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Commit 0a27a955 authored by Markus Holzer's avatar Markus Holzer
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//======================================================================================================================
//
// 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 SuViscoelasticity.h
//! \ingroup lbm
//! \author Cameron Stewart <cstewart@icp.uni-stuttgart.de>
//! \brief Oldroyd-B viscoelasticity extended from Su et al. Phys. Rev. E, 2013
//
//======================================================================================================================
#pragma once
#include "blockforest/communication/UniformBufferedScheme.h"
#include "core/math/Matrix3.h"
#include <field/AddToStorage.h>
#include "field/GhostLayerField.h"
#include "field/communication/PackInfo.h"
#include "lbm/field/PdfField.h"
namespace walberla {
namespace lbm {
namespace viscoelastic {
template < typename LatticeModel_T , typename BoundaryHandling_T>
class Su {
public:
typedef GhostLayerField< Matrix3<real_t>, 1> StressField_T;
typedef GhostLayerField< Vector3<real_t>, 1> VelocityField_T;
typedef GhostLayerField< Vector3<real_t>, 1> ForceField_T;
typedef PdfField< LatticeModel_T > PdfField_T;
typedef shared_ptr< StructuredBlockForest > Blocks_T;
Su( Blocks_T blocks, BlockDataID force, BlockDataID pdfId, BlockDataID boundaryHandlingId, BlockDataID stressId, BlockDataID stressOldId, real_t lambda_p, real_t eta_p,
uint_t period = uint_c(1), bool compressibleFlag = false): blocks_( blocks ), forceId_( force ), pdfId_(pdfId), boundaryHandlingId_(boundaryHandlingId), stressId_(stressId), stressOldId_(stressOldId),
inv_lambda_p_( real_c(1.0)/lambda_p ), eta_p_( eta_p ), delta_t_( real_c(period) ), executionCount_( 0 ), communicateStress_(blocks),
communicateVelocities_(blocks), compressibleFlag_(compressibleFlag)
{
// create velocity fields
velocityId_ = walberla::field::addToStorage<VelocityField_T>( blocks_, "Velocity Field", Vector3<real_t>(0.0), field::zyxf, uint_c(1));
// stress and velocity communication scheme
communicateStress_.addPackInfo( make_shared< field::communication::PackInfo<StressField_T> >( stressId_ ));
communicateVelocities_.addPackInfo( make_shared< field::communication::PackInfo<VelocityField_T> >( velocityId_ ));
WALBERLA_ASSERT_GREATER_EQUAL(delta_t_, real_c(1.0));
}
Su( Blocks_T blocks, BlockDataID force, BlockDataID pdfId, BlockDataID boundaryHandlingId, BlockDataID stressId, BlockDataID stressOldId, BlockDataID velocityId, real_t lambda_p, real_t eta_p,
uint_t period = uint_c(1), bool compressibleFlag = false): blocks_( blocks ), forceId_( force ), pdfId_(pdfId), boundaryHandlingId_(boundaryHandlingId), stressId_(stressId), stressOldId_(stressOldId),
velocityId_(velocityId), inv_lambda_p_( real_c(1.0)/lambda_p ), eta_p_( eta_p ), delta_t_( real_c(period) ), executionCount_( 0 ), communicateStress_(blocks),
communicateVelocities_(blocks), compressibleFlag_(compressibleFlag)
{
// stress and velocity communication scheme
communicateStress_.addPackInfo( make_shared< field::communication::PackInfo<StressField_T> >( stressId_ ));
communicateVelocities_.addPackInfo( make_shared< field::communication::PackInfo<VelocityField_T> >( velocityId_ ));
WALBERLA_ASSERT_GREATER_EQUAL(delta_t_, real_c(1.0));
}
void calculateStresses(IBlock * block) {
StressField_T *stressNew = block->getData<StressField_T>(stressId_);
StressField_T *stressOld = block->getData<StressField_T>(stressOldId_);
VelocityField_T *velocity = block->getData<VelocityField_T>(velocityId_);
PdfField_T *pdf = block->getData<PdfField_T>(pdfId_);
BoundaryHandling_T * boundaryHandling = block->getData< BoundaryHandling_T >( boundaryHandlingId_ );
WALBERLA_ASSERT_GREATER_EQUAL(stressOld->nrOfGhostLayers(), 2);
WALBERLA_ASSERT_GREATER_EQUAL(velocity->nrOfGhostLayers(), 1);
WALBERLA_FOR_ALL_CELLS_XYZ(stressNew, {
Cell cell(x,y,z);
Matrix3<real_t> stress1 = Matrix3<real_t>(0.0);
Matrix3<real_t> stress2 = Matrix3<real_t>(0.0);
