeric_limits< real_t >::min();
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ const lbm::PdfField< LatticeModel_T >* const pdfField =
+ blockIt->getData< const lbm::PdfField< LatticeModel_T > >(pdfFieldID);
+ const FlagField_T* const flagField = blockIt->getData< const FlagField_T >(flagFieldID);
+
+ // iterate over all interface and liquid cells and find the minimum and maximum density; explicitly avoid OpenMP
+ // (problematic to reduce max and min)
+ WALBERLA_FOR_ALL_CELLS_OMP(flagFieldIt, flagField, pdfFieldIt, pdfField, omp critical, {
+ if (flags.isInterface(flagFieldIt) || flags.isLiquid(flagFieldIt))
+ {
+ const real_t rho = lbm::getDensity< LatticeModel_T >(pdfField->latticeModel(), pdfFieldIt);
+ minDensity = std::min(rho, minDensity);
+ maxDensity = std::max(rho, maxDensity);
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+}
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+
+ WALBERLA_LOG_INFO("Testing with D2Q9 stencil.")
+ testCellConversion< walberla::lbm::D2Q9< walberla::lbm::collision_model::SRT, true > >();
+
+ WALBERLA_LOG_INFO("Testing with D3Q19 stencil.")
+ testCellConversion< walberla::lbm::D3Q19< walberla::lbm::collision_model::SRT, true > >();
+
+ WALBERLA_LOG_INFO("Testing with D3Q27 stencil.")
+ testCellConversion< walberla::lbm::D3Q27< walberla::lbm::collision_model::SRT, true > >();
+
+ return EXIT_SUCCESS;
+}
+} // namespace CellConversionTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::CellConversionTest::main(argc, argv); }
\ No newline at end of file
diff --git a/tests/lbm/free_surface/dynamics/CodegenTest.cpp b/tests/lbm/free_surface/dynamics/CodegenTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..a141a0a3c8ea4f2032192383cb3ea27209f40a6f
--- /dev/null
+++ b/tests/lbm/free_surface/dynamics/CodegenTest.cpp
@@ -0,0 +1,227 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file CodegenTest.cpp
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Test equivalence of generated LBM kernels in the free surface implementation.
+//!
+//! Simulates 100 time steps of a moving drop with diameter 2 in a periodic 4x4x4 domain. The drop moves due to a
+//! constant body force.
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface/bubble_model/Geometry.h"
+#include "lbm/free_surface/dynamics/SurfaceDynamicsHandler.h"
+#include "lbm/free_surface/surface_geometry/SurfaceGeometryHandler.h"
+#include "lbm/lattice_model/D3Q19.h"
+
+#include <type_traits>
+
+// include files generated by lbmpy
+#include "GeneratedLatticeModel_FreeSurface.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace CodegenTest
+{
+
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+
+template< bool useCodegen >
+void runSimulation()
+{
+ using CollisionModel_T = lbm::collision_model::SRT;
+ using ForceModel_T = lbm::force_model::GuoField< VectorField_T >;
+ using LatticeModel_T = typename std::conditional< useCodegen, lbm::GeneratedLatticeModel_FreeSurface,
+ lbm::D3Q19< CollisionModel_T, true, ForceModel_T, 2 > >::type;
+
+ using Communication_T = blockforest::SimpleCommunication< typename LatticeModel_T::CommunicationStencil >;
+
+ using flag_t = uint32_t;
+ using FlagField_T = FlagField< flag_t >;
+ using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+ // define the domain size
+ const Vector3< uint_t > numBlocks(uint_c(1));
+ const Vector3< uint_t > domainSize(uint_c(4), uint_c(4), uint_c(4));
+ const Vector3< uint_t > cellsPerBlock(domainSize[0] / numBlocks[0], domainSize[1] / numBlocks[1],
+ domainSize[2] / numBlocks[2]);
+
+ // create block grid
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ blockforest::createUniformBlockGrid(numBlocks[0], numBlocks[1], numBlocks[2], // blocks
+ cellsPerBlock[0], cellsPerBlock[1], cellsPerBlock[2], // cells
+ real_c(1.0), // dx
+ true, // one block per process
+ true, true, true); // periodicity
+
+ // physics parameters
+ const real_t dropDiameter = real_c(2);
+ const real_t relaxationRate = real_c(1.8);
+ const real_t surfaceTension = real_c(1e-5);
+ const bool enableWetting = false;
+ const real_t contactAngle = real_c(0);
+ const Vector3< real_t > force = Vector3< real_t >(real_c(1e-5), real_c(0), real_c(0));
+
+ // model parameters
+ const std::string pdfReconstructionModel = "NormalBasedKeepCenter";
+ const std::string pdfRefillingModel = "EquilibriumRefilling";
+ const std::string excessMassDistributionModel = "EvenlyAllInterface";
+ const std::string curvatureModel = "FiniteDifferenceMethod";
+ const bool enableForceWeighting = false;
+ const bool useSimpleMassExchange = false;
+ const real_t cellConversionThreshold = real_c(1e-2);
+ const real_t cellConversionForceThreshold = real_c(1e-1);
+
+ // add force field
+ const BlockDataID forceFieldID =
+ field::addToStorage< VectorField_T >(blockForest, "Force field", force, field::fzyx, uint_c(1));
+
+ std::shared_ptr< LatticeModel_T > latticeModel;
+
+ // create lattice model
+ if constexpr (useCodegen)
+ {
+ latticeModel = std::make_shared< LatticeModel_T >(force[0], force[1], force[2], relaxationRate);
+ }
+ else
+ {
+ latticeModel = std::make_shared< LatticeModel_T >(CollisionModel_T(relaxationRate), ForceModel_T(forceFieldID));
+ }
+
+ // add various fields
+ const BlockDataID pdfFieldID = lbm::addPdfFieldToStorage(blockForest, "PDF field", *latticeModel, field::fzyx);
+ const BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill level field", real_c(0.0), field::fzyx, uint_c(1));
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+
+ // add drop to fill level field
+ const geometry::Sphere sphereDrop(Vector3< real_t >(real_c(0.5) * real_c(domainSize[0]),
+ real_c(0.5) * real_c(domainSize[1]),
+ real_c(0.5) * real_c(domainSize[2])),
+ real_c(dropDiameter) * real_c(0.5));
+ bubble_model::addBodyToFillLevelField< geometry::Sphere >(*blockForest, fillFieldID, sphereDrop, false);
+
+ // initialize flag field from fill level field
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+
+ // initial Communication_Tunication
+ Communication_T(blockForest, pdfFieldID, fillFieldID, flagFieldID, forceFieldID)();
+
+ // add bubble model
+ const std::shared_ptr< bubble_model::BubbleModelConstantPressure > bubbleModel =
+ std::make_shared< bubble_model::BubbleModelConstantPressure >(real_c(1));
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, uint_c(100));
+
+ // Laplace pressure = 2 * surface tension * curvature; curvature computation is not necessary with 0 surface tension
+ bool computeCurvature = false;
+ if (!realIsEqual(surfaceTension, real_c(0), real_c(1e-14))) { computeCurvature = true; }
+
+ // add surface geometry handler
+ const SurfaceGeometryHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > geometryHandler(
+ blockForest, freeSurfaceBoundaryHandling, fillFieldID, curvatureModel, computeCurvature, enableWetting,
+ contactAngle);
+
+ const ConstBlockDataID curvatureFieldID = geometryHandler.getConstCurvatureFieldID();
+ const ConstBlockDataID normalFieldID = geometryHandler.getConstNormalFieldID();
+
+ geometryHandler.addSweeps(timeloop);
+
+ // add boundary handling for standard boundaries and free surface boundaries
+ SurfaceDynamicsHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T, useCodegen > dynamicsHandler(
+ blockForest, pdfFieldID, flagFieldID, fillFieldID, forceFieldID, normalFieldID, curvatureFieldID,
+ freeSurfaceBoundaryHandling, bubbleModel, pdfReconstructionModel, pdfRefillingModel, excessMassDistributionModel,
+ relaxationRate, force, surfaceTension, enableForceWeighting, useSimpleMassExchange, cellConversionThreshold,
+ cellConversionForceThreshold);
+
+ dynamicsHandler.addSweeps(timeloop);
+
+ timeloop.run();
+
+ // check fill level (must be identical in lattice model from waLBerla and from lbmpy)
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ const ScalarField_T* const fillField = blockIt->template getData< const ScalarField_T >(fillFieldID);
+
+ WALBERLA_FOR_ALL_CELLS(fillFieldIt, fillField, {
+ if (fillFieldIt.cell() == Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(1)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.504035), real_c(1e-4));
+ }
+ if (fillFieldIt.cell() == Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(1)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.538017), real_c(1e-4));
+ }
+ if (fillFieldIt.cell() == Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(1)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.504035), real_c(1e-4));
+ }
+ if (fillFieldIt.cell() == Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(1)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.538017), real_c(1e-4));
+ }
+ if (fillFieldIt.cell() == Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(2)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.504035), real_c(1e-4));
+ }
+ if (fillFieldIt.cell() == Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(2)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.538017), real_c(1e-4));
+ }
+ if (fillFieldIt.cell() == Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(2)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.504035), real_c(1e-4));
+ }
+ if (fillFieldIt.cell() == Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(2)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.538017), real_c(1e-4));
+ }
+ }); // WALBERLA_FOR_ALL_CELLS
+ }
+}
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment walberlaEnv(argc, argv);
+
+ WALBERLA_LOG_INFO_ON_ROOT("Testing with lattice model from waLBerla.");
+ runSimulation< false >();
+
+ WALBERLA_LOG_INFO_ON_ROOT("Testing with lattice model generated by lbmpy.");
+ runSimulation< true >();
+
+ return EXIT_SUCCESS;
+}
+
+} // namespace CodegenTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::CodegenTest::main(argc, argv); }
diff --git a/tests/lbm/free_surface/dynamics/ExcessMassDistributionFallbackTest.cpp b/tests/lbm/free_surface/dynamics/ExcessMassDistributionFallbackTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..69c075f9eb27626d2708301b296e29b114c3b6e4
--- /dev/null
+++ b/tests/lbm/free_surface/dynamics/ExcessMassDistributionFallbackTest.cpp
@@ -0,0 +1,360 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file ExcessMassDistributionFallbackTest.cpp
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Test excess mass distribution in cases where the chosen model is not applicable.
+//!
+//! Test if fall back to other models works correctly with a simple two-dimensional 3x3 grid, where the center cell at
+//! (1,1) is assumed to have converted from interface to liquid with excess mass 0.1.
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+
+#include "field/FieldClone.h"
+
+#include "lbm/blockforest/communication/SimpleCommunication.h"
+#include "lbm/field/Adaptors.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface/boundary/FreeSurfaceBoundaryHandling.h"
+#include "lbm/free_surface/bubble_model/Geometry.h"
+#include "lbm/free_surface/dynamics/ExcessMassDistributionModel.h"
+#include "lbm/free_surface/dynamics/ExcessMassDistributionSweep.h"
+#include "lbm/lattice_model/D2Q9.h"
+
+#include "timeloop/SweepTimeloop.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace ExcessMassDistributionFallbackTest
+{
+using LatticeModel_T = lbm::D2Q9< lbm::collision_model::SRT, true, lbm::force_model::None, 2 >;
+using Stencil = typename LatticeModel_T::Stencil;
+
+using Communication_T = blockforest::SimpleCommunication< LatticeModel_T::CommunicationStencil >;
+
+using PdfField_T = lbm::PdfField< LatticeModel_T >;
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+
+using flag_t = uint32_t;
+using FlagField_T = FlagField< flag_t >;
+using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+void runSimulation(const ExcessMassDistributionModel& excessMassDistributionModel,
+ const std::vector< Cell >& newInterfaceCells, const std::vector< Cell >& oldInterfaceCells,
+ const Vector3< real_t >& interfaceNormal)
+{
+ // define the domain size
+ const Vector3< uint_t > numBlocks(uint_c(1));
+ const Vector3< uint_t > domainSize(uint_c(3), uint_c(3), uint_c(1));
+ const Vector3< uint_t > cellsPerBlock(domainSize[0] / numBlocks[0], domainSize[1] / numBlocks[1],
+ domainSize[2] / numBlocks[2]);
+
+ // create block grid
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ blockforest::createUniformBlockGrid(numBlocks[0], numBlocks[1], numBlocks[2], // blocks
+ cellsPerBlock[0], cellsPerBlock[1], cellsPerBlock[2], // cells
+ real_c(1.0), // dx
+ true, // one block per process
+ false, false, false); // periodicity
+
+ // create (dummy) lattice model
+ LatticeModel_T latticeModel = LatticeModel_T(lbm::collision_model::SRT(real_c(1.8)));
+
+ // add pdf field
+ const BlockDataID pdfFieldID = lbm::addPdfFieldToStorage(blockForest, "PDF field", latticeModel,
+ Vector3< real_t >(real_c(0)), real_c(1), field::fzyx);
+
+ // add normal field
+ const BlockDataID normalFieldID = field::addToStorage< VectorField_T >(
+ blockForest, "Normal field", Vector3< real_t >(real_c(0)), field::fzyx, uint_c(1));
+
+ // add fill level field
+ const BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill level field", real_c(1), field::fzyx, uint_c(1));
+
+ // initialize fill levels and interface normal
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ ScalarField_T* const fillField = blockIt->getData< ScalarField_T >(fillFieldID);
+ VectorField_T* const normalField = blockIt->getData< VectorField_T >(normalFieldID);
+
+ WALBERLA_FOR_ALL_CELLS(fillFieldIt, fillField, normalFieldIt, normalField, {
+ // initialize interface cells
+ for (const Cell& cell : newInterfaceCells)
+ {
+ if (fillFieldIt.cell() == cell) { *fillFieldIt = real_c(0.5); }
+ }
+
+ for (const Cell& cell : oldInterfaceCells)
+ {
+ if (fillFieldIt.cell() == cell) { *fillFieldIt = real_c(0.5); }
+ }
+
+ // this cell is assigned a fill level of 1.1 leading to an excess mass equivalent to a fill level of 0.1
+ if (fillFieldIt.cell() == Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0))) { *fillFieldIt = real_c(1.1); }
+
+ if (normalFieldIt.cell() == Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)))
+ {
+ *normalFieldIt = interfaceNormal;
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+
+ // initialize flags
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ FlagField_T* const flagField = blockIt->getData< FlagField_T >(flagFieldID);
+
+ WALBERLA_FOR_ALL_CELLS(flagFieldIt, flagField, {
+ // flag the cell with excess mass as newly converted to liquid
+ if (flagFieldIt.cell() == Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)))
+ {
+ field::addFlag(flagFieldIt, flagInfo.convertedFlag | flagInfo.convertToLiquidFlag);
+ }
+
+ // consider these cells to be newly-converted to interface
+ for (const Cell& cell : newInterfaceCells)
+ {
+ if (flagFieldIt.cell() == cell) { field::addFlag(flagFieldIt, flagInfo.convertedFlag); }
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ // initial communication
+ Communication_T(blockForest, pdfFieldID, fillFieldID, flagFieldID, normalFieldID)();
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, uint_c(1));
+
+ if (excessMassDistributionModel.isEvenlyType())
+ {
+ const ExcessMassDistributionSweepInterfaceEvenly< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >
+ distributeMassSweep(excessMassDistributionModel, fillFieldID, flagFieldID, pdfFieldID, flagInfo);
+ timeloop.add() << Sweep(distributeMassSweep, "Distribute excess mass");
+ }
+ else
+ {
+ if (excessMassDistributionModel.isWeightedType())
+ {
+ const ExcessMassDistributionSweepInterfaceWeighted< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >
+ distributeMassSweep(excessMassDistributionModel, fillFieldID, flagFieldID, pdfFieldID, flagInfo,
+ normalFieldID);
+ timeloop.add() << Sweep(distributeMassSweep, "Distribute excess mass");
+ }
+ }
+
+ timeloop.singleStep();
+
+ // check if excess mass was distributed correctly; expected solutions were obtained manually
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ const ScalarField_T* const fillField = blockIt->getData< const ScalarField_T >(fillFieldID);
+
+ WALBERLA_FOR_ALL_CELLS(fillFieldIt, fillField, {
+ if (excessMassDistributionModel.getModelType() ==
+ ExcessMassDistributionModel::ExcessMassModel::EvenlyOldInterface)
+ {
+ if (fillFieldIt.cell() == Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (fillFieldIt.cell() == Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.6), real_c(1e-4));
+ }
+ }
+
+ if (excessMassDistributionModel.getModelType() ==
+ ExcessMassDistributionModel::ExcessMassModel::EvenlyNewInterface)
+ {
+ if (fillFieldIt.cell() == Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (fillFieldIt.cell() == Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.6), real_c(1e-4));
+ }
+ }
+
+ if (excessMassDistributionModel.getModelType() ==
+ ExcessMassDistributionModel::ExcessMassModel::WeightedOldInterface &&
+ !oldInterfaceCells.empty())
+ {
+ if (fillFieldIt.cell() == Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (fillFieldIt.cell() == Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (fillFieldIt.cell() == Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.6), real_c(1e-4));
+ }
+ }
+
+ if (excessMassDistributionModel.getModelType() ==
+ ExcessMassDistributionModel::ExcessMassModel::WeightedNewInterface &&
+ !newInterfaceCells.empty())
+ {
+ if (fillFieldIt.cell() == Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (fillFieldIt.cell() == Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (fillFieldIt.cell() == Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.6), real_c(1e-4));
+ }
+ }
+
+ if (excessMassDistributionModel.getModelType() ==
+ ExcessMassDistributionModel::ExcessMassModel::WeightedOldInterface &&
+ oldInterfaceCells.empty())
+ {
+ if (fillFieldIt.cell() == Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (fillFieldIt.cell() == Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.55), real_c(1e-4));
+ }
+
+ if (fillFieldIt.cell() == Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.55), real_c(1e-4));
+ }
+ }
+
+ if (excessMassDistributionModel.getModelType() ==
+ ExcessMassDistributionModel::ExcessMassModel::WeightedNewInterface &&
+ newInterfaceCells.empty())
+ {
+ if (fillFieldIt.cell() == Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (fillFieldIt.cell() == Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.55), real_c(1e-4));
+ }
+
+ if (fillFieldIt.cell() == Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.55), real_c(1e-4));
+ }
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ MPIManager::instance()->resetMPI();
+}
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+
+ Vector3< real_t > interfaceNormal(real_c(0));
+
+ // (0,0) is the only interface cell (newly-converted) => EvenlyOldInterface must fall back to EvenlyNewInterface
+ ExcessMassDistributionModel model = ExcessMassDistributionModel("EvenlyOldInterface");
+ std::vector< Cell > newInterfaceCells{ Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)) };
+ std::vector< Cell > oldInterfaceCells{};
+ WALBERLA_LOG_INFO_ON_ROOT("Testing model " << model.getFullModelSpecification());
+ runSimulation(model, newInterfaceCells, oldInterfaceCells, interfaceNormal);
+
+ // (0,0) is the only interface cell (not newly-converted) => EvenlyNewInterface must fall back to EvenlyOldInterface
+ model = ExcessMassDistributionModel("EvenlyNewInterface");
+ newInterfaceCells = std::vector< Cell >{};
+ oldInterfaceCells = std::vector< Cell >{ Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)) };
+ WALBERLA_LOG_INFO_ON_ROOT("Testing model " << model.getFullModelSpecification());
+ runSimulation(model, newInterfaceCells, oldInterfaceCells, interfaceNormal);
+
+ interfaceNormal = Vector3< real_t >(real_c(0.71), real_c(0.71), real_c(0));
+
+ // (0,0) is old interface cell; (2,2) is newly-converted interface cell; interface normal points in direction (1,1)
+ // => WeightedOldInterface must fall back to WeightedNewInterface
+ model = ExcessMassDistributionModel("WeightedOldInterface");
+ newInterfaceCells = std::vector< Cell >{ Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(0)) };
+ oldInterfaceCells = std::vector< Cell >{ Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)) };
+ WALBERLA_LOG_INFO_ON_ROOT("Testing model " << model.getFullModelSpecification());
+ runSimulation(model, newInterfaceCells, oldInterfaceCells, interfaceNormal);
+
+ // (0,0) is newly-converted interface cell; (2,2) is old interface cell; interface normal points in direction (1,1)
+ // => WeightedNewInterface must fall back to WeightedOldInterface
+ model = ExcessMassDistributionModel("WeightedNewInterface");
+ newInterfaceCells = std::vector< Cell >{ Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)) };
+ oldInterfaceCells = std::vector< Cell >{ Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(0)) };
+ WALBERLA_LOG_INFO_ON_ROOT("Testing model " << model.getFullModelSpecification());
+ runSimulation(model, newInterfaceCells, oldInterfaceCells, interfaceNormal);
+
+ interfaceNormal = Vector3< real_t >(real_c(0), real_c(-1), real_c(0));
+
+ // (1,2) and (2,2) are newly-converted interface cells; interface normal points in direction (0,-1)
+ // => WeightedOldInterface must fall back to EvenlyAllInterface, as no interface cell is available in normal
+ // direction
+ model = ExcessMassDistributionModel("WeightedOldInterface");
+ newInterfaceCells = std::vector< Cell >{ Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(0)),
+ Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(0)) };
+ oldInterfaceCells = std::vector< Cell >{};
+ WALBERLA_LOG_INFO_ON_ROOT("Testing model " << model.getFullModelSpecification());
+ runSimulation(model, newInterfaceCells, oldInterfaceCells, interfaceNormal);
+
+ // (1,2) and (2,2) are old interface cells; interface normal points in direction (0,-1)
+ // => WeightedNewInterface must fall back to EvenlyAllInterface, as no interface cell is available in normal
+ // direction
+ model = ExcessMassDistributionModel("WeightedNewInterface");
+ newInterfaceCells = std::vector< Cell >{};
+ oldInterfaceCells = std::vector< Cell >{ Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(0)),
+ Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(0)) };
+ WALBERLA_LOG_INFO_ON_ROOT("Testing model " << model.getFullModelSpecification());
+ runSimulation(model, newInterfaceCells, oldInterfaceCells, interfaceNormal);
+
+ return EXIT_SUCCESS;
+}
+} // namespace ExcessMassDistributionFallbackTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::ExcessMassDistributionFallbackTest::main(argc, argv); }
\ No newline at end of file
diff --git a/tests/lbm/free_surface/dynamics/ExcessMassDistributionParallelTest.cpp b/tests/lbm/free_surface/dynamics/ExcessMassDistributionParallelTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..8c99cf8726ecd46fff29da30d9706edebb45ffcc
--- /dev/null
+++ b/tests/lbm/free_surface/dynamics/ExcessMassDistributionParallelTest.cpp
@@ -0,0 +1,1154 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file ExcessMassDistributionParallelTest.cpp
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Test distribution of excess mass using two blocks (to verify also on a parallel environment).
+//!
+//! The tests and their expected solutions are also shown in the file
+//! "/tests/lbm/free_surface/dynamics/ExcessMassDistributionParallelTest.odp".
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+
+#include "field/FieldClone.h"
+
+#include "lbm/blockforest/communication/SimpleCommunication.h"
+#include "lbm/field/Adaptors.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface/boundary/FreeSurfaceBoundaryHandling.h"
+#include "lbm/free_surface/bubble_model/Geometry.h"
+#include "lbm/free_surface/dynamics/ExcessMassDistributionModel.h"
+#include "lbm/free_surface/dynamics/ExcessMassDistributionSweep.h"
+#include "lbm/lattice_model/D2Q9.h"
+
+#include "timeloop/SweepTimeloop.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace ExcessMassDistributionTest
+{
+using LatticeModel_T = lbm::D2Q9< lbm::collision_model::SRT, true, lbm::force_model::None, 2 >;
+using Stencil = typename LatticeModel_T::Stencil;
+
+using Communication_T = blockforest::SimpleCommunication< LatticeModel_T::CommunicationStencil >;
+
+using PdfField_T = lbm::PdfField< LatticeModel_T >;
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+
+using flag_t = uint32_t;
+using FlagField_T = FlagField< flag_t >;
+using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+void runSimulation(const ExcessMassDistributionModel& excessMassDistributionModel)
+{
+ // define the domain size
+ const Vector3< uint_t > numBlocks(uint_c(2), uint_c(1), uint_c(1));
+ const Vector3< uint_t > domainSize(uint_c(6), uint_c(3), uint_c(1));
+ const Vector3< uint_t > cellsPerBlock(domainSize[0] / numBlocks[0], domainSize[1] / numBlocks[1],
+ domainSize[2] / numBlocks[2]);
+
+ // create block grid
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ blockforest::createUniformBlockGrid(numBlocks[0], numBlocks[1], numBlocks[2], // blocks
+ cellsPerBlock[0], cellsPerBlock[1], cellsPerBlock[2], // cells
+ real_c(1.0), // dx
+ true, // one block per process
+ false, false, false); // periodicity
+
+ // create (dummy) lattice model
+ LatticeModel_T latticeModel = LatticeModel_T(lbm::collision_model::SRT(real_c(1.8)));
+
+ // add pdf field
+ const BlockDataID pdfFieldID = lbm::addPdfFieldToStorage(blockForest, "PDF field", latticeModel,
+ Vector3< real_t >(real_c(0)), real_c(1), field::fzyx);
+
+ // add normal field
+ const BlockDataID normalFieldID = field::addToStorage< VectorField_T >(
+ blockForest, "Normal field", Vector3< real_t >(real_c(0)), field::fzyx, uint_c(1));
+
+ // add fill level field
+ const BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill level field", real_c(1), field::fzyx, uint_c(1));
+
+ // add field for excess mass
+ const BlockDataID excessMassFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Excess mass field", real_c(0), field::fzyx, uint_c(1));
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ // initialize cells as in file "/tests/lbm/free_surface/dynamics/ExcessMassDistributionParallelTest.odp"
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ ScalarField_T* const fillField = blockIt->getData< ScalarField_T >(fillFieldID);
+ ScalarField_T* const excessMassField = blockIt->getData< ScalarField_T >(excessMassFieldID);
+ FlagField_T* const flagField = blockIt->getData< FlagField_T >(flagFieldID);
+ PdfField_T* const pdfField = blockIt->getData< PdfField_T >(pdfFieldID);
+ VectorField_T* const normalField = blockIt->getData< VectorField_T >(normalFieldID);
+
+ WALBERLA_FOR_ALL_CELLS(
+ fillFieldIt, fillField, excessMassFieldIt, excessMassField, flagFieldIt, flagField, pdfFieldIt, pdfField,
+ normalFieldIt, normalField, {
+ const Cell localCell = fillFieldIt.cell();
+
+ // get global coordinate of this cell
+ Cell globalCell;
+ blockForest->transformBlockLocalToGlobalCell(globalCell, *blockIt, localCell);
+
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)))
+ {
+ *fillFieldIt = real_c(1);
+ *excessMassFieldIt = real_c(0.2);
+ pdfField->setDensityAndVelocity(localCell, Vector3< real_t >(real_c(0)), real_c(1));
+ field::addFlag(flagFieldIt, flagInfo.liquidFlag);
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(0), cell_idx_c(0)))
+ {
+ *fillFieldIt = real_c(0.5);
+ pdfField->setDensityAndVelocity(localCell, Vector3< real_t >(real_c(0)), real_c(1.5));
+ field::addFlag(flagFieldIt, flagInfo.interfaceFlag | flagInfo.convertedFlag);
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(0), cell_idx_c(0)))
+ {
+ *fillFieldIt = real_c(0.5);
+ pdfField->setDensityAndVelocity(localCell, Vector3< real_t >(real_c(0)), real_c(1.4));
+ field::addFlag(flagFieldIt, flagInfo.interfaceFlag);
+ }
+
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(0)))
+ {
+ *fillFieldIt = real_c(1);
+ *excessMassFieldIt = real_c(0.1);
+ pdfField->setDensityAndVelocity(localCell, Vector3< real_t >(real_c(0)), real_c(1));
+ field::addFlag(flagFieldIt, flagInfo.liquidFlag);
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)))
+ {
+ *fillFieldIt = real_c(1.1);
+ pdfField->setDensityAndVelocity(localCell, Vector3< real_t >(real_c(0)), real_c(1));
+ field::addFlag(flagFieldIt, flagInfo.liquidFlag | flagInfo.convertedFlag);
+ *normalFieldIt = Vector3< real_t >(real_c(0.71), real_c(0.71), real_c(0));
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(0)))
+ {
+ *fillFieldIt = real_c(0.5);
+ pdfField->setDensityAndVelocity(localCell, Vector3< real_t >(real_c(0)), real_c(1.3));
+ field::addFlag(flagFieldIt, flagInfo.interfaceFlag);
+ }
+
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(2), cell_idx_c(0)))
+ {
+ *fillFieldIt = real_c(0);
+ pdfField->setDensityAndVelocity(localCell, Vector3< real_t >(real_c(0)), real_c(1));
+ field::addFlag(flagFieldIt, flagInfo.gasFlag);
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(0)))
+ {
+ *fillFieldIt = real_c(0.5);
+ pdfField->setDensityAndVelocity(localCell, Vector3< real_t >(real_c(0)), real_c(1.1));
+ field::addFlag(flagFieldIt, flagInfo.interfaceFlag | flagInfo.convertedFlag);
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(0)))
+ {
+ *fillFieldIt = real_c(0.5);
+ pdfField->setDensityAndVelocity(localCell, Vector3< real_t >(real_c(0)), real_c(1.2));
+ field::addFlag(flagFieldIt, flagInfo.interfaceFlag);
+ }
+
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(0), cell_idx_c(0)))
+ {
+ *fillFieldIt = real_c(0.5);
+ pdfField->setDensityAndVelocity(localCell, Vector3< real_t >(real_c(0)), real_c(0.5));
+ field::addFlag(flagFieldIt, flagInfo.interfaceFlag | flagInfo.convertedFlag);
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(0), cell_idx_c(0)))
+ {
+ *fillFieldIt = real_c(0.5);
+ pdfField->setDensityAndVelocity(localCell, Vector3< real_t >(real_c(0)), real_c(0.6));
+ field::addFlag(flagFieldIt, flagInfo.interfaceFlag | flagInfo.convertedFlag);
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(0), cell_idx_c(0)))
+ {
+ *fillFieldIt = real_c(1);
+ *excessMassFieldIt = real_c(0.03);
+ pdfField->setDensityAndVelocity(localCell, Vector3< real_t >(real_c(0)), real_c(1));
+ field::addFlag(flagFieldIt, flagInfo.liquidFlag);
+ }
+
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(1), cell_idx_c(0)))
+ {
+ *fillFieldIt = real_c(1.2);
+ pdfField->setDensityAndVelocity(localCell, Vector3< real_t >(real_c(0)), real_c(0.95));
+ field::addFlag(flagFieldIt, flagInfo.liquidFlag | flagInfo.convertedFlag);
+ *normalFieldIt = Vector3< real_t >(real_c(0.71), real_c(0.71), real_c(0));
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(1), cell_idx_c(0)))
+ {
+ *fillFieldIt = real_c(0.5);
+ pdfField->setDensityAndVelocity(localCell, Vector3< real_t >(real_c(0)), real_c(0.7));
+ field::addFlag(flagFieldIt, flagInfo.interfaceFlag | flagInfo.convertedFlag);
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(1), cell_idx_c(0)))
+ {
+ *fillFieldIt = real_c(1);
+ *excessMassFieldIt = real_c(0.02);
+ pdfField->setDensityAndVelocity(localCell, Vector3< real_t >(real_c(0)), real_c(1));
+ field::addFlag(flagFieldIt, flagInfo.liquidFlag);
+ }
+
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(2), cell_idx_c(0)))
+ {
+ *fillFieldIt = real_c(0.5);
+ pdfField->setDensityAndVelocity(localCell, Vector3< real_t >(real_c(0)), real_c(0.9));
+ field::addFlag(flagFieldIt, flagInfo.interfaceFlag);
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(2), cell_idx_c(0)))
+ {
+ *fillFieldIt = real_c(0.5);
+ pdfField->setDensityAndVelocity(localCell, Vector3< real_t >(real_c(0)), real_c(0.8));
+ field::addFlag(flagFieldIt, flagInfo.interfaceFlag | flagInfo.convertedFlag);
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(2), cell_idx_c(0)))
+ {
+ *fillFieldIt = real_c(1);
+ *excessMassFieldIt = real_c(0.01);
+ pdfField->setDensityAndVelocity(localCell, Vector3< real_t >(real_c(0)), real_c(1));
+ field::addFlag(flagFieldIt, flagInfo.liquidFlag);
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ // initial communication
+ Communication_T(blockForest, pdfFieldID, fillFieldID, flagFieldID, normalFieldID, excessMassFieldID)();
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, uint_c(1));
+
+ if (excessMassDistributionModel.isEvenlyType())
+ {
+ const ExcessMassDistributionSweepInterfaceEvenly< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >
+ distributeMassSweep(excessMassDistributionModel, fillFieldID, flagFieldID, pdfFieldID, flagInfo);
+ timeloop.add() << Sweep(distributeMassSweep, "Distribute excess mass");
+ }
+ else
+ {
+ if (excessMassDistributionModel.isWeightedType())
+ {
+ const ExcessMassDistributionSweepInterfaceWeighted< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >
+ distributeMassSweep(excessMassDistributionModel, fillFieldID, flagFieldID, pdfFieldID, flagInfo,
+ normalFieldID);
+ timeloop.add() << Sweep(distributeMassSweep, "Distribute excess mass");
+ }
+ else
+ {
+ if (excessMassDistributionModel.isEvenlyLiquidAndAllInterfacePreferInterfaceType())
+ {
+ const ExcessMassDistributionSweepInterfaceAndLiquid< LatticeModel_T, FlagField_T, ScalarField_T,
+ VectorField_T >
+ distributeMassSweep(excessMassDistributionModel, fillFieldID, flagFieldID, pdfFieldID, flagInfo,
+ excessMassFieldID);
+ timeloop.add() << Sweep(distributeMassSweep, "Distribute excess mass");
+ }
+ }
+ }
+
+ timeloop.singleStep();
+
+ // check if excess mass was distributed correctly; expected solutions were obtained manually, see file
+ // "/tests/lbm/free_surface/dynamics/ExcessMassDistributionParallelTest.odp"
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ const ScalarField_T* const fillField = blockIt->getData< const ScalarField_T >(fillFieldID);
+ const ScalarField_T* const excessMassField = blockIt->getData< const ScalarField_T >(excessMassFieldID);
+
+ WALBERLA_FOR_ALL_CELLS(fillFieldIt, fillField, excessMassFieldIt, excessMassField, {
+ Cell globalCell;
+ blockForest->transformBlockLocalToGlobalCell(globalCell, *blockIt, fillFieldIt.cell());
+
+ if (excessMassDistributionModel.getModelType() ==
+ ExcessMassDistributionModel::ExcessMassModel::EvenlyAllInterface)
+ {
+ // left block
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.513333333333333), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.53125), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.533653846153846), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.518181818181818), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.536458333333333), real_c(1e-4));
+ }
+
+ // right block
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5475), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.539583333333333), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.533928571428571), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.526388888888889), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5296875), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+ }
+
+ if (excessMassDistributionModel.getModelType() ==
+ ExcessMassDistributionModel::ExcessMassModel::EvenlyOldInterface)
+ {
+ // left block
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.557738095238095), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.562179487179487), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.567361111111111), real_c(1e-4));
+ }
+
+ // right block
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.552777777777778), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+ }
+
+ if (excessMassDistributionModel.getModelType() ==
+ ExcessMassDistributionModel::ExcessMassModel::EvenlyNewInterface)
+ {
+ // left block
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.533333333333333), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.545454545454546), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ // right block
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.595), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.579166666666667), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.567857142857143), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.559375), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+ }
+
+ if (excessMassDistributionModel.getModelType() ==
+ ExcessMassDistributionModel::ExcessMassModel::WeightedAllInterface)
+ {
+ // left block
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.519230769230769), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.522727272727273), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.541666666666667), real_c(1e-4));
+ }
+
+ // right block
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.567857142857143), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.552777777777778), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.61875), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+ }
+
+ if (excessMassDistributionModel.getModelType() ==
+ ExcessMassDistributionModel::ExcessMassModel::WeightedOldInterface)
+ {
+ // left block
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.525641025641026), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.555555555555556), real_c(1e-4));
+ }
+
+ // right block
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.711111111111111), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+ }
+
+ if (excessMassDistributionModel.getModelType() ==
+ ExcessMassDistributionModel::ExcessMassModel::WeightedNewInterface)
+ {
+ // left block
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.590909090909091), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ // right block
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.59047619047619), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.658333333333333), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ }
+ }
+
+ if (excessMassDistributionModel.getModelType() ==
+ ExcessMassDistributionModel::ExcessMassModel::EvenlyLiquidAndAllInterface)
+ {
+ // left block
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0.039285714285714), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.570634920634921), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.527168367346939), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0.080952380952381), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0.091666666666667), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.529258241758242), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.535714285714286), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.531696428571429), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ // right block
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5475), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.562916666666667), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0.004), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.558690476190476), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0.013333333333333), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.526388888888889), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.538854166666667), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0.004), real_c(1e-4));
+ }
+ }
+
+ if (excessMassDistributionModel.getModelType() ==
+ ExcessMassDistributionModel::ExcessMassModel::EvenlyLiquidAndAllInterfacePreferInterface)
+ {
+ // left block
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.68), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.53125), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.533653846153846), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(0), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.563636363636364), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.536458333333333), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ // right block
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.5475), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.575694444444444), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.57202380952381), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(3), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.526388888888889), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(4), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(0.544270833333333), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+
+ if (globalCell == Cell(cell_idx_c(5), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*fillFieldIt, real_c(1), real_c(1e-4));
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(*excessMassFieldIt, real_c(0), real_c(1e-4));
+ }
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ MPIManager::instance()->resetMPI();
+}
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+
+ ExcessMassDistributionModel model = ExcessMassDistributionModel("EvenlyAllInterface");
+ WALBERLA_LOG_INFO_ON_ROOT("Testing model " << model.getFullModelSpecification());
+ runSimulation(model);
+
+ model = ExcessMassDistributionModel("EvenlyOldInterface");
+ WALBERLA_LOG_INFO_ON_ROOT("Testing model " << model.getFullModelSpecification());
+ runSimulation(model);
+
+ model = ExcessMassDistributionModel("EvenlyNewInterface");
+ WALBERLA_LOG_INFO_ON_ROOT("Testing model " << model.getFullModelSpecification());
+ runSimulation(model);
+
+ model = ExcessMassDistributionModel("WeightedAllInterface");
+ WALBERLA_LOG_INFO_ON_ROOT("Testing model " << model.getFullModelSpecification());
+ runSimulation(model);
+
+ model = ExcessMassDistributionModel("WeightedOldInterface");
+ WALBERLA_LOG_INFO_ON_ROOT("Testing model " << model.getFullModelSpecification());
+ runSimulation(model);
+
+ model = ExcessMassDistributionModel("WeightedNewInterface");
+ WALBERLA_LOG_INFO_ON_ROOT("Testing model " << model.getFullModelSpecification());
+ runSimulation(model);
+
+ model = ExcessMassDistributionModel("EvenlyLiquidAndAllInterface");
+ WALBERLA_LOG_INFO_ON_ROOT("Testing model " << model.getFullModelSpecification());
+ runSimulation(model);
+
+ model = ExcessMassDistributionModel("EvenlyLiquidAndAllInterfacePreferInterface");
+ WALBERLA_LOG_INFO_ON_ROOT("Testing model " << model.getFullModelSpecification());
+ runSimulation(model);
+
+ return EXIT_SUCCESS;
+}
+} // namespace ExcessMassDistributionTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::ExcessMassDistributionTest::main(argc, argv); }
\ No newline at end of file
diff --git a/tests/lbm/free_surface/dynamics/ExcessMassDistributionParallelTest.ods b/tests/lbm/free_surface/dynamics/ExcessMassDistributionParallelTest.ods
new file mode 100644
index 0000000000000000000000000000000000000000..fa159c7b1b01c41933c16c886af01b6344a26bf9
Binary files /dev/null and b/tests/lbm/free_surface/dynamics/ExcessMassDistributionParallelTest.ods differ
diff --git a/tests/lbm/free_surface/dynamics/InflowTest.cpp b/tests/lbm/free_surface/dynamics/InflowTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..da8b5df18d1207957ca33bc9f14327c17caf3279
--- /dev/null
+++ b/tests/lbm/free_surface/dynamics/InflowTest.cpp
@@ -0,0 +1,281 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file InflowTest.cpp
+//! \ingroup lbm/free_surface/dynamics
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Test inflow boundary condition.
+//!
+//! Set inflow boundaries and initialize gas everywhere. After performing one time step, it is evaluated whether gas
+//! cells have been converted to interface and initialized correctly according to the neighboring inflow cells.
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+#include "blockforest/communication/UniformBufferedScheme.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+
+#include "field/AddToStorage.h"
+#include "field/adaptors/AdaptorCreators.h"
+#include "field/communication/PackInfo.h"
+
+#include "lbm/field/Adaptors.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface//FlagInfo.h"
+#include "lbm/free_surface/boundary/FreeSurfaceBoundaryHandling.h"
+#include "lbm/free_surface/dynamics/StreamReconstructAdvectSweep.h"
+#include "lbm/free_surface/dynamics/SurfaceDynamicsHandler.h"
+#include "lbm/free_surface/surface_geometry/SurfaceGeometryHandler.h"
+#include "lbm/lattice_model/CollisionModel.h"
+#include "lbm/lattice_model/D3Q19.h"
+#include "lbm/lattice_model/ForceModel.h"
+
+#include "timeloop/SweepTimeloop.h"
+
+#include <algorithm>
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace InflowTest
+{
+// define types
+using Flag_T = uint32_t;
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+using FlagField_T = FlagField< Flag_T >;
+using LatticeModel_T = lbm::D3Q19< lbm::collision_model::SRT, true, lbm::force_model::None, 2 >;
+
+void testInflow()
+{
+ // define types
+ using Stencil_T = typename LatticeModel_T::Stencil;
+ using PdfField_T = lbm::PdfField< LatticeModel_T >;
+ using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+ // define the domain size
+ const Vector3< uint_t > numBlocks(uint_c(1));
+ const Vector3< uint_t > domainSize(uint_c(10), uint_c(3), uint_c(1));
+ const Vector3< uint_t > cellsPerBlock(domainSize[0] / numBlocks[0], domainSize[1] / numBlocks[1],
+ domainSize[2] / numBlocks[2]);
+
+ // create block grid
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ blockforest::createUniformBlockGrid(numBlocks[0], numBlocks[1], numBlocks[2], // blocks
+ cellsPerBlock[0], cellsPerBlock[1], cellsPerBlock[2], // cells
+ real_c(1.0), // dx
+ true, // one block per process
+ false, false, true); // periodicity
+
+ real_t relaxRate = real_c(0.51);
+
+ // create lattice model with omega=0.51
+ LatticeModel_T latticeModel(relaxRate);
+
+ // add fields
+ BlockDataID pdfFieldID = lbm::addPdfFieldToStorage(blockForest, "PDF field", latticeModel, field::fzyx);
+ BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill levels", real_c(0.0), field::fzyx, uint_c(2));
+ BlockDataID forceFieldID = field::addToStorage< VectorField_T >(
+ blockForest, "Force field", Vector3< real_t >(real_c(0)), field::fzyx, uint_c(1));
+ BlockDataID densityAdaptor = field::addFieldAdaptor< typename lbm::Adaptor< LatticeModel_T >::Density >(
+ blockForest, pdfFieldID, "DensityAdaptor");
+ BlockDataID velocityAdaptor = field::addFieldAdaptor< typename lbm::Adaptor< LatticeModel_T >::VelocityVector >(
+ blockForest, pdfFieldID, "VelocityAdaptor");
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ // set inflow boundary conditions in some cells of the western domain border
+ freeSurfaceBoundaryHandling->setInflowInCell(Cell(cell_idx_c(0), cell_idx_c(-1), cell_idx_c(0)),
+ Vector3< real_t >(real_c(0), real_c(0.01), real_c(0)));
+ freeSurfaceBoundaryHandling->setInflowInCell(Cell(cell_idx_c(-1), cell_idx_c(0), cell_idx_c(0)),
+ Vector3< real_t >(real_c(0.01), real_c(0), real_c(0)));
+ freeSurfaceBoundaryHandling->setInflowInCell(Cell(cell_idx_c(-1), cell_idx_c(1), cell_idx_c(0)),
+ Vector3< real_t >(real_c(0.02), real_c(0), real_c(0)));
+ freeSurfaceBoundaryHandling->setInflowInCell(Cell(cell_idx_c(-1), cell_idx_c(2), cell_idx_c(0)),
+ Vector3< real_t >(real_c(0.03), real_c(0.01), real_c(0)));
+ freeSurfaceBoundaryHandling->setInflowInCell(Cell(cell_idx_c(-1), cell_idx_c(3), cell_idx_c(0)),
+ Vector3< real_t >(real_c(0.04), real_c(0), real_c(0)));
+ freeSurfaceBoundaryHandling->setInflowInCell(Cell(cell_idx_c(-1), cell_idx_c(4), cell_idx_c(0)),
+ Vector3< real_t >(real_c(0.05), real_c(0.02), real_c(0)));
+
+ // these inflow cells should not have any influence as their velocity direction points away from the neighboring gas
+ // cells
+ freeSurfaceBoundaryHandling->setInflowInCell(Cell(cell_idx_c(-1), cell_idx_c(5), cell_idx_c(0)),
+ Vector3< real_t >(real_c(-0.06), real_c(0), real_c(0)));
+ freeSurfaceBoundaryHandling->setInflowInCell(Cell(cell_idx_c(-1), cell_idx_c(6), cell_idx_c(0)),
+ Vector3< real_t >(real_c(-0.07), real_c(0), real_c(0)));
+
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+
+ // add bubble model
+ auto bubbleModel = std::make_shared< bubble_model::BubbleModel< Stencil_T > >(blockForest, true);
+ bubbleModel->initFromFillLevelField(fillFieldID);
+ bubbleModel->setAtmosphere(Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)), real_c(1));
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, uint_c(1));
+
+ // add communication
+ blockforest::communication::UniformBufferedScheme< typename LatticeModel_T::Stencil > comm(blockForest);
+ comm.addPackInfo(std::make_shared< field::communication::PackInfo< PdfField_T > >(pdfFieldID));
+ comm.addPackInfo(std::make_shared< field::communication::PackInfo< ScalarField_T > >(fillFieldID));
+ comm.addPackInfo(
+ std::make_shared< field::communication::PackInfo< FlagField_T > >(freeSurfaceBoundaryHandling->getFlagFieldID()));
+
+ // communicate
+ comm();
+
+ // add surface geometry handler
+ SurfaceGeometryHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > geometryHandler(
+ blockForest, freeSurfaceBoundaryHandling, fillFieldID, "FiniteDifferenceMethod", false, false, real_c(0));
+
+ ConstBlockDataID curvatureFieldID = geometryHandler.getConstCurvatureFieldID();
+ ConstBlockDataID normalFieldID = geometryHandler.getConstNormalFieldID();
+
+ geometryHandler.addSweeps(timeloop);
+
+ // add boundary handling for standard boundaries and free surface boundaries
+ SurfaceDynamicsHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > dynamicsHandler(
+ blockForest, pdfFieldID, flagFieldID, fillFieldID, forceFieldID, normalFieldID, curvatureFieldID,
+ freeSurfaceBoundaryHandling, bubbleModel, "NormalBasedKeepCenter", "EquilibriumRefilling", "EvenlyNewInterface",
+ relaxRate, Vector3< real_t >(real_c(0)), real_c(0), false, false, real_c(1e-3), real_c(1e-1));
+
+ dynamicsHandler.addSweeps(timeloop);
+
+ timeloop.singleStep();
+
+ // evaluate if inflow boundary has generated the correct interface cells
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ const ScalarField_T* const fillField = blockIt->getData< const ScalarField_T >(fillFieldID);
+ const typename lbm::Adaptor< LatticeModel_T >::Density* const densityField =
+ blockIt->getData< const typename lbm::Adaptor< LatticeModel_T >::Density >(densityAdaptor);
+ const typename lbm::Adaptor< LatticeModel_T >::VelocityVector* const velocityField =
+ blockIt->getData< const typename lbm::Adaptor< LatticeModel_T >::VelocityVector >(velocityAdaptor);
+ const FlagField_T* const flagField =
+ blockIt->getData< const FlagField_T >(freeSurfaceBoundaryHandling->getFlagFieldID());
+
+ WALBERLA_FOR_ALL_CELLS(fillFieldIt, fillField, velocityFieldIt, velocityField, densityFieldIt, densityField,
+ flagFieldIt, flagField, {
+ if (flagFieldIt.cell() == Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK(flagInfo.isInterface(flagFieldIt));
+
+ // velocity must be the average from inflow cells (-1,0,0) and (1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL((*velocityFieldIt)[0], real_c(0.005), real_c(1e-15));
+ WALBERLA_CHECK_FLOAT_EQUAL((*velocityFieldIt)[1], real_c(0.005), real_c(1e-15));
+ WALBERLA_CHECK_FLOAT_EQUAL((*velocityFieldIt)[2], real_c(0), real_c(1e-15));
+ WALBERLA_CHECK_FLOAT_EQUAL(*densityFieldIt, real_c(1), real_c(1e-15));
+ continue;
+ }
+
+ if (flagFieldIt.cell() == Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK(flagInfo.isInterface(flagFieldIt));
+
+ // velocity must be identical to the inflow cell (-1,1,0); no other inflow cell
+ // should influence this cell
+ WALBERLA_CHECK_FLOAT_EQUAL((*velocityFieldIt)[0], real_c(0.02), real_c(1e-15));
+ WALBERLA_CHECK_FLOAT_EQUAL((*velocityFieldIt)[1], real_c(0), real_c(1e-15));
+ WALBERLA_CHECK_FLOAT_EQUAL((*velocityFieldIt)[2], real_c(0), real_c(1e-15));
+ WALBERLA_CHECK_FLOAT_EQUAL(*densityFieldIt, real_c(1), real_c(1e-15));
+ continue;
+ }
+
+ if (flagFieldIt.cell() == Cell(cell_idx_c(0), cell_idx_c(2), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK(flagInfo.isInterface(flagFieldIt));
+
+ // velocity must be identical to the inflow cell (-1,2,0); no other inflow cell
+ // should influence this cell
+ WALBERLA_CHECK_FLOAT_EQUAL((*velocityFieldIt)[0], real_c(0.03), real_c(1e-15));
+ WALBERLA_CHECK_FLOAT_EQUAL((*velocityFieldIt)[1], real_c(0.01), real_c(1e-15));
+ WALBERLA_CHECK_FLOAT_EQUAL((*velocityFieldIt)[2], real_c(0), real_c(1e-15));
+ WALBERLA_CHECK_FLOAT_EQUAL(*densityFieldIt, real_c(1), real_c(1e-15));
+ continue;
+ }
+
+ if (flagFieldIt.cell() == Cell(cell_idx_c(0), cell_idx_c(3), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK(flagInfo.isInterface(flagFieldIt));
+
+ // velocity must be the average from inflow cells (-1,2,0) and (-1,3,0)
+ WALBERLA_CHECK_FLOAT_EQUAL((*velocityFieldIt)[0], real_c(0.035), real_c(1e-15));
+ WALBERLA_CHECK_FLOAT_EQUAL((*velocityFieldIt)[1], real_c(0.005), real_c(1e-15));
+ WALBERLA_CHECK_FLOAT_EQUAL((*velocityFieldIt)[2], real_c(0), real_c(1e-15));
+ WALBERLA_CHECK_FLOAT_EQUAL(*densityFieldIt, real_c(1), real_c(1e-15));
+ continue;
+ }
+
+ if (flagFieldIt.cell() == Cell(cell_idx_c(0), cell_idx_c(4), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK(flagInfo.isInterface(flagFieldIt));
+
+ // velocity must be identical to inflow cell (-1,4,0); no other inflow cell
+ // should influence this cell
+ WALBERLA_CHECK_FLOAT_EQUAL((*velocityFieldIt)[0], real_c(0.05), real_c(1e-15));
+ WALBERLA_CHECK_FLOAT_EQUAL((*velocityFieldIt)[1], real_c(0.02), real_c(1e-15));
+ WALBERLA_CHECK_FLOAT_EQUAL((*velocityFieldIt)[2], real_c(0), real_c(1e-15));
+ WALBERLA_CHECK_FLOAT_EQUAL(*densityFieldIt, real_c(1), real_c(1e-15));
+ WALBERLA_LOG_DEVEL_VAR(*velocityFieldIt);
+ WALBERLA_LOG_DEVEL_VAR(flagInfo.isInterface(flagFieldIt));
+ continue;
+ }
+
+ if (flagFieldIt.cell() == Cell(cell_idx_c(0), cell_idx_c(5), cell_idx_c(0)))
+ {
+ // cell must be converted due to velocity vector pointing from inflow
+ // cell(-1,4,0) to this cell
+ WALBERLA_CHECK(flagInfo.isInterface(flagFieldIt));
+
+ // velocity must be identical to inflow cell (-1,4,0); no other inflow cell
+ // should influence this cell
+ WALBERLA_CHECK_FLOAT_EQUAL((*velocityFieldIt)[0], real_c(0.05), real_c(1e-15));
+ WALBERLA_CHECK_FLOAT_EQUAL((*velocityFieldIt)[1], real_c(0.02), real_c(1e-15));
+ WALBERLA_CHECK_FLOAT_EQUAL((*velocityFieldIt)[2], real_c(0), real_c(1e-15));
+ WALBERLA_CHECK_FLOAT_EQUAL(*densityFieldIt, real_c(1), real_c(1e-15));
+ continue;
+ }
+
+ // cell(0,6,0)
+ WALBERLA_CHECK(flagInfo.isGas(flagFieldIt));
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ MPIManager::instance()->resetMPI();
+}
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+
+ testInflow();
+
+ return EXIT_SUCCESS;
+}
+
+} // namespace InflowTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::InflowTest::main(argc, argv); }
\ No newline at end of file
diff --git a/tests/lbm/free_surface/dynamics/LatticeModelGenerationFreeSurface.py b/tests/lbm/free_surface/dynamics/LatticeModelGenerationFreeSurface.py
new file mode 100644
index 0000000000000000000000000000000000000000..0ef55dce4bf764a8f60d310e24427593c1de7834
--- /dev/null
+++ b/tests/lbm/free_surface/dynamics/LatticeModelGenerationFreeSurface.py
@@ -0,0 +1,34 @@
+import sympy as sp
+
+from lbmpy.creationfunctions import LBMConfig, LBMOptimisation, create_lb_collision_rule
+from lbmpy.enums import ForceModel, Method, Stencil
+from lbmpy.stencils import LBStencil
+
+from pystencils_walberla import CodeGeneration
+from lbmpy_walberla import generate_lattice_model
+
+# general parameters
+stencil = LBStencil(Stencil.D3Q19)
+omega = sp.Symbol('omega')
+force = sp.symbols('force_:3')
+layout = 'fzyx'
+
+# method definition
+lbm_config = LBMConfig(stencil=stencil,
+ method=Method.SRT,
+ relaxation_rate=omega,
+ compressible=True,
+ force=force,
+ force_model=ForceModel.GUO,
+ zero_centered=False,
+ streaming_pattern='pull') # free surface implementation only works with pull pattern
+
+# optimizations to be used by the code generator
+lbm_opt = LBMOptimisation(cse_global=True,
+ field_layout=layout)
+
+collision_rule = create_lb_collision_rule(lbm_config=lbm_config,
+ lbm_optimisation=lbm_opt)
+
+with CodeGeneration() as ctx:
+ generate_lattice_model(ctx, "GeneratedLatticeModel_FreeSurface", collision_rule, field_layout=layout)
diff --git a/tests/lbm/free_surface/dynamics/PdfReconstructionFreeSlipTest.cpp b/tests/lbm/free_surface/dynamics/PdfReconstructionFreeSlipTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..15ff0d96d078da1d3e33c958dc67f04b628c1795
--- /dev/null
+++ b/tests/lbm/free_surface/dynamics/PdfReconstructionFreeSlipTest.cpp
@@ -0,0 +1,201 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file PdfReconstructionFreeSlipTest.cpp
+//! \ingroup lbm/free_surface/dynamics
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Test PDF reconstruction due to a free-slip cell near the free surface boundary.
+//!
+//! Initialize a 3x3 grid and test reconstruction of PDFs due to a free slip boundary condition.
+//! [L][L][L] with L: liquid cell; I: interface cell; G: gas cell; f: free-slip cell
+//! [L][I][G] F: free-slip cell of interest (for the following explanation)
+//! [f][f][F]
+//! The PDF that streams from the free-slip cell in the lower right corner (F) into the interface cell (I) must be
+//! reconstructed. This is because PDFs in the free-slip cells are specularly reflected. Therefore, this free-slip
+//! cell's PDF in direction (-1,1) is the same as the the gas cell's PDF in direction (-1,-1). However, since PDFs in
+//! gas cells are not available, this PDF must be reconstructed.
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+
+#include "field/FieldClone.h"
+
+#include "lbm/blockforest/communication/SimpleCommunication.h"
+#include "lbm/field/Adaptors.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface/boundary/FreeSurfaceBoundaryHandling.h"
+#include "lbm/free_surface/bubble_model/Geometry.h"
+#include "lbm/free_surface/dynamics/PdfReconstructionModel.h"
+#include "lbm/free_surface/dynamics/functionality/ReconstructInterfaceCellABB.h"
+#include "lbm/lattice_model/D2Q9.h"
+
+#include "timeloop/SweepTimeloop.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace PdfReconstructionFreeSlipTest
+{
+using LatticeModel_T = lbm::D2Q9< lbm::collision_model::SRT, true, lbm::force_model::None, 2 >;
+using Stencil = typename LatticeModel_T::Stencil;
+
+using Communication_T = blockforest::SimpleCommunication< LatticeModel_T::CommunicationStencil >;
+
+using PdfField_T = lbm::PdfField< LatticeModel_T >;
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+
+using flag_t = uint32_t;
+using FlagField_T = FlagField< flag_t >;
+using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+void runSimulation()
+{
+ // define the domain size
+ const Vector3< uint_t > numBlocks(uint_c(1));
+ const Vector3< uint_t > domainSize(uint_c(3), uint_c(3), uint_c(1));
+ const Vector3< uint_t > cellsPerBlock(domainSize[0] / numBlocks[0], domainSize[1] / numBlocks[1],
+ domainSize[2] / numBlocks[2]);
+
+ // create block grid
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ blockforest::createUniformBlockGrid(numBlocks[0], numBlocks[1], numBlocks[2], // blocks
+ cellsPerBlock[0], cellsPerBlock[1], cellsPerBlock[2], // cells
+ real_c(1.0), // dx
+ true, // one block per process
+ false, false, false); // periodicity
+
+ // create (dummy) lattice model
+ LatticeModel_T latticeModel = LatticeModel_T(lbm::collision_model::SRT(real_c(1.8)));
+
+ // add pdf source and destination fields
+ const BlockDataID pdfSrcFieldID =
+ lbm::addPdfFieldToStorage(blockForest, "PDF source field", latticeModel, uint_c(0), field::fzyx);
+ const BlockDataID pdfDstFieldID =
+ lbm::addPdfFieldToStorage(blockForest, "PDF destination field", latticeModel, uint_c(0), field::fzyx);
+
+ // add (dummy) normal field
+ const BlockDataID normalFieldID = field::addToStorage< VectorField_T >(
+ blockForest, "Normals", Vector3< real_t >(real_c(0)), field::fzyx, uint_c(1));
+
+ // add fill level field (MUST be initialized with 1, i.e., fluid everywhere for this test; otherwise the fluid
+ // flag is not detected below by initFlagsFromFillLevel())
+ const BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill level field", real_c(1), field::fzyx, uint_c(1));
+
+ // central interface cell, in which the reconstruction and evaluation will be performed
+ const Cell centralCell = Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0));
+
+ // construct 3x3 grid with flags according to the description at the top of this file
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ ScalarField_T* const fillField = blockIt->getData< ScalarField_T >(fillFieldID);
+ VectorField_T* const normalField = blockIt->getData< VectorField_T >(normalFieldID);
+
+ WALBERLA_FOR_ALL_CELLS(
+ fillFieldIt, fillField, normalFieldIt, normalField,
+
+ // initialize gas cell
+ if (fillFieldIt.cell() == Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(0))) { *fillFieldIt = real_c(0); }
+
+ // initialize interface cells
+ if (fillFieldIt.cell() == centralCell) { *fillFieldIt = real_c(0.5); }
+
+ // initialize fluid cells
+ if (fillFieldIt.cell() == Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(0)) ||
+ fillFieldIt.cell() == Cell(cell_idx_c(0), cell_idx_c(2), cell_idx_c(0)) ||
+ fillFieldIt.cell() == Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(0)) ||
+ fillFieldIt.cell() == Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(0))) {
+ *fillFieldIt = real_c(1);
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfSrcFieldID, fillFieldID);
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+ freeSurfaceBoundaryHandling->setFreeSlipAtBorder(stencil::S, cell_idx_c(0));
+
+ // initial communication
+ Communication_T(blockForest, pdfSrcFieldID, fillFieldID, flagFieldID)();
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, uint_c(1));
+
+ // perform reconstruction
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ const PdfField_T* const pdfSrcField = blockIt->getData< const PdfField_T >(pdfSrcFieldID);
+ PdfField_T* const pdfDstField = blockIt->getData< PdfField_T >(pdfDstFieldID);
+ const VectorField_T* const normalField = blockIt->getData< const VectorField_T >(normalFieldID);
+ const FlagField_T* const flagField = blockIt->getData< const FlagField_T >(flagFieldID);
+
+ WALBERLA_FOR_ALL_CELLS(
+ pdfSrcFieldIt, pdfSrcField, pdfDstFieldIt, pdfDstField, flagFieldIt, flagField, normalFieldIt, normalField,
+ if (pdfSrcFieldIt.cell() == centralCell) {
+ // reconstruct with rhoGas!=1 such that reconstructed values differ from those in pdfSrcField
+ reconstructInterfaceCellLegacy< LatticeModel_T >(flagField, pdfSrcFieldIt, flagFieldIt, normalFieldIt,
+ flagInfo, real_c(2), pdfDstFieldIt,
+ PdfReconstructionModel("OnlyMissing"));
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ // evaluate if the correct cells were reconstructed
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ const PdfField_T* const pdfSrcField = blockIt->getData< const PdfField_T >(pdfSrcFieldID);
+ const PdfField_T* const pdfDstField = blockIt->getData< const PdfField_T >(pdfDstFieldID);
+
+ WALBERLA_FOR_ALL_CELLS(
+ pdfSrcFieldIt, pdfSrcField, pdfDstFieldIt, pdfDstField, if (pdfSrcFieldIt.cell() == centralCell) {
+ // the boundary handling is not executed so the only change must be the PDF coming from the free-slip
+ // boundary cell that reflects the PDF from the gas cell
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[0], pdfDstFieldIt[0]); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[1], pdfDstFieldIt[1]); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[2], pdfDstFieldIt[2]); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[3], pdfDstFieldIt[3]); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[4], pdfDstFieldIt[4]); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[5], pdfDstFieldIt[5]); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[6], pdfDstFieldIt[6]); // NE, (1,1,0)
+
+ // this is the PDF that must be reconstructed due to having
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[7], pdfDstFieldIt[7]); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[8], pdfDstFieldIt[8]); // SE, (1,-1,0)
+ })
+ }
+
+ MPIManager::instance()->resetMPI();
+}
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+
+ runSimulation();
+
+ return EXIT_SUCCESS;
+}
+} // namespace PdfReconstructionFreeSlipTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::PdfReconstructionFreeSlipTest::main(argc, argv); }
\ No newline at end of file
diff --git a/tests/lbm/free_surface/dynamics/PdfReconstructionTest.cpp b/tests/lbm/free_surface/dynamics/PdfReconstructionTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..2638379cd25f67ed3343f462e21fda35d1127c69
--- /dev/null
+++ b/tests/lbm/free_surface/dynamics/PdfReconstructionTest.cpp
@@ -0,0 +1,606 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file PdfReconstructionTest.cpp
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Test PDF reconstruction at free surface boundary.
+//!
+//! Initialize 3x3 grid similar to figure 3 in publication of Koerner et al., 2005 and test reconstruction of PDFs at
+//! the free surface boundary with respect to the models specified in PdfReconstructionModel.h.
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+
+#include "field/FieldClone.h"
+
+#include "lbm/blockforest/communication/SimpleCommunication.h"
+#include "lbm/field/Adaptors.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface/boundary/FreeSurfaceBoundaryHandling.h"
+#include "lbm/free_surface/bubble_model/Geometry.h"
+#include "lbm/free_surface/dynamics/PdfReconstructionModel.h"
+#include "lbm/free_surface/dynamics/functionality/ReconstructInterfaceCellABB.h"
+#include "lbm/lattice_model/D2Q9.h"
+
+#include "timeloop/SweepTimeloop.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace PdfReconstructionTest
+{
+using LatticeModel_T = lbm::D2Q9< lbm::collision_model::SRT, true, lbm::force_model::None, 2 >;
+using Stencil = typename LatticeModel_T::Stencil;
+
+using Communication_T = blockforest::SimpleCommunication< LatticeModel_T::CommunicationStencil >;
+
+using PdfField_T = lbm::PdfField< LatticeModel_T >;
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+
+using flag_t = uint32_t;
+using FlagField_T = FlagField< flag_t >;
+using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+void runSimulation(const PdfReconstructionModel& pdfReconstructionModel)
+{
+ // define the domain size
+ const Vector3< uint_t > numBlocks(uint_c(1));
+ const Vector3< uint_t > domainSize(uint_c(3), uint_c(3), uint_c(1));
+ const Vector3< uint_t > cellsPerBlock(domainSize[0] / numBlocks[0], domainSize[1] / numBlocks[1],
+ domainSize[2] / numBlocks[2]);
+
+ // create block grid
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ blockforest::createUniformBlockGrid(numBlocks[0], numBlocks[1], numBlocks[2], // blocks
+ cellsPerBlock[0], cellsPerBlock[1], cellsPerBlock[2], // cells
+ real_c(1.0), // dx
+ true, // one block per process
+ false, false, false); // periodicity
+
+ // create (dummy) lattice model
+ LatticeModel_T latticeModel = LatticeModel_T(lbm::collision_model::SRT(real_c(1.8)));
+
+ // add pdf source and destination fields
+ const BlockDataID pdfSrcFieldID =
+ lbm::addPdfFieldToStorage(blockForest, "PDF source field", latticeModel, uint_c(0), field::fzyx);
+ const BlockDataID pdfDstFieldID =
+ lbm::addPdfFieldToStorage(blockForest, "PDF destination field", latticeModel, uint_c(0), field::fzyx);
+
+ // add normal field
+ const BlockDataID normalFieldID = field::addToStorage< VectorField_T >(
+ blockForest, "Normal field", Vector3< real_t >(real_c(0)), field::fzyx, uint_c(1));
+
+ // add fill level field (MUST be initialized with 1, i.e., fluid everywhere for this test; otherwise the fluid
+ // flag is not detected below by initFlagsFromFillLevel())
+ const BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill level field", real_c(1), field::fzyx, uint_c(1));
+
+ // central interface cell, in which the reconstruction and evaluation will be performed
+ const Cell centralCell = Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0));
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ ScalarField_T* const fillField = blockIt->getData< ScalarField_T >(fillFieldID);
+ VectorField_T* const normalField = blockIt->getData< VectorField_T >(normalFieldID);
+
+ WALBERLA_FOR_ALL_CELLS(fillFieldIt, fillField, normalFieldIt, normalField, {
+ // initialize gas cells as in figure 3 from Koerner et al., 2005
+ if (fillFieldIt.cell() == Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)) ||
+ fillFieldIt.cell() == Cell(cell_idx_c(1), cell_idx_c(0), cell_idx_c(0)) ||
+ fillFieldIt.cell() == Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(0)))
+ {
+ *fillFieldIt = real_c(0);
+ }
+
+ // initialize interface cells as in figure 3 from Koerner et al., 2005
+ if (fillFieldIt.cell() == Cell(cell_idx_c(2), cell_idx_c(0), cell_idx_c(0)) ||
+ fillFieldIt.cell() == Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)) ||
+ fillFieldIt.cell() == Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(0)) ||
+ fillFieldIt.cell() == Cell(cell_idx_c(0), cell_idx_c(2), cell_idx_c(0)) ||
+ fillFieldIt.cell() == Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(0)))
+ {
+ *fillFieldIt = real_c(0.5);
+ }
+
+ // initialize fluid cell as in figure 3 from Koerner et al., 2005
+ if (fillFieldIt.cell() == Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(0))) { *fillFieldIt = real_c(1); }
+
+ // initialize interface normal as in figure 3 from Koerner et al., 2005 (values estimated)
+ // IMPORTANT REMARK: In this waLBerla's free surface implementation, the normal is defined to point from fluid
+ // to gas, whereas in Koerner et al., the normal is defined to point from gas to fluid. Therefore, we
+ // initialize the normal in opposite direction than in figure 3.