Matrix3<real_t> stress3 = Matrix3<real_t>(0.0);
Matrix3<real_t> relstr = Matrix3<real_t>(0.0);
bool nearBoundaryFlag = false;
// if cell is a fluid cell then calculate the stress tensor
if (boundaryHandling->isDomain(cell)) {
// check if near a wall
if (boundaryHandling->isNearBoundary(cell)) {
nearBoundaryFlag = true;
}
else {
for (auto d = LatticeModel_T::Stencil::beginNoCenter(); d != LatticeModel_T::Stencil::end(); ++d) {
Cell cell1 = cell - *d;
if (boundaryHandling->isNearBoundary(cell1)) {
nearBoundaryFlag = true;
}
}
}
for (auto d = LatticeModel_T::Stencil::beginNoCenter(); d != LatticeModel_T::Stencil::end(); ++d) {
Cell cell1 = cell - *d;
Cell cell2 = cell1 - *d;
Cell cell3 = cell + *d;
// check if using compressible of incompressible algorithm
if (compressibleFlag_) {
if (nearBoundaryFlag) {
if (boundaryHandling->isDomain(cell1)) {
stress1 += (stressOld->get(cell1) * pdf->get(cell, d.toIdx())) * real_c(1 / 2.0);
}
if (boundaryHandling->isDomain(cell3)) {
stress2 += (stressOld->get(cell) * pdf->get(cell, d.toIdx())) * real_c(1 / 1.5);
}
}
else {
stress1 += stressOld->get(cell1) * pdf->get(cell, d.toIdx());
stress2 += stressOld->get(cell) * pdf->get(cell, d.toIdx());
stress3 += stressOld->get(cell2) * pdf->get(cell, d.toIdx());
}
}
else {
if (nearBoundaryFlag) {
if (boundaryHandling->isDomain(cell1)) {
stress1 += (stressOld->get(cell1) * pdf->get(cell1, d.toIdx())) * real_c(1 / 2.0);
}
if (boundaryHandling->isDomain(cell3)) {
stress2 += (stressOld->get(cell) * pdf->get(cell, d.toIdx())) * real_c(1 / 1.5);
}
}
else {
stress1 += stressOld->get(cell1) * pdf->get(cell1, d.toIdx());
stress2 += stressOld->get(cell) * pdf->get(cell, d.toIdx());
stress3 += stressOld->get(cell2) * pdf->get(cell2, d.toIdx());
}
}
}
Matrix3<real_t> gradu = Matrix3<real_t>(0.0);
// compute velocity gradient
for (auto d = LatticeModel_T::Stencil::beginNoCenter(); d.direction() != stencil::NW; ++d) {
for (uint_t a = 0; a < LatticeModel_T::Stencil::D; ++a) {
for (uint_t b = 0; b < LatticeModel_T::Stencil::D; ++b) {
if(boundaryHandling->isDomain(cell + *d) ) {
gradu(b, a) += velocity->get(cell + *d)[a] * real_c(d.c(b)) * real_c(0.5);
} else if(boundaryHandling->isDomain(cell - *d)){
gradu(b, a) += velocity->get(cell - *d)[a] * real_c(d.c(b)) * real_c(-0.5) + velocity->get(cell)[a] * real_c(d.c(b));
}
}
}
}
auto graduT = gradu.getTranspose();
// equation 16 from Su 2013
relstr = stressOld->get(cell) * gradu + graduT * stressOld->get(cell);
if(eta_p_ > real_t(0)) {
relstr += ((gradu + graduT) * eta_p_ - stressOld->get(cell)) * inv_lambda_p_;
}
// equation 23 from Su 2013
stressNew->get(cell) = stressOld->get(cell) + (stress1 * real_c(2.0) - stress2 * real_c(1.5) - stress3 * real_c(0.5)) * delta_t_ * (real_c(1.0) / pdf->getDensity(cell)) +
relstr * delta_t_;
}
})
}
void swapStressBuffers( IBlock * block ){
StressField_T * stressNew = block->getData< StressField_T >(stressId_);
StressField_T * stressOld = block->getData< StressField_T >(stressOldId_);
// swap pointers to old and new stress fields
stressOld->swapDataPointers(stressNew);
}
void cacheVelocity( IBlock * block ){
VelocityField_T * velocity = block->getData< VelocityField_T >(velocityId_);
PdfField_T * pdf = block->getData< PdfField_T >(pdfId_);
BoundaryHandling_T * boundaryHandling = block->getData< BoundaryHandling_T >( boundaryHandlingId_ );
WALBERLA_ASSERT_GREATER_EQUAL( velocity->nrOfGhostLayers(), 1 );
// update velocity field for all fluid cells
WALBERLA_FOR_ALL_CELLS_XYZ(velocity,{
Cell cell(x, y, z);
if( boundaryHandling->isDomain(cell) ) {
velocity->get( cell ) = pdf->getVelocity(x, y, z);
}
})
}
void calculateForces( IBlock * block ) {
using namespace stencil;
StressField_T * stress = block->getData< StressField_T >(stressId_);
ForceField_T * force = block->getData< ForceField_T >(forceId_);
BoundaryHandling_T * boundaryHandling = block->getData< BoundaryHandling_T >( boundaryHandlingId_ );
WALBERLA_ASSERT_GREATER_EQUAL( stress->nrOfGhostLayers(), 1);
WALBERLA_FOR_ALL_CELLS_XYZ(force, {
Cell cell(x, y, z);
uint_t k = 0;