+ if (normalFieldIt.cell() == centralCell)
+ {
+ *normalFieldIt = Vector3< real_t >(real_c(-0.83867), real_c(-0.54464), real_c(0));
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfSrcFieldID, fillFieldID);
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+
+ // initial communication
+ Communication_T(blockForest, pdfSrcFieldID, fillFieldID, flagFieldID)();
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, uint_c(1));
+
+ // perform reconstruction
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ const PdfField_T* const pdfSrcField = blockIt->getData< const PdfField_T >(pdfSrcFieldID);
+ PdfField_T* const pdfDstField = blockIt->getData< PdfField_T >(pdfDstFieldID);
+ const VectorField_T* const normalField = blockIt->getData< const VectorField_T >(normalFieldID);
+ const FlagField_T* const flagField = blockIt->getData< const FlagField_T >(flagFieldID);
+
+ WALBERLA_FOR_ALL_CELLS(
+ pdfSrcFieldIt, pdfSrcField, pdfDstFieldIt, pdfDstField, flagFieldIt, flagField, normalFieldIt, normalField, {
+ if (pdfSrcFieldIt.cell() == centralCell)
+ {
+ // reconstruct with rhoGas!=1 such that reconstructed values differ from those in pdfSrcField
+ reconstructInterfaceCellLegacy< LatticeModel_T >(flagField, pdfSrcFieldIt, flagFieldIt, normalFieldIt,
+ flagInfo, real_c(2), pdfDstFieldIt,
+ pdfReconstructionModel);
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ const PdfReconstructionModel::ReconstructionModel reconstructionModel = pdfReconstructionModel.getModelType();
+ const uint_t minReconstruct = pdfReconstructionModel.getNumMinReconstruct();
+ const PdfReconstructionModel::FallbackModel fallbackModel = pdfReconstructionModel.getFallbackModel();
+
+ // evaluate if the correct cells were reconstructed:
+ // 1. equality/ inequality between pdfSrc and pdfDst was verified manually, i.e., by hand
+ // 2. comparison with expected (reconstructed) values:
+ // - results only valid for rhoGas=2 (as specified above)
+ // - results obtained with a version that is believed to be correct
+ // - was included for detection of changes in PDF reconstruction boundary condition
+ // - makes 1. actually obsolete (1. was kept for as this is what the test was actually intended for, i.e., find
+ // out whether the correct PDFs are reconstructed)
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ const PdfField_T* const pdfSrcField = blockIt->getData< const PdfField_T >(pdfSrcFieldID);
+ const PdfField_T* const pdfDstField = blockIt->getData< const PdfField_T >(pdfDstFieldID);
+
+ WALBERLA_FOR_ALL_CELLS(pdfSrcFieldIt, pdfSrcField, pdfDstFieldIt, pdfDstField, {
+ if (pdfSrcFieldIt.cell() == centralCell)
+ {
+ if (reconstructionModel == PdfReconstructionModel::ReconstructionModel::NormalBasedKeepCenter ||
+ (reconstructionModel == PdfReconstructionModel::ReconstructionModel::OnlyMissingMin &&
+ minReconstruct > uint_c(3) &&
+ fallbackModel == PdfReconstructionModel::FallbackModel::NormalBasedKeepCenter))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[0], real_c(0.444444), real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[1], real_c(0.333333), real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[2], real_c(0.111111), real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[3], real_c(0.111111), real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[4], real_c(0.333333), real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[5], real_c(0.0277778), real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[6], real_c(0.0833333), real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[7], real_c(0.0277778), real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[8], real_c(0.0833333), real_c(1e-6)); // SE, (1,-1,0)
+
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[0], pdfDstFieldIt[0]); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[1], pdfDstFieldIt[1]); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[2], pdfDstFieldIt[2]); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[3], pdfDstFieldIt[3]); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[4], pdfDstFieldIt[4]); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[5], pdfDstFieldIt[5]); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[6], pdfDstFieldIt[6]); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[7], pdfDstFieldIt[7]); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[8], pdfDstFieldIt[8]); // SE, (1,-1,0)
+ }
+
+ if (reconstructionModel == PdfReconstructionModel::ReconstructionModel::NormalBasedReconstructCenter)
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[0], real_c(1.333333), real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[1], real_c(0.333333), real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[2], real_c(0.111111), real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[3], real_c(0.111111), real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[4], real_c(0.333333), real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[5], real_c(0.0277778), real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[6], real_c(0.0833333), real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[7], real_c(0.0277778), real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[8], real_c(0.0833333), real_c(1e-6)); // SE, (1,-1,0)
+
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[0], pdfDstFieldIt[0]); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[1], pdfDstFieldIt[1]); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[2], pdfDstFieldIt[2]); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[3], pdfDstFieldIt[3]); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[4], pdfDstFieldIt[4]); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[5], pdfDstFieldIt[5]); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[6], pdfDstFieldIt[6]); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[7], pdfDstFieldIt[7]); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[8], pdfDstFieldIt[8]); // SE, (1,-1,0)
+ }
+
+ if (reconstructionModel == PdfReconstructionModel::ReconstructionModel::All)
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[0], real_c(1.333333), real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[1], real_c(0.333333), real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[2], real_c(0.333333), real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[3], real_c(0.333333), real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[4], real_c(0.333333), real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[5], real_c(0.0833333), real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[6], real_c(0.0833333), real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[7], real_c(0.0833333), real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[8], real_c(0.0833333), real_c(1e-6)); // SE, (1,-1,0)
+
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[0], pdfDstFieldIt[0]); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[1], pdfDstFieldIt[1]); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[2], pdfDstFieldIt[2]); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[3], pdfDstFieldIt[3]); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[4], pdfDstFieldIt[4]); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[5], pdfDstFieldIt[5]); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[6], pdfDstFieldIt[6]); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[7], pdfDstFieldIt[7]); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[8], pdfDstFieldIt[8]); // SE, (1,-1,0)
+ }
+
+ // in the setup here, 3 PDFs will always be reconstructed as they are coming from the gas-side and are
+ // therefore missing
+ if (reconstructionModel == PdfReconstructionModel::ReconstructionModel::OnlyMissing ||
+ (reconstructionModel == PdfReconstructionModel::ReconstructionModel::OnlyMissingMin &&
+ (minReconstruct == uint_c(0) || minReconstruct == uint_c(1) || minReconstruct == uint_c(2) ||
+ minReconstruct == uint_c(3)) &&
+ (fallbackModel == PdfReconstructionModel::FallbackModel::Smallest ||
+ fallbackModel == PdfReconstructionModel::FallbackModel::Largest ||
+ fallbackModel == PdfReconstructionModel::FallbackModel::NormalBasedKeepCenter)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[0], real_c(0.444444), real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[1], real_c(0.333333), real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[2], real_c(0.111111), real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[3], real_c(0.111111), real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[4], real_c(0.333333), real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[5], real_c(0.0277778), real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[6], real_c(0.0833333), real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[7], real_c(0.0277778), real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[8], real_c(0.0277778), real_c(1e-6)); // SE, (1,-1,0)
+
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[0], pdfDstFieldIt[0]); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[1], pdfDstFieldIt[1]); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[2], pdfDstFieldIt[2]); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[3], pdfDstFieldIt[3]); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[4], pdfDstFieldIt[4]); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[5], pdfDstFieldIt[5]); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[6], pdfDstFieldIt[6]); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[7], pdfDstFieldIt[7]); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[8], pdfDstFieldIt[8]); // SE, (1,-1,0)
+ }
+
+ if (reconstructionModel == PdfReconstructionModel::ReconstructionModel::OnlyMissingMin &&
+ minReconstruct == uint_c(4) && fallbackModel == PdfReconstructionModel::FallbackModel::Smallest)
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[0], real_c(1.333333), real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[1], real_c(0.333333), real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[2], real_c(0.111111), real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[3], real_c(0.111111), real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[4], real_c(0.333333), real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[5], real_c(0.0277778), real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[6], real_c(0.0833333), real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[7], real_c(0.0277778), real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[8], real_c(0.0277778), real_c(1e-6)); // SE, (1,-1,0)
+
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[0], pdfDstFieldIt[0]); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[1], pdfDstFieldIt[1]); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[2], pdfDstFieldIt[2]); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[3], pdfDstFieldIt[3]); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[4], pdfDstFieldIt[4]); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[5], pdfDstFieldIt[5]); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[6], pdfDstFieldIt[6]); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[7], pdfDstFieldIt[7]); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[8], pdfDstFieldIt[8]); // SE, (1,-1,0)
+ }
+
+ if (reconstructionModel == PdfReconstructionModel::ReconstructionModel::OnlyMissingMin &&
+ minReconstruct == uint_c(4) && fallbackModel == PdfReconstructionModel::FallbackModel::Largest)
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[0], real_c(0.444444), real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[1], real_c(0.333333), real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[2], real_c(0.111111), real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[3], real_c(0.111111), real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[4], real_c(0.333333), real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[5], real_c(0.0277778), real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[6], real_c(0.0833333), real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[7], real_c(0.0833333), real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[8], real_c(0.0277778), real_c(1e-6)); // SE, (1,-1,0)
+
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[0], pdfDstFieldIt[0]); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[1], pdfDstFieldIt[1]); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[2], pdfDstFieldIt[2]); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[3], pdfDstFieldIt[3]); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[4], pdfDstFieldIt[4]); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[5], pdfDstFieldIt[5]); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[6], pdfDstFieldIt[6]); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[7], pdfDstFieldIt[7]); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[8], pdfDstFieldIt[8]); // SE, (1,-1,0)
+ }
+
+ if (reconstructionModel == PdfReconstructionModel::ReconstructionModel::OnlyMissingMin &&
+ minReconstruct == uint_c(5) && fallbackModel == PdfReconstructionModel::FallbackModel::Smallest)
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[0], real_c(1.333333), real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[1], real_c(0.333333), real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[2], real_c(0.111111), real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[3], real_c(0.111111), real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[4], real_c(0.333333), real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[5], real_c(0.0277778), real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[6], real_c(0.0833333), real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[7], real_c(0.0277778), real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[8], real_c(0.0833333), real_c(1e-6)); // SE, (1,-1,0)
+
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[0], pdfDstFieldIt[0]); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[1], pdfDstFieldIt[1]); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[2], pdfDstFieldIt[2]); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[3], pdfDstFieldIt[3]); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[4], pdfDstFieldIt[4]); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[5], pdfDstFieldIt[5]); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[6], pdfDstFieldIt[6]); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[7], pdfDstFieldIt[7]); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[8], pdfDstFieldIt[8]); // SE, (1,-1,0)
+ }
+
+ if (reconstructionModel == PdfReconstructionModel::ReconstructionModel::OnlyMissingMin &&
+ minReconstruct == uint_c(5) && fallbackModel == PdfReconstructionModel::FallbackModel::Largest)
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[0], real_c(0.444444), real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[1], real_c(0.333333), real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[2], real_c(0.111111), real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[3], real_c(0.333333), real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[4], real_c(0.333333), real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[5], real_c(0.0277778), real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[6], real_c(0.0833333), real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[7], real_c(0.0833333), real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[8], real_c(0.0277778), real_c(1e-6)); // SE, (1,-1,0)
+
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[0], pdfDstFieldIt[0]); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[1], pdfDstFieldIt[1]); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[2], pdfDstFieldIt[2]); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[3], pdfDstFieldIt[3]); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[4], pdfDstFieldIt[4]); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[5], pdfDstFieldIt[5]); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[6], pdfDstFieldIt[6]); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[7], pdfDstFieldIt[7]); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[8], pdfDstFieldIt[8]); // SE, (1,-1,0)
+ }
+
+ if (reconstructionModel == PdfReconstructionModel::ReconstructionModel::OnlyMissingMin &&
+ minReconstruct == uint_c(6) && fallbackModel == PdfReconstructionModel::FallbackModel::Smallest)
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[0], real_c(1.333333), real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[1], real_c(0.333333), real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[2], real_c(0.111111), real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[3], real_c(0.111111), real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[4], real_c(0.333333), real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[5], real_c(0.0833333), real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[6], real_c(0.0833333), real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[7], real_c(0.0277778), real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[8], real_c(0.0833333), real_c(1e-6)); // SE, (1,-1,0)
+
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[0], pdfDstFieldIt[0]); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[1], pdfDstFieldIt[1]); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[2], pdfDstFieldIt[2]); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[3], pdfDstFieldIt[3]); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[4], pdfDstFieldIt[4]); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[5], pdfDstFieldIt[5]); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[6], pdfDstFieldIt[6]); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[7], pdfDstFieldIt[7]); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[8], pdfDstFieldIt[8]); // SE, (1,-1,0)
+ }
+
+ if (reconstructionModel == PdfReconstructionModel::ReconstructionModel::OnlyMissingMin &&
+ minReconstruct == uint_c(6) && fallbackModel == PdfReconstructionModel::FallbackModel::Largest)
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[0], real_c(0.444444), real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[1], real_c(0.333333), real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[2], real_c(0.333333), real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[3], real_c(0.333333), real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[4], real_c(0.333333), real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[5], real_c(0.0277778), real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[6], real_c(0.0833333), real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[7], real_c(0.0833333), real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[8], real_c(0.0277778), real_c(1e-6)); // SE, (1,-1,0)
+
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[0], pdfDstFieldIt[0]); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[1], pdfDstFieldIt[1]); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[2], pdfDstFieldIt[2]); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[3], pdfDstFieldIt[3]); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[4], pdfDstFieldIt[4]); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[5], pdfDstFieldIt[5]); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[6], pdfDstFieldIt[6]); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[7], pdfDstFieldIt[7]); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[8], pdfDstFieldIt[8]); // SE, (1,-1,0)
+ }
+
+ if (reconstructionModel == PdfReconstructionModel::ReconstructionModel::OnlyMissingMin &&
+ minReconstruct == uint_c(7) && fallbackModel == PdfReconstructionModel::FallbackModel::Smallest)
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[0], real_c(1.333333), real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[1], real_c(0.333333), real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[2], real_c(0.333333), real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[3], real_c(0.111111), real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[4], real_c(0.333333), real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[5], real_c(0.0833333), real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[6], real_c(0.0833333), real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[7], real_c(0.0277778), real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[8], real_c(0.0833333), real_c(1e-6)); // SE, (1,-1,0)
+
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[0], pdfDstFieldIt[0]); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[1], pdfDstFieldIt[1]); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[2], pdfDstFieldIt[2]); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[3], pdfDstFieldIt[3]); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[4], pdfDstFieldIt[4]); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[5], pdfDstFieldIt[5]); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[6], pdfDstFieldIt[6]); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[7], pdfDstFieldIt[7]); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[8], pdfDstFieldIt[8]); // SE, (1,-1,0)
+ }
+
+ if (reconstructionModel == PdfReconstructionModel::ReconstructionModel::OnlyMissingMin &&
+ minReconstruct == uint_c(7) && fallbackModel == PdfReconstructionModel::FallbackModel::Largest)
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[0], real_c(0.444444), real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[1], real_c(0.333333), real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[2], real_c(0.333333), real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[3], real_c(0.333333), real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[4], real_c(0.333333), real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[5], real_c(0.0277778), real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[6], real_c(0.0833333), real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[7], real_c(0.0833333), real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[8], real_c(0.0833333), real_c(1e-6)); // SE, (1,-1,0)
+
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[0], pdfDstFieldIt[0]); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[1], pdfDstFieldIt[1]); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[2], pdfDstFieldIt[2]); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[3], pdfDstFieldIt[3]); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[4], pdfDstFieldIt[4]); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[5], pdfDstFieldIt[5]); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[6], pdfDstFieldIt[6]); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[7], pdfDstFieldIt[7]); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[8], pdfDstFieldIt[8]); // SE, (1,-1,0)
+ }
+
+ if (reconstructionModel == PdfReconstructionModel::ReconstructionModel::OnlyMissingMin &&
+ minReconstruct == uint_c(8) && fallbackModel == PdfReconstructionModel::FallbackModel::Smallest)
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[0], real_c(1.333333), real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[1], real_c(0.333333), real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[2], real_c(0.333333), real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[3], real_c(0.333333), real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[4], real_c(0.333333), real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[5], real_c(0.0833333), real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[6], real_c(0.0833333), real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[7], real_c(0.0277778), real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[8], real_c(0.0833333), real_c(1e-6)); // SE, (1,-1,0)
+
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[0], pdfDstFieldIt[0]); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[1], pdfDstFieldIt[1]); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[2], pdfDstFieldIt[2]); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[3], pdfDstFieldIt[3]); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[4], pdfDstFieldIt[4]); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[5], pdfDstFieldIt[5]); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[6], pdfDstFieldIt[6]); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[7], pdfDstFieldIt[7]); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[8], pdfDstFieldIt[8]); // SE, (1,-1,0)
+ }
+
+ if (reconstructionModel == PdfReconstructionModel::ReconstructionModel::OnlyMissingMin &&
+ minReconstruct == uint_c(8) && fallbackModel == PdfReconstructionModel::FallbackModel::Largest)
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[0], real_c(0.444444), real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[1], real_c(0.333333), real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[2], real_c(0.333333), real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[3], real_c(0.333333), real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[4], real_c(0.333333), real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[5], real_c(0.0833333), real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[6], real_c(0.0833333), real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[7], real_c(0.0833333), real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[8], real_c(0.0833333), real_c(1e-6)); // SE, (1,-1,0)
+
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfSrcFieldIt[0], pdfDstFieldIt[0]); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[1], pdfDstFieldIt[1]); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[2], pdfDstFieldIt[2]); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[3], pdfDstFieldIt[3]); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[4], pdfDstFieldIt[4]); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[5], pdfDstFieldIt[5]); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[6], pdfDstFieldIt[6]); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[7], pdfDstFieldIt[7]); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[8], pdfDstFieldIt[8]); // SE, (1,-1,0)
+ }
+
+ if (reconstructionModel == PdfReconstructionModel::ReconstructionModel::OnlyMissingMin &&
+ minReconstruct == uint_c(9) &&
+ (fallbackModel == PdfReconstructionModel::FallbackModel::Smallest ||
+ fallbackModel == PdfReconstructionModel::FallbackModel::Largest))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[0], real_c(1.333333), real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[1], real_c(0.333333), real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[2], real_c(0.333333), real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[3], real_c(0.333333), real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[4], real_c(0.333333), real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[5], real_c(0.0833333), real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[6], real_c(0.0833333), real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[7], real_c(0.0833333), real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfDstFieldIt[8], real_c(0.0833333), real_c(1e-6)); // SE, (1,-1,0)
+
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[0], pdfDstFieldIt[0]); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[1], pdfDstFieldIt[1]); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[2], pdfDstFieldIt[2]); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[3], pdfDstFieldIt[3]); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[4], pdfDstFieldIt[4]); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[5], pdfDstFieldIt[5]); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[6], pdfDstFieldIt[6]); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[7], pdfDstFieldIt[7]); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_UNEQUAL(pdfSrcFieldIt[8], pdfDstFieldIt[8]); // SE, (1,-1,0)
+ }
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ MPIManager::instance()->resetMPI();
+}
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+
+ PdfReconstructionModel model = PdfReconstructionModel("NormalBasedKeepCenter");
+ WALBERLA_LOG_INFO_ON_ROOT("Testing model " << model.getFullModelSpecification());
+ runSimulation(model);
+
+ model = PdfReconstructionModel("NormalBasedReconstructCenter");
+ WALBERLA_LOG_INFO_ON_ROOT("Testing model " << model.getFullModelSpecification());
+ runSimulation(model);
+
+ model = PdfReconstructionModel("All");
+ WALBERLA_LOG_INFO_ON_ROOT("Testing model " << model.getFullModelSpecification());
+ runSimulation(model);
+
+ model = PdfReconstructionModel("OnlyMissing");
+ WALBERLA_LOG_INFO_ON_ROOT("Testing model " << model.getFullModelSpecification());
+ runSimulation(model);
+
+ for (uint_t i = uint_c(0); i != uint_c(10); ++i)
+ {
+ model = PdfReconstructionModel("OnlyMissingMin-" + std::to_string(i) + "-smallest");
+ WALBERLA_LOG_INFO_ON_ROOT("Testing model " << model.getFullModelSpecification());
+ runSimulation(model);
+
+ model = PdfReconstructionModel("OnlyMissingMin-" + std::to_string(i) + "-largest");
+ WALBERLA_LOG_INFO_ON_ROOT("Testing model " << model.getFullModelSpecification());
+ runSimulation(model);
+
+ model = PdfReconstructionModel("OnlyMissingMin-" + std::to_string(i) + "-normalBasedKeepCenter");
+ WALBERLA_LOG_INFO_ON_ROOT("Testing model " << model.getFullModelSpecification());
+ runSimulation(model);
+ }
+
+ return EXIT_SUCCESS;
+}
+} // namespace PdfReconstructionTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::PdfReconstructionTest::main(argc, argv); }
\ No newline at end of file
diff --git a/tests/lbm/free_surface/dynamics/PdfRefillingTest.cpp b/tests/lbm/free_surface/dynamics/PdfRefillingTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..ae4ec83d12985f40aa95482eac3c2c6380d2884a
--- /dev/null
+++ b/tests/lbm/free_surface/dynamics/PdfRefillingTest.cpp
@@ -0,0 +1,1123 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file PdfRefillingTest.cpp
+//! \ingroup lbm/free_surface/dynamics
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \author Michael Zikeli
+//! \brief Test PDF refilling of gas cells that are converted to interface cells at the free surface boundary.
+//!
+//! For each test two helper functions are necessary, that are both passed in the main as callback functions
+//! - The initialization function which fills four sets (gasCells, interfaceCells, liquidCells, conversionCells).
+//! - The verification function, that checks whether the values are calculated correctly.
+//! The domain is consists of 5x3x1 cells with periodic boundaries. Different scenarios are tested. The expected
+//! solutions are obtained manually from the file "/tests/lbm/free_surface/dynamics/PdfRefillingTest.odp".
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+
+#include "lbm/blockforest/communication/SimpleCommunication.h"
+#include "lbm/field/Adaptors.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface/FlagInfo.h"
+#include "lbm/free_surface/boundary/FreeSurfaceBoundaryHandling.h"
+#include "lbm/free_surface/dynamics/PdfRefillingModel.h"
+#include "lbm/free_surface/dynamics/PdfRefillingSweep.h"
+#include "lbm/free_surface/surface_geometry/SurfaceGeometryHandler.h"
+#include "lbm/lattice_model/D2Q9.h"
+#include "lbm/sweeps/CellwiseSweep.h"
+
+#include "timeloop/SweepTimeloop.h"
+
+#include <functional>
+#include <iostream>
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace PdfRefillingTest
+{
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+
+using LatticeModel_T = lbm::D2Q9< lbm::collision_model::SRT, true, lbm::force_model::None, 2 >;
+using Stencil_T = typename LatticeModel_T::Stencil;
+
+using Communication_T = blockforest::SimpleCommunication< LatticeModel_T::CommunicationStencil >;
+
+using flag_t = uint32_t;
+using FlagField_T = field::FlagField< flag_t >;
+using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+using FlagInfo_T = FlagInfo< FlagField_T >;
+
+using PdfField_T = lbm::PdfField< LatticeModel_T >;
+
+using RefillingModel_T = PdfRefillingModel::RefillingModel;
+
+using initCallback_T =
+ std::function< void(std::set< Cell >&, std::set< Cell >&, std::set< Cell >&, std::set< Cell >&) >;
+using verifyCallback_T = std::function< void(const PdfRefillingModel&, const Cell&, const PdfField_T* const) >;
+
+void runSimulation(const PdfRefillingModel& pdfRefillingModel, const initCallback_T& fillInitializationSets,
+ const verifyCallback_T& verifyResults);
+
+/***********************************************************************************************************************
+ * Test: noRefillingCells
+ * | G | G | G | G | G | | G | G | G | G | G |
+ * | G | G | G | G | G | ==> | G | G | I | G | G |
+ * | G | G | G | G | G | | G | G | G | G | G |
+ **********************************************************************************************************************/
+void init_noRefillingCells(std::set< Cell >& gasCells, std::set< Cell >& interfaceCells, std::set< Cell >& liquidCells,
+ std::set< Cell >& conversionCells);
+void verify_noRefillingCells(const PdfRefillingModel& pdfRefillingModel, const Cell& cell,
+ const PdfField_T* const pdfField);
+
+/***********************************************************************************************************************
+ * Test: fullRefillingCells
+ * | I | I | I | I | I | | I | I | I | I | I |
+ * | I | G | I | I | I | ==> | I | I | I | I | I |
+ * | I | I | I | I | I | | I | I | I | I | I |
+ **********************************************************************************************************************/
+void init_fullRefillingCells(std::set< Cell >& gasCells, std::set< Cell >& interfaceCells,
+ std::set< Cell >& liquidCells, std::set< Cell >& conversionCells);
+void verify_fullRefillingCells(const PdfRefillingModel& pdfRefillingModel, const Cell& cell,
+ const PdfField_T* const pdfField);
+
+/***********************************************************************************************************************
+ * Test: someRefillingCells
+ * | G | I | I | I | I | | I | I | I | I | I |
+ * | G | G | I | I | I | ==> | G | I | I | I | I |
+ * | G | G | G | I | I | | G | G | I | I | I |
+ **********************************************************************************************************************/
+void init_someRefillingCells(std::set< Cell >& gasCells, std::set< Cell >& interfaceCells,
+ std::set< Cell >& liquidCells, std::set< Cell >& conversionCells);
+void verify_someRefillingCells(PdfRefillingModel const& pdfRefillingModel, Cell const& cell,
+ PdfField_T const* const pdfField);
+
+/***********************************************************************************************************************
+ * Test: straightRefillingCells
+ * | G | G | I | I | I | | G | G | I | I | I |
+ * | G | G | I | I | I | ==> | G | I | I | I | I |
+ * | G | G | I | I | I | | G | G | I | I | I |
+ **********************************************************************************************************************/
+void init_straightRefillingCells(std::set< Cell >& gasCells, std::set< Cell >& interfaceCells,
+ std::set< Cell >& liquidCells, std::set< Cell >& conversionCells);
+void verify_straightRefillingCells(const PdfRefillingModel& pdfRefillingModel, const Cell& cell,
+ const PdfField_T* const pdfField);
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+
+ for (auto modelType : PdfRefillingModel::getTypeIterator())
+ {
+ PdfRefillingModel model = PdfRefillingModel(modelType);
+
+ WALBERLA_LOG_INFO_ON_ROOT("Testing model:" << model.getFullModelSpecification()
+ << " with setup \"noRefillingCells\":"
+ << "\n\t | G | G | G | G | G | | G | G | G | G | G | "
+ << "\n\t | G | G | G | G | G | ==> | G | G | I | G | G | "
+ << "\n\t | G | G | G | G | G | | G | G | G | G | G | \n");
+ runSimulation(model, &init_noRefillingCells, &verify_noRefillingCells);
+
+ WALBERLA_LOG_INFO_ON_ROOT("Testing model:" << model.getFullModelSpecification()
+ << " with setup \"fullRefillingCells\":"
+ << "\n\t | I | I | I | I | I | | I | I | I | I | I | "
+ << "\n\t | I | G | I | I | I | ==> | I | I | I | I | I | "
+ << "\n\t | I | I | I | I | I | | I | I | I | I | I | \n");
+ runSimulation(model, init_fullRefillingCells, verify_fullRefillingCells);
+
+ WALBERLA_LOG_INFO_ON_ROOT("Testing model:" << model.getFullModelSpecification()
+ << " with setup \"someRefillingCells\":"
+ << "\n\t | G | I | I | I | I | | I | I | I | I | I | "
+ << "\n\t | G | G | I | I | I | ==> | G | I | I | I | I | "
+ << "\n\t | G | G | G | I | I | | G | G | I | I | I | \n");
+ runSimulation(model, &init_someRefillingCells, &verify_someRefillingCells);
+
+ WALBERLA_LOG_INFO_ON_ROOT("Testing model:" << model.getFullModelSpecification()
+ << " with setup \"straightRefillingCells\":"
+ << "\n\t | G | G | I | I | I | | G | G | I | I | I | "
+ << "\n\t | G | G | I | I | I | ==> | G | I | I | I | I | "
+ << "\n\t | G | G | I | I | I | | G | G | I | I | I | \n");
+ runSimulation(model, &init_straightRefillingCells, &verify_straightRefillingCells);
+ }
+
+ return EXIT_SUCCESS;
+}
+
+void init_noRefillingCells(std::set< Cell >& gasCells, std::set< Cell >& interfaceCells, std::set< Cell >& liquidCells,
+ std::set< Cell >& conversionCells)
+{
+ gasCells = std::set< Cell >(
+ { Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)), Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(0), cell_idx_c(2), cell_idx_c(0)), Cell(cell_idx_c(1), cell_idx_c(0), cell_idx_c(0)),
+ Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)), Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(0)),
+ Cell(cell_idx_c(2), cell_idx_c(0), cell_idx_c(0)), Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(0)), Cell(cell_idx_c(3), cell_idx_c(0), cell_idx_c(0)),
+ Cell(cell_idx_c(3), cell_idx_c(1), cell_idx_c(0)), Cell(cell_idx_c(3), cell_idx_c(2), cell_idx_c(0)),
+ Cell(cell_idx_c(4), cell_idx_c(0), cell_idx_c(0)), Cell(cell_idx_c(4), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(4), cell_idx_c(2), cell_idx_c(0)) });
+
+ interfaceCells = std::set< Cell >({});
+
+ liquidCells = std::set< Cell >({});
+
+ conversionCells = std::set< Cell >({ Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(0)) });
+}
+
+void init_fullRefillingCells(std::set< Cell >& gasCells, std::set< Cell >& interfaceCells,
+ std::set< Cell >& liquidCells, std::set< Cell >& conversionCells)
+{
+ gasCells = std::set< Cell >({ Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)) });
+
+ interfaceCells = std::set< Cell >(
+ { Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)), Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(0), cell_idx_c(2), cell_idx_c(0)), Cell(cell_idx_c(1), cell_idx_c(0), cell_idx_c(0)),
+ Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(0)), Cell(cell_idx_c(2), cell_idx_c(0), cell_idx_c(0)),
+ Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(0)), Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(0)),
+ Cell(cell_idx_c(3), cell_idx_c(0), cell_idx_c(0)), Cell(cell_idx_c(3), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(3), cell_idx_c(2), cell_idx_c(0)), Cell(cell_idx_c(4), cell_idx_c(0), cell_idx_c(0)),
+ Cell(cell_idx_c(4), cell_idx_c(1), cell_idx_c(0)), Cell(cell_idx_c(4), cell_idx_c(2), cell_idx_c(0)) });
+
+ liquidCells = std::set< Cell >({});
+
+ conversionCells = std::set< Cell >({ Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)) });
+}
+
+void init_someRefillingCells(std::set< Cell >& gasCells, std::set< Cell >& interfaceCells,
+ std::set< Cell >& liquidCells, std::set< Cell >& conversionCells)
+{
+ gasCells = std::set< Cell >(
+ { Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)), Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(1), cell_idx_c(0), cell_idx_c(0)), Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(0), cell_idx_c(2), cell_idx_c(0)), Cell(cell_idx_c(2), cell_idx_c(0), cell_idx_c(0)) });
+
+ interfaceCells = std::set< Cell >(
+ { Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(0)), Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(0)), Cell(cell_idx_c(3), cell_idx_c(0), cell_idx_c(0)),
+ Cell(cell_idx_c(3), cell_idx_c(1), cell_idx_c(0)), Cell(cell_idx_c(3), cell_idx_c(2), cell_idx_c(0)),
+ Cell(cell_idx_c(4), cell_idx_c(0), cell_idx_c(0)), Cell(cell_idx_c(4), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(4), cell_idx_c(2), cell_idx_c(0)) });
+
+ liquidCells = std::set< Cell >({});
+
+ conversionCells = std::set< Cell >({ Cell(cell_idx_c(0), cell_idx_c(2), cell_idx_c(0)),
+ Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(2), cell_idx_c(0), cell_idx_c(0)) });
+}
+
+void init_straightRefillingCells(std::set< Cell >& gasCells, std::set< Cell >& interfaceCells,
+ std::set< Cell >& liquidCells, std::set< Cell >& conversionCells)
+{
+ gasCells = std::set< Cell >(
+ { Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(0)), Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(0), cell_idx_c(2), cell_idx_c(0)), Cell(cell_idx_c(1), cell_idx_c(0), cell_idx_c(0)),
+ Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)), Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(0)) });
+
+ interfaceCells = std::set< Cell >(
+ { Cell(cell_idx_c(2), cell_idx_c(0), cell_idx_c(0)), Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(0)), Cell(cell_idx_c(3), cell_idx_c(0), cell_idx_c(0)),
+ Cell(cell_idx_c(3), cell_idx_c(1), cell_idx_c(0)), Cell(cell_idx_c(3), cell_idx_c(2), cell_idx_c(0)),
+ Cell(cell_idx_c(4), cell_idx_c(0), cell_idx_c(0)), Cell(cell_idx_c(4), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(4), cell_idx_c(2), cell_idx_c(0)) });
+
+ liquidCells = std::set< Cell >({});
+
+ conversionCells = std::set< Cell >({ Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)) });
+}
+
+void verify_noRefillingCells(const PdfRefillingModel& pdfRefillingModel, const Cell& cell,
+ const PdfField_T* const pdfField)
+{
+ switch (pdfRefillingModel.getModelType())
+ {
+ case RefillingModel_T::EquilibriumRefilling:
+ case RefillingModel_T::AverageRefilling:
+ case RefillingModel_T::EquilibriumAndNonEquilibriumRefilling:
+ case RefillingModel_T::ExtrapolationRefilling:
+ case RefillingModel_T::GradsMomentsRefilling:
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 0), real_c(0.444444444444444),
+ real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 1), real_c(0.111111111111111),
+ real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 2), real_c(0.111111111111111),
+ real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 3), real_c(0.111111111111111),
+ real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 4), real_c(0.111111111111111),
+ real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 5), real_c(0.027777777777778),
+ real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 6), real_c(0.027777777777778),
+ real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 7), real_c(0.027777777777778),
+ real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 8), real_c(0.027777777777778),
+ real_c(1e-6)); // SE, (1,-1,0)
+ break;
+ default:
+ WALBERLA_ABORT("The specified PDF refilling model " << pdfRefillingModel.getModelName()
+ << " is not available.\nSomething went wrong!");
+ }
+}
+
+void verify_fullRefillingCells(const PdfRefillingModel& pdfRefillingModel, const Cell& cell,
+ const PdfField_T* const pdfField)
+{
+ switch (pdfRefillingModel.getModelType())
+ {
+ case RefillingModel_T::EquilibriumRefilling:
+ case RefillingModel_T::EquilibriumAndNonEquilibriumRefilling:
+ case RefillingModel_T::ExtrapolationRefilling:
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(0)), real_c(0.443017361111111),
+ real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(1)), real_c(0.101584288194444),
+ real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(2)), real_c(0.120750954861111),
+ real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(3)), real_c(0.099328038194445),
+ real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(4)), real_c(0.123494704861111),
+ real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(5)), real_c(0.022800043402778),
+ real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(6)), real_c(0.028320616319445),
+ real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(7)), real_c(0.027070616319445),
+ real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(8)), real_c(0.033633376736111),
+ real_c(1e-6)); // SE, (1,-1,0)
+ break;
+ case RefillingModel_T::AverageRefilling:
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 0), real_c(0.440902777777778),
+ real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 1), real_c(0.102829861111111),
+ real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 2), real_c(0.119496527777777),
+ real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 3), real_c(0.097361111111111),
+ real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 4), real_c(0.122777777777778),
+ real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 5), real_c(0.022803819444445),
+ real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 6), real_c(0.029470486111111),
+ real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 7), real_c(0.030095486111111),
+ real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 8), real_c(0.034262152777778),
+ real_c(1e-6)); // SE, (1,-1,0)
+ break;
+ case RefillingModel_T::GradsMomentsRefilling:
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 0), real_c(0.449190200617283),
+ real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 1), real_c(0.098497868441358),
+ real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 2), real_c(0.117664535108025),
+ real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 3), real_c(0.100871248070988),
+ real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 4), real_c(0.125037914737654),
+ real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 5), real_c(0.024343253279321),
+ real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 6), real_c(0.025234196566358),
+ real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 7), real_c(0.023984196566358),
+ real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 8), real_c(0.035176586612654),
+ real_c(1e-6)); // SE, (1,-1,0)
+ break;
+ default:
+ WALBERLA_ABORT("The specified PDF refilling model " << pdfRefillingModel.getModelName()
+ << " is not available.\nSomething went wrong!");
+ }
+}
+
+void verify_someRefillingCells(const PdfRefillingModel& pdfRefillingModel, const Cell& cell,
+ const PdfField_T* const pdfField)
+{
+ switch (pdfRefillingModel.getModelType())
+ {
+ case RefillingModel_T::EquilibriumRefilling:
+ if (cell.x() == cell_idx_c(1) && cell.y() == cell_idx_c(1) && cell.z() == cell_idx_c(0))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(0)), real_c(0.443777777777778),
+ real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(1)), real_c(0.107661111111111),
+ real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(2)), real_c(0.114327777777778),
+ real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(3)), real_c(0.101394444444444),
+ real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(4)), real_c(0.121394444444444),
+ real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(5)), real_c(0.024602777777778),
+ real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(6)), real_c(0.029452777777778),
+ real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(7)), real_c(0.026119444444445),
+ real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(8)), real_c(0.031269444444445),
+ real_c(1e-6)); // SE, (1,-1,0)
+ }
+ else
+ {
+ if (cell.x() == cell_idx_c(0) && cell.y() == cell_idx_c(2) && cell.z() == cell_idx_c(0))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(0)), real_c(0.443506944444444),
+ real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(1)), real_c(0.103629861111111),
+ real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(2)), real_c(0.118629861111111),
+ real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(3)), real_c(0.101326736111111),
+ real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(4)), real_c(0.121326736111111),
+ real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(5)), real_c(0.023688715277778),
+ real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(6)), real_c(0.028351215277778),
+ real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(7)), real_c(0.027101215277778),
+ real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(8)), real_c(0.032438715277778),
+ real_c(1e-6)); // SE, (1,-1,0)
+ }
+ else
+ {
+ if (cell.x() == cell_idx_c(2) && cell.y() == cell_idx_c(0) && cell.z() == cell_idx_c(0))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(0)), real_c(0.44262037037037),
+ real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(1)), real_c(0.104188425925926),
+ real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(2)), real_c(0.117521759259259),
+ real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(3)), real_c(0.095712037037037),
+ real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(4)), real_c(0.127934259259259),
+ real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(5)), real_c(0.022553009259259),
+ real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(6)), real_c(0.030125231481482),
+ real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(7)), real_c(0.025403009259259),
+ real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(8)), real_c(0.033941898148148),
+ real_c(1e-6)); // SE, (1,-1,0)
+ }
+ else { WALBERLA_ABORT("The cells that need refilling are not set correctly."); }
+ }
+ }
+ break;
+ case RefillingModel_T::AverageRefilling:
+ if (cell.x() == cell_idx_c(1) && cell.y() == cell_idx_c(1) && cell.z() == cell_idx_c(0))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 0), real_c(0.441666666666667),
+ real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 1), real_c(0.110416666666666),
+ real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 2), real_c(0.110416666666666),
+ real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 3), real_c(0.095833333333333),
+ real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 4), real_c(0.119166666666667),
+ real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 5), real_c(0.023958333333333),
+ real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 6), real_c(0.032291666666667),
+ real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 7), real_c(0.033958333333333),
+ real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 8), real_c(0.032291666666667),
+ real_c(1e-6)); // SE, (1,-1,0)
+ }
+ else if (cell.x() == cell_idx_c(0) && cell.y() == cell_idx_c(2) && cell.z() == cell_idx_c(0))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 0), real_c(0.441111111111111),
+ real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 1), real_c(0.099340277777778),
+ real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 2), real_c(0.116840277777778),
+ real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 3), real_c(0.098715277777778),
+ real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 4), real_c(0.108715277777778),
+ real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 5), real_c(0.022256944444444),
+ real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 6), real_c(0.042881944444445),
+ real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 7), real_c(0.035381944444445),
+ real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 8), real_c(0.034756944444445),
+ real_c(1e-6)); // SE, (1,-1,0)
+ }
+ else if (cell.x() == cell_idx_c(2) && cell.y() == cell_idx_c(0) && cell.z() == cell_idx_c(0))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 0), real_c(0.44),
+ real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 1), real_c(0.102708333333333),
+ real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 2), real_c(0.109375),
+ real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 3), real_c(0.092847222222222),
+ real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 4), real_c(0.126736111111111),
+ real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 5), real_c(0.021805555555556),
+ real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 6), real_c(0.035694444444445),
+ real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 7), real_c(0.035138888888889),
+ real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 8), real_c(0.035694444444445),
+ real_c(1e-6)); // SE, (1,-1,0)
+ }
+ else { WALBERLA_ABORT("The cells that need refilling are not set correctly!"); }
+ break;
+ case RefillingModel_T::EquilibriumAndNonEquilibriumRefilling:
+ if (cell.x() == cell_idx_c(1) && cell.y() == cell_idx_c(1) && cell.z() == cell_idx_c(0))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(0)), real_c(0.452777777777777),
+ real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(1)), real_c(0.144811111111111),
+ real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(2)), real_c(0.101477777777778),
+ real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(3)), real_c(0.051994444444444),
+ real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(4)), real_c(0.111994444444444),
+ real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(5)), real_c(0.021427777777778),
+ real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(6)), real_c(0.020377777777778),
+ real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(7)), real_c(0.062044444444445),
+ real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(8)), real_c(0.033094444444445),
+ real_c(1e-6)); // SE, (1,-1,0)
+ }
+ else
+ {
+ if (cell.x() == cell_idx_c(0) && cell.y() == cell_idx_c(2) && cell.z() == cell_idx_c(0))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(0)), real_c(0.443506944444444),
+ real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(1)), real_c(0.103629861111111),
+ real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(2)), real_c(0.118629861111111),
+ real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(3)), real_c(0.101326736111111),
+ real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(4)), real_c(0.121326736111111),
+ real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(5)), real_c(0.023688715277778),
+ real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(6)), real_c(0.028351215277778),
+ real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(7)), real_c(0.027101215277778),
+ real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(8)), real_c(0.032438715277778),
+ real_c(1e-6)); // SE, (1,-1,0)
+ }
+ else
+ {
+ if (cell.x() == cell_idx_c(2) && cell.y() == cell_idx_c(0) && cell.z() == cell_idx_c(0))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(0)), real_c(0.43522037037037),
+ real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(1)), real_c(0.112788425925926),
+ real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(2)), real_c(0.046121759259259),
+ real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(3)), real_c(0.078962037037037),
+ real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(4)), real_c(0.181184259259259),
+ real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(5)), real_c(0.021353009259259),
+ real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(6)), real_c(0.008175231481481),
+ real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(7)), real_c(0.078453009259259),
+ real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(8)), real_c(0.037741898148148),
+ real_c(1e-6)); // SE, (1,-1,0)
+ }
+ else { WALBERLA_ABORT("The cells that need refilling are not set correctly!"); }
+ }
+ }
+ break;
+ case RefillingModel_T::ExtrapolationRefilling:
+ if (cell.x() == cell_idx_c(1) && cell.y() == cell_idx_c(1) && cell.z() == cell_idx_c(0))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 0), real_c(0.452777777777777),
+ real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 1), real_c(0.141527777777778),
+ real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 2), real_c(0.104861111111111),
+ real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 3), real_c(0.128611111111111),
+ real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 4), real_c(0.035277777777778),
+ real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 5), real_c(0.037986111111111),
+ real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 6), real_c(0.002152777777778),
+ real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 7), real_c(0.083819444444445),
+ real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 8), real_c(0.012986111111111),
+ real_c(1e-6)); // SE, (1,-1,0)
+ }
+ else
+ {
+ if (cell.x() == cell_idx_c(0) && cell.y() == cell_idx_c(2) && cell.z() == cell_idx_c(0))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(0)), real_c(0.443506944444444),
+ real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(1)), real_c(0.103629861111111),
+ real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(2)), real_c(0.118629861111111),
+ real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(3)), real_c(0.101326736111111),
+ real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(4)), real_c(0.121326736111111),
+ real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(5)), real_c(0.023688715277778),
+ real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(6)), real_c(0.028351215277778),
+ real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(7)), real_c(0.027101215277778),
+ real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(8)), real_c(0.032438715277778),
+ real_c(1e-6)); // SE, (1,-1,0)
+ }
+ else
+ {
+ if (cell.x() == cell_idx_c(2) && cell.y() == cell_idx_c(0) && cell.z() == cell_idx_c(0))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(0)), real_c(0.429444444444444),
+ real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(1)), real_c(0.076527777777778),
+ real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(2)), real_c(0.083194444444444),
+ real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(3)), real_c(0.066111111111111),
+ real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(4)), real_c(0.196111111111111),
+ real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(5)), real_c(0.011319444444444),
+ real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(6)), real_c(0.001319444444444),
+ real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(7)), real_c(0.082986111111111),
+ real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(8)), real_c(0.052986111111111),
+ real_c(1e-6)); // SE, (1,-1,0)
+ }
+ else { WALBERLA_ABORT("The cells that need refilling are not set correctly!"); }
+ }
+ }
+ break;
+ case RefillingModel_T::GradsMomentsRefilling:
+ if (cell.x() == cell_idx_c(1) && cell.y() == cell_idx_c(1) && cell.z() == cell_idx_c(0))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 0), real_c(0.46353086419753),
+ real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 1), real_c(0.110747530864197),
+ real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 2), real_c(0.117414197530864),
+ real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 3), real_c(0.09336975308642),
+ real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 4), real_c(0.11336975308642),
+ real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 5), real_c(0.023522530864198),
+ real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 6), real_c(0.02559475308642),
+ real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 7), real_c(0.022261419753087),
+ real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 8), real_c(0.030189197530864),
+ real_c(1e-6)); // SE, (1,-1,0)
+ }
+ else
+ {
+ if (cell.x() == cell_idx_c(0) && cell.y() == cell_idx_c(2) && cell.z() == cell_idx_c(0))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(0)), real_c(0.443506944444444),
+ real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(1)), real_c(0.103629861111111),
+ real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(2)), real_c(0.118629861111111),
+ real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(3)), real_c(0.101326736111111),
+ real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(4)), real_c(0.121326736111111),
+ real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(5)), real_c(0.022994270833333),
+ real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(6)), real_c(0.029045659722222),
+ real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(7)), real_c(0.027795659722222),
+ real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(8)), real_c(0.031744270833333),
+ real_c(1e-6)); // SE, (1,-1,0)
+ }
+ else
+ {
+ if (cell.x() == cell_idx_c(2) && cell.y() == cell_idx_c(0) && cell.z() == cell_idx_c(0))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(0)), real_c(0.454143004115226),
+ real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(1)), real_c(0.104291306584362),
+ real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(2)), real_c(0.117624639917695),
+ real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(3)), real_c(0.092728497942387),
+ real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(4)), real_c(0.124950720164609),
+ real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(5)), real_c(0.02389045781893),
+ real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(6)), real_c(0.025907124485597),
+ real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(7)), real_c(0.021184902263375),
+ real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(8)), real_c(0.035279346707819),
+ real_c(1e-6)); // SE, (1,-1,0)
+ }
+ else { WALBERLA_ABORT("The cells that need refilling are not set correctly!"); }
+ }
+ }
+ break;
+ default:
+ WALBERLA_ABORT("The specified PDF refilling model " << pdfRefillingModel.getModelName()
+ << " is not available.\nSomething went wrong!");
+ }
+}
+
+void verify_straightRefillingCells(const PdfRefillingModel& pdfRefillingModel, const Cell& cell,
+ const PdfField_T* const pdfField)
+{
+ switch (pdfRefillingModel.getModelType())
+ {
+ case RefillingModel_T::EquilibriumRefilling:
+ if (cell.x() == cell_idx_c(1) && cell.y() == cell_idx_c(1) && cell.z() == cell_idx_c(0))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(0)), real_c(0.444259259259259),
+ real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(1)), real_c(0.107781481481481),
+ real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(2)), real_c(0.114448148148148),
+ real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(3)), real_c(0.106709259259259),
+ real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(4)), real_c(0.115598148148148),
+ real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(5)), real_c(0.025889814814815),
+ real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(6)), real_c(0.02804537037037),
+ real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(7)), real_c(0.027489814814815),
+ real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(8)), real_c(0.029778703703704),
+ real_c(1e-6)); // SE, (1,-1,0)
+ }
+ else { WALBERLA_ABORT("The cells that need refilling are not set correctly!"); }
+ break;
+ case RefillingModel_T::AverageRefilling:
+ if (cell.x() == cell_idx_c(1) && cell.y() == cell_idx_c(1) && cell.z() == cell_idx_c(0))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 0), real_c(0.442222222222222),
+ real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 1), real_c(0.110555555555555),
+ real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 2), real_c(0.110555555555555),
+ real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 3), real_c(0.101111111111111),
+ real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 4), real_c(0.113333333333333),
+ real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 5), real_c(0.025277777777778),
+ real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 6), real_c(0.030833333333333),
+ real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 7), real_c(0.035277777777778),
+ real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, 8), real_c(0.030833333333333),
+ real_c(1e-6)); // SE, (1,-1,0)
+ }
+ else { WALBERLA_ABORT("The cells that need refilling are not set correctly!"); }
+ break;
+ case RefillingModel_T::EquilibriumAndNonEquilibriumRefilling:
+ if (cell.x() == cell_idx_c(1) && cell.y() == cell_idx_c(1) && cell.z() == cell_idx_c(0))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(0)), real_c(0.449659259259259),
+ real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(1)), real_c(0.10168148148148),
+ real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(2)), real_c(0.188348148148148),
+ real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(3)), real_c(0.121459259259259),
+ real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(4)), real_c(0.060348148148148),
+ real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(5)), real_c(0.027489814814815),
+ real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(6)), real_c(0.050095370370371),
+ real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(7)), real_c(-0.025460185185185),
+ real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(8)), real_c(0.026378703703704),
+ real_c(1e-6)); // SE, (1,-1,0)
+ }
+ else { WALBERLA_ABORT("The cells that need refilling are not set correctly!"); }
+ break;
+ case RefillingModel_T::ExtrapolationRefilling:
+ if (cell.x() == cell_idx_c(1) && cell.y() == cell_idx_c(1) && cell.z() == cell_idx_c(0))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(0)), real_c(0.441111111111112),
+ real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(1)), real_c(0.128194444444443),
+ real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(2)), real_c(0.154861111111111),
+ real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(3)), real_c(0.094861111111111),
+ real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(4)), real_c(0.098194444444445),
+ real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(5)), real_c(0.025694444444445),
+ real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(6)), real_c(0.069027777777778),
+ real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(7)), real_c(-0.037638888888889),
+ real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(8)), real_c(0.025694444444444),
+ real_c(1e-6)); // SE, (1,-1,0)
+ }
+ else { WALBERLA_ABORT("The cells that need refilling are not set correctly!"); }
+ break;
+ case RefillingModel_T::GradsMomentsRefilling:
+ if (cell.x() == cell_idx_c(1) && cell.y() == cell_idx_c(1) && cell.z() == cell_idx_c(0))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(0)), real_c(0.465658436213991),
+ real_c(1e-6)); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(1)), real_c(0.113131275720165),
+ real_c(1e-6)); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(2)), real_c(0.119797942386831),
+ real_c(1e-6)); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(3)), real_c(0.096009670781893),
+ real_c(1e-6)); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(4)), real_c(0.104898559670782),
+ real_c(1e-6)); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(5)), real_c(0.023677880658436),
+ real_c(1e-6)); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(6)), real_c(0.024907510288066),
+ real_c(1e-6)); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(7)), real_c(0.02435195473251),
+ real_c(1e-6)); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(pdfField->get(cell, cell_idx_c(8)), real_c(0.027566769547325),
+ real_c(1e-6)); // SE, (1,-1,0)
+ }
+ else { WALBERLA_ABORT("The cells that need refilling are not set correctly!"); }
+ break;
+ default:
+ WALBERLA_ABORT("The specified PDF refilling model " << pdfRefillingModel.getModelName()
+ << " is not available.\nSomething went wrong!");
+ }
+}
+
+void runSimulation(const PdfRefillingModel& pdfRefillingModel, const initCallback_T& fillInitializationSets,
+ const verifyCallback_T& verifyResults)
+{
+ // define the domain size (5x3x1)
+ const Vector3< uint_t > numBlocks(uint_c(1));
+ const Vector3< uint_t > domainSize(uint_c(5), uint_c(3), uint_c(1));
+ const Vector3< uint_t > cellsPerBlock(domainSize[0] / numBlocks[0], domainSize[1] / numBlocks[1],
+ domainSize[2] / numBlocks[2]);
+
+ // create block grid
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ blockforest::createUniformBlockGrid(numBlocks[0], numBlocks[1], numBlocks[2], // blocks
+ cellsPerBlock[0], cellsPerBlock[1], cellsPerBlock[2], // cells
+ real_c(1.0), // dx
+ true, // one block per process
+ true, true, false); // periodicity
+
+ // relaxation rate (used by GradsMomentsRefilling)
+ real_t omega = real_c(1.8);
+
+ // create lattice model
+ LatticeModel_T latticeModel = LatticeModel_T(lbm::collision_model::SRT(omega));
+
+ // add PDF field (and a copy that stores the original PDF field)
+ const BlockDataID pdfFieldID =
+ lbm::addPdfFieldToStorage(blockForest, "PDF source field", latticeModel, uint_c(1), field::fzyx);
+
+ // field to store PDFs before refilling, i.e., to test if non-refilling cells are modified
+ const BlockDataID pdfOrgFieldID =
+ lbm::addPdfFieldToStorage(blockForest, "PDF destination field", latticeModel, uint_c(1), field::fzyx);
+
+ // add fill level field (MUST be initialized with 1, i.e., fluid everywhere for this test; otherwise the fluid
+ // flag is not detected below by initFlagsFromFillLevel())
+ BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill level field", real_c(1), field::fzyx, uint_c(1));
+
+ // define the initial properties of the cells ( gas, liquid, interface )
+ std::set< Cell > gasCells;
+ std::set< Cell > interfaceCells;
+ std::set< Cell > liquidCells;
+ std::set< Cell > conversionCells;
+ fillInitializationSets(gasCells, interfaceCells, liquidCells, conversionCells);
+
+ real_t initDensity = real_c(1.0);
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ ScalarField_T* const fillField = blockIt->getData< ScalarField_T >(fillFieldID);
+ PdfField_T* const pdfField = blockIt->getData< PdfField_T >(pdfFieldID);
+ PdfField_T* pdfOrgField = blockIt->getData< PdfField_T >(pdfOrgFieldID);
+
+ std::vector< std::pair< Cell, Vector3< real_t > > > velocities = {
+ { Cell{ cell_idx_c(0), cell_idx_c(0), cell_idx_c(0) },
+ Vector3< real_t >{ real_c(0.05), real_c(-0.10), real_c(0.00) } },
+ { Cell{ cell_idx_c(1), cell_idx_c(0), cell_idx_c(0) },
+ Vector3< real_t >{ real_c(0.00), real_c(-0.05), real_c(0.00) } },
+ { Cell{ cell_idx_c(2), cell_idx_c(0), cell_idx_c(0) },
+ Vector3< real_t >{ real_c(0.00), real_c(0.00), real_c(0.00) } },
+ { Cell{ cell_idx_c(3), cell_idx_c(0), cell_idx_c(0) },
+ Vector3< real_t >{ real_c(0.05), real_c(-0.10), real_c(0.00) } },
+ { Cell{ cell_idx_c(4), cell_idx_c(0), cell_idx_c(0) },
+ Vector3< real_t >{ real_c(0.00), real_c(-0.05), real_c(0.00) } },
+ { Cell{ cell_idx_c(0), cell_idx_c(1), cell_idx_c(0) },
+ Vector3< real_t >{ real_c(0.10), real_c(-0.05), real_c(0.00) } },
+ { Cell{ cell_idx_c(1), cell_idx_c(1), cell_idx_c(0) },
+ Vector3< real_t >{ real_c(0.05), real_c(-0.10), real_c(0.00) } },
+ { Cell{ cell_idx_c(2), cell_idx_c(1), cell_idx_c(0) },
+ Vector3< real_t >{ real_c(0.10), real_c(0.00), real_c(0.00) } },
+ { Cell{ cell_idx_c(3), cell_idx_c(1), cell_idx_c(0) },
+ Vector3< real_t >{ real_c(0.10), real_c(-0.05), real_c(0.00) } },
+ { Cell{ cell_idx_c(4), cell_idx_c(1), cell_idx_c(0) },
+ Vector3< real_t >{ real_c(0.05), real_c(-0.10), real_c(0.00) } },
+ { Cell{ cell_idx_c(0), cell_idx_c(2), cell_idx_c(0) },
+ Vector3< real_t >{ real_c(0.05), real_c(0.00), real_c(0.00) } },
+ { Cell{ cell_idx_c(1), cell_idx_c(2), cell_idx_c(0) },
+ Vector3< real_t >{ real_c(0.05), real_c(0.00), real_c(0.00) } },
+ { Cell{ cell_idx_c(2), cell_idx_c(2), cell_idx_c(0) },
+ Vector3< real_t >{ real_c(0.00), real_c(0.00), real_c(0.00) } },
+ { Cell{ cell_idx_c(3), cell_idx_c(2), cell_idx_c(0) },
+ Vector3< real_t >{ real_c(0.05), real_c(0.00), real_c(0.00) } },
+ { Cell{ cell_idx_c(4), cell_idx_c(2), cell_idx_c(0) },
+ Vector3< real_t >{ real_c(0.05), real_c(0.00), real_c(0.00) } }
+ };
+
+ for (auto velocity = velocities.begin(); velocity != velocities.end(); velocity++)
+ {
+ pdfField->setDensityAndVelocity(velocity->first, velocity->second, initDensity);
+ pdfOrgField->setDensityAndVelocity(velocity->first, velocity->second, initDensity);
+ }
+
+ // modify the PDFs to achieve inequality for the equalAndNonEqualRefilling
+ for (auto d = Stencil_T::begin(); d != Stencil_T::end(); ++d)
+ {
+ using D = stencil::Direction;
+ D dir = d.direction();
+ Cell cell1(cell_idx_c(2), cell_idx_c(2), cell_idx_c(0));
+ Cell cell2(cell_idx_c(3), cell_idx_c(0), cell_idx_c(0));
+ Cell cell3(cell_idx_c(4), cell_idx_c(1), cell_idx_c(0));
+ Cell cell4(cell_idx_c(3), cell_idx_c(1), cell_idx_c(0));
+ Cell cell5(cell_idx_c(4), cell_idx_c(2), cell_idx_c(0));
+ real_t PDFOffset(real_c(0.03));
+
+ if (dir == D::SW)
+ {
+ pdfField->get(cell1, dir) += PDFOffset;
+ pdfOrgField->get(cell1, dir) += PDFOffset;
+ pdfField->get(cell3, dir) += PDFOffset;
+ pdfOrgField->get(cell3, dir) += PDFOffset;
+ pdfField->get(cell4, dir) += PDFOffset;
+ pdfOrgField->get(cell4, dir) += PDFOffset;
+ }
+ if (dir == D::E)
+ {
+ pdfField->get(cell1, dir) -= PDFOffset;
+ pdfOrgField->get(cell1, dir) -= PDFOffset;
+ pdfField->get(cell3, dir) -= PDFOffset;
+ pdfOrgField->get(cell3, dir) -= PDFOffset;
+ pdfField->get(cell5, dir) -= PDFOffset;
+ pdfOrgField->get(cell5, dir) -= PDFOffset;
+ }
+ if (dir == D::S)
+ {
+ pdfField->get(cell2, dir) -= PDFOffset;
+ pdfOrgField->get(cell2, dir) -= PDFOffset;
+ pdfField->get(cell3, dir) -= PDFOffset;
+ pdfOrgField->get(cell3, dir) -= PDFOffset;
+ pdfField->get(cell4, dir) -= PDFOffset;
+ pdfOrgField->get(cell4, dir) -= PDFOffset;
+ }
+ if (dir == D::NE)
+ {
+ pdfField->get(cell2, dir) += PDFOffset;
+ pdfOrgField->get(cell2, dir) += PDFOffset;
+ pdfField->get(cell3, dir) += PDFOffset;
+ pdfOrgField->get(cell3, dir) += PDFOffset;
+ pdfField->get(cell5, dir) += PDFOffset;
+ pdfOrgField->get(cell5, dir) += PDFOffset;
+ }
+ }
+
+ pdfOrgField = pdfField->clone();
+
+ // initialize fill level
+ WALBERLA_FOR_ALL_CELLS(fillFieldIt, fillField, {
+ if (gasCells.find(fillFieldIt.cell()) != gasCells.end()) { *fillFieldIt = real_c(0.0); }
+ else
+ {
+ if (interfaceCells.find(fillFieldIt.cell()) != interfaceCells.end()) { *fillFieldIt = real_c(0.5); }
+ else
+ {
+ if (liquidCells.find(fillFieldIt.cell()) != liquidCells.end()) { *fillFieldIt = real_c(1.0); }
+ }
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const FlagInfo< FlagField_T > flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+
+ // create timeloop
+ uint_t timesteps = uint_c(1);
+ SweepTimeloop timeloop(blockForest, timesteps);
+
+ Communication_T(blockForest, pdfFieldID, pdfOrgFieldID, flagFieldID)();
+
+ using geometryHandler = SurfaceGeometryHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >;
+ auto geometryHandlerPtr = std::make_shared< geometryHandler >(blockForest, freeSurfaceBoundaryHandling, fillFieldID,
+ "FiniteDifferenceMethod", false, false, real_c(0.0));
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ ScalarField_T* const fillField = blockIt->getData< ScalarField_T >(fillFieldID);
+ FlagField_T* const flagField = blockIt->getData< FlagField_T >(flagFieldID);
+
+ // convert a cell from gas to interface
+ WALBERLA_FOR_ALL_CELLS(fillFieldIt, fillField, flagFieldIt, flagField, {
+ if (conversionCells.find(flagFieldIt.cell()) != conversionCells.end())
+ {
+ // fill one cell entirely and create an interface cell from it; the fill level must be 1.1 to obtain the
+ // normal as used in the manual computations of the expected solutions
+ (*fillFieldIt) = real_c(1.1);
+
+ // mark cell to be reinitialized
+ field::removeFlag(flagFieldIt, flagInfo.gasFlag);
+ field::addFlag(flagFieldIt, flagInfo.interfaceFlag);
+ field::addFlag(flagFieldIt, flagInfo.convertedFlag);
+ field::addFlag(flagFieldIt, flagInfo.convertFromGasToInterfaceFlag);
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+
+ // perform refilling
+ switch (pdfRefillingModel.getModelType())
+ { // the scope for each "case" is required since variables are defined within "case"
+ case PdfRefillingModel::RefillingModel::EquilibriumRefilling: {
+ EquilibriumRefillingSweep< LatticeModel_T, FlagField_T > equilibriumRefillingSweep(pdfFieldID, flagFieldID,
+ flagInfo, true);
+ equilibriumRefillingSweep(blockIt.get());
+ break;
+ }
+
+ case PdfRefillingModel::RefillingModel::AverageRefilling: {
+ AverageRefillingSweep< LatticeModel_T, FlagField_T > averageRefillingSweep(pdfFieldID, flagFieldID, flagInfo,
+ true);
+ averageRefillingSweep(blockIt.get());
+ break;
+ }
+
+ case PdfRefillingModel::RefillingModel::EquilibriumAndNonEquilibriumRefilling: {
+ EquilibriumAndNonEquilibriumRefillingSweep< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >
+ equilibriumAndNonEquilibriumRefillingSweep(pdfFieldID, flagFieldID, fillFieldID, flagInfo, uint_c(3), true);
+ equilibriumAndNonEquilibriumRefillingSweep(blockIt.get());
+ break;
+ }
+
+ case PdfRefillingModel::RefillingModel::ExtrapolationRefilling: {
+ ExtrapolationRefillingSweep< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T >
+ extrapolationRefillingSweep(pdfFieldID, flagFieldID, fillFieldID, flagInfo, uint_c(3), true);
+ extrapolationRefillingSweep(blockIt.get());
+ break;
+ }
+
+ case PdfRefillingModel::RefillingModel::GradsMomentsRefilling: {
+ GradsMomentsRefillingSweep< LatticeModel_T, FlagField_T > gradsMomentsRefillingSweep(pdfFieldID, flagFieldID,
+ flagInfo, omega, true);
+ gradsMomentsRefillingSweep(blockIt.get());
+ break;
+ }
+ default:
+ WALBERLA_ABORT("The specified pdf refilling model is not available.");
+ }
+ }
+
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ const PdfField_T* const pdfField = blockIt->getData< const PdfField_T >(pdfFieldID);
+ const PdfField_T* const pdfOrgField = blockIt->getData< const PdfField_T >(pdfOrgFieldID);
+ const FlagField_T* const flagField = blockIt->getData< const FlagField_T >(flagFieldID);
+ const ScalarField_T* const fillField = blockIt->getData< const ScalarField_T >(fillFieldID);
+
+ WALBERLA_FOR_ALL_CELLS(pdfFieldIt, pdfField, pdfFieldOrgIt, pdfOrgField, flagFieldIt, flagField, fillFieldIt,
+ fillField, {
+ if (conversionCells.find(flagFieldIt.cell()) == conversionCells.end())
+ {
+ // check cells that were not converted if their PDFs changed
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfFieldIt[0], pdfFieldOrgIt[0]); // C, (0,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfFieldIt[1], pdfFieldOrgIt[1]); // N, (0,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfFieldIt[2], pdfFieldOrgIt[2]); // S, (0,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfFieldIt[3], pdfFieldOrgIt[3]); // W, (-1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfFieldIt[4], pdfFieldOrgIt[4]); // E, (1,0,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfFieldIt[5], pdfFieldOrgIt[5]); // NW, (-1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfFieldIt[6], pdfFieldOrgIt[6]); // NE, (1,1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfFieldIt[7], pdfFieldOrgIt[7]); // SW, (-1,-1,0)
+ WALBERLA_CHECK_FLOAT_EQUAL(pdfFieldIt[8], pdfFieldOrgIt[8]); // SE, (1,-1,0)
+ }
+ else
+ {
+ // check cells converted from gas to interface
+ verifyResults(pdfRefillingModel, pdfFieldIt.cell(), pdfField);
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ MPIManager::instance()->resetMPI();
+}
+
+} // namespace PdfRefillingTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::PdfRefillingTest::main(argc, argv); }
\ No newline at end of file
diff --git a/tests/lbm/free_surface/dynamics/PdfRefillingTest.ods b/tests/lbm/free_surface/dynamics/PdfRefillingTest.ods
new file mode 100644
index 0000000000000000000000000000000000000000..90899e2de1bc6574ddbf680509e901c84f202018
Binary files /dev/null and b/tests/lbm/free_surface/dynamics/PdfRefillingTest.ods differ
diff --git a/tests/lbm/free_surface/dynamics/WettingConversionTest.cpp b/tests/lbm/free_surface/dynamics/WettingConversionTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..8a2590c6983bd65f0e640a7288c0a09ba4f30ab2
--- /dev/null
+++ b/tests/lbm/free_surface/dynamics/WettingConversionTest.cpp
@@ -0,0 +1,247 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file WettingConversionTest.cpp
+//! \ingroup lbm/free_surface/dynamics
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Test cell conversion initiated by wetting.
+//!
+//! Initialize drop as a cylinder section near a solid wall. Run a free surface LBM simulation with local triangulation
+//! and wetting, and evaluate the converted interface cells for correctness.
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+
+#include "lbm/field/Adaptors.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface/bubble_model/Geometry.h"
+#include "lbm/free_surface/dynamics/SurfaceDynamicsHandler.h"
+#include "lbm/free_surface/surface_geometry/SurfaceGeometryHandler.h"
+#include "lbm/lattice_model/D3Q19.h"
+
+#include <algorithm>
+#include <vector>
+namespace walberla
+{
+namespace free_surface
+{
+namespace WettingConversionTest
+{
+// define types
+using flag_t = uint32_t;
+using FlagField_T = FlagField< flag_t >;
+
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+
+template< typename LatticeModel_T >
+std::vector< Cell > runSimulation(uint_t timesteps, real_t contactAngle)
+{
+ using Stencil_T = typename LatticeModel_T::Stencil;
+ using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+ using Communication_T = blockforest::SimpleCommunication< typename LatticeModel_T::CommunicationStencil >;
+
+ // define the domain size
+ const Vector3< uint_t > numBlocks(uint_c(1));
+ const Vector3< uint_t > domainSize(uint_c(14), uint_c(7), uint_c(1));
+ const Vector3< uint_t > cellsPerBlock(domainSize[0] / numBlocks[0], domainSize[1] / numBlocks[1],
+ domainSize[2] / numBlocks[2]);
+
+ // create block grid
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ blockforest::createUniformBlockGrid(numBlocks[0], numBlocks[1], numBlocks[2], // blocks
+ cellsPerBlock[0], cellsPerBlock[1], cellsPerBlock[2], // cells
+ real_c(1.0), // dx
+ true, // one block per process
+ false, false, true); // periodicity
+
+ real_t relaxRate = real_c(1.8);
+
+ // create lattice model
+ LatticeModel_T latticeModel = LatticeModel_T(lbm::collision_model::SRT(relaxRate));
+
+ // add pdf field
+ const BlockDataID pdfFieldID = lbm::addPdfFieldToStorage(blockForest, "PDF field", latticeModel, field::fzyx);
+
+ // add fill level field (initialized with 0, i.e., gas everywhere)
+ BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill level field", real_c(0.0), field::fzyx, uint_c(1));
+
+ // add dummy force field
+ BlockDataID forceFieldID = field::addToStorage< VectorField_T >(
+ blockForest, "Force field", Vector3< real_t >(real_c(0)), field::fzyx, uint_c(1));
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ // add liquid drop (as cylinder section)
+ Vector3< real_t > midpoint1(real_c(14) * real_c(0.5), real_c(1), real_c(0));
+ Vector3< real_t > midpoint2(real_c(14) * real_c(0.5), real_c(1), real_c(5));
+ geometry::Cylinder cylinder(midpoint1, midpoint2, real_c(14) * real_c(0.2));
+ bubble_model::addBodyToFillLevelField< geometry::Cylinder >(*blockForest, fillFieldID, cylinder, false);
+
+ // initialize bottom (in y-direction) of domain as no-slip boundary
+ freeSurfaceBoundaryHandling->setNoSlipAtBorder(stencil::S, cell_idx_c(0));
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+
+ // initial communication
+ Communication_T(blockForest, pdfFieldID, fillFieldID, flagFieldID, forceFieldID)();
+
+ // add (dummy) bubble model
+ const bool disableSplits = true; // necessary if a gas bubble could split
+ auto bubbleModel = std::make_shared< bubble_model::BubbleModel< Stencil_T > >(blockForest, disableSplits);
+ bubbleModel->initFromFillLevelField(fillFieldID);
+ bubbleModel->setAtmosphere(Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(0)), real_c(1));
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, timesteps);
+
+ // add surface geometry handler
+ SurfaceGeometryHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > geometryHandler(
+ blockForest, freeSurfaceBoundaryHandling, fillFieldID, "LocalTriangulation", true, true, contactAngle);
+ geometryHandler.addSweeps(timeloop);
+
+ const ConstBlockDataID curvatureFieldID = geometryHandler.getConstCurvatureFieldID();
+ const ConstBlockDataID normalFieldID = geometryHandler.getConstNormalFieldID();
+
+ // add surface dynamics handler
+ SurfaceDynamicsHandler< LatticeModel_T, FlagField_T, ScalarField_T, VectorField_T > dynamicsHandler(
+ blockForest, pdfFieldID, flagFieldID, fillFieldID, forceFieldID, normalFieldID, curvatureFieldID,
+ freeSurfaceBoundaryHandling, bubbleModel, "NormalBasedKeepCenter", "EquilibriumRefilling", "EvenlyNewInterface",
+ relaxRate, Vector3< real_t >(real_c(0)), real_c(1e-2), false, false, real_c(1e-3), real_c(1e-1));
+ dynamicsHandler.addSweeps(timeloop);
+
+ timeloop.run();
+
+ // get interface cells after performing simulation
+ std::vector< Cell > interfaceCells;
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ const FlagField_T* const flagField = blockIt->getData< const FlagField_T >(flagFieldID);
+
+ WALBERLA_FOR_ALL_CELLS_OMP(flagFieldIt, flagField, omp critical, {
+ if (flagInfo.isInterface(flagFieldIt)) { interfaceCells.emplace_back(flagFieldIt.cell()); }
+ }) // WALBERLA_FOR_ALL_CELLS_OMP
+ }
+
+ return interfaceCells;
+}
+
+template< typename LatticeModel_T >
+void testWettingConversion()
+{
+ uint_t timesteps;
+ real_t contactAngle;
+ std::vector< Cell > expectedInterfaceCells;
+ std::vector< Cell > computedInterfaceCells;
+ bool vectorsEqual;
+
+ // test different contact angles; expected results have been determined using a version of the code that was assumed
+ // to be correct
+ timesteps = uint_c(200);
+ contactAngle = real_c(120);
+ expectedInterfaceCells = std::vector< Cell >{
+ Cell(cell_idx_c(4), cell_idx_c(1), cell_idx_c(0)), Cell(cell_idx_c(9), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(4), cell_idx_c(2), cell_idx_c(0)), Cell(cell_idx_c(9), cell_idx_c(2), cell_idx_c(0)),
+ Cell(cell_idx_c(4), cell_idx_c(3), cell_idx_c(0)), Cell(cell_idx_c(5), cell_idx_c(3), cell_idx_c(0)),
+ Cell(cell_idx_c(6), cell_idx_c(3), cell_idx_c(0)), Cell(cell_idx_c(7), cell_idx_c(3), cell_idx_c(0)),
+ Cell(cell_idx_c(8), cell_idx_c(3), cell_idx_c(0)), Cell(cell_idx_c(9), cell_idx_c(3), cell_idx_c(0))
+ };
+ WALBERLA_LOG_INFO("Testing interface conversion with wetting cells, contact angle=" << contactAngle << " degrees");
+ computedInterfaceCells = runSimulation< LatticeModel_T >(timesteps, contactAngle);
+ vectorsEqual = std::is_permutation(computedInterfaceCells.begin(), computedInterfaceCells.end(),
+ expectedInterfaceCells.begin(), expectedInterfaceCells.end());
+ if (!vectorsEqual) { WALBERLA_ABORT("Wrong cells converted."); }
+ MPIManager::instance()->resetMPI();
+
+ timesteps = uint_c(200);
+ contactAngle = real_c(80);
+ expectedInterfaceCells = std::vector< Cell >{
+ Cell(cell_idx_c(3), cell_idx_c(1), cell_idx_c(0)), Cell(cell_idx_c(4), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(9), cell_idx_c(1), cell_idx_c(0)), Cell(cell_idx_c(10), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(4), cell_idx_c(2), cell_idx_c(0)), Cell(cell_idx_c(5), cell_idx_c(2), cell_idx_c(0)),
+ Cell(cell_idx_c(8), cell_idx_c(2), cell_idx_c(0)), Cell(cell_idx_c(9), cell_idx_c(2), cell_idx_c(0)),
+ Cell(cell_idx_c(5), cell_idx_c(3), cell_idx_c(0)), Cell(cell_idx_c(6), cell_idx_c(3), cell_idx_c(0)),
+ Cell(cell_idx_c(7), cell_idx_c(3), cell_idx_c(0)), Cell(cell_idx_c(8), cell_idx_c(3), cell_idx_c(0))
+ };
+ WALBERLA_LOG_INFO("Testing interface conversion with wetting cells, contact angle=" << contactAngle << " degrees");
+ computedInterfaceCells = runSimulation< LatticeModel_T >(timesteps, contactAngle);
+ vectorsEqual = std::is_permutation(computedInterfaceCells.begin(), computedInterfaceCells.end(),
+ expectedInterfaceCells.begin(), expectedInterfaceCells.end());
+ if (!vectorsEqual) { WALBERLA_ABORT("Wrong cells converted."); }
+ MPIManager::instance()->resetMPI();
+
+ timesteps = uint_c(200);
+ contactAngle = real_c(45);
+ expectedInterfaceCells = std::vector< Cell >{
+ Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(0)), Cell(cell_idx_c(3), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(10), cell_idx_c(1), cell_idx_c(0)), Cell(cell_idx_c(11), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(3), cell_idx_c(2), cell_idx_c(0)), Cell(cell_idx_c(4), cell_idx_c(2), cell_idx_c(0)),
+ Cell(cell_idx_c(5), cell_idx_c(2), cell_idx_c(0)), Cell(cell_idx_c(6), cell_idx_c(2), cell_idx_c(0)),
+ Cell(cell_idx_c(7), cell_idx_c(2), cell_idx_c(0)), Cell(cell_idx_c(8), cell_idx_c(2), cell_idx_c(0)),
+ Cell(cell_idx_c(9), cell_idx_c(2), cell_idx_c(0)), Cell(cell_idx_c(10), cell_idx_c(2), cell_idx_c(0))
+ };
+ WALBERLA_LOG_INFO("Testing interface conversion with wetting cells, contact angle=" << contactAngle << " degrees");
+ computedInterfaceCells = runSimulation< LatticeModel_T >(timesteps, contactAngle);
+ vectorsEqual = std::is_permutation(computedInterfaceCells.begin(), computedInterfaceCells.end(),
+ expectedInterfaceCells.begin(), expectedInterfaceCells.end());
+ if (!vectorsEqual) { WALBERLA_ABORT("Wrong cells converted."); }
+ MPIManager::instance()->resetMPI();
+
+ timesteps = uint_c(500);
+ contactAngle = real_c(1);
+ expectedInterfaceCells = std::vector< Cell >{
+ Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)), Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(3), cell_idx_c(1), cell_idx_c(0)), Cell(cell_idx_c(10), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(11), cell_idx_c(1), cell_idx_c(0)), Cell(cell_idx_c(12), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(3), cell_idx_c(2), cell_idx_c(0)), Cell(cell_idx_c(4), cell_idx_c(2), cell_idx_c(0)),
+ Cell(cell_idx_c(5), cell_idx_c(2), cell_idx_c(0)), Cell(cell_idx_c(6), cell_idx_c(2), cell_idx_c(0)),
+ Cell(cell_idx_c(7), cell_idx_c(2), cell_idx_c(0)), Cell(cell_idx_c(8), cell_idx_c(2), cell_idx_c(0)),
+ Cell(cell_idx_c(9), cell_idx_c(2), cell_idx_c(0)), Cell(cell_idx_c(10), cell_idx_c(2), cell_idx_c(0))
+ };
+ WALBERLA_LOG_INFO("Testing interface conversion with wetting cells, contact angle=" << contactAngle << " degrees");
+ computedInterfaceCells = runSimulation< LatticeModel_T >(timesteps, contactAngle);
+ vectorsEqual = std::is_permutation(computedInterfaceCells.begin(), computedInterfaceCells.end(),
+ expectedInterfaceCells.begin(), expectedInterfaceCells.end());
+ if (!vectorsEqual) { WALBERLA_ABORT("Wrong cells converted."); }
+
+ MPIManager::instance()->resetMPI();
+}
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+
+ WALBERLA_LOG_INFO("Testing with D3Q19 stencil.");
+ testWettingConversion< lbm::D3Q19< lbm::collision_model::SRT, true, lbm::force_model::None, 2 > >();
+
+ WALBERLA_LOG_INFO("Testing with D3Q27 stencil.");
+ testWettingConversion< lbm::D3Q27< lbm::collision_model::SRT, true, lbm::force_model::None, 2 > >();
+
+ return EXIT_SUCCESS;
+}
+
+} // namespace WettingConversionTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::WettingConversionTest::main(argc, argv); }
\ No newline at end of file
diff --git a/tests/lbm/free_surface/surface_geometry/CellFluidVolumeTest.cpp b/tests/lbm/free_surface/surface_geometry/CellFluidVolumeTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..24fcc259bd67fd9ac1a1b736f67ab261e06d46fd
--- /dev/null
+++ b/tests/lbm/free_surface/surface_geometry/CellFluidVolumeTest.cpp
@@ -0,0 +1,74 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file CellFluidVolumeTest.cpp
+//! \ingroup lbm/free_surface/surface_geometry
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Calculate fluid volume within a cell and compare with results obtained with ParaView.
+//
+//======================================================================================================================
+
+#include "core/Environment.h"
+#include "core/debug/Debug.h"
+#include "core/debug/TestSubsystem.h"
+
+#include "lbm/free_surface/surface_geometry/CurvatureSweep.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace CellFluidVolumeTest
+{
+inline void test(const Vector3< real_t >& normal, real_t offset, real_t expectedVolume, real_t tolerance)
+{
+ real_t volume = computeCellFluidVolume(normal, offset);
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(expectedVolume, volume, tolerance);
+}
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+
+ // allowed deviation from the expected result
+ real_t tolerance = real_c(1e-3);
+
+ // test case where simple formula is applied (Figure 2.12, p. 24 in dissertation of Thomas Pohl)
+ const Vector3< real_t > normalSimpleCase(real_c(0), real_c(0.5), real_c(0.866));
+ const real_t offsetSimpleCase = real_c(-0.1);
+ const real_t expectedVolumeSimpleCase = real_c(0.3845); // obtained with ParaView
+ test(normalSimpleCase, offsetSimpleCase, expectedVolumeSimpleCase, tolerance);
+
+ // test cases as in dissertation of Thomas Pohl, page 25
+ const Vector3< real_t > normal(real_c(0.37), real_c(0.61), real_c(0.7));
+ const std::vector< real_t > offsetList{ real_c(-0.52), real_c(-0.3), real_c(-0.17), real_c(0) };
+ const std::vector< real_t > volumeList{ real_c(0.0347), real_c(0.1612), real_c(0.2887),
+ real_c(0.5) }; // obtained with ParaView
+
+ WALBERLA_ASSERT_EQUAL(offsetList.size(), volumeList.size());
+
+ for (size_t i = 0; i != offsetList.size(); ++i)
+ {
+ test(normal, offsetList[i], volumeList[i], tolerance);
+ }
+
+ return EXIT_SUCCESS;
+}
+} // namespace CellFluidVolumeTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::CellFluidVolumeTest::main(argc, argv); }
diff --git a/tests/lbm/free_surface/surface_geometry/CurvatureOfSineTest.cpp b/tests/lbm/free_surface/surface_geometry/CurvatureOfSineTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..9220f802244306482e9c796bb2946171a56f7a1a
--- /dev/null
+++ b/tests/lbm/free_surface/surface_geometry/CurvatureOfSineTest.cpp
@@ -0,0 +1,545 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file CurvatureOfSineTest.cpp
+//! \ingroup lbm/free_surface/surface_geometry
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Initialize sine profile and compare computed curvature with analytical curvature.
+//
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+#include "core/logging/Logging.h"
+#include "core/math/Constants.h"
+#include "core/math/DistributedSample.h"
+
+#include "field/AddToStorage.h"
+
+#include "lbm/blockforest/communication/SimpleCommunication.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface/boundary/FreeSurfaceBoundaryHandling.h"
+#include "lbm/free_surface/surface_geometry/CurvatureSweep.h"
+#include "lbm/free_surface/surface_geometry/ExtrapolateNormalsSweep.h"
+#include "lbm/free_surface/surface_geometry/NormalSweep.h"
+#include "lbm/free_surface/surface_geometry/SmoothingSweep.h"
+#include "lbm/lattice_model/CollisionModel.h"
+#include "lbm/lattice_model/D2Q9.h"
+#include "lbm/lattice_model/D3Q19.h"
+#include "lbm/lattice_model/D3Q27.h"
+
+#include "stencil/D2Q9.h"
+#include "stencil/D3Q19.h"
+#include "stencil/D3Q27.h"
+
+#include "timeloop/SweepTimeloop.h"
+
+#include <cmath>
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace CurvatureOfSineTest
+{
+// define types
+using flag_t = uint32_t;
+
+// define fields
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+using FlagField_T = FlagField< flag_t >;
+
+// function describing the global sine profile
+inline real_t function(real_t x, real_t amplitude, real_t offset, uint_t domainWidth)
+{
+ return amplitude * std::sin(x / real_c(domainWidth) * real_c(2) * math::pi) + offset;
+}
+
+// derivative of the function that is describing the sine profile
+inline real_t derivative(real_t x, real_t amplitude, uint_t domainWidth)
+{
+ const real_t domainWidthInv = real_c(1) / real_c(domainWidth);
+ return amplitude * std::cos(x * domainWidthInv * real_c(2) * math::pi) * real_c(2) * math::pi * domainWidthInv;
+}
+
+// second derivative of the function that is describing the sine profile
+inline real_t secondDerivative(real_t x, real_t amplitude, uint_t domainWidth)
+{
+ const real_t domainWidthInv = real_c(1) / real_c(domainWidth);
+
+ // the minus has been neglected on purpose: due to the definition of the normal (pointing from liquid to gas), the
+ // curvature also has a different sign
+ return amplitude * std::sin(x * domainWidthInv * real_c(2) * math::pi) * real_c(4) * math::pi * math::pi *
+ domainWidthInv * domainWidthInv;
+}
+
+// compute the analytical normal vector and evaluate the error of the computed normal (absolute error in angle)
+template< typename Stencil_T >
+class ComputeAnalyticalNormal
+{
+ public:
+ ComputeAnalyticalNormal(const std::weak_ptr< const StructuredBlockForest >& blockForest, BlockDataID& normalFieldID,
+ const ConstBlockDataID& flagFieldID, const field::FlagUID& interfaceFlagID,
+ const Vector3< uint_t >& domainSize, real_t amplitude)
+ : blockForest_(blockForest), normalFieldID_(normalFieldID), flagFieldID_(flagFieldID),
+ interfaceFlagID_(interfaceFlagID), domainSize_(domainSize), amplitude_(amplitude)
+ {}
+
+ void operator()(IBlock* const block)
+ {
+ const auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ // compute analytical normals
+ const FlagField_T* const flagField = block->getData< const FlagField_T >(flagFieldID_);
+ VectorField_T* const normalField = block->getData< VectorField_T >(normalFieldID_);
+
+ const flag_t interfaceFlag = flagField->getFlag(interfaceFlagID_);
+
+ // explicitly use either D2Q9 or D3Q27 here, as the geometry operations require (or are most accurate with) the
+ // full neighborhood;
+ using NeighborhoodStencil_T =
+ typename std::conditional< Stencil_T::D == uint_t(2), stencil::D2Q9, stencil::D3Q27 >::type;
+
+ WALBERLA_FOR_ALL_CELLS(flagFieldIt, flagField, normalFieldIt, normalField, {
+ // only treat interface cells
+ if (!isFlagSet(flagFieldIt, interfaceFlag) &&
+ !field::isFlagInNeighborhood< NeighborhoodStencil_T >(flagFieldIt, interfaceFlag))
+ {
+ continue;
+ }
+
+ Cell globalCell = flagFieldIt.cell();
+ blockForest->transformBlockLocalToGlobalCell(globalCell, *block, flagFieldIt.cell());
+
+ // global x-location of this cell's center
+ const real_t globalXCenter = real_c(globalCell[0]) + real_c(0.5);
+
+ // get normal vector (slope of the negative inverse derivative gives direction of the normal)
+ Vector3< real_t > normalVec =
+ Vector3< real_t >(real_c(1), -real_c(1) / derivative(globalXCenter, amplitude_, domainSize_[0]), real_c(0));
+ normalVec = normalVec.getNormalized();
+
+ // mirror vectors that are pointing downwards, as normal vector is defined to point from fluid to gas in FSLBM
+ if (normalVec[1] < real_c(0)) { normalVec *= -real_c(1); }
+
+ *normalFieldIt = normalVec;
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ private:
+ std::weak_ptr< const StructuredBlockForest > blockForest_;
+ BlockDataID normalFieldID_;
+ ConstBlockDataID flagFieldID_;
+
+ field::FlagUID interfaceFlagID_;
+
+ Vector3< uint_t > domainSize_;
+ real_t amplitude_;
+}; // class ComputeAnalyticalNormal
+
+// compute the analytical normal vector and evaluate the error of the computed normal (absolute error in angle)
+template< typename Stencil_T >
+class ComputeCurvatureError
+{
+ public:
+ ComputeCurvatureError(const std::weak_ptr< const StructuredBlockForest >& blockForest,
+ const ConstBlockDataID& curvatureFieldID, const ConstBlockDataID& flagFieldID,
+ const field::FlagUID& interfaceFlagID, const Vector3< uint_t >& domainSize, real_t amplitude,
+ const std::shared_ptr< real_t >& l2Error)
+ : blockForest_(blockForest), curvatureFieldID_(curvatureFieldID), flagFieldID_(flagFieldID),
+ interfaceFlagID_(interfaceFlagID), domainSize_(domainSize), amplitude_(amplitude), l2Error_(l2Error)
+ {}
+
+ void operator()(IBlock* const block)
+ {
+ const auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ // compute analytical normals and compare their directions with the computed normals
+ const FlagField_T* const flagField = block->getData< const FlagField_T >(flagFieldID_);
+ const ScalarField_T* const curvatureField = block->getData< const ScalarField_T >(curvatureFieldID_);
+
+ const flag_t interfaceFlag = flagField->getFlag(interfaceFlagID_);
+
+ real_t curvDiffSum2 = real_c(0);
+ real_t analCurvSum2 = real_c(0);
+
+ WALBERLA_FOR_ALL_CELLS_OMP(flagFieldIt, flagField, curvatureFieldIt, curvatureField,
+ omp parallel for schedule(static) reduction(+:curvDiffSum2) reduction(+:analCurvSum2),
+ {
+ // only treat interface cells
+ if (isFlagSet(flagFieldIt, interfaceFlag))
+ {
+ Cell globalCell = flagFieldIt.cell();
+ blockForest->transformBlockLocalToGlobalCell(globalCell, *block, flagFieldIt.cell());
+
+ // normalized global x-location of this cell's center
+ const real_t globalXCenter = real_c(globalCell[0]) + real_c(0.5);
+
+ // get analytical curvature
+ const real_t analyticalCurvature = secondDerivative(globalXCenter, amplitude_, domainSize_[0]);
+
+ // calculate the relative error in curvature (dx=1/domainSize[0] for converting from LBM to physical units)
+ const real_t curvDiff = *curvatureFieldIt - analyticalCurvature;
+ curvDiffSum2 += curvDiff * curvDiff;
+ analCurvSum2 += analyticalCurvature * analyticalCurvature;
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_OMP
+
+ mpi::allReduceInplace< real_t >(curvDiffSum2, mpi::SUM);
+ mpi::allReduceInplace< real_t >(analCurvSum2, mpi::SUM);
+
+ *l2Error_ = std::pow(curvDiffSum2 / analCurvSum2, real_c(0.5));
+
+ WALBERLA_LOG_RESULT("Relative error in curvature according to L2 norm = " << *l2Error_);
+ }
+
+ private:
+ std::weak_ptr< const StructuredBlockForest > blockForest_;
+ ConstBlockDataID curvatureFieldID_;
+ ConstBlockDataID flagFieldID_;
+
+ field::FlagUID interfaceFlagID_;
+
+ Vector3< uint_t > domainSize_;
+ real_t amplitude_;
+
+ std::shared_ptr< real_t > l2Error_;
+}; // class ComputeCurvatureError
+
+template< typename LatticeModel_T >
+real_t test(uint_t domainWidth, real_t amplitude, real_t offset, uint_t fillLevelInitSamples, bool useTriangulation,
+ bool useAnalyticalNormal)
+{
+ // define types
+ using Stencil_T = typename LatticeModel_T::Stencil;
+ using Communication_T = blockforest::SimpleCommunication< typename LatticeModel_T::CommunicationStencil >;
+ using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+ // define the domain size
+ const Vector3< uint_t > numBlocks(uint_c(1));
+ Vector3< uint_t > domainSize(domainWidth);
+ domainSize[2] = uint_c(1);
+ const Vector3< uint_t > cellsPerBlock(domainSize[0] / numBlocks[0], domainSize[1] / numBlocks[1],
+ domainSize[2] / numBlocks[2]);
+
+ // create block grid
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ blockforest::createUniformBlockGrid(numBlocks[0], numBlocks[1], numBlocks[2], // blocks
+ cellsPerBlock[0], cellsPerBlock[1], cellsPerBlock[2], // cells
+ real_c(1.0), // dx
+ true, // one block per process
+ true, false, true); // periodicity
+
+ // create lattice model with omega=1
+ LatticeModel_T latticeModel(real_c(1.0));
+
+ // add fields
+ BlockDataID pdfFieldID =
+ lbm::addPdfFieldToStorage< LatticeModel_T >(blockForest, "PDF field", latticeModel, field::fzyx);
+ BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill levels", real_c(1), field::fzyx, uint_c(1));
+ BlockDataID normalFieldID = field::addToStorage< VectorField_T >(
+ blockForest, "Normals", Vector3< real_t >(real_c(0)), field::fzyx, uint_c(1));
+ BlockDataID curvatureFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Curvature", real_c(0), field::fzyx, uint_c(1));
+ BlockDataID smoothFillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Smooth fill levels", real_c(1.0), field::fzyx, uint_c(1));
+
+ // obstacle normal field is only a dummy field here (wetting effects are not considered in this test)
+ BlockDataID dummyObstNormalFieldID = field::addToStorage< VectorField_T >(
+ blockForest, "Dummy obstacle normal field", Vector3< real_t >(real_c(0)), field::fzyx, uint_c(1));
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+
+ // initialize sine profile such that there is exactly one period; every length is normalized with domainSize[0]
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ const uint_t numTotalPoints = fillLevelInitSamples * fillLevelInitSamples;
+ const real_t stepsize = real_c(1) / real_c(fillLevelInitSamples);
+
+ ScalarField_T* const fillField = blockIt->getData< ScalarField_T >(fillFieldID);
+
+ WALBERLA_FOR_ALL_CELLS(fillFieldIt, fillField, {
+ // cell in block-local coordinates
+ const Cell localCell = fillFieldIt.cell();
+
+ // get cell in global coordinates
+ Cell globalCell = fillFieldIt.cell();
+ blockForest->transformBlockLocalToGlobalCell(globalCell, *blockIt, localCell);
+
+ // Monte-Carlo like estimation of the fill level:
+ // create uniformly-distributed sample points in each cell and count the number of points below the sine
+ // profile; this fraction of points is used as the fill level to initialize the profile
+ uint_t numPointsBelow = uint_c(0);
+
+ for (uint_t xSample = uint_c(0); xSample < fillLevelInitSamples; ++xSample)
+ {
+ // value of the sine-function
+ const real_t functionValue =
+ function(real_c(globalCell[0]) + real_c(xSample) * stepsize, amplitude, offset, domainSize[0]);
+
+ for (uint_t ySample = uint_c(0); ySample < fillLevelInitSamples; ++ySample)
+ {
+ const real_t yPoint = real_c(globalCell[1]) + real_c(ySample) * stepsize;
+ if (yPoint < functionValue) { ++numPointsBelow; }
+ }
+ }
+
+ // fill level is fraction of points below sine profile
+ fillField->get(localCell) = real_c(numPointsBelow) / real_c(numTotalPoints);
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ // communicate fill level field to have meaningful values in ghost layer cells in periodic directions
+ Communication_T(blockForest, fillFieldID)();
+
+ // initialize fill level field
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+
+ // communicate initialized flag field
+ Communication_T(blockForest, flagFieldID)();
+
+ // contact angle is only a dummy object here (wetting effects are not considered in this test)
+ ContactAngle dummyContactAngle(real_c(0));
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, uint_c(50));
+
+ BlockDataID* relevantFillFieldID = &fillFieldID;
+
+ if (useAnalyticalNormal)
+ {
+ // add sweep for getting analytical interface normal
+ ComputeAnalyticalNormal< Stencil_T > analyticalNormalSweep(blockForest, normalFieldID, flagFieldID,
+ flagIDs::interfaceFlagID, domainSize, amplitude);
+ timeloop.add() << Sweep(analyticalNormalSweep, "Analytical normal sweep")
+ << AfterFunction(Communication_T(blockForest, normalFieldID),
+ "Communication after analytical normal sweep");
+ }
+ else
+ {
+ if (!useTriangulation)
+ {
+ smoothFillFieldID = field::addToStorage< ScalarField_T >(blockForest, "Smooth fill levels", real_c(1.0),
+ field::fzyx, uint_c(1));
+
+ // add sweep for smoothing the fill level field when not using local triangulation
+ SmoothingSweep< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > smoothingSweep(
+ smoothFillFieldID, fillFieldID, flagFieldID, flagIDs::liquidInterfaceGasFlagIDs,
+ freeSurfaceBoundaryHandling->getFlagInfo().getObstacleIDSet(), false);
+ timeloop.add() << Sweep(smoothingSweep, "Smoothing sweep")
+ << AfterFunction(Communication_T(blockForest, smoothFillFieldID),
+ "Communication after smoothing sweep");
+
+ relevantFillFieldID = &smoothFillFieldID;
+ }
+
+ NormalSweep< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > normalsSweep(
+ normalFieldID, *relevantFillFieldID, flagFieldID, flagIDs::interfaceFlagID, flagIDs::liquidInterfaceGasFlagIDs,
+ freeSurfaceBoundaryHandling->getFlagInfo().getObstacleIDSet(), !useTriangulation, false, false, false);
+ timeloop.add() << Sweep(normalsSweep, "Normal sweep")
+ << AfterFunction(Communication_T(blockForest, normalFieldID), "Communication after normal sweep");
+ }
+
+ if (useTriangulation) // use local triangulation for curvature computation
+ {
+ CurvatureSweepLocalTriangulation< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > curvatureSweep(
+ blockForest, curvatureFieldID, normalFieldID, fillFieldID, flagFieldID, dummyObstNormalFieldID,
+ flagIDs::interfaceFlagID, freeSurfaceBoundaryHandling->getFlagInfo().getObstacleIDSet(), false,
+ dummyContactAngle);
+ timeloop.add() << Sweep(curvatureSweep, "Curvature sweep");
+ }
+ else // use finite differences for curvature computation
+ {
+ CurvatureSweepFiniteDifferences< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > curvatureSweep(
+ curvatureFieldID, normalFieldID, dummyObstNormalFieldID, flagFieldID, flagIDs::interfaceFlagID,
+ flagIDs::liquidInterfaceGasFlagIDs, freeSurfaceBoundaryHandling->getFlagInfo().getObstacleIDSet(), false,
+ dummyContactAngle);
+ timeloop.add() << Sweep(curvatureSweep, "Curvature sweep");
+ }
+
+ // add sweep for computing the error (with respect to analytical solution) of the interface curvature
+ std::shared_ptr< real_t > l2Error = std::make_shared< real_t >(real_c(0));
+ ComputeCurvatureError< Stencil_T > errorEvaluationSweep(blockForest, curvatureFieldID, flagFieldID,
+ flagIDs::interfaceFlagID, domainSize, amplitude, l2Error);
+ timeloop.add() << Sweep(errorEvaluationSweep, "Error evaluation sweep");
+
+ // perform a single time step
+ timeloop.singleStep();
+
+ MPIManager::instance()->resetMPI();
+
+ return *l2Error;
+}
+
+template< typename LatticeModel_T >
+void runAllTests()
+{
+ using Stencil_T = typename LatticeModel_T::Stencil;
+
+ real_t l2Error;
+
+ // used for initializing the fill level in a Monte-Carlo-like fashion; each cell is sampled by the specified value in
+ // x- and y-direction
+ const uint_t fillLevelInitSamples = uint_c(100);
+
+ // test with various domain sizes, i.e., resolutions
+ for (uint_t domainWidth = uint_c(50); domainWidth <= uint_c(200); domainWidth += uint_c(50))
+ {
+ const real_t amplitude = real_c(0.1) * real_c(domainWidth); // amplitude of the sine profile
+ const real_t offset = real_c(0.5) * real_c(domainWidth); // offset the sine profile in y-direction
+
+ WALBERLA_LOG_RESULT("Domain width " << domainWidth << " cells; curvature with finite difference method;");
+ l2Error = test< LatticeModel_T >(domainWidth, amplitude, offset, fillLevelInitSamples, false, false);
+ if constexpr (std::is_same_v< Stencil_T, stencil::D2Q9 > || std::is_same_v< Stencil_T, stencil::D3Q27 >)
+ {
+ WALBERLA_CHECK_LESS(l2Error, real_c(0.63));
+ }
+ // computation is less accurate if corner directions are not included (as opposed to D2Q9/D3Q27)
+ if constexpr (std::is_same_v< Stencil_T, stencil::D3Q19 >) { WALBERLA_CHECK_LESS(l2Error, real_c(0.756)); }
+
+ WALBERLA_LOG_RESULT("Domain width "
+ << domainWidth
+ << " cells; curvature with finite difference method; normal from analytical solution;");
+ l2Error = test< LatticeModel_T >(domainWidth, amplitude, offset, fillLevelInitSamples, false, true);
+ if constexpr (std::is_same_v< Stencil_T, stencil::D2Q9 > || std::is_same_v< Stencil_T, stencil::D3Q27 >)
+ {
+ WALBERLA_CHECK_LESS(l2Error, real_c(0.52));
+ }
+ // computation is less accurate if corner directions are not included (as opposed to D2Q9/D3Q27)
+ if constexpr (std::is_same_v< Stencil_T, stencil::D3Q19 >) { WALBERLA_CHECK_LESS(l2Error, real_c(0.58)); }
+
+ if constexpr (!std::is_same_v< Stencil_T, stencil::D2Q9 >)
+ {
+ WALBERLA_LOG_RESULT("Domain width " << domainWidth << " cells; curvature with local triangulation;");
+ l2Error = test< LatticeModel_T >(domainWidth, amplitude, offset, fillLevelInitSamples, true, false);
+ if constexpr (std::is_same_v< Stencil_T, stencil::D3Q27 >) { WALBERLA_CHECK_LESS(l2Error, real_c(0.79)); }
+ // computation is less accurate if corner directions are not included (as opposed to D2Q9/D3Q27)
+ if constexpr (std::is_same_v< Stencil_T, stencil::D3Q19 >) { WALBERLA_CHECK_LESS(l2Error, real_c(0.845)); }
+
+ WALBERLA_LOG_RESULT("Domain width "
+ << domainWidth
+ << " cells; curvature with local triangulation; normal from analytical solution;");
+ l2Error = test< LatticeModel_T >(domainWidth, amplitude, offset, fillLevelInitSamples, true, true);
+ WALBERLA_CHECK_LESS(l2Error, real_c(0.71));
+ }
+ }
+
+ // test with various amplitudes
+ for (real_t i = real_c(0.1); i <= real_c(0.3); i += real_c(0.05))
+ {
+ const uint_t domainWidth = uint_c(100); // size of the domain in x- and y-direction
+ const real_t amplitude = i * real_c(domainWidth); // amplitude of the sine profile
+ const real_t offset = real_c(0.5) * real_c(domainWidth); // offset the sine profile in y-direction
+
+ WALBERLA_LOG_RESULT("Amplitude " << amplitude << " cells; curvature with finite difference method;");
+ l2Error = test< LatticeModel_T >(domainWidth, amplitude, offset, fillLevelInitSamples, false, false);
+ if constexpr (std::is_same_v< Stencil_T, stencil::D2Q9 > || std::is_same_v< Stencil_T, stencil::D3Q27 >)
+ {
+ WALBERLA_CHECK_LESS(l2Error, real_c(0.76));
+ }
+ // computation is less accurate if corner directions are not included (as opposed to D2Q9/D3Q27)
+ if constexpr (std::is_same_v< Stencil_T, stencil::D3Q19 >) { WALBERLA_CHECK_LESS(l2Error, real_c(0.79)); }
+
+ WALBERLA_LOG_RESULT(
+ "Amplitude " << amplitude
+ << " cells; curvature with finite difference method; normal from analytical solution;");
+ l2Error = test< LatticeModel_T >(domainWidth, amplitude, offset, fillLevelInitSamples, false, true);
+ if constexpr (std::is_same_v< Stencil_T, stencil::D2Q9 > || std::is_same_v< Stencil_T, stencil::D3Q27 >)
+ {
+ WALBERLA_CHECK_LESS(l2Error, real_c(0.77));
+ }
+ // computation is less accurate if corner directions are not included (as opposed to D2Q9/D3Q27)
+ if constexpr (std::is_same_v< Stencil_T, stencil::D3Q19 >) { WALBERLA_CHECK_LESS(l2Error, real_c(0.79)); }
+
+ if constexpr (!std::is_same_v< Stencil_T, stencil::D2Q9 >)
+ {
+ WALBERLA_LOG_RESULT("Amplitude " << amplitude << " cells; curvature with local triangulation;");
+ l2Error = test< LatticeModel_T >(domainWidth, amplitude, offset, fillLevelInitSamples, true, false);
+ WALBERLA_CHECK_LESS(l2Error, real_c(0.8));
+
+ WALBERLA_LOG_RESULT("Amplitude "
+ << amplitude
+ << " cells; curvature with local triangulation; normal from analytical solution;");
+ l2Error = test< LatticeModel_T >(domainWidth, amplitude, offset, fillLevelInitSamples, true, true);
+ WALBERLA_CHECK_LESS(l2Error, real_c(0.8));
+ }
+ }
+
+ // test with various offsets
+ for (real_t i = real_c(0.4); i <= real_c(0.6); i += real_c(0.04))
+ {
+ const uint_t domainWidth = uint_c(100); // size of the domain in x- and y-direction
+ const real_t amplitude = real_c(0.2) * real_c(domainWidth); // amplitude of the sine profile
+ const real_t offset = i * real_c(domainWidth); // offset the sine profile in y-direction
+
+ WALBERLA_LOG_RESULT("Offset " << offset << " cells; curvature with finite difference method;");
+ l2Error = test< LatticeModel_T >(domainWidth, amplitude, offset, fillLevelInitSamples, false, false);
+ WALBERLA_CHECK_LESS(l2Error, real_c(0.72));
+
+ WALBERLA_LOG_RESULT(
+ "Offset " << offset << " cells; curvature with finite difference method; normal from analytical solution;");
+ l2Error = test< LatticeModel_T >(domainWidth, amplitude, offset, fillLevelInitSamples, false, true);
+ WALBERLA_CHECK_LESS(l2Error, real_c(0.73));
+
+ if constexpr (!std::is_same_v< Stencil_T, stencil::D2Q9 >)
+ {
+ WALBERLA_LOG_RESULT("Offset " << offset << " cells; curvature with local triangulation;");
+ l2Error = test< LatticeModel_T >(domainWidth, amplitude, offset, fillLevelInitSamples, true, false);
+ WALBERLA_CHECK_LESS(l2Error, real_c(0.699));
+
+ WALBERLA_LOG_RESULT(
+ "Offset " << offset << " cells; curvature with local triangulation; normal from analytical solution;");
+ l2Error = test< LatticeModel_T >(domainWidth, amplitude, offset, fillLevelInitSamples, true, true);
+ WALBERLA_CHECK_LESS(l2Error, real_c(0.706));
+ }
+ }
+}
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+
+ WALBERLA_LOG_RESULT("##################################");
+ WALBERLA_LOG_RESULT("### Testing with D2Q9 stencil. ###");
+ WALBERLA_LOG_RESULT("##################################");
+ runAllTests< lbm::D2Q9< lbm::collision_model::SRT > >();
+
+ WALBERLA_LOG_RESULT("###################################");
+ WALBERLA_LOG_RESULT("### Testing with D3Q19 stencil. ###");
+ WALBERLA_LOG_RESULT("###################################");
+ runAllTests< lbm::D3Q19< lbm::collision_model::SRT > >();
+
+ WALBERLA_LOG_RESULT("###################################");
+ WALBERLA_LOG_RESULT("### Testing with D3Q27 stencil. ###");
+ WALBERLA_LOG_RESULT("###################################");
+ runAllTests< lbm::D3Q27< lbm::collision_model::SRT > >();
+
+ return EXIT_SUCCESS;
+}
+} // namespace CurvatureOfSineTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::CurvatureOfSineTest::main(argc, argv); }
\ No newline at end of file
diff --git a/tests/lbm/free_surface/surface_geometry/CurvatureOfSphereTest.cpp b/tests/lbm/free_surface/surface_geometry/CurvatureOfSphereTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..1a42213e6188b2db7e74a6dabdd9066bd4c00326
--- /dev/null
+++ b/tests/lbm/free_surface/surface_geometry/CurvatureOfSphereTest.cpp
@@ -0,0 +1,373 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file CurvatureOfSphereTest.cpp
+//! \ingroup lbm/free_surface/surface_geometry
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Compare computed mean curvature of spherical gas bubbles with analytical curvature.
+//
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+#include "core/logging/Logging.h"
+#include "core/math/DistributedSample.h"
+
+#include "field/AddToStorage.h"
+
+#include "geometry/bodies/Sphere.h"
+
+#include "lbm/blockforest/communication/SimpleCommunication.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface/boundary/FreeSurfaceBoundaryHandling.h"
+#include "lbm/free_surface/surface_geometry/ContactAngle.h"
+#include "lbm/free_surface/surface_geometry/CurvatureSweep.h"
+#include "lbm/free_surface/surface_geometry/ExtrapolateNormalsSweep.h"
+#include "lbm/free_surface/surface_geometry/NormalSweep.h"
+#include "lbm/free_surface/surface_geometry/SmoothingSweep.h"
+#include "lbm/lattice_model/CollisionModel.h"
+#include "lbm/lattice_model/D3Q19.h"
+#include "lbm/lattice_model/D3Q27.h"
+
+#include "timeloop/SweepTimeloop.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace CurvatureOfSphereTest
+{
+// define types
+using flag_t = uint32_t;
+
+// define fields
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+using FlagField_T = FlagField< flag_t >;
+
+template< typename Stencil_T >
+class ComputeAnalyticalNormal
+{
+ public:
+ ComputeAnalyticalNormal(const std::weak_ptr< const StructuredBlockForest >& blockForest,
+ const BlockDataID& normalField, const ConstBlockDataID& flagField,
+ const field::FlagUID& interfaceFlag, const Vector3< real_t > sphereMidpoint)
+ : blockForest_(blockForest), normalFieldID_(normalField), flagFieldID_(flagField),
+ interfaceFlagID_(interfaceFlag), sphereMidpoint_(sphereMidpoint)
+ {}
+
+ void operator()(IBlock* const block)
+ {
+ const auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ // get fields
+ const FlagField_T* const flagField = block->getData< const FlagField_T >(flagFieldID_);
+ VectorField_T* const normalField = block->getData< VectorField_T >(normalFieldID_);
+
+ flag_t interfaceFlag = flagField->getFlag(interfaceFlagID_);
+
+ WALBERLA_FOR_ALL_CELLS(flagFieldIt, flagField, normalFieldIt, normalField, {
+ // evaluate normal only in interface cell (and possibly in an interface cell's neighborhood)
+ if (isFlagSet(flagFieldIt, interfaceFlag) ||
+ field::isFlagInNeighborhood< Stencil_T >(flagFieldIt, interfaceFlag))
+ {
+ // get a vector pointing from sphere's center to current cell's center
+ Vector3< real_t > r;
+
+ // get the global coordinate of the current cell's center
+ blockForest->getBlockLocalCellCenter(*block, flagFieldIt.cell(), r);
+ r -= sphereMidpoint_;
+
+ // invert normal direction: in this FSLBM implementation, the normal vector is defined to point from liquid
+ // to gas
+ r *= real_c(-1);
+ normalize(r);
+
+ // store analytical normal
+ *normalFieldIt = r;
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ private:
+ std::weak_ptr< const StructuredBlockForest > blockForest_;
+
+ BlockDataID normalFieldID_;
+ ConstBlockDataID flagFieldID_;
+ field::FlagUID interfaceFlagID_;
+
+ Vector3< real_t > sphereMidpoint_;
+}; // class ComputeAnalyticalNormal
+
+class ComputeCurvatureError
+{
+ public:
+ ComputeCurvatureError(const std::weak_ptr< const StructuredBlockForest >& blockForest,
+ const ConstBlockDataID& curvatureFieldID, const ConstBlockDataID& flagFieldID,
+ const field::FlagUID& interfaceFlagID, real_t sphereDiameter,
+ const Vector3< uint_t >& domainSize, const std::shared_ptr< real_t >& l2Error)
+ : blockForest_(blockForest), curvatureFieldID_(curvatureFieldID), flagFieldID_(flagFieldID),
+ interfaceFlagID_(interfaceFlagID), sphereDiameter_(sphereDiameter), domainSize_(domainSize), l2Error_(l2Error)
+ {}
+
+ void operator()(IBlock* const block)
+ {
+ const auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ // get fields
+ const ScalarField_T* const curvatureField = block->getData< const ScalarField_T >(curvatureFieldID_);
+ const FlagField_T* const flagField = block->getData< const FlagField_T >(flagFieldID_);
+
+ const flag_t interfaceFlag = flagField->getFlag(interfaceFlagID_);
+
+ const real_t analyticalCurvature = real_c(-1) / (real_c(0.5) * real_c(sphereDiameter_));
+
+ real_t curvDiffSum2 = real_c(0);
+ real_t analCurvSum2 = real_c(0);
+
+ WALBERLA_FOR_ALL_CELLS_OMP(flagFieldIt, flagField, curvatureFieldIt, curvatureField,
+ omp parallel for schedule(static) reduction(+:curvDiffSum2) reduction(+:analCurvSum2),
+ {
+ // skip non-interface cells
+ if (isFlagSet(flagFieldIt, interfaceFlag))
+ {
+ const real_t curvDiff = *curvatureFieldIt - analyticalCurvature;
+ curvDiffSum2 += curvDiff * curvDiff;
+ analCurvSum2 += analyticalCurvature * analyticalCurvature;
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_OMP
+
+ mpi::allReduceInplace< real_t >(curvDiffSum2, mpi::SUM);
+ mpi::allReduceInplace< real_t >(analCurvSum2, mpi::SUM);
+
+ *l2Error_ = std::pow(curvDiffSum2 / analCurvSum2, real_c(0.5));
+
+ WALBERLA_LOG_RESULT("Relative error in curvature according to L2 norm = " << *l2Error_);
+ }
+
+ private:
+ std::weak_ptr< const StructuredBlockForest > blockForest_;
+
+ ConstBlockDataID curvatureFieldID_;
+ ConstBlockDataID flagFieldID_;
+ field::FlagUID interfaceFlagID_;
+
+ real_t sphereDiameter_;
+ Vector3< uint_t > domainSize_;
+
+ std::shared_ptr< real_t > l2Error_;
+}; // class ComputeCurvatureError
+
+template< typename LatticeModel_T >
+real_t test(uint_t sphereDiameter, Vector3< real_t > offset, bool useTriangulation, bool useAnalyticalNormal)
+{
+ // define types
+ using Stencil_T = typename LatticeModel_T::Stencil;
+ using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+ using Communication_T = blockforest::SimpleCommunication< typename LatticeModel_T::CommunicationStencil >;
+
+ // define the domain size
+ const Vector3< uint_t > numBlocks(uint_c(1));
+ const Vector3< uint_t > domainSize(sphereDiameter + uint_c(6));
+ const Vector3< uint_t > cellsPerBlock(domainSize[0] / numBlocks[0], domainSize[1] / numBlocks[1],
+ domainSize[2] / numBlocks[2]);
+
+ // create block grid
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ blockforest::createUniformBlockGrid(numBlocks[0], numBlocks[1], numBlocks[2], // blocks
+ cellsPerBlock[0], cellsPerBlock[1], cellsPerBlock[2], // cells
+ real_c(1.0), // dx
+ true, // one block per process
+ false, false, false); // periodicity
+
+ // create lattice model with omega=1
+ LatticeModel_T latticeModel(real_c(1.0));
+
+ // add fields
+ BlockDataID pdfFieldID =
+ lbm::addPdfFieldToStorage< LatticeModel_T >(blockForest, "PDF field", latticeModel, field::fzyx);
+ BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill levels", real_c(1.0), field::fzyx, uint_c(1));
+ BlockDataID normalFieldID = field::addToStorage< VectorField_T >(
+ blockForest, "Normals", Vector3< real_t >(real_c(0)), field::fzyx, uint_c(1));
+ BlockDataID curvatureFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Curvature", real_c(0), field::fzyx, uint_c(1));
+ BlockDataID smoothFillFieldID;
+
+ // obstacle normal field is only a dummy field here (wetting effects are not considered in this test)
+ BlockDataID dummyObstNormalFieldID = field::addToStorage< VectorField_T >(
+ blockForest, "Dummy obstacle normal field", Vector3< real_t >(real_c(0)), field::fzyx, uint_c(1));
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+
+ // add gas sphere, i.e., bubble
+ Vector3< real_t > midpoint(real_c(domainSize[0]) * real_c(0.5), real_c(domainSize[1]) * real_c(0.5),
+ real_c(domainSize[2]) * real_c(0.5));
+ geometry::Sphere sphere(midpoint + offset, real_c(sphereDiameter) * real_c(0.5));
+ freeSurfaceBoundaryHandling->addFreeSurfaceObject(sphere);
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+
+ // contact angle is only a dummy object here (wetting effects are not considered in this test)
+ ContactAngle dummyContactAngle(real_c(0));
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, uint_c(1));
+
+ BlockDataID* relevantFillFieldID = &fillFieldID;
+
+ if (useAnalyticalNormal)
+ {
+ // add sweep for getting analytical interface normal
+ ComputeAnalyticalNormal< Stencil_T > analyticalNormalSweep(blockForest, normalFieldID, flagFieldID,
+ flagIDs::interfaceFlagID, midpoint);
+ timeloop.add() << Sweep(analyticalNormalSweep, "Analytical normal sweep")
+ << AfterFunction(Communication_T(blockForest, normalFieldID),
+ "Communication after analytical normal sweep");
+ }
+ else
+ {
+ if (!useTriangulation)
+ {
+ smoothFillFieldID = field::addToStorage< ScalarField_T >(blockForest, "Smooth fill levels", real_c(1.0),
+ field::fzyx, uint_c(1));
+
+ // add sweep for smoothing the fill level field when not using local triangulation
+ SmoothingSweep< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > smoothingSweep(
+ smoothFillFieldID, fillFieldID, flagFieldID, flagIDs::liquidInterfaceGasFlagIDs,
+ freeSurfaceBoundaryHandling->getFlagInfo().getObstacleIDSet(), false);
+ timeloop.add() << Sweep(smoothingSweep, "Smoothing sweep")
+ << AfterFunction(Communication_T(blockForest, smoothFillFieldID),
+ "Communication after smoothing sweep");
+
+ relevantFillFieldID = &smoothFillFieldID;
+ }
+
+ NormalSweep< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > normalsSweep(
+ normalFieldID, *relevantFillFieldID, flagFieldID, flagIDs::interfaceFlagID, flagIDs::liquidInterfaceGasFlagIDs,
+ freeSurfaceBoundaryHandling->getFlagInfo().getObstacleIDSet(), true, false, false, false);
+ timeloop.add() << Sweep(normalsSweep, "Normal sweep")
+ << AfterFunction(Communication_T(blockForest, normalFieldID), "Communication after normal sweep");
+ }
+
+ if (useTriangulation) // use local triangulation for curvature computation
+ {
+ CurvatureSweepLocalTriangulation< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > curvatureSweep(
+ blockForest, curvatureFieldID, normalFieldID, fillFieldID, flagFieldID, dummyObstNormalFieldID,
+ flagIDs::interfaceFlagID, freeSurfaceBoundaryHandling->getFlagInfo().getObstacleIDSet(), false,
+ dummyContactAngle);
+ timeloop.add() << Sweep(curvatureSweep, "Curvature sweep");
+ }
+ else // use finite differences for curvature computation
+ {
+ CurvatureSweepFiniteDifferences< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > curvatureSweep(
+ curvatureFieldID, normalFieldID, dummyObstNormalFieldID, flagFieldID, flagIDs::interfaceFlagID,
+ flagIDs::liquidInterfaceGasFlagIDs, freeSurfaceBoundaryHandling->getFlagInfo().getObstacleIDSet(), false,
+ dummyContactAngle);
+ timeloop.add() << Sweep(curvatureSweep, "Curvature sweep");
+ }
+
+ const std::shared_ptr< real_t > l2Error = std::make_shared< real_t >(real_c(0));
+ ComputeCurvatureError errorEvaluationSweep(blockForest, curvatureFieldID, flagFieldID, flagIDs::interfaceFlagID,
+ real_c(sphereDiameter), domainSize, l2Error);
+ timeloop.add() << Sweep(errorEvaluationSweep, "Error evaluation sweep");
+
+ // perform a single time step
+ timeloop.singleStep();
+
+ MPIManager::instance()->resetMPI();
+
+ return *l2Error;
+}
+
+template< typename LatticeModel_T >
+void runAllTests()
+{
+ real_t l2Error;
+
+ // test with various bubble diameters
+ for (uint_t diameter = uint_c(10); diameter <= uint_c(50); diameter += uint_c(10))
+ {
+ WALBERLA_LOG_RESULT("Bubble diameter " << diameter << " cells; curvature with finite difference method;")
+ l2Error = test< LatticeModel_T >(diameter, Vector3< real_t >(real_c(0), real_c(0), real_c(0)), false, false);
+ WALBERLA_CHECK_LESS(l2Error, real_c(0.2));
+
+ WALBERLA_LOG_RESULT("Bubble diameter "
+ << diameter
+ << " cells; curvature with finite difference method; normal from analytical solution;")
+ l2Error = test< LatticeModel_T >(diameter, Vector3< real_t >(real_c(0), real_c(0), real_c(0)), false, true);
+ WALBERLA_CHECK_LESS(l2Error, real_c(0.19));
+
+ WALBERLA_LOG_RESULT("Bubble diameter " << diameter << " cells; curvature with local triangulation;")
+ l2Error = test< LatticeModel_T >(diameter, Vector3< real_t >(real_c(0), real_c(0), real_c(0)), true, false);
+ WALBERLA_CHECK_LESS(l2Error, real_c(0.29));
+
+ WALBERLA_LOG_RESULT("Bubble diameter "
+ << diameter << " cells; curvature with local triangulation; normal from analytical solution;")
+ l2Error = test< LatticeModel_T >(diameter, Vector3< real_t >(real_c(0), real_c(0), real_c(0)), true, true);
+ WALBERLA_CHECK_LESS(l2Error, real_c(0.29));
+ }
+
+ // test with various offsets of sphere's center
+ for (real_t off = real_c(0.1); off < real_c(1.0); off += real_c(0.2))
+ {
+ WALBERLA_LOG_RESULT("Sphere center offset " << off << " cells; curvature with finite difference method;")
+ l2Error = test< LatticeModel_T >(uint_c(20), Vector3< real_t >(off, off, real_c(0)), false, false);
+ WALBERLA_CHECK_LESS(l2Error, real_c(0.82));
+
+ WALBERLA_LOG_RESULT("Sphere center offset "
+ << off << " cells; curvature with finite difference method; normal from analytical solution;")
+ l2Error = test< LatticeModel_T >(uint_c(20), Vector3< real_t >(off, off, real_c(0)), false, true);
+ WALBERLA_CHECK_LESS(l2Error, real_c(0.83));
+
+ WALBERLA_LOG_RESULT("Sphere center offset " << off << " cells; curvature with local triangulation;")
+ l2Error = test< LatticeModel_T >(uint_c(20), Vector3< real_t >(off, off, real_c(0)), true, false);
+ WALBERLA_CHECK_LESS(l2Error, real_c(0.13));
+
+ WALBERLA_LOG_RESULT("Sphere center offset "
+ << off << " cells; curvature with local triangulation; normal from analytical solution;")
+ l2Error = test< LatticeModel_T >(uint_c(20), Vector3< real_t >(off, off, real_c(0)), true, true);
+ WALBERLA_CHECK_LESS(l2Error, real_c(0.16));
+ }
+}
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+
+ WALBERLA_LOG_RESULT("###################################");
+ WALBERLA_LOG_RESULT("### Testing with D3Q19 stencil. ###");
+ WALBERLA_LOG_RESULT("###################################");
+ runAllTests< lbm::D3Q19< lbm::collision_model::SRT > >();
+
+ WALBERLA_LOG_RESULT("###################################");
+ WALBERLA_LOG_RESULT("### Testing with D3Q27 stencil. ###");
+ WALBERLA_LOG_RESULT("###################################");
+ runAllTests< lbm::D3Q27< lbm::collision_model::SRT > >();
+
+ return EXIT_SUCCESS;
+}
+} // namespace CurvatureOfSphereTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::CurvatureOfSphereTest::main(argc, argv); }
\ No newline at end of file
diff --git a/tests/lbm/free_surface/surface_geometry/DetectWettingTest.cpp b/tests/lbm/free_surface/surface_geometry/DetectWettingTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..4c86d76ad67cdbc9a3db4544b9eac2e82808d1fc
--- /dev/null
+++ b/tests/lbm/free_surface/surface_geometry/DetectWettingTest.cpp
@@ -0,0 +1,294 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file DetectWettingTest.cpp
+//! \ingroup lbm/free_surface/surface_geometry
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Test the DetectWettingSweep using a single interface cell surrounded by gas cells and obstacle cells.
+//!
+//! 3x4x3 domain where the first and fourth layer in y-direction are solid cells. The cell at (1,1,1) is an interface
+//! cell with given normal and fill level. All remaining cells are gas cells that might be marked for conversion to
+//! wetting cells by DetectWettingSweep.
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface/boundary/FreeSurfaceBoundaryHandling.h"
+#include "lbm/free_surface/surface_geometry/DetectWettingSweep.h"
+#include "lbm/lattice_model/D3Q19.h"
+
+#include "timeloop/SweepTimeloop.h"
+
+#include <algorithm>
+#include <vector>
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace DetectWettingTest
+{
+using LatticeModel_T = lbm::D3Q19< lbm::collision_model::SRT >;
+using PdfField_T = lbm::PdfField< LatticeModel_T >;
+using Stencil_T = LatticeModel_T::Stencil;
+
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+
+using flag_t = uint32_t;
+using FlagField_T = FlagField< flag_t >;
+using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+std::vector< Cell > detectWettingCells(const Vector3< real_t >& normal, const real_t fillLevel)
+{
+ // define the domain size
+ const Vector3< uint_t > numBlocks(uint_c(1));
+ const Vector3< uint_t > domainSize(uint_c(3), uint_c(4), uint_c(3));
+ const Vector3< uint_t > cellsPerBlock(domainSize[0] / numBlocks[0], domainSize[1] / numBlocks[1],
+ domainSize[2] / numBlocks[2]);
+
+ // create block grid
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ blockforest::createUniformBlockGrid(numBlocks[0], numBlocks[1], numBlocks[2], // blocks
+ cellsPerBlock[0], cellsPerBlock[1], cellsPerBlock[2], // cells
+ real_c(1.0), // dx
+ true, // one block per process
+ false, false, false); // periodicity
+
+ // create lattice model (dummy, not relevant for this test)
+ LatticeModel_T latticeModel = LatticeModel_T(lbm::collision_model::SRT(real_c(1)));
+
+ // add fields
+ const BlockDataID pdfFieldID = lbm::addPdfFieldToStorage(blockForest, "PDF field", latticeModel, field::fzyx);
+ const BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill level field", real_c(0.0), field::fzyx, uint_c(1));
+ const BlockDataID normalFieldID = field::addToStorage< VectorField_T >(
+ blockForest, "Normal field", Vector3< real_t >(real_c(0.0)), field::fzyx, uint_c(1));
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const BlockDataID boundaryHandlingID = freeSurfaceBoundaryHandling->getHandlingID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ // initialize domain
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ ScalarField_T* const fillField = blockIt->getData< ScalarField_T >(fillFieldID);
+ VectorField_T* const normalField = blockIt->getData< VectorField_T >(normalFieldID);
+ FreeSurfaceBoundaryHandling_T::BoundaryHandling_T* const boundaryHandling =
+ blockIt->getData< FreeSurfaceBoundaryHandling_T::BoundaryHandling_T >(boundaryHandlingID);
+
+ WALBERLA_FOR_ALL_CELLS_XYZ(fillField, {
+ // set boundary cells at bottom and top of domain
+ if (y == 0 || y == 3) { boundaryHandling->setBoundary(FreeSurfaceBoundaryHandling_T::noSlipFlagID, x, y, z); }
+
+ // set interface cell in the center of the domain
+ if (x == 1 && y == 1 && z == 1)
+ {
+ boundaryHandling->setFlag(flagInfo.interfaceFlag, x, y, z);
+ fillField->get(x, y, z) = fillLevel;
+ normalField->get(x, y, z) = normal.getNormalized();
+ }
+
+ // set remaining domain to gas
+ if ((y == 1 || y == 2) && !(x == 1 && y == 1 && z == 1))
+ {
+ boundaryHandling->setFlag(flagInfo.gasFlag, x, y, z);
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_XYZ
+ }
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, 1);
+
+ // add DetectWettingSweep
+ DetectWettingSweep< Stencil_T, FreeSurfaceBoundaryHandling_T::BoundaryHandling_T, FlagField_T, ScalarField_T,
+ VectorField_T >
+ detWetSweep(boundaryHandlingID, flagInfo, normalFieldID, fillFieldID);
+ timeloop.add() << Sweep(detWetSweep, "Detect wetting sweep");
+
+ timeloop.singleStep();
+
+ std::vector< Cell > markedCells;
+
+ // get cells that were marked by DetectWettingSweep
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ const FlagField_T* const flagField = blockIt->getData< const FlagField_T >(flagFieldID);
+
+ WALBERLA_FOR_ALL_CELLS_OMP(
+ flagFieldIt, flagField, omp critical, if (flagInfo.isKeepInterfaceForWetting(flagFieldIt)) {
+ markedCells.emplace_back(flagFieldIt.cell());
+ }) // WALBERLA_FOR_ALL_CELLS_OMP
+ }
+
+ return markedCells;
+}
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+
+ Vector3< real_t > normal;
+ real_t fillLevel;
+ std::vector< Cell > expectedWettingCells;
+ std::vector< Cell > computedWettingCells;
+ bool vectorsEqual;
+
+ // test various different normals and fill levels; expected results have been determined using ParaView
+ normal = Vector3< real_t >(real_c(1), real_c(1), real_c(1));
+ fillLevel = real_c(0.01);
+ expectedWettingCells = std::vector< Cell >{ Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(1)) };
+ WALBERLA_LOG_INFO("Testing wetting cells with normal=" << normal << " and fill level=" << fillLevel);
+ computedWettingCells = detectWettingCells(normal, fillLevel);
+ vectorsEqual = std::is_permutation(computedWettingCells.begin(), computedWettingCells.end(),
+ expectedWettingCells.begin(), expectedWettingCells.end());
+ if (!vectorsEqual) { WALBERLA_ABORT("Wrong cells converted."); }
+
+ normal = Vector3< real_t >(real_c(-1), real_c(-1), real_c(-1));
+ fillLevel = real_c(0.01);
+ expectedWettingCells = std::vector< Cell >{
+ Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(1)), Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(1)),
+ Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(1)), Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(2)),
+ Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(2)), Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(2))
+ };
+ WALBERLA_LOG_INFO("Testing wetting cells with normal=" << normal << " and fill level=" << fillLevel);
+ computedWettingCells = detectWettingCells(normal, fillLevel);
+ vectorsEqual = std::is_permutation(computedWettingCells.begin(), computedWettingCells.end(),
+ expectedWettingCells.begin(), expectedWettingCells.end());
+ if (!vectorsEqual) { WALBERLA_ABORT("Wrong cells converted."); }
+
+ normal = Vector3< real_t >(real_c(1), real_c(1), real_c(0));
+ fillLevel = real_c(0.01);
+ expectedWettingCells = std::vector< Cell >{ Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(1)),
+ Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(2)),
+ Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(2)) };
+ WALBERLA_LOG_INFO("Testing wetting cells with normal=" << normal << " and fill level=" << fillLevel);
+ computedWettingCells = detectWettingCells(normal, fillLevel);
+ vectorsEqual = std::is_permutation(computedWettingCells.begin(), computedWettingCells.end(),
+ expectedWettingCells.begin(), expectedWettingCells.end());
+ if (!vectorsEqual) { WALBERLA_ABORT("Wrong cells converted."); }
+
+ normal = Vector3< real_t >(real_c(0), real_c(1), real_c(1));
+ fillLevel = real_c(0.01);
+ expectedWettingCells = std::vector< Cell >{ Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(1)),
+ Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(1)) };
+ WALBERLA_LOG_INFO("Testing wetting cells with normal=" << normal << " and fill level=" << fillLevel);
+ computedWettingCells = detectWettingCells(normal, fillLevel);
+ vectorsEqual = std::is_permutation(computedWettingCells.begin(), computedWettingCells.end(),
+ expectedWettingCells.begin(), expectedWettingCells.end());
+ if (!vectorsEqual) { WALBERLA_ABORT("Wrong cells converted."); }
+
+ normal = Vector3< real_t >(real_c(1), real_c(0), real_c(1));
+ fillLevel = real_c(0.01);
+ expectedWettingCells = std::vector< Cell >{ Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(0)),
+ Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(1)),
+ Cell(cell_idx_c(0), cell_idx_c(2), cell_idx_c(1)),
+ Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(1)) };
+ WALBERLA_LOG_INFO("Testing wetting cells with normal=" << normal << " and fill level=" << fillLevel);
+ computedWettingCells = detectWettingCells(normal, fillLevel);
+ vectorsEqual = std::is_permutation(computedWettingCells.begin(), computedWettingCells.end(),
+ expectedWettingCells.begin(), expectedWettingCells.end());
+ if (!vectorsEqual) { WALBERLA_ABORT("Wrong cells converted."); }
+
+ normal = Vector3< real_t >(real_c(-1), real_c(0), real_c(-1));
+ fillLevel = real_c(0.01);
+ expectedWettingCells = std::vector< Cell >{ Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(1)),
+ Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(1)),
+ Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(1)),
+ Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(2)),
+ Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(2)) };
+ WALBERLA_LOG_INFO("Testing wetting cells with normal=" << normal << " and fill level=" << fillLevel);
+ computedWettingCells = detectWettingCells(normal, fillLevel);
+ vectorsEqual = std::is_permutation(computedWettingCells.begin(), computedWettingCells.end(),
+ expectedWettingCells.begin(), expectedWettingCells.end());
+ if (!vectorsEqual) { WALBERLA_ABORT("Wrong cells converted."); }
+
+ normal = Vector3< real_t >(real_c(-1), real_c(0), real_c(-1));
+ fillLevel = real_c(0.5);
+ expectedWettingCells = std::vector< Cell >{ Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(0)),
+ Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(1)),
+ Cell(cell_idx_c(0), cell_idx_c(2), cell_idx_c(1)),
+ Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(1)) };
+ WALBERLA_LOG_INFO("Testing wetting cells with normal=" << normal << " and fill level=" << fillLevel);
+ computedWettingCells = detectWettingCells(normal, fillLevel);
+ vectorsEqual = std::is_permutation(computedWettingCells.begin(), computedWettingCells.end(),
+ expectedWettingCells.begin(), expectedWettingCells.end());
+ if (!vectorsEqual) { WALBERLA_ABORT("Wrong cells converted."); }
+
+ normal = Vector3< real_t >(real_c(1), real_c(1), real_c(1));
+ fillLevel = real_c(0.9);
+ expectedWettingCells = std::vector< Cell >{
+ Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(1)), Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(1)),
+ Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(1)), Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(2)),
+ Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(2)), Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(2))
+ };
+ WALBERLA_LOG_INFO("Testing wetting cells with normal=" << normal << " and fill level=" << fillLevel);
+ computedWettingCells = detectWettingCells(normal, fillLevel);
+ vectorsEqual = std::is_permutation(computedWettingCells.begin(), computedWettingCells.end(),
+ expectedWettingCells.begin(), expectedWettingCells.end());
+ if (!vectorsEqual) { WALBERLA_ABORT("Wrong cells converted."); }
+
+ normal = Vector3< real_t >(real_c(1), real_c(1), real_c(0));
+ fillLevel = real_c(0.9);
+ expectedWettingCells = std::vector< Cell >{
+ Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)), Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(0)), Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(1)),
+ Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(1)), Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(2)),
+ Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(2)), Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(2))
+ };
+ WALBERLA_LOG_INFO("Testing wetting cells with normal=" << normal << " and fill level=" << fillLevel);
+ computedWettingCells = detectWettingCells(normal, fillLevel);
+ vectorsEqual = std::is_permutation(computedWettingCells.begin(), computedWettingCells.end(),
+ expectedWettingCells.begin(), expectedWettingCells.end());
+ if (!vectorsEqual) { WALBERLA_ABORT("Wrong cells converted."); }
+
+ normal = Vector3< real_t >(real_c(0), real_c(1), real_c(0));
+ fillLevel = real_c(0.9);
+ expectedWettingCells = std::vector< Cell >{
+ Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(0)), Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)),
+ Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(0)), Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(1)),
+ Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(1)), Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(2)),
+ Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(2)), Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(2))
+ };
+ WALBERLA_LOG_INFO("Testing wetting cells with normal=" << normal << " and fill level=" << fillLevel);
+ computedWettingCells = detectWettingCells(normal, fillLevel);
+ vectorsEqual = std::is_permutation(computedWettingCells.begin(), computedWettingCells.end(),
+ expectedWettingCells.begin(), expectedWettingCells.end());
+ if (!vectorsEqual) { WALBERLA_ABORT("Wrong cells converted."); }
+
+ return EXIT_SUCCESS;
+}
+} // namespace DetectWettingTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::DetectWettingTest::main(argc, argv); }
\ No newline at end of file
diff --git a/tests/lbm/free_surface/surface_geometry/GetInterfacePointTest.cpp b/tests/lbm/free_surface/surface_geometry/GetInterfacePointTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..7123e9ba797fc84c708ac0f8f0ac2d82a54de755
--- /dev/null
+++ b/tests/lbm/free_surface/surface_geometry/GetInterfacePointTest.cpp
@@ -0,0 +1,76 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file GetInterfacePointTest.cpp
+//! \ingroup lbm/free_surface/surface_geometry
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Compute the interface point from normal and fill level, and compare with results obtained with ParaView.
+//
+//======================================================================================================================
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+
+#include "lbm/free_surface/surface_geometry/CurvatureSweep.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace GetInterfacePointTest
+{
+inline void test(const Vector3< real_t >& normal, real_t fillLevel, Vector3< real_t > expectedInterfacePoint,
+ real_t tolerance)
+{
+ const Vector3< real_t > interfacePoint = getInterfacePoint(normal, fillLevel);
+
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(interfacePoint[0], expectedInterfacePoint[0], tolerance);
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(interfacePoint[1], expectedInterfacePoint[1], tolerance);
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(interfacePoint[2], expectedInterfacePoint[2], tolerance);
+}
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+
+ // allowed deviation from the expected result
+ real_t tolerance = real_c(1e-2);
+
+ // tests identical to those in CellFluidVolumeTest.cpp, results obtained with ParaView
+ Vector3< real_t > normal(real_c(0), real_c(0.5), real_c(0.866));
+ const real_t offset = real_c(-0.1);
+ const real_t fillLevel = real_c(0.3845);
+ Vector3< real_t > expectedInterfacePoint = Vector3< real_t >(real_c(0.5)) + offset * normal;
+ test(normal, fillLevel, expectedInterfacePoint, tolerance);
+
+ normal = Vector3< real_t >(real_c(0.37), real_c(0.61), real_c(0.7));
+ const std::vector< real_t > offsetList{ real_c(-0.52), real_c(-0.3), real_c(-0.17), real_c(0) };
+ const std::vector< real_t > fillLevelList{ real_c(0.0347), real_c(0.1612), real_c(0.2887), real_c(0.5) };
+
+ WALBERLA_ASSERT_EQUAL(offsetList.size(), fillLevelList.size());
+ for (size_t i = 0; i != offsetList.size(); ++i)
+ {
+ expectedInterfacePoint = Vector3< real_t >(real_c(0.5)) + offset * normal;
+ test(normal, fillLevel, expectedInterfacePoint, tolerance);
+ }
+
+ return EXIT_SUCCESS;
+}
+} // namespace GetInterfacePointTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::GetInterfacePointTest::main(argc, argv); }
diff --git a/tests/lbm/free_surface/surface_geometry/NormalsEquivalenceTest.cpp b/tests/lbm/free_surface/surface_geometry/NormalsEquivalenceTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..c7b5fbd3f32333465b5fc5d91dfcd4ba4433982a
--- /dev/null
+++ b/tests/lbm/free_surface/surface_geometry/NormalsEquivalenceTest.cpp
@@ -0,0 +1,213 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file NormalsEquivalenceTest.cpp
+//! \ingroup lbm/free_surface/surface_geometry
+//! \author Matthias Markl <matthias.markl@fau.de>
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Test if the NormalSweep (unrolled version) is equal to a loop-based computation of the interface normal.
+//!
+//! Test (with respect to a maximum error of 1e-13) if the explicit normal computation (implemented in NormalSweep)
+//! gives the same result as the loop-based computation of the interface normal. The former method is faster and does
+//! not loop over all D3Q27 directions but calculates the interface normal explicitly. See function computeNormal() in
+//! src/lbm/free_surface/surface_geometry/NormalSweep.impl.h
+//
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+
+#include "field/AddToStorage.h"
+
+#include "lbm/blockforest/communication/SimpleCommunication.h"
+#include "lbm/free_surface/FlagInfo.h"
+#include "lbm/free_surface/surface_geometry/NormalSweep.h"
+
+#include "stencil/D3Q27.h"
+
+#include "timeloop/SweepTimeloop.h"
+
+#include <cstdlib>
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace NormalsEquivalenceTest
+{
+// define types
+using Stencil_T = stencil::D3Q27;
+using flag_t = uint32_t;
+
+// define fields
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+using FlagField_T = FlagField< flag_t >;
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+
+ // define the domain size
+ const Vector3< uint_t > numBlocks(uint_c(1));
+ const Vector3< uint_t > domainSize(uint_c(32), uint_c(32), uint_c(32));
+ const Vector3< uint_t > cellsPerBlock(domainSize[0] / numBlocks[0], domainSize[1] / numBlocks[1],
+ domainSize[2] / numBlocks[2]);
+
+ // create block grid
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ blockforest::createUniformBlockGrid(numBlocks[0], numBlocks[1], numBlocks[2], // blocks
+ cellsPerBlock[0], cellsPerBlock[1], cellsPerBlock[2], // cells
+ real_c(1.0), // dx
+ true, // one block per process
+ true, true, true); // periodicity
+
+ // add fields
+ BlockDataID flagFieldID = field::addFlagFieldToStorage< FlagField_T >(blockForest, "Flags", uint_c(2));
+ BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill levels", real_c(0), field::fzyx, uint_c(1));
+ BlockDataID normalFieldLoopID = field::addToStorage< VectorField_T >(
+ blockForest, "Normals loop", Vector3< real_t >(real_c(0)), field::fzyx, uint_c(1));
+ BlockDataID normalFieldExplID = field::addToStorage< VectorField_T >(
+ blockForest, "Normals explicit", Vector3< real_t >(real_c(0)), field::fzyx, uint_c(1));
+
+ // add boundary handling
+ const auto flagInfo = FlagInfo< FlagField_T >(Set< FlagUID >(), Set< FlagUID >());
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ flagInfo.registerFlags(blockIt->getData< FlagField_T >(flagFieldID));
+ }
+ WALBERLA_ASSERT(flagInfo.isConsistentAcrossBlocksAndProcesses(blockForest, flagFieldID));
+
+ // add communication
+ blockforest::SimpleCommunication< stencil::D3Q27 > commFill(blockForest, fillFieldID);
+ blockforest::SimpleCommunication< stencil::D3Q27 > commFlag(blockForest, flagFieldID);
+
+ // initialize flag field (only interface cells) and fill levels (random values)
+ std::srand(static_cast< unsigned int >(std::time(nullptr)));
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ ScalarField_T* const fillField = blockIt->getData< ScalarField_T >(fillFieldID);
+ FlagField_T* const flagField = blockIt->getData< FlagField_T >(flagFieldID);
+
+ // set whole flag field to interface
+ flagField->set(flagInfo.interfaceFlag);
+
+ // set random fill levels in fill field
+ WALBERLA_FOR_ALL_CELLS(fillFieldIt, fillField, {
+ *fillFieldIt = real_c(std::rand()) / real_c(std::numeric_limits< int >::max());
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ // communicate fill level field, and flag field
+ commFill();
+ commFlag();
+
+ // loop-based normal computation, i.e., old and slower version of NormalSweep operator()
+ auto normalsFunc = [&](IBlock* block) {
+ // get fields
+ VectorField_T* const normalField = block->getData< VectorField_T >(normalFieldLoopID);
+ const ScalarField_T* const fillField = block->getData< const ScalarField_T >(fillFieldID);
+ const FlagField_T* const flagField = block->getData< const FlagField_T >(flagFieldID);
+
+ WALBERLA_FOR_ALL_CELLS(normalFieldIt, normalField, fillFieldIt, fillField, flagFieldIt, flagField, {
+ bool computeNormalInCell = flagInfo.isInterface(flagFieldIt);
+
+ Vector3< real_t >& normal = *normalFieldIt;
+
+ if (computeNormalInCell)
+ {
+ if (!isFlagInNeighborhood< stencil::D3Q27 >(flagFieldIt, flagInfo.obstacleFlagMask))
+ {
+ normal.set(real_c(0), real_c(0), real_c(0));
+
+ // loop over all directions to compute interface normal; compare this loop with the explicit (non-loop)
+ // computation in function computeNormal() in src/lbm/free_surface/surface_geometry/NormalSweep.impl.h
+ for (auto d = stencil::D3Q27::beginNoCenter(); d != stencil::D3Q27::end(); ++d)
+ {
+ const real_t weightedFill =
+ real_c(stencil::gaussianMultipliers[d.toIdx()]) * fillFieldIt.neighbor(*d);
+ normal[0] += real_c(d.cx()) * weightedFill;
+ normal[1] += real_c(d.cy()) * weightedFill;
+ normal[2] += real_c(d.cz()) * weightedFill;
+ }
+ }
+
+ // normalize and negate normal (to make it point from gas to liquid)
+ normal = real_c(-1) * normal.getNormalizedOrZero();
+ }
+ else { normal.set(real_c(0), real_c(0), real_c(0)); }
+ }) // WALBERLA_FOR_ALL_CELLS
+ };
+
+ real_t err_max = real_c(0);
+ real_t err_mean = real_c(0);
+
+#ifdef WALBERLA_DOUBLE_ACCURACY
+ real_t tolerance = real_c(1e-13);
+#else
+ real_t tolerance = real_c(1e-4);
+#endif
+
+ auto evaluateError = [&](IBlock* block) {
+ const VectorField_T* const loopField = block->getData< const VectorField_T >(normalFieldLoopID);
+ const VectorField_T* const explField = block->getData< const VectorField_T >(normalFieldExplID);
+
+ err_mean = real_c(0);
+ err_max = real_c(0);
+
+ WALBERLA_FOR_ALL_CELLS(loopFieldIt, loopField, explFieldIt, explField, {
+ const Vector3< real_t > diff = *loopFieldIt - *explFieldIt;
+ const real_t length = diff.length();
+
+ if (length > tolerance)
+ {
+ WALBERLA_ABORT("Unequal normals at " << loopFieldIt.cell() << " diff=" << diff << ", |diff|=" << length);
+ }
+ err_mean += length;
+ err_max = std::max(err_max, length);
+ }) // WALBERLA_FOR_ALL_CELLS
+ };
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, uint_c(1));
+
+ // add regular sweep for computing interface normals
+ NormalSweep< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > normalsSweep(
+ normalFieldExplID, fillFieldID, flagFieldID, flagIDs::interfaceFlagID, flagIDs::liquidInterfaceGasFlagIDs,
+ flagIDs::gasFlagID, false, false, false, false);
+ timeloop.add() << Sweep(normalsSweep, "Normal sweep (explicit)");
+
+ // add sweeps
+ timeloop.add() << Sweep(normalsFunc, "Normal loop-based");
+ timeloop.add() << Sweep(evaluateError, "Error computation");
+
+ WcTimingPool timeloopTiming;
+ timeloop.run(timeloopTiming);
+ // timeloopTiming.logResultOnRoot();
+
+ WALBERLA_LOG_RESULT("Max Error: " << err_max);
+ WALBERLA_LOG_RESULT("Mean Error: " << err_mean / real_c(domainSize[0] * domainSize[1] * domainSize[2]));
+
+ return EXIT_SUCCESS;
+}
+} // namespace NormalsEquivalenceTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::NormalsEquivalenceTest::main(argc, argv); }
diff --git a/tests/lbm/free_surface/surface_geometry/NormalsNearSolidTest.cpp b/tests/lbm/free_surface/surface_geometry/NormalsNearSolidTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..8491557fee4e6d3587284ba73436ea4a1893ed29
--- /dev/null
+++ b/tests/lbm/free_surface/surface_geometry/NormalsNearSolidTest.cpp
@@ -0,0 +1,178 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file NormalsNearSolidTest.cpp
+//! \ingroup lbm/free_surface/surface_geometry
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Test interface normal computation as influenced by obstacle cells, i.e., test narrower Parker-Youngs scheme.
+//
+//! The setup is similar to Figure 6.11 in the dissertation of S. Donath, 2011.
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+
+#include "field/AddToStorage.h"
+
+#include "lbm/blockforest/communication/SimpleCommunication.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/field/PdfField.h"
+#include "lbm/free_surface/boundary/FreeSurfaceBoundaryHandling.h"
+#include "lbm/free_surface/surface_geometry/NormalSweep.h"
+#include "lbm/lattice_model/CollisionModel.h"
+#include "lbm/lattice_model/D3Q27.h"
+
+#include "timeloop/SweepTimeloop.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace NormalsNearSolidTest
+{
+// define types
+using LatticeModel_T = lbm::D3Q27< lbm::collision_model::SRT, true >;
+using Stencil_T = LatticeModel_T::Stencil;
+using flag_t = uint32_t;
+
+// define fields
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+using FlagField_T = FlagField< flag_t >;
+
+using Communication_T = blockforest::SimpleCommunication< LatticeModel_T::CommunicationStencil >;
+using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+
+ // define the domain size
+ const Vector3< uint_t > numBlocks(uint_c(1));
+ const Vector3< uint_t > domainSize(uint_c(11), uint_c(3), uint_c(1));
+ const Vector3< uint_t > cellsPerBlock(domainSize[0] / numBlocks[0], domainSize[1] / numBlocks[1],
+ domainSize[2] / numBlocks[2]);
+
+ // create block grid
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ blockforest::createUniformBlockGrid(numBlocks[0], numBlocks[1], numBlocks[2], // blocks
+ cellsPerBlock[0], cellsPerBlock[1], cellsPerBlock[2], // cells
+ real_c(1.0), // dx
+ true, // one block per process
+ false, false, true); // periodicity
+
+ // create lattice model with omega=1
+ LatticeModel_T latticeModel(real_c(1.0));
+
+ // add fields
+ BlockDataID pdfFieldID =
+ lbm::addPdfFieldToStorage< LatticeModel_T >(blockForest, "PDF field", latticeModel, field::fzyx);
+ BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill levels", real_c(1.0), field::fzyx, uint_c(1));
+ BlockDataID normalFieldID = field::addToStorage< VectorField_T >(
+ blockForest, "Normals", Vector3< real_t >(real_c(0)), field::fzyx, uint_c(1));
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+
+ // initialize domain as in Figure 6.11 in dissertation of S. Donath, 2011
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ ScalarField_T* const fillField = blockIt->getData< ScalarField_T >(fillFieldID);
+
+ WALBERLA_FOR_ALL_CELLS(fillFieldIt, fillField, {
+ if (fillFieldIt.y() == cell_idx_c(0)) { *fillFieldIt = real_c(1); }
+ if (fillFieldIt.y() == cell_idx_c(1)) { *fillFieldIt = real_c(fillFieldIt.x()) / real_c(25); }
+ if (fillFieldIt.y() == cell_idx_c(2)) { *fillFieldIt = real_c(0); }
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+ // set solid obstacle cells
+ freeSurfaceBoundaryHandling->setNoSlipAtBorder(stencil::E, cell_idx_c(0));
+ freeSurfaceBoundaryHandling->setNoSlipAtBorder(stencil::W, cell_idx_c(0));
+ freeSurfaceBoundaryHandling->setNoSlipInCell(Cell(cell_idx_c(9), cell_idx_c(2), cell_idx_c(0)));
+
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+
+ // initial communication (to initialize ghost layer in periodic z-direction)
+ Communication_T(blockForest, pdfFieldID, fillFieldID, flagFieldID)();
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, uint_c(1));
+
+ // add sweep for computing interface normals
+ NormalSweep< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > normalsSweep(
+ normalFieldID, fillFieldID, flagFieldID, flagIDs::interfaceFlagID, flagIDs::liquidInterfaceGasFlagIDs,
+ FreeSurfaceBoundaryHandling_T::noSlipFlagID, false, false, true, false);
+ timeloop.add() << Sweep(normalsSweep, "Normals sweep");
+
+ // perform a single time step
+ timeloop.singleStep();
+
+ // check correctness of computed interface normals; reference values have been obtained with a version of the code
+ // that is assumed to be correct; results are also qualitatively verified with Figure 6.11 in dissertation of S.
+ // Donath, 2011
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ const FlagField_T* const flagField = blockIt->getData< const FlagField_T >(flagFieldID);
+ const VectorField_T* const normalField = blockIt->getData< const VectorField_T >(normalFieldID);
+ const flag_t interfaceFlag = flagField->getFlag(flagIDs::interfaceFlagID);
+
+ WALBERLA_FOR_ALL_CELLS(flagFieldIt, flagField, normalFieldIt, normalField, {
+ if (isFlagSet(flagFieldIt, interfaceFlag))
+ {
+ // regular Parker-Youngs normal computation
+ if (flagFieldIt.x() >= cell_idx_c(2) && flagFieldIt.x() <= cell_idx_c(7))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL((*normalFieldIt)[0], real_c(-0.0399680383488715887), real_c(1e-6));
+ WALBERLA_CHECK_FLOAT_EQUAL((*normalFieldIt)[1], real_c(0.999200958721789267), real_c(1e-6));
+ WALBERLA_CHECK_FLOAT_EQUAL((*normalFieldIt)[2], real_c(0), real_c(1e-6));
+ }
+
+ // modified, i.e., narrower Parker-Youngs normal computation near solid boundaries
+ if (flagFieldIt.cell() == Cell(cell_idx_c(1), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL((*normalFieldIt)[0], real_c(-0.0199960011996001309), real_c(1e-6));
+ WALBERLA_CHECK_FLOAT_EQUAL((*normalFieldIt)[1], real_c(0.999800059980007094), real_c(1e-6));
+ WALBERLA_CHECK_FLOAT_EQUAL((*normalFieldIt)[2], real_c(0), real_c(1e-6));
+ }
+ if (flagFieldIt.cell() == Cell(cell_idx_c(8), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL((*normalFieldIt)[0], real_c(-0.129339184067768065), real_c(1e-6));
+ WALBERLA_CHECK_FLOAT_EQUAL((*normalFieldIt)[1], real_c(0.991600411186221775), real_c(1e-6));
+ WALBERLA_CHECK_FLOAT_EQUAL((*normalFieldIt)[2], real_c(-2.99157e-17), real_c(1e-6));
+ }
+ if (flagFieldIt.cell() == Cell(cell_idx_c(9), cell_idx_c(1), cell_idx_c(0)))
+ {
+ WALBERLA_CHECK_FLOAT_EQUAL((*normalFieldIt)[0], real_c(-0.0461047666084008420), real_c(1e-6));
+ WALBERLA_CHECK_FLOAT_EQUAL((*normalFieldIt)[1], real_c(0.998936609848685486), real_c(1e-6));
+ WALBERLA_CHECK_FLOAT_EQUAL((*normalFieldIt)[2], real_c(-8.5311e-17), real_c(1e-6));
+ }
+ }
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ return EXIT_SUCCESS;
+}
+} // namespace NormalsNearSolidTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::NormalsNearSolidTest::main(argc, argv); }
\ No newline at end of file
diff --git a/tests/lbm/free_surface/surface_geometry/NormalsOfSineTest.cpp b/tests/lbm/free_surface/surface_geometry/NormalsOfSineTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..3ca66b6f5a33ab6b71738da0e721ddc542643c06
--- /dev/null
+++ b/tests/lbm/free_surface/surface_geometry/NormalsOfSineTest.cpp
@@ -0,0 +1,470 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file NormalsOfSineTest.cpp
+//! \ingroup lbm/free_surface/surface_geometry
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Initialize sine profile and compare calculated normals to analytical normals.
+//
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+#include "core/logging/Logging.h"
+#include "core/math/Constants.h"
+#include "core/math/DistributedSample.h"
+
+#include "field/AddToStorage.h"
+
+#include "lbm/blockforest/communication/SimpleCommunication.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/field/PdfField.h"
+#include "lbm/free_surface/boundary/FreeSurfaceBoundaryHandling.h"
+#include "lbm/free_surface/surface_geometry/NormalSweep.h"
+#include "lbm/free_surface/surface_geometry/SmoothingSweep.h"
+#include "lbm/lattice_model/CollisionModel.h"
+#include "lbm/lattice_model/D2Q9.h"
+#include "lbm/lattice_model/D3Q19.h"
+#include "lbm/lattice_model/D3Q27.h"
+
+#include "stencil/D2Q9.h"
+#include "stencil/D3Q19.h"
+#include "stencil/D3Q27.h"
+
+#include "timeloop/SweepTimeloop.h"
+
+#include <cmath>
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace NormalsOfSineTest
+{
+// define types
+using flag_t = uint32_t;
+
+// define fields
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+using FlagField_T = FlagField< flag_t >;
+
+// function describing the global sine profile
+inline real_t function(real_t x, real_t amplitude, real_t offset, uint_t domainWidth)
+{
+ return amplitude * std::sin(x / real_c(domainWidth) * real_c(2) * math::pi) + offset;
+}
+
+// derivative of the function that is describing the sine profile
+inline real_t derivative(real_t x, real_t amplitude, uint_t domainWidth)
+{
+ const real_t domainWidthInv = real_c(1) / real_c(domainWidth);
+ return amplitude * std::cos(x * domainWidthInv * real_c(2) * math::pi) * real_c(2) * math::pi * domainWidthInv;
+}
+
+// compute and evaluate the absolute error of the angle of the interface normal in each interface cell;
+// reference: derivative of sine function, i.e., analytically computed normal
+template< typename Stencil_T >
+class EvaluateNormalError
+{
+ public:
+ EvaluateNormalError(const std::weak_ptr< const StructuredBlockForest >& blockForest,
+ const ConstBlockDataID& normalFieldID, const ConstBlockDataID& flagFieldID,
+ const field::FlagUID& interfaceFlagID, const Vector3< uint_t >& domainSize, real_t amplitude,
+ bool computeNormalsInInterfaceNeighbors, bool smoothFillLevel)
+ : blockForest_(blockForest), normalFieldID_(normalFieldID), flagFieldID_(flagFieldID),
+ interfaceFlagID_(interfaceFlagID), domainSize_(domainSize), amplitude_(amplitude),
+ computeNormalsInInterfaceNeighbors_(computeNormalsInInterfaceNeighbors), smoothFillLevel_(smoothFillLevel)
+ {}
+
+ void operator()(IBlock* const block)
+ {
+ const auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ // compute analytical normals and compare their directions with the computed normals
+ const FlagField_T* const flagField = block->getData< const FlagField_T >(flagFieldID_);
+ const VectorField_T* const normalField = block->getData< const VectorField_T >(normalFieldID_);
+
+ const flag_t interfaceFlag = flagField->getFlag(interfaceFlagID_);
+
+ math::DistributedSample errorSample;
+
+ // avoid OpenMP parallelization as DistributedSample can not be reduced by OpenMP
+ WALBERLA_FOR_ALL_CELLS_OMP(flagFieldIt, flagField, normalFieldIt, normalField, omp critical, {
+ if (isFlagSet(flagFieldIt, interfaceFlag) ||
+ (computeNormalsInInterfaceNeighbors_ && isFlagInNeighborhood< Stencil_T >(flagFieldIt, interfaceFlag)))
+ {
+ Cell globalCell = flagFieldIt.cell();
+ blockForest->transformBlockLocalToGlobalCell(globalCell, *block, flagFieldIt.cell());
+
+ // global x-location of this cell's center
+ const real_t globalXCenter = real_c(globalCell[0]) + real_c(0.5);
+
+ // get normal vector (slope of the negative inverse derivative gives direction of the normal)
+ Vector3< real_t > analyticalNormal = Vector3< real_t >(
+ real_c(1), -real_c(1) / derivative(globalXCenter, amplitude_, domainSize_[0]), real_c(0));
+ analyticalNormal = analyticalNormal.getNormalized();
+
+ // mirror vectors that are pointing upwards, i.e., from gas to liquid; in this FSLBM implementation, the
+ // normal vector is defined to point from liquid to gas
+ if (analyticalNormal[1] < real_c(0)) { analyticalNormal *= -real_c(1); }
+
+ // calculate the error in the angle of the interface normal
+ // the domain of arccosine is [-1,1]; due to numerical inaccuracies, the dot product
+ // "*normalFieldIt*analyticalNormal" might be slightly out of this range; these cases are ignored here
+ const real_t dotProduct = *normalFieldIt * analyticalNormal;
+ if (dotProduct >= real_c(-1) && dotProduct <= real_c(1))
+ {
+ const real_t angleDiff = std::acos(dotProduct);
+ errorSample.insert(angleDiff);
+ }
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_OMP
+
+ errorSample.mpiAllGather();
+
+ const real_t maxError = errorSample.max();
+ const real_t meanError = errorSample.mean();
+
+ WALBERLA_LOG_RESULT("Mean absolute error in angle of normal = " << meanError);
+ WALBERLA_LOG_RESULT("Maximum absolute error in angle of normal = " << maxError);
+ WALBERLA_LOG_RESULT("Minimum absolute error in angle of normal = " << errorSample.min());
+
+ // the following reference errors have been obtained with a version of the code that is believed to be correct
+ if constexpr (std::is_same_v< Stencil_T, stencil::D2Q9 > || std::is_same_v< Stencil_T, stencil::D3Q27 >)
+ {
+ if (computeNormalsInInterfaceNeighbors_ && smoothFillLevel_)
+ {
+ WALBERLA_CHECK_LESS(meanError, real_c(0.036));
+ WALBERLA_CHECK_LESS(maxError, real_c(0.135));
+ }
+
+ if (!computeNormalsInInterfaceNeighbors_ && smoothFillLevel_)
+ {
+ WALBERLA_CHECK_LESS(meanError, real_c(0.019));
+ WALBERLA_CHECK_LESS(maxError, real_c(0.044));
+ }
+
+ if (!computeNormalsInInterfaceNeighbors_ && !smoothFillLevel_)
+ {
+ WALBERLA_CHECK_LESS(meanError, real_c(0.027));
+ WALBERLA_CHECK_LESS(maxError, real_c(0.07));
+ }
+
+ if (computeNormalsInInterfaceNeighbors_ && !smoothFillLevel_)
+ {
+ WALBERLA_CHECK_LESS(meanError, real_c(0.158));
+ WALBERLA_CHECK_LESS(maxError, real_c(1.58));
+ }
+ }
+
+ // normal computation is less accurate if corner directions are not included (as opposed to D2Q9/D3Q27)
+ if constexpr (std::is_same_v< Stencil_T, stencil::D3Q19 >)
+ {
+ if (computeNormalsInInterfaceNeighbors_ && smoothFillLevel_)
+ {
+ WALBERLA_CHECK_LESS(meanError, real_c(0.036));
+ WALBERLA_CHECK_LESS(maxError, real_c(0.135));
+ }
+
+ if (!computeNormalsInInterfaceNeighbors_ && smoothFillLevel_)
+ {
+ WALBERLA_CHECK_LESS(meanError, real_c(0.023));
+ WALBERLA_CHECK_LESS(maxError, real_c(0.046));
+ }
+
+ if (!computeNormalsInInterfaceNeighbors_ && !smoothFillLevel_)
+ {
+ WALBERLA_CHECK_LESS(meanError, real_c(0.048));
+ WALBERLA_CHECK_LESS(maxError, real_c(0.101));
+ }
+
+ if (computeNormalsInInterfaceNeighbors_ && !smoothFillLevel_)
+ {
+ WALBERLA_CHECK_LESS(meanError, real_c(0.158));
+ WALBERLA_CHECK_LESS(maxError, real_c(1.58));
+ }
+ }
+ }
+
+ private:
+ std::weak_ptr< const StructuredBlockForest > blockForest_;
+ ConstBlockDataID normalFieldID_;
+ ConstBlockDataID flagFieldID_;
+ field::FlagUID interfaceFlagID_;
+
+ Vector3< uint_t > domainSize_;
+ real_t amplitude_;
+
+ bool computeNormalsInInterfaceNeighbors_;
+ bool smoothFillLevel_;
+}; // class EvaluateNormalError
+
+template< typename LatticeModel_T >
+void test(uint_t domainWidth, real_t amplitude, real_t offset, uint_t fillLevelInitSamples,
+ bool computeNormalsInInterfaceNeighbors, bool smoothFillLevel)
+{
+ // define types
+ using Stencil_T = typename LatticeModel_T::Stencil;
+ using Communication_T = blockforest::SimpleCommunication< typename LatticeModel_T::CommunicationStencil >;
+ using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+ // define the domain size
+ const Vector3< uint_t > numBlocks(uint_c(1));
+ Vector3< uint_t > domainSize(domainWidth);
+ domainSize[2] = uint_c(1);
+ const Vector3< uint_t > cellsPerBlock(domainSize[0] / numBlocks[0], domainSize[1] / numBlocks[1],
+ domainSize[2] / numBlocks[2]);
+
+ // create block grid
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ blockforest::createUniformBlockGrid(numBlocks[0], numBlocks[1], numBlocks[2], // blocks
+ cellsPerBlock[0], cellsPerBlock[1], cellsPerBlock[2], // cells
+ real_c(1.0), // dx
+ true, // one block per process
+ true, false, true); // periodicity
+
+ // create (dummy) lattice model with omega=1
+ LatticeModel_T latticeModel(real_c(1.0));
+
+ // add fields
+ BlockDataID pdfFieldID =
+ lbm::addPdfFieldToStorage< LatticeModel_T >(blockForest, "PDF field", latticeModel, field::fzyx);
+ BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill levels", real_c(1.0), field::fzyx, uint_c(1));
+ BlockDataID normalFieldID = field::addToStorage< VectorField_T >(
+ blockForest, "Normals", Vector3< real_t >(real_c(0)), field::fzyx, uint_c(1));
+ BlockDataID smoothFillFieldID;
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+
+ // initialize sine profile such that there is exactly one period; every length is normalized with domainSize[0]
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ uint_t numTotalPoints = fillLevelInitSamples * fillLevelInitSamples;
+ const real_t stepsize = real_c(1) / real_c(fillLevelInitSamples);
+
+ ScalarField_T* const fillField = blockIt->getData< ScalarField_T >(fillFieldID);
+
+ WALBERLA_FOR_ALL_CELLS(fillFieldIt, fillField, {
+ // cell in block-local coordinates
+ const Cell localCell = fillFieldIt.cell();
+
+ // get cell in global coordinates
+ Cell globalCell = fillFieldIt.cell();
+ blockForest->transformBlockLocalToGlobalCell(globalCell, *blockIt, localCell);
+
+ // Monte-Carlo like estimation of the fill level:
+ // create uniformly-distributed sample points in each cell and count the number of points below the sine
+ // profile; this fraction of points is used as the fill level to initialize the profile
+ uint_t numPointsBelow = uint_c(0);
+
+ for (uint_t xSample = uint_c(0); xSample < fillLevelInitSamples; ++xSample)
+ {
+ // value of the sine-function
+ const real_t functionValue =
+ function(real_c(globalCell[0]) + real_c(xSample) * stepsize, amplitude, offset, domainSize[0]);
+
+ for (uint_t ySample = uint_c(0); ySample < fillLevelInitSamples; ++ySample)
+ {
+ const real_t yPoint = real_c(globalCell[1]) + real_c(ySample) * stepsize;
+ if (yPoint < functionValue) { ++numPointsBelow; }
+ }
+ }
+
+ // fill level is fraction of points below sine profile
+ fillField->get(localCell) = real_c(numPointsBelow) / real_c(numTotalPoints);
+ }) // WALBERLA_FOR_ALL_CELLS
+ }
+
+ // communicate fill level field to have meaningful values in ghost layer cells in periodic directions
+ Communication_T(blockForest, fillFieldID)();
+
+ // initialize fill level field
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+
+ // communicate initialized flag field
+ Communication_T(blockForest, flagFieldID)();
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, uint_c(50));
+
+ BlockDataID* relevantFillFieldID = &fillFieldID;
+
+ if (smoothFillLevel)
+ {
+ smoothFillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Smooth fill levels", real_c(0.0), field::fzyx, uint_c(1));
+
+ // add sweep for smoothing the fill level field
+ SmoothingSweep< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > smoothingSweep(
+ smoothFillFieldID, fillFieldID, flagFieldID, flagIDs::liquidInterfaceGasFlagIDs,
+ freeSurfaceBoundaryHandling->getFlagInfo().getObstacleIDSet(), false);
+ timeloop.add() << Sweep(smoothingSweep, "Smoothing sweep")
+ << AfterFunction(Communication_T(blockForest, smoothFillFieldID),
+ "Communication after smoothing sweep");
+ relevantFillFieldID = &smoothFillFieldID;
+ }
+
+ // add sweep for computing interface normals
+ NormalSweep< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > normalsSweep(
+ normalFieldID, *relevantFillFieldID, flagFieldID, flagIDs::interfaceFlagID, flagIDs::liquidInterfaceGasFlagIDs,
+ freeSurfaceBoundaryHandling->getFlagInfo().getObstacleIDSet(), computeNormalsInInterfaceNeighbors, false, false,
+ false);
+ timeloop.add() << Sweep(normalsSweep, "Normals sweep")
+ << AfterFunction(Communication_T(blockForest, normalFieldID), "Communication after normal sweep");
+
+ // add sweep for evaluating the error of the interface normals (by comparing with analytical normal)
+ EvaluateNormalError< Stencil_T > errorEvaluationSweep(blockForest, normalFieldID, flagFieldID,
+ flagIDs::interfaceFlagID, domainSize, amplitude,
+ computeNormalsInInterfaceNeighbors, smoothFillLevel);
+ timeloop.add() << Sweep(errorEvaluationSweep, "Error evaluation sweep");
+
+ // perform a single time step
+ timeloop.singleStep();
+
+ MPIManager::instance()->resetMPI();
+}
+
+template< typename LatticeModel_T >
+void runAllTests()
+{
+ // used for initializing the fill level in a Monte-Carlo-like fashion; each cell is sampled by the specified value in
+ // x- and y-direction
+ const uint_t fillLevelInitSamples = uint_c(100);
+
+ // test with various domain sizes, i.e., resolutions
+ for (uint_t i = uint_c(50); i <= uint_c(200); i += uint_c(50))
+ {
+ const real_t amplitude = real_c(0.1) * real_c(i); // amplitude of the sine profile
+ const real_t offset = real_c(0.5) * real_c(i); // offset the sine profile in y-direction
+
+ WALBERLA_LOG_RESULT("Domain size " << i << " cells; normals computed only in interface cells;");
+ test< LatticeModel_T >(i, amplitude, offset, fillLevelInitSamples, false, false);
+
+ WALBERLA_LOG_RESULT(
+ "Domain size " << i << " cells; normals computed only in interface cells; fill level field smoothed;");
+ test< LatticeModel_T >(i, amplitude, offset, fillLevelInitSamples, false, true);
+
+ WALBERLA_LOG_RESULT("Domain size " << i
+ << " cells; normals computed in D2Q9/D3Q27 neighborhood of interface cells;");
+ test< LatticeModel_T >(i, amplitude, offset, fillLevelInitSamples, true, false);
+
+ WALBERLA_LOG_RESULT(
+ "Domain size "
+ << i << " cells; normals computed in D2Q9/D3Q27 neighborhood of interface cells; fill level field smoothed;");
+ test< LatticeModel_T >(i, amplitude, offset, fillLevelInitSamples, true, true);
+ }
+
+ // default values
+ const uint_t domainWidth = uint_c(100); // size of the domain in x- and y-direction
+ const real_t amplitude = real_c(0.1) * real_c(domainWidth); // amplitude of the sine profile
+ const real_t offset = real_c(0.5) * real_c(domainWidth); // offset the sine profile in y-direction
+
+ // test with various amplitudes
+ for (real_t i = real_c(0.01); i < real_c(0.3); i += real_c(0.03))
+ {
+ WALBERLA_LOG_RESULT("Amplitude " << i << " cells; normals computed only in interface cells;");
+ test< LatticeModel_T >(domainWidth, i * real_c(domainWidth), offset, fillLevelInitSamples, false, false);
+
+ WALBERLA_LOG_RESULT(
+ "Amplitude " << i << " cells; normals computed only in interface cells; fill level field smoothed;");
+ test< LatticeModel_T >(domainWidth, i * real_c(domainWidth), offset, fillLevelInitSamples, false, true);
+
+ WALBERLA_LOG_RESULT("Amplitude " << i
+ << " cells; normals computed in D2Q9/D3Q27 neighborhood of interface cells;");
+ test< LatticeModel_T >(domainWidth, i * real_c(domainWidth), offset, fillLevelInitSamples, true, false);
+
+ WALBERLA_LOG_RESULT(
+ "Amplitude "
+ << i << " cells; normals computed in D2Q9/D3Q27 neighborhood of interface cells; fill level field smoothed;");
+ test< LatticeModel_T >(domainWidth, i * real_c(domainWidth), offset, fillLevelInitSamples, true, true);
+ }
+
+ // test with various offsets, i.e., position of the sine-profile's zero-line
+ for (real_t i = real_c(0.4); i < real_c(0.6); i += real_c(0.03))
+ {
+ WALBERLA_LOG_RESULT("Offset " << i << " cells; normals computed only in interface cells;");
+ test< LatticeModel_T >(domainWidth, amplitude, i * real_c(domainWidth), fillLevelInitSamples, false, false);
+
+ WALBERLA_LOG_RESULT("Offset " << i
+ << " cells; normals computed only in interface cells; fill level field smoothed;");
+ test< LatticeModel_T >(domainWidth, amplitude, i * real_c(domainWidth), fillLevelInitSamples, false, true);
+
+ WALBERLA_LOG_RESULT("Offset " << i << " cells; normals computed in D2Q9/D3Q27 neighborhood of interface cells;");
+ test< LatticeModel_T >(domainWidth, amplitude, i * real_c(domainWidth), fillLevelInitSamples, true, false);
+
+ WALBERLA_LOG_RESULT(
+ "Offset "
+ << i << " cells; normals computed in D2Q9/D3Q27 neighborhood of interface cells; fill level field smoothed;");
+ test< LatticeModel_T >(domainWidth, amplitude, i * real_c(domainWidth), fillLevelInitSamples, true, true);
+ }
+
+ // test with different fill level initialization samples (more samples => initialization of fill levels is
+ // closer to the real sine-profile)
+ for (uint_t i = uint_c(50); i <= uint_c(200); i += uint_c(50))
+ {
+ WALBERLA_LOG_RESULT("Fill level initialization sample " << i
+ << " cells; normals computed only in interface cells;");
+ test< LatticeModel_T >(domainWidth, amplitude, offset, i, false, false);
+
+ WALBERLA_LOG_RESULT("Fill level initialization sample "
+ << i << " cells; normals computed only in interface cells; fill level field smoothed;");
+ test< LatticeModel_T >(domainWidth, amplitude, offset, i, false, true);
+
+ WALBERLA_LOG_RESULT("Fill level initialization sample "
+ << i << " cells; normals computed in D2Q9/D3Q27 neighborhood of interface cells;");
+ test< LatticeModel_T >(domainWidth, amplitude, offset, i, true, false);
+
+ WALBERLA_LOG_RESULT(
+ "Fill level initialization sample "
+ << i << " cells; normals computed in D2Q9/D3Q27 neighborhood of interface cells; fill level field smoothed;");
+ test< LatticeModel_T >(domainWidth, amplitude, offset, i, true, true);
+ }
+}
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+
+ WALBERLA_LOG_RESULT("##################################");
+ WALBERLA_LOG_RESULT("### Testing with D2Q9 stencil. ###");
+ WALBERLA_LOG_RESULT("##################################");
+ runAllTests< lbm::D2Q9< lbm::collision_model::SRT > >();
+
+ WALBERLA_LOG_RESULT("###################################");
+ WALBERLA_LOG_RESULT("### Testing with D3Q19 stencil. ###");
+ WALBERLA_LOG_RESULT("###################################");
+ runAllTests< lbm::D3Q19< lbm::collision_model::SRT > >();
+
+ WALBERLA_LOG_RESULT("###################################");
+ WALBERLA_LOG_RESULT("### Testing with D3Q27 stencil. ###");
+ WALBERLA_LOG_RESULT("###################################");
+ runAllTests< lbm::D3Q27< lbm::collision_model::SRT > >();
+
+ return EXIT_SUCCESS;
+}
+} // namespace NormalsOfSineTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::NormalsOfSineTest::main(argc, argv); }
\ No newline at end of file
diff --git a/tests/lbm/free_surface/surface_geometry/NormalsOfSphereTest.cpp b/tests/lbm/free_surface/surface_geometry/NormalsOfSphereTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..ca3c6b4f1f802ac224d1ae94b64bcbd7d52a2c56
--- /dev/null
+++ b/tests/lbm/free_surface/surface_geometry/NormalsOfSphereTest.cpp
@@ -0,0 +1,363 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file NormalsOfSphereTest.cpp
+//! \ingroup lbm/free_surface/surface_geometry
+//! \author Martin Bauer
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Initialize spherical bubble and compare calculated normals to analytical (radial) normals.
+//
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+#include "core/logging/Logging.h"
+#include "core/math/DistributedSample.h"
+
+#include "field/AddToStorage.h"
+
+#include "geometry/bodies/Sphere.h"
+
+#include "lbm/blockforest/communication/SimpleCommunication.h"
+#include "lbm/field/AddToStorage.h"
+#include "lbm/field/PdfField.h"
+#include "lbm/free_surface/boundary/FreeSurfaceBoundaryHandling.h"
+#include "lbm/free_surface/surface_geometry/NormalSweep.h"
+#include "lbm/free_surface/surface_geometry/SmoothingSweep.h"
+#include "lbm/lattice_model/CollisionModel.h"
+#include "lbm/lattice_model/D3Q19.h"
+#include "lbm/lattice_model/D3Q27.h"
+
+#include "timeloop/SweepTimeloop.h"
+
+#include <cmath>
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace NormalsOfSphereTest
+{
+// define types
+using flag_t = uint32_t;
+
+// define fields
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+using FlagField_T = FlagField< flag_t >;
+
+// compute and evaluate the absolute error of the angle of the interface normal in each interface cell;
+// reference: vector that points from the gas bubble's, i.e., sphere's center to the current interface cell's center
+template< typename Stencil_T >
+class EvaluateNormalError
+{
+ public:
+ EvaluateNormalError(const std::weak_ptr< const StructuredBlockForest >& blockForest, const geometry::Sphere& sphere,
+ const ConstBlockDataID& normalFieldID, const ConstBlockDataID& flagFieldID,
+ const field::FlagUID& interfaceFlagID, bool computeNormalsInInterfaceNeighbors,
+ bool smoothFillLevel)
+ : blockForest_(blockForest), sphere_(sphere), normalFieldID_(normalFieldID), flagFieldID_(flagFieldID),
+ interfaceFlagID_(interfaceFlagID), computeNormalsInInterfaceNeighbors_(computeNormalsInInterfaceNeighbors),
+ smoothFillLevel_(smoothFillLevel)
+ {}
+
+ void operator()(IBlock* const block)
+ {
+ const auto blockForest = blockForest_.lock();
+ WALBERLA_CHECK_NOT_NULLPTR(blockForest);
+
+ // get fields
+ const FlagField_T* const flagField = block->getData< const FlagField_T >(flagFieldID_);
+ const VectorField_T* const normalField = block->getData< const VectorField_T >(normalFieldID_);
+
+ const flag_t interfaceFlag = flagField->getFlag(interfaceFlagID_);
+
+ math::DistributedSample errorSample;
+
+ WALBERLA_FOR_ALL_CELLS_OMP(flagFieldIt, flagField, normalFieldIt, normalField, omp critical, {
+ // evaluate normal only in interface cell (and possibly in an interface cell's neighborhood)
+ if (isFlagSet(flagFieldIt, interfaceFlag) ||
+ (computeNormalsInInterfaceNeighbors_ && isFlagInNeighborhood< Stencil_T >(flagFieldIt, interfaceFlag)))
+ {
+ // get a vector pointing from sphere's center to current cell's center
+ Vector3< real_t > r;
+
+ // get the global coordinate of the current cell's center
+ blockForest->getBlockLocalCellCenter(*block, flagFieldIt.cell(), r);
+ r -= sphere_.midpoint();
+
+ // invert normal direction: in this FSLBM implementation, the normal vector is defined to point from liquid
+ // to gas
+ r *= real_c(-1);
+ normalize(r);
+
+ // calculate the error in the angle of the interface normal
+ // the domain of arccosine is [-1,1]; due to numerical inaccuracies, the dot product "*normalFieldIt*r"
+ // might be slightly out of this range; these cases are ignored here
+ const real_t dotProduct = *normalFieldIt * r;
+ if (dotProduct >= real_c(-1) && dotProduct <= real_c(1))
+ {
+ const real_t angleDiff = std::acos(dotProduct);
+ errorSample.insert(angleDiff);
+ }
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_OMP
+
+ errorSample.mpiAllGather();
+
+ const real_t maxError = errorSample.max();
+ const real_t meanError = errorSample.mean();
+
+ WALBERLA_LOG_RESULT("Mean absolute error in angle of normal = " << meanError);
+ WALBERLA_LOG_RESULT("Maximum absolute error in angle of normal = " << maxError);
+ WALBERLA_LOG_RESULT("Minimum absolute error in angle of normal = " << errorSample.min());
+
+ // the following reference errors have been obtained with a version of the code that is believed to be correct
+ if (computeNormalsInInterfaceNeighbors_ && smoothFillLevel_)
+ {
+ if constexpr (std::is_same_v< Stencil_T, stencil::D3Q27 >)
+ {
+ WALBERLA_CHECK_LESS(meanError, real_c(0.036));
+ WALBERLA_CHECK_LESS(maxError, real_c(0.2));
+ }
+ else
+ {
+ if constexpr (std::is_same_v< Stencil_T, stencil::D3Q19 >)
+ {
+ WALBERLA_CHECK_LESS(meanError, real_c(0.036));
+ WALBERLA_CHECK_LESS(maxError, real_c(0.19));
+ }
+ }
+ }
+
+ if (!computeNormalsInInterfaceNeighbors_ && smoothFillLevel_)
+ {
+ if constexpr (std::is_same_v< Stencil_T, stencil::D3Q27 >)
+ {
+ WALBERLA_CHECK_LESS(meanError, real_c(0.016));
+ WALBERLA_CHECK_LESS(maxError, real_c(0.045));
+ }
+ else
+ {
+ if constexpr (std::is_same_v< Stencil_T, stencil::D3Q19 >)
+ {
+ WALBERLA_CHECK_LESS(meanError, real_c(0.0147));
+ WALBERLA_CHECK_LESS(maxError, real_c(0.0457));
+ }
+ }
+ }
+
+ if (!computeNormalsInInterfaceNeighbors_ && !smoothFillLevel_)
+ {
+ if constexpr (std::is_same_v< Stencil_T, stencil::D3Q27 >)
+ {
+ WALBERLA_CHECK_LESS(meanError, real_c(0.021));
+ WALBERLA_CHECK_LESS(maxError, real_c(0.08));
+ }
+ else
+ {
+ if constexpr (std::is_same_v< Stencil_T, stencil::D3Q19 >)
+ {
+ WALBERLA_CHECK_LESS(meanError, real_c(0.037));
+ WALBERLA_CHECK_LESS(maxError, real_c(0.096));
+ }
+ }
+ }
+
+ if (computeNormalsInInterfaceNeighbors_ && !smoothFillLevel_)
+ {
+ if constexpr (std::is_same_v< Stencil_T, stencil::D3Q27 >)
+ {
+ WALBERLA_CHECK_LESS(meanError, real_c(0.139));
+ WALBERLA_CHECK_LESS(maxError, real_c(1.58));
+ }
+ else
+ {
+ if constexpr (std::is_same_v< Stencil_T, stencil::D3Q19 >)
+ {
+ WALBERLA_CHECK_LESS(meanError, real_c(0.121));
+ WALBERLA_CHECK_LESS(maxError, real_c(1.58));
+ }
+ }
+ }
+ }
+
+ private:
+ std::weak_ptr< const StructuredBlockForest > blockForest_;
+ geometry::Sphere sphere_;
+
+ ConstBlockDataID normalFieldID_;
+ ConstBlockDataID flagFieldID_;
+ field::FlagUID interfaceFlagID_;
+
+ bool computeNormalsInInterfaceNeighbors_;
+ bool smoothFillLevel_;
+}; // class EvaluateNormalError
+
+template< typename LatticeModel_T >
+void test(uint_t numCells, Vector3< real_t > offset, bool computeNormalsInInterfaceNeighbors, bool smoothFillLevel)
+{
+ // define types
+ using Stencil_T = typename LatticeModel_T::Stencil;
+ using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+ using Communication_T = blockforest::SimpleCommunication< typename LatticeModel_T::CommunicationStencil >;
+
+ // define the domain size
+ const Vector3< uint_t > numBlocks(uint_c(1));
+ const Vector3< uint_t > domainSize(numCells + uint_c(6));
+ const Vector3< uint_t > cellsPerBlock(domainSize[0] / numBlocks[0], domainSize[1] / numBlocks[1],
+ domainSize[2] / numBlocks[2]);
+
+ // create block grid
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ blockforest::createUniformBlockGrid(numBlocks[0], numBlocks[1], numBlocks[2], // blocks
+ cellsPerBlock[0], cellsPerBlock[1], cellsPerBlock[2], // cells
+ real_c(1.0), // dx
+ true, // one block per process
+ false, false, false); // periodicity
+
+ // create lattice model with omega=1
+ LatticeModel_T latticeModel(real_c(1.0));
+
+ // add fields
+ BlockDataID pdfFieldID =
+ lbm::addPdfFieldToStorage< LatticeModel_T >(blockForest, "PDF field", latticeModel, field::fzyx);
+ BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill levels", real_c(1.0), field::fzyx, uint_c(1));
+ BlockDataID normalFieldID = field::addToStorage< VectorField_T >(
+ blockForest, "Normals", Vector3< real_t >(real_c(0)), field::fzyx, uint_c(1));
+ BlockDataID smoothFillFieldID;
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+
+ // add gas sphere, i.e., bubble
+ Vector3< real_t > midpoint(real_c(domainSize[0]) * real_c(0.5), real_c(domainSize[1]) * real_c(0.5),
+ real_c(domainSize[2]) * real_c(0.5));
+ geometry::Sphere sphere(midpoint + offset, real_c(numCells) * real_c(0.5));
+ freeSurfaceBoundaryHandling->addFreeSurfaceObject(sphere);
+ freeSurfaceBoundaryHandling->initFlagsFromFillLevel();
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, uint_c(1));
+
+ BlockDataID* relevantFillFieldID = &fillFieldID;
+
+ if (smoothFillLevel)
+ {
+ smoothFillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Smooth fill levels", real_c(1.0), field::fzyx, uint_c(1));
+
+ // add sweep for smoothing the fill level field
+ SmoothingSweep< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > smoothingSweep(
+ smoothFillFieldID, fillFieldID, flagFieldID, flagIDs::liquidInterfaceGasFlagIDs,
+ freeSurfaceBoundaryHandling->getFlagInfo().getObstacleIDSet(), false);
+ timeloop.add() << Sweep(smoothingSweep, "Smoothing sweep")
+ << AfterFunction(Communication_T(blockForest, smoothFillFieldID),
+ "Communication after smoothing sweep");
+
+ relevantFillFieldID = &smoothFillFieldID;
+ }
+
+ // add sweep for computing interface normals
+ NormalSweep< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > normalsSweep(
+ normalFieldID, *relevantFillFieldID, flagFieldID, flagIDs::interfaceFlagID, flagIDs::liquidInterfaceGasFlagIDs,
+ freeSurfaceBoundaryHandling->getFlagInfo().getObstacleIDSet(), computeNormalsInInterfaceNeighbors, false, false,
+ false);
+ timeloop.add() << Sweep(normalsSweep, "Normals sweep")
+ << AfterFunction(Communication_T(blockForest, normalFieldID), "Communication after normal sweep");
+
+ // add sweep for evaluating the error of the interface normals (by comparing with analytical normal)
+ EvaluateNormalError< Stencil_T > errorEvaluationSweep(blockForest, sphere, normalFieldID, flagFieldID,
+ flagIDs::interfaceFlagID, computeNormalsInInterfaceNeighbors,
+ smoothFillLevel);
+ timeloop.add() << Sweep(errorEvaluationSweep, "Error evaluation sweep");
+
+ // perform a single time step
+ timeloop.singleStep();
+
+ MPIManager::instance()->resetMPI();
+}
+
+template< typename LatticeModel_T >
+void runAllTests()
+{
+ // test with various bubble diameters
+ for (uint_t i = uint_c(10); i <= uint_c(30); i += uint_c(10))
+ {
+ WALBERLA_LOG_RESULT("Bubble diameter " << i << " cells; normals computed only in interface cells;");
+ test< LatticeModel_T >(i, Vector3< real_t >(real_c(0.5), real_c(0), real_c(0)), false, false);
+
+ WALBERLA_LOG_RESULT("Bubble diameter "
+ << i << " cells; normals computed only in interface cells; fill level field smoothed;");
+ test< LatticeModel_T >(i, Vector3< real_t >(real_c(0.5), real_c(0), real_c(0)), false, true);
+
+ WALBERLA_LOG_RESULT("Bubble diameter " << i
+ << " cells; normals computed in D3Q27 neighborhood of interface cells;");
+ test< LatticeModel_T >(i, Vector3< real_t >(real_c(0.5), real_c(0), real_c(0)), true, false);
+
+ WALBERLA_LOG_RESULT(
+ "Bubble diameter "
+ << i << " cells; normals computed in D3Q27 neighborhood of interface cells; fill level field smoothed;");
+ test< LatticeModel_T >(i, Vector3< real_t >(real_c(0.5), real_c(0), real_c(0)), true, true);
+ }
+
+ // test with various offsets of sphere's center
+ for (real_t off = real_c(0.0); off < real_c(1.0); off += real_c(0.2))
+ {
+ WALBERLA_LOG_RESULT("Bubble offset " << off << " cells; normals computed only in interface cells;");
+ test< LatticeModel_T >(uint_c(10), Vector3< real_t >(off, real_c(0), real_c(0)), false, false);
+
+ WALBERLA_LOG_RESULT("Bubble offset "
+ << off << " cells; normals computed only in interface cells; fill level field smoothed;");
+ test< LatticeModel_T >(uint_c(10), Vector3< real_t >(off, real_c(0), real_c(0)), false, true);
+
+ WALBERLA_LOG_RESULT("Bubble offset " << off
+ << " cells; normals computed in D3Q27 neighborhood of interface cells;");
+ test< LatticeModel_T >(uint_c(10), Vector3< real_t >(off, real_c(0), real_c(0)), true, false);
+
+ WALBERLA_LOG_RESULT(
+ "Bubble offset "
+ << off << " cells; normals computed in D3Q27 neighborhood of interface cells; fill level field smoothed;");
+ test< LatticeModel_T >(uint_c(10), Vector3< real_t >(off, real_c(0), real_c(0)), true, true);
+ }
+}
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+
+ WALBERLA_LOG_RESULT("###################################");
+ WALBERLA_LOG_RESULT("### Testing with D3Q19 stencil. ###");
+ WALBERLA_LOG_RESULT("###################################");
+ runAllTests< lbm::D3Q19< lbm::collision_model::SRT > >();
+
+ WALBERLA_LOG_RESULT("###################################");
+ WALBERLA_LOG_RESULT("### Testing with D3Q27 stencil. ###");
+ WALBERLA_LOG_RESULT("###################################");
+ runAllTests< lbm::D3Q27< lbm::collision_model::SRT > >();
+
+ return EXIT_SUCCESS;
+}
+} // namespace NormalsOfSphereTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::NormalsOfSphereTest::main(argc, argv); }
\ No newline at end of file
diff --git a/tests/lbm/free_surface/surface_geometry/ObstacleFillLevelTest.cpp b/tests/lbm/free_surface/surface_geometry/ObstacleFillLevelTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..6ccbff11bc22d74015706c8406113da9206c4e73
--- /dev/null
+++ b/tests/lbm/free_surface/surface_geometry/ObstacleFillLevelTest.cpp
@@ -0,0 +1,283 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file ObstacleFillLevelTest.cpp
+//! \ingroup lbm/free_surface/surface_geometry
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Test the ObstacleFillLevelSweep with an obstacle cell that is surrounded by different other cells.
+//!
+//! 3x3x1 domain, with obstacle cell at (1,1,0) and given obstacle normal.
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+
+#include "lbm/field/AddToStorage.h"
+#include "lbm/free_surface/boundary/FreeSurfaceBoundaryHandling.h"
+#include "lbm/free_surface/surface_geometry/ObstacleFillLevelSweep.h"
+#include "lbm/lattice_model/D3Q19.h"
+
+#include "timeloop/SweepTimeloop.h"
+
+#include <unordered_map>
+#include <unordered_set>
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace ObstacleFillLevelTest
+{
+using LatticeModel_T = lbm::D3Q19< lbm::collision_model::SRT >;
+using PdfField_T = lbm::PdfField< LatticeModel_T >;
+using Stencil_T = LatticeModel_T::Stencil;
+
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+
+using flag_t = uint32_t;
+using FlagField_T = FlagField< flag_t >;
+using FreeSurfaceBoundaryHandling_T = FreeSurfaceBoundaryHandling< LatticeModel_T, FlagField_T, ScalarField_T >;
+
+real_t computeObstacleFillLevel(const std::unordered_map< Cell, real_t >& interfaceCells,
+ const std::unordered_set< Cell >& liquidCells,
+ const std::unordered_set< Cell >& gasCells,
+ const std::unordered_set< Cell >& solidCells,
+ const Vector3< real_t >& centerObstacleNormal)
+{
+ // define the domain size
+ const Vector3< uint_t > numBlocks(uint_c(1));
+ const Vector3< uint_t > domainSize(uint_c(3), uint_c(3), uint_c(3));
+ const Vector3< uint_t > cellsPerBlock(domainSize[0] / numBlocks[0], domainSize[1] / numBlocks[1],
+ domainSize[2] / numBlocks[2]);
+
+ // create block grid
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ blockforest::createUniformBlockGrid(numBlocks[0], numBlocks[1], numBlocks[2], // blocks
+ cellsPerBlock[0], cellsPerBlock[1], cellsPerBlock[2], // cells
+ real_c(1.0), // dx
+ true, // one block per process
+ true, true, true); // periodicity
+
+ // create lattice model (dummy, not relevant for this test)
+ LatticeModel_T latticeModel = LatticeModel_T(lbm::collision_model::SRT(real_c(1)));
+
+ // add fields
+ const BlockDataID pdfFieldID = lbm::addPdfFieldToStorage(blockForest, "PDF field", latticeModel, field::fzyx);
+ BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill level field", real_c(0.0), field::fzyx, uint_c(1));
+ BlockDataID obstaclefillFieldID = field::addToStorage< ScalarField_T >(blockForest, "Obstacle fill level field",
+ real_c(0.0), field::fzyx, uint_c(1));
+ const BlockDataID obstacleNormalFieldID = field::addToStorage< VectorField_T >(
+ blockForest, "Obstacle normals", Vector3< real_t >(real_c(0)), field::fzyx, uint_c(1));
+
+ // add boundary handling
+ const std::shared_ptr< FreeSurfaceBoundaryHandling_T > freeSurfaceBoundaryHandling =
+ std::make_shared< FreeSurfaceBoundaryHandling_T >(blockForest, pdfFieldID, fillFieldID);
+ const BlockDataID flagFieldID = freeSurfaceBoundaryHandling->getFlagFieldID();
+ const BlockDataID boundaryHandlingID = freeSurfaceBoundaryHandling->getHandlingID();
+ const typename FreeSurfaceBoundaryHandling_T::FlagInfo_T& flagInfo = freeSurfaceBoundaryHandling->getFlagInfo();
+
+ // initialize domain
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ ScalarField_T* const fillField = blockIt->getData< ScalarField_T >(fillFieldID);
+ VectorField_T* const obstacleNormalField = blockIt->getData< VectorField_T >(obstacleNormalFieldID);
+ FreeSurfaceBoundaryHandling_T::BoundaryHandling_T* const boundaryHandling =
+ blockIt->getData< FreeSurfaceBoundaryHandling_T::BoundaryHandling_T >(boundaryHandlingID);
+
+ WALBERLA_FOR_ALL_CELLS_XYZ(fillField, {
+ // set no slip at domain boundaries in z-direction to reduce problem to 2D
+ if (z == cell_idx_c(0) || z == cell_idx_c(2))
+ {
+ boundaryHandling->setBoundary(FreeSurfaceBoundaryHandling_T::noSlipFlagID, x, y, z);
+
+ // obstacle normal must be normalized to not trigger the assertion in ObstacleFillLevelSweep
+ obstacleNormalField->get(x, y, z) = Vector3< real_t >(real_c(1), real_c(1), real_c(1)).getNormalized();
+ continue;
+ }
+
+ // obstacle cell (to be evaluated) in the domain center
+ if (x == cell_idx_c(1) && y == cell_idx_c(1) && z == cell_idx_c(1))
+ {
+ boundaryHandling->setBoundary(FreeSurfaceBoundaryHandling_T::noSlipFlagID, x, y, z);
+ obstacleNormalField->get(x, y, z) = centerObstacleNormal.getNormalized();
+ fillField->get(x, y, z) = real_c(-5); // dummy value to check that the value did not change
+ continue;
+ }
+
+ if (interfaceCells.find(Cell(x, y, z)) != interfaceCells.end())
+ {
+ boundaryHandling->setFlag(flagIDs::interfaceFlagID, x, y, z);
+ fillField->get(x, y, z) = interfaceCells.find(Cell(x, y, z))->second;
+ continue;
+ }
+
+ if (liquidCells.find(Cell(x, y, z)) != liquidCells.end())
+ {
+ boundaryHandling->setFlag(flagIDs::liquidFlagID, x, y, z);
+ fillField->get(x, y, z) = real_c(1);
+ continue;
+ }
+
+ if (gasCells.find(Cell(x, y, z)) != gasCells.end())
+ {
+ boundaryHandling->setFlag(flagIDs::gasFlagID, x, y, z);
+ fillField->get(x, y, z) = real_c(0);
+ continue;
+ }
+
+ if (solidCells.find(Cell(x, y, z)) != solidCells.end())
+ {
+ boundaryHandling->setFlag(FreeSurfaceBoundaryHandling_T::noSlipFlagID, x, y, z);
+
+ // obstacle normal must be normalized to not trigger the assertion in ObstacleFillLevelSweep
+ obstacleNormalField->get(x, y, z) = Vector3< real_t >(real_c(1), real_c(1), real_c(1)).getNormalized();
+ continue;
+ }
+ }) // WALBERLA_FOR_ALL_CELLS_XYZ
+ }
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, 1);
+
+ // add ObstacleFillLevelSweep
+ ObstacleFillLevelSweep< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > obstFillSweep(
+ obstaclefillFieldID, fillFieldID, flagFieldID, obstacleNormalFieldID, flagIDs::liquidInterfaceGasFlagIDs,
+ flagInfo.getObstacleIDSet());
+ timeloop.add() << Sweep(obstFillSweep, "Obstacle fill level sweep");
+
+ timeloop.singleStep();
+
+ real_t obstacleFillLevel = real_c(0);
+
+ // get fill level of (central) solid cell
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ const ScalarField_T* const obstaclefillField = blockIt->getData< const ScalarField_T >(obstaclefillFieldID);
+
+ obstacleFillLevel = obstaclefillField->get(cell_idx_c(1), cell_idx_c(1), cell_idx_c(1));
+ }
+
+ return obstacleFillLevel;
+}
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+
+ Vector3< real_t > centerObstacleNormal;
+ std::unordered_map< Cell, real_t > interfaceCells;
+ std::unordered_set< Cell > liquidCells;
+ std::unordered_set< Cell > gasCells;
+ std::unordered_set< Cell > solidCells;
+ real_t expectedFillLevel;
+ real_t computedFillLevel;
+
+ // IMPORTANT REMARK:
+ // the fill level of the obstacle center cell at (1, 1, 1) is going to be computed; therefore, Cell(1, 1, 1) must not
+ // be set here
+
+ // test case 1: interface neighbors at the top, no liquid or gas neighbors, remaining cells are solid, obstacle
+ // normal points upwards
+ WALBERLA_LOG_RESULT("Performing test case 1")
+ centerObstacleNormal = Vector3< real_t >(real_c(0), real_c(1), real_c(0));
+ solidCells.emplace(Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(1)));
+ solidCells.emplace(Cell(cell_idx_c(1), cell_idx_c(0), cell_idx_c(1)));
+ solidCells.emplace(Cell(cell_idx_c(2), cell_idx_c(0), cell_idx_c(1)));
+ solidCells.emplace(Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(1)));
+ solidCells.emplace(Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(1)));
+ interfaceCells.emplace(Cell(cell_idx_c(0), cell_idx_c(2), cell_idx_c(1)), real_c(0.5));
+ interfaceCells.emplace(Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(1)), real_c(0.5));
+ interfaceCells.emplace(Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(1)), real_c(0.5));
+ expectedFillLevel = real_c(0.5); // verified by hand
+ computedFillLevel =
+ computeObstacleFillLevel(interfaceCells, liquidCells, gasCells, solidCells, centerObstacleNormal);
+ WALBERLA_CHECK_FLOAT_EQUAL(expectedFillLevel, computedFillLevel)
+
+ interfaceCells.clear();
+ liquidCells.clear();
+ gasCells.clear();
+ solidCells.clear();
+
+ // test case 2: interface neighbors at the top, left cell is liquid, right cell is gas, bottom cells are solid,
+ // obstacle normal points upwards
+ WALBERLA_LOG_RESULT("Performing test case 2")
+ centerObstacleNormal = Vector3< real_t >(real_c(0), real_c(1), real_c(0));
+ solidCells.emplace(Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(1)));
+ solidCells.emplace(Cell(cell_idx_c(1), cell_idx_c(0), cell_idx_c(1)));
+ solidCells.emplace(Cell(cell_idx_c(2), cell_idx_c(0), cell_idx_c(1)));
+ interfaceCells.emplace(Cell(cell_idx_c(0), cell_idx_c(2), cell_idx_c(1)), real_c(0.75));
+ interfaceCells.emplace(Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(1)), real_c(0.5));
+ interfaceCells.emplace(Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(1)), real_c(0.5));
+ liquidCells.emplace(Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(1)));
+ gasCells.emplace(Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(1)));
+ expectedFillLevel = real_c(0.5732233); // verified by hand
+ computedFillLevel =
+ computeObstacleFillLevel(interfaceCells, liquidCells, gasCells, solidCells, centerObstacleNormal);
+ WALBERLA_CHECK_FLOAT_EQUAL(expectedFillLevel, computedFillLevel)
+
+ interfaceCells.clear();
+ liquidCells.clear();
+ gasCells.clear();
+ solidCells.clear();
+
+ // test case 3: same as testcase 2 but obstacle normal points to the upper left corner
+ WALBERLA_LOG_RESULT("Performing test case 3")
+ centerObstacleNormal = Vector3< real_t >(real_c(-1), real_c(1), real_c(0));
+ solidCells.emplace(Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(1)));
+ solidCells.emplace(Cell(cell_idx_c(1), cell_idx_c(0), cell_idx_c(1)));
+ solidCells.emplace(Cell(cell_idx_c(2), cell_idx_c(0), cell_idx_c(1)));
+ interfaceCells.emplace(Cell(cell_idx_c(0), cell_idx_c(2), cell_idx_c(1)), real_c(0.75));
+ interfaceCells.emplace(Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(1)), real_c(0.5));
+ interfaceCells.emplace(Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(1)), real_c(0.5));
+ liquidCells.emplace(Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(1)));
+ gasCells.emplace(Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(1)));
+ expectedFillLevel = real_c(0.58009431); // verified by hand
+ computedFillLevel =
+ computeObstacleFillLevel(interfaceCells, liquidCells, gasCells, solidCells, centerObstacleNormal);
+ WALBERLA_CHECK_FLOAT_EQUAL(expectedFillLevel, computedFillLevel)
+
+ interfaceCells.clear();
+ liquidCells.clear();
+ gasCells.clear();
+ solidCells.clear();
+
+ // test case 4: only interface cells in neighborhood (all with same fill level)
+ WALBERLA_LOG_RESULT("Performing test case 4")
+ centerObstacleNormal = Vector3< real_t >(real_c(-1), real_c(1), real_c(0));
+ interfaceCells.emplace(Cell(cell_idx_c(0), cell_idx_c(0), cell_idx_c(1)), real_c(0.5));
+ interfaceCells.emplace(Cell(cell_idx_c(1), cell_idx_c(0), cell_idx_c(1)), real_c(0.5));
+ interfaceCells.emplace(Cell(cell_idx_c(2), cell_idx_c(0), cell_idx_c(1)), real_c(0.5));
+ interfaceCells.emplace(Cell(cell_idx_c(0), cell_idx_c(1), cell_idx_c(1)), real_c(0.5));
+ interfaceCells.emplace(Cell(cell_idx_c(2), cell_idx_c(1), cell_idx_c(1)), real_c(0.5));
+ interfaceCells.emplace(Cell(cell_idx_c(0), cell_idx_c(2), cell_idx_c(1)), real_c(0.5));
+ interfaceCells.emplace(Cell(cell_idx_c(1), cell_idx_c(2), cell_idx_c(1)), real_c(0.5));
+ interfaceCells.emplace(Cell(cell_idx_c(2), cell_idx_c(2), cell_idx_c(1)), real_c(0.5));
+ expectedFillLevel = real_c(0.5); // dummy value as initialized in code above
+ computedFillLevel =
+ computeObstacleFillLevel(interfaceCells, liquidCells, gasCells, solidCells, centerObstacleNormal);
+ WALBERLA_CHECK_FLOAT_EQUAL(expectedFillLevel, computedFillLevel)
+
+ return EXIT_SUCCESS;
+}
+} // namespace ObstacleFillLevelTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::ObstacleFillLevelTest::main(argc, argv); }
\ No newline at end of file
diff --git a/tests/lbm/free_surface/surface_geometry/ObstacleNormalsTest.cpp b/tests/lbm/free_surface/surface_geometry/ObstacleNormalsTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..0d45f6685679d9ff08a018049a4ddacfc56ae048
--- /dev/null
+++ b/tests/lbm/free_surface/surface_geometry/ObstacleNormalsTest.cpp
@@ -0,0 +1,186 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file ObstacleNormalsTest.cpp
+//! \ingroup lbm/free_surface/surface_geometry
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Test if mean obstacle normal computation is correct in setup with inclined plane and different inclination
+//! angles.
+//
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+#include "core/math/Constants.h"
+
+#include "field/AddToStorage.h"
+
+#include "lbm/free_surface/surface_geometry/ObstacleNormalSweep.h"
+
+#include "stencil/D3Q27.h"
+#include "stencil/D3Q7.h"
+
+#include "timeloop/SweepTimeloop.h"
+
+#include <cmath>
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace ObstacleNormalsTest
+{
+// define types
+using Stencil_T = stencil::D3Q27;
+using flag_t = uint8_t;
+
+const FlagUID Fluid_Flag("fluid");
+const FlagUID FluidNearSolid_Flag("fluid near solid");
+const FlagUID Solid_Flag("no slip");
+const Set< FlagUID > All_Fluid_Flags = setUnion< FlagUID >(Fluid_Flag, FluidNearSolid_Flag);
+
+// define fields
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+using FlagField_T = FlagField< flag_t >;
+
+void test(real_t degreeInclinationAngle)
+{
+ // define the domain size
+ const Vector3< uint_t > numBlocks(uint_c(1));
+ const Vector3< uint_t > domainSize(uint_c(20), uint_c(3), uint_c(20));
+ const Vector3< uint_t > cellsPerBlock(domainSize[0] / numBlocks[0], domainSize[1] / numBlocks[1],
+ domainSize[2] / numBlocks[2]);
+
+ // create block grid
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ blockforest::createUniformBlockGrid(numBlocks[0], numBlocks[1], numBlocks[2], // blocks
+ cellsPerBlock[0], cellsPerBlock[1], cellsPerBlock[2], // cells
+ real_c(1.0), // dx
+ true, // one block per process
+ false, false, false); // periodicity
+
+ // add fields
+ BlockDataID obstacleNormalFieldID = field::addToStorage< VectorField_T >(
+ blockForest, "Obstacle normals", Vector3< real_t >(real_c(0)), field::fzyx, uint_c(1));
+ BlockDataID flagFieldID = field::addFlagFieldToStorage< FlagField_T >(
+ blockForest, "flags", uint_c(2)); // flag field must have two ghost layers as in regular FSLBM application code
+
+ // initialize flag field as inclination, the lower part of the domain will be solid
+ const real_t tanAngle = real_c(std::tan(degreeInclinationAngle * math::pi / real_c(180)));
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ FlagField_T* const flagField = blockIt->getData< FlagField_T >(flagFieldID);
+
+ const auto fluidFlag = flagField->registerFlag(Fluid_Flag);
+ const auto fluidNearSolidFlag = flagField->registerFlag(FluidNearSolid_Flag);
+ const auto solidFlag = flagField->registerFlag(Solid_Flag);
+
+ // create inclination in flag field
+ WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ(
+ flagField, uint_c(2),
+ // all cells below the specified inclination angle are marked as solid
+ if (real_c(x) * tanAngle <= real_c(z)) { flagField->get(x, y, z) = solidFlag; } else {
+ flagField->get(x, y, z) = fluidFlag;
+ }); // WALBERLA_FOR_ALL_CELLS_INCLUDING_GHOST_LAYER_XYZ
+
+ // mark fluid cells that have neighboring solid cells ( only in these cells, the obstacle normal will be computed)
+ WALBERLA_FOR_ALL_CELLS(
+ flagFieldIt, flagField,
+ if (isFlagSet(flagFieldIt, solidFlag) && isFlagInNeighborhood< stencil::D3Q7 >(flagFieldIt, fluidFlag)) {
+ *flagFieldIt = fluidNearSolidFlag;
+ }); // WALBERLA_FOR_ALL_CELLS
+ }
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, uint_c(1));
+
+ // add obstacle normals sweep
+ ObstacleNormalSweep< Stencil_T, FlagField_T, VectorField_T > obstNormalsSweep(
+ obstacleNormalFieldID, flagFieldID, FluidNearSolid_Flag, All_Fluid_Flags, Solid_Flag, true, false, false);
+ timeloop.add() << Sweep(obstNormalsSweep, "Obstacle normals sweep");
+
+ // perform a single time step
+ timeloop.singleStep();
+
+ // compute analytical normal
+ const real_t sinAngle = real_c(std::sin(degreeInclinationAngle * math::pi / real_c(180)));
+ const real_t cosAngle = real_c(std::cos(degreeInclinationAngle * math::pi / real_c(180)));
+ const Vector3< real_t > analyticalNormal(-sinAngle, real_c(0), cosAngle);
+
+ // compare analytical normal with the average of all computed obstacle normals
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ const VectorField_T* const obstacleNormalField = blockIt->getData< const VectorField_T >(obstacleNormalFieldID);
+ const FlagField_T* const flagField = blockIt->getData< const FlagField_T >(flagFieldID);
+
+ const auto fluidNearSolidFlag = flagField->getFlag(FluidNearSolid_Flag);
+
+ real_t averageObstNormalX = real_c(0);
+ real_t averageObstNormalY = real_c(0);
+ real_t averageObstNormalZ = real_c(0);
+ uint_t cellCount = uint_c(0);
+ WALBERLA_FOR_ALL_CELLS_XYZ_OMP(obstacleNormalField,
+ omp parallel for schedule(static) reduction(+:averageObstNormalX) reduction(+:averageObstNormalY)
+ reduction(+:averageObstNormalZ) reduction(+:cellCount), {
+ // skip cells at the domain boundary; obstacle normal in these cells deviates further from analytical solution
+ // since neighborhood for obstacle computation is too small
+ if (x == cell_idx_c(0) || y == cell_idx_c(0) || z == cell_idx_c(0) ||
+ x == cell_idx_c(domainSize[0] - uint_c(1)) || y == cell_idx_c(domainSize[1] - uint_c(1)) ||
+ z == cell_idx_c(domainSize[2] - uint_c(1)))
+ {
+ continue;
+ }
+
+ if (!isFlagSet(flagField->get(x, y, z), fluidNearSolidFlag))
+ {
+ // obstacle normal must be zero in all cells that are not of type fluidNearSolid
+ WALBERLA_CHECK_FLOAT_EQUAL(obstacleNormalField->get(x, y, z), Vector3< real_t >(real_c(0)));
+ }
+ else
+ {
+ ++cellCount;
+ averageObstNormalX += obstacleNormalField->get(x, y, z)[0];
+ averageObstNormalY += obstacleNormalField->get(x, y, z)[1];
+ averageObstNormalZ += obstacleNormalField->get(x, y, z)[2];
+ }}); // WALBERLA_FOR_ALL_CELLS_XYZ_OMP
+
+ // compute average obstacle normal
+ Vector3< real_t > averageObstNormal(averageObstNormalX, averageObstNormalY, averageObstNormalZ);
+ averageObstNormal /= real_c(cellCount);
+
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(averageObstNormal, analyticalNormal, real_c(0.1));
+ }
+}
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+ // test with various inclination angles (only up to 87 degree, as otherwise in this setup no more fluid cells remain)
+ for (uint_t angle = uint_c(1); angle <= uint_c(86); angle += uint_c(1))
+ {
+ WALBERLA_LOG_INFO_ON_ROOT("Testing inclination angle " << real_c(angle) << " degree.")
+ test(real_c(angle));
+ }
+
+ return EXIT_SUCCESS;
+}
+} // namespace ObstacleNormalsTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::ObstacleNormalsTest::main(argc, argv); }
\ No newline at end of file
diff --git a/tests/lbm/free_surface/surface_geometry/WettingCurvatureTest.cpp b/tests/lbm/free_surface/surface_geometry/WettingCurvatureTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..2bcff6248899965c14434f594187204c633c0a0e
--- /dev/null
+++ b/tests/lbm/free_surface/surface_geometry/WettingCurvatureTest.cpp
@@ -0,0 +1,341 @@
+//======================================================================================================================
+//
+// This file is part of waLBerla. waLBerla is free software: you can
+// redistribute it and/or modify it under the terms of the GNU General Public
+// License as published by the Free Software Foundation, either version 3 of
+// the License, or (at your option) any later version.
+//
+// waLBerla is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+// for more details.
+//
+// You should have received a copy of the GNU General Public License along
+// with waLBerla (see COPYING.txt). If not, see <http://www.gnu.org/licenses/>.
+//
+//! \file WettingCurvatureTest.cpp
+//! \ingroup lbm/free_surface/surface_geometry
+//! \author Christoph Schwarzmeier <christoph.schwarzmeier@fau.de>
+//! \brief Initialize a drop as a cylinder section near a solid wall and evaluate the resulting wetting curvature.
+//
+//======================================================================================================================
+
+#include "blockforest/Initialization.h"
+
+#include "core/Environment.h"
+#include "core/debug/TestSubsystem.h"
+#include "core/logging/Logging.h"
+
+#include "field/AddToStorage.h"
+#include "field/vtk/FlagFieldCellFilter.h"
+#include "field/vtk/VTKWriter.h"
+
+#include "geometry/bodies/Cylinder.h"
+#include "geometry/initializer/OverlapFieldFromBody.h"
+
+#include "lbm/free_surface/surface_geometry/ContactAngle.h"
+#include "lbm/free_surface/surface_geometry/CurvatureSweep.h"
+#include "lbm/free_surface/surface_geometry/NormalSweep.h"
+#include "lbm/free_surface/surface_geometry/ObstacleFillLevelSweep.h"
+#include "lbm/free_surface/surface_geometry/ObstacleNormalSweep.h"
+#include "lbm/free_surface/surface_geometry/SmoothingSweep.h"
+
+#include "stencil/D3Q27.h"
+
+#include "timeloop/SweepTimeloop.h"
+
+#include "vtk/Initialization.h"
+#include "vtk/VTKOutput.h"
+
+namespace walberla
+{
+namespace free_surface
+{
+namespace WettingCurvatureTest
+{
+// define types
+using Stencil_T = stencil::D3Q27;
+
+using flag_t = uint32_t;
+
+const FlagUID liquidFlagID("liquid");
+const FlagUID interfaceFlagID("interface");
+const FlagUID gasFlagID("gas");
+const FlagUID solidID("solid");
+const Set< FlagUID > liquidInterfaceGasFlagIDs =
+ setUnion< FlagUID >(setUnion< FlagUID >(liquidFlagID, interfaceFlagID), gasFlagID);
+
+// define fields
+using ScalarField_T = GhostLayerField< real_t, 1 >;
+using VectorField_T = GhostLayerField< Vector3< real_t >, 1 >;
+using FlagField_T = FlagField< flag_t >;
+
+real_t computeCurvature(real_t contactAngle, bool useTriangulation)
+{
+ // define the domain size
+ const Vector3< uint_t > numBlocks(uint_c(1));
+ const Vector3< uint_t > domainSize(uint_c(6), uint_c(5), uint_c(5));
+ const Vector3< uint_t > cellsPerBlock(domainSize[0] / numBlocks[0], domainSize[1] / numBlocks[1],
+ domainSize[2] / numBlocks[2]);
+
+ // create block grid
+ const std::shared_ptr< StructuredBlockForest > blockForest =
+ blockforest::createUniformBlockGrid(numBlocks[0], numBlocks[1], numBlocks[2], // blocks
+ cellsPerBlock[0], cellsPerBlock[1], cellsPerBlock[2], // cells
+ real_c(1.0), // dx
+ true, // one block per process
+ false, false, false); // periodicity
+
+ // add fields
+ BlockDataID fillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Fill levels", real_c(0.0), field::fzyx, uint_c(1));
+ BlockDataID normalFieldID = field::addToStorage< VectorField_T >(
+ blockForest, "Normals", Vector3< real_t >(real_c(0)), field::fzyx, uint_c(1));
+ BlockDataID curvatureFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Curvature", real_c(0), field::fzyx, uint_c(1));
+ BlockDataID obstacleNormalFieldID = field::addToStorage< VectorField_T >(
+ blockForest, "Obstacle normal field", Vector3< real_t >(real_c(0)), field::fzyx, uint_c(1));
+ BlockDataID flagFieldID = field::addFlagFieldToStorage< FlagField_T >(
+ blockForest, "Flags", uint_c(2)); // flag field must have two ghost layers as in regular FSLBM application code
+ BlockDataID smoothFillFieldID =
+ field::addToStorage< ScalarField_T >(blockForest, "Smooth fill levels", real_c(1.0), field::fzyx, uint_c(1));
+
+ // add liquid drop
+ Vector3< real_t > midpoint1(real_c(5), real_c(1), real_c(0));
+ Vector3< real_t > midpoint2(real_c(5), real_c(1), real_c(5));
+ geometry::Cylinder cylinder(midpoint1, midpoint2, real_c(5) * real_c(0.5));
+ geometry::initializer::OverlapFieldFromBody(*blockForest, fillFieldID).init(cylinder, true);
+
+ // set flags
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ FlagField_T* const flagField = blockIt->getData< FlagField_T >(flagFieldID);
+ ScalarField_T* const fillField = blockIt->getData< ScalarField_T >(fillFieldID);
+
+ const auto gas = flagField->registerFlag(gasFlagID);
+ const auto liquid = flagField->registerFlag(liquidFlagID);
+ const auto interface = flagField->registerFlag(interfaceFlagID);
+ const auto solid = flagField->registerFlag(solidID);
+
+ // initialize whole flag field as gas
+ WALBERLA_FOR_ALL_CELLS(flagFieldIt, flagField, { *flagFieldIt = gas; }) // WALBERLA_FOR_ALL_CELLS
+
+ // initialize flag field according to fill level
+ WALBERLA_FOR_ALL_CELLS_XYZ(
+ flagField,
+ if (y == 0) {
+ flagField->get(x, y, z) = solid;
+ fillField->get(x, y, z) = real_c(0);
+ }
+
+ if (fillField->get(x, y, z) <= real_c(0) && flagField->get(x, y, z) != solid) {
+ flagField->get(x, y, z) = gas;
+ }
+
+ if (fillField->get(x, y, z) >= real_c(1)) { flagField->get(x, y, z) = liquid; }
+
+ // not using else here to avoid overwriting solid flags
+ if (fillField->get(x, y, z) < real_c(1) && fillField->get(x, y, z) > real_c(0)) {
+ flagField->get(x, y, z) = interface;
+ }) // WALBERLA_FOR_ALL_CELLS_XYZ
+ }
+
+ ContactAngle contactAngleObj = ContactAngle(contactAngle);
+
+ // create timeloop
+ SweepTimeloop timeloop(blockForest, uint_c(1));
+
+ if (useTriangulation) // use local triangulation for curvature computation
+ {
+ // add sweep for computing obstacle normals in interface cells near obstacle cells
+ ObstacleNormalSweep< Stencil_T, FlagField_T, VectorField_T > obstNormalsSweep(
+ obstacleNormalFieldID, flagFieldID, interfaceFlagID, liquidInterfaceGasFlagIDs, solidID, true, false, false);
+ timeloop.add() << Sweep(obstNormalsSweep, "Obstacle normals sweep");
+
+ // add sweep for computing interface normals
+ NormalSweep< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > normalsSweep(
+ normalFieldID, fillFieldID, flagFieldID, interfaceFlagID, liquidInterfaceGasFlagIDs, solidID, false, false,
+ true, false);
+ timeloop.add() << Sweep(normalsSweep, "Normal sweep");
+
+ // add sweep for computing curvature (including wetting)
+ CurvatureSweepLocalTriangulation< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > curvatureSweep(
+ blockForest, curvatureFieldID, normalFieldID, fillFieldID, flagFieldID, obstacleNormalFieldID, interfaceFlagID,
+ solidID, true, contactAngleObj);
+ timeloop.add() << Sweep(curvatureSweep, "Curvature sweep");
+ }
+ else // use finite differences for curvature computation
+ {
+ // add sweep for computing obstacle normals in obstacle cells
+ ObstacleNormalSweep< Stencil_T, FlagField_T, VectorField_T > obstNormalsSweep(
+ obstacleNormalFieldID, flagFieldID, interfaceFlagID, liquidInterfaceGasFlagIDs, solidID, false, true, true);
+ timeloop.add() << Sweep(obstNormalsSweep, "Obstacle normals sweep");
+
+ // add sweep for reflecting fill level into obstacle cells
+ ObstacleFillLevelSweep< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > obstacleFillLevelSweep(
+ smoothFillFieldID, fillFieldID, flagFieldID, obstacleNormalFieldID, liquidInterfaceGasFlagIDs, solidID);
+ timeloop.add() << Sweep(obstacleFillLevelSweep, "Obstacle fill level sweep");
+
+ // add sweep for smoothing the fill level field (uses fill level values from obstacle cells set by
+ // ObstacelFillLevelSweep)
+ SmoothingSweep< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > smoothingSweep(
+ smoothFillFieldID, fillFieldID, flagFieldID, liquidInterfaceGasFlagIDs, solidID, true);
+ timeloop.add() << Sweep(smoothingSweep, "Smoothing sweep");
+
+ // add sweep for computing interface normals
+ NormalSweep< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > normalsSweep(
+ normalFieldID, smoothFillFieldID, flagFieldID, interfaceFlagID, liquidInterfaceGasFlagIDs, solidID, true, true,
+ false, true);
+ timeloop.add() << Sweep(normalsSweep, "Normal sweep");
+
+ // add sweep for computing curvature (including wetting)
+ CurvatureSweepFiniteDifferences< Stencil_T, FlagField_T, ScalarField_T, VectorField_T > curvatureSweep(
+ curvatureFieldID, normalFieldID, obstacleNormalFieldID, flagFieldID, interfaceFlagID,
+ liquidInterfaceGasFlagIDs, solidID, true, contactAngleObj);
+ timeloop.add() << Sweep(curvatureSweep, "Curvature sweep");
+ }
+
+ // run one time step
+ timeloop.singleStep();
+
+ // get the curvature in cell (2, 1, 2)
+ real_t curvature = real_c(0);
+ for (auto blockIt = blockForest->begin(); blockIt != blockForest->end(); ++blockIt)
+ {
+ const ScalarField_T* const curvatureField = blockIt->getData< const ScalarField_T >(curvatureFieldID);
+ curvature = curvatureField->get(2, 1, 2);
+ }
+
+ // auto vtkFlagField =
+ // field::createVTKOutput< FlagField_T >(flagFieldID, *blockForest, "flag_field", uint_c(1), uint_c(0));
+ // vtkFlagField();
+ // auto vtkFillField =
+ // field::createVTKOutput< ScalarField_T >(fillFieldID, *blockForest, "fill_field", uint_c(1), uint_c(0));
+ // vtkFillField();
+ // auto vtkCurvatureField =
+ // field::createVTKOutput< ScalarField_T >(curvatureFieldID, *blockForest, "curvature_field", uint_c(1),
+ // uint_c(0));
+ // vtkCurvatureField();
+ // auto vtkNormalField =
+ // field::createVTKOutput< VectorField_T >(normalFieldID, *blockForest, "normal_field", uint_c(1), uint_c(0));
+ // vtkNormalField();
+ // auto vtkObstNormalField = field::createVTKOutput< VectorField_T >(obstacleNormalFieldID, *blockForest,
+ // "obst_normal_field", uint_c(1), uint_c(0));
+ // vtkObstNormalField();
+ // auto vtkSmoothFillField = field::createVTKOutput< ScalarField_T >(smoothFillFieldID, *blockForest,
+ // "smooth_fill_field", uint_c(1), uint_c(0));
+ // vtkSmoothFillField();
+
+ return curvature;
+}
+
+// the following values have been obtained with a version of the local triangulation curvature computation algorithm
+// that is assumed to be correct (the angles computed in computeArtificalWallPoint() have been manually verified with
+// ParaView for some of the values)
+std::vector< std::pair< real_t, real_t > > expectedSolutionTriangulation()
+{
+ // pair contains: [0] contact angle, [1] expected curvature
+ std::vector< std::pair< real_t, real_t > > testcases;
+
+ testcases.emplace_back(real_c(0), real_c(-0.208893));
+ testcases.emplace_back(real_c(1), real_c(-0.208832));
+ testcases.emplace_back(real_c(10), real_c(-0.202813));
+ testcases.emplace_back(real_c(30), real_c(-0.15704));
+ testcases.emplace_back(real_c(45), real_c(-0.0994945));
+ testcases.emplace_back(real_c(65), real_c(-0.00311236));
+ testcases.emplace_back(real_c(65.5), real_c(-0.000512801));
+
+ // IMPORTANT REMARK REGARDING THE CHANGE IN THE SIGN OF THE CURVATURE:
+ // A change in the sign of the curvature would only be expected when the specified contact angle is equivalent to the
+ // angle that is already present. However, the algorithm ensures that the constructed virtual wall point is valid
+ // during curvature computation (such that the computed triangle by local triangulation is not degenerated).
+ // Therefore, the algorithm internally changes the target contact angle (see lines 10 to 17 in algorithm 6.2 in
+ // dissertation of S. Donath). The specified contact angle will then slowly be approached in subsequent time steps.
+
+ testcases.emplace_back(real_c(65.8), real_c(0.00105015));
+ testcases.emplace_back(real_c(66), real_c(0.00209344));
+ testcases.emplace_back(real_c(66.5), real_c(0.00470618));
+ testcases.emplace_back(real_c(67), real_c(0.00732526));
+ testcases.emplace_back(real_c(70), real_c(0.0231628));
+ testcases.emplace_back(real_c(75), real_c(0.0499505));
+ testcases.emplace_back(real_c(77), real_c(0.0607714));
+ testcases.emplace_back(real_c(78), real_c(0.0661992));
+
+ // this contact angle is already reached by the initial setup
+ // => the algorithm should take the route with if(realIsEqual(...)) in CurvatureSweepTR
+ // => this route has been found to cause problems when using single precision (see comment in CurvatureSweepTR())
+#ifdef WALBERLA_DOUBLE_ACCURACY
+ testcases.emplace_back(real_c(78.40817854), real_c(0.0684177));
+#endif
+
+ testcases.emplace_back(real_c(80), real_c(0.0770832));
+ testcases.emplace_back(real_c(90), real_c(0.131739));
+ testcases.emplace_back(real_c(120), real_c(0.287743));
+ testcases.emplace_back(real_c(160), real_c(0.431406));
+ testcases.emplace_back(real_c(180), real_c(0.312837));
+
+ return testcases;
+}
+
+// the following values have been obtained with a version of the finite difference curvature computation algorithm
+// that is assumed to be correct
+std::vector< std::pair< real_t, real_t > > expectedSolutionFiniteDifferences()
+{
+ std::vector< std::pair< real_t, real_t > > testcases;
+
+ testcases.emplace_back(real_c(0), real_c(-0.0454018));
+ testcases.emplace_back(real_c(1), real_c(-0.0474911));
+ testcases.emplace_back(real_c(10), real_c(-0.0641205));
+ testcases.emplace_back(real_c(30), real_c(-0.0810346));
+ testcases.emplace_back(real_c(45), real_c(-0.0622399));
+ testcases.emplace_back(real_c(65), real_c(0.0397875));
+ testcases.emplace_back(real_c(65.5), real_c(0.0436974));
+ testcases.emplace_back(real_c(65.8), real_c(0.046073));
+ testcases.emplace_back(real_c(66), real_c(0.0476689));
+ testcases.emplace_back(real_c(66.5), real_c(0.0517007));
+ testcases.emplace_back(real_c(67), real_c(0.0557916));
+ testcases.emplace_back(real_c(70), real_c(0.0814937));
+ testcases.emplace_back(real_c(75), real_c(0.127884));
+ testcases.emplace_back(real_c(77), real_c(0.147265));
+ testcases.emplace_back(real_c(78), real_c(0.157051));
+ testcases.emplace_back(real_c(78.40817854), real_c(0.161057));
+ testcases.emplace_back(real_c(80), real_c(0.176711));
+ testcases.emplace_back(real_c(90), real_c(0.271672));
+ testcases.emplace_back(real_c(120), real_c(0.448388));
+ testcases.emplace_back(real_c(160), real_c(0.487812));
+ testcases.emplace_back(real_c(180), real_c(0.467033));
+
+ return testcases;
+}
+
+int main(int argc, char** argv)
+{
+ debug::enterTestMode();
+ Environment env(argc, argv);
+
+ // test with local triangulation curvature computation
+ std::vector< std::pair< real_t, real_t > > testcases = expectedSolutionTriangulation();
+ for (const auto& i : testcases)
+ {
+ WALBERLA_LOG_INFO_ON_ROOT("Testing contact angle=" << i.first
+ << " with local triangulation curvature computation");
+ const real_t curvature = computeCurvature(i.first, true);
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(curvature, i.second, real_c(1e-5));
+ }
+
+ // test with finite difference curvature computation
+ testcases = expectedSolutionFiniteDifferences();
+ for (const auto& i : testcases)
+ {
+ WALBERLA_LOG_INFO_ON_ROOT("Testing contact angle=" << i.first << " with finite difference curvature computation");
+ const real_t curvature = computeCurvature(i.first, false);
+ WALBERLA_CHECK_FLOAT_EQUAL_EPSILON(curvature, i.second, real_c(1e-6));
+ }
+
+ return EXIT_SUCCESS;
+}
+} // namespace WettingCurvatureTest
+} // namespace free_surface
+} // namespace walberla
+
+int main(int argc, char** argv) { return walberla::free_surface::WettingCurvatureTest::main(argc, argv); }
\ No newline at end of file