Vector3<real_t> f = Vector3<real_t>(0.0);
// calculate force from finite difference divergence of extra stress in 3d or 2d
if (boundaryHandling->isDomain(cell)) {
for (auto d = LatticeModel_T::Stencil::beginNoCenter(); d.direction() != NW; ++d) {
for (uint_t i = 0; i < LatticeModel_T::Stencil::D; ++i) {
if (d.direction() == E || d.direction() == W) {
k = 0;
} else if (d.direction() == N || d.direction() == S) {
k = 1;
} else {
k = 2;
}
if (boundaryHandling->isDomain(cell + *d)) {
f[i] += stress->get(cell + *d)(k, i) * real_c(d.c(k));
} else if(boundaryHandling->isDomain(cell - *d)){
f[i] += -stress->get(cell - *d)(k, i) * real_c(d.c(k)) + stress->get(cell)(k, i) * real_c(d.c(k)) * real_c(2.0);
}
}
}
force->get(x, y, z) = f*real_c(0.5);
}
})
}
void operator()() {
for( auto it = blocks_->begin(); it != blocks_->end(); ++it ) {
auto block = it.get();
if (executionCount_ % uint_c(delta_t_) == 0) {
swapStressBuffers(block);
cacheVelocity(block);
}
}
communicateVelocities_();
for( auto it = blocks_->begin(); it != blocks_->end(); ++it ){
auto block = it.get();
if (executionCount_ % uint_c(delta_t_) == 0)
{
calculateStresses(block);
}
}
communicateStress_();
for( auto it = blocks_->begin(); it != blocks_->end(); ++it ){
auto block = it.get();
calculateForces(block);
}
executionCount_++;
}
private:
Blocks_T blocks_;
BlockDataID forceId_, pdfId_, boundaryHandlingId_, stressId_, stressOldId_, velocityId_;
const real_t inv_lambda_p_, eta_p_, delta_t_;
uint_t executionCount_;
blockforest::communication::UniformBufferedScheme< typename LatticeModel_T::CommunicationStencil > communicateStress_, communicateVelocities_;
bool compressibleFlag_;
};
} // namespace viscoelastic
} // namespace lbm
} // namespace walberla
tests/lbm/CMakeLists.txt
View file @ 0a27a955
......@@ -67,10 +67,6 @@ waLBerla_execute_test( NAME PermeabilityTest_TRT_64_8 COMMAND $<TARGET_FILE:Perm
waLBerla_compile_test( FILES initializer/PdfFieldInitializerTest.cpp )
waLBerla_execute_test( NAME PdfFieldInitializerTest COMMAND $<TARGET_FILE:PdfFieldInitializerTest> ${CMAKE_CURRENT_SOURCE_DIR}/PdfFieldInitializerTest.prm PROCESSES 4 CONFIGURATIONS Release RelWithDbgInfo )
waLBerla_compile_test( FILES SuViscoelasticityTest.cpp DEPENDS field blockforest timeloop)
waLBerla_execute_test( NAME SuViscoelasticityLongTest COMMAND $<TARGET_FILE:SuViscoelasticityTest> ${CMAKE_CURRENT_SOURCE_DIR}/Su.prm LABELS longrun)
waLBerla_execute_test( NAME SuViscoelasticityShortTest COMMAND $<TARGET_FILE:SuViscoelasticityTest> ${CMAKE_CURRENT_SOURCE_DIR}/Su.prm -Parameters.shortrun=true )
waLBerla_compile_test( FILES field/QCriterionTest.cpp DEPENDS field blockforest )
waLBerla_execute_test( NAME QCriterionTest )
......
tests/lbm/Su.prm deleted 100644 → 0
View file @ ef946fcf
Parameters
{
eta_s 0.5;
timesteps 3000;
force 0.00001;
lambda_p 300.0;
eta_p 0.5;
period 1;
L 11;
H 33;
blockSize 11;
uMax 1.28737;
t0 370;
t1 326;
shortrun false;
}
DomainSetup
{
blocks < 1,3,1 >;
cartesianSetup false;
cellsPerBlock < 11,11, 1 >;
periodic < 1, 0, 0 >;
}
tests/lbm/SuViscoelasticityTest.cpp deleted 100644 → 0
View file @ ef946fcf
//======================================================================================================================
//
// 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 SuViscoelasticityTest.cpp
//! \ingroup lbm
//! \author Cameron Stewart <cstewart@icp.uni-stuttgart.de>
//! \brief D2Q9 Poiseuille flow simulation with Oldroyd-B viscoelasticity - Checks against analytical formula and
//! reference data
//
//
//======================================================================================================================
#include "blockforest/Initialization.h"
#include "blockforest/communication/UniformBufferedScheme.h"
#include "boundary/BoundaryHandling.h"
#include "core/Environment.h"
#include "core/SharedFunctor.h"
#include "domain_decomposition/SharedSweep.h"
#include "field/communication/PackInfo.h"
#include "lbm/boundary/all.h"
#include "lbm/field/AddToStorage.h"
#include "lbm/lattice_model/D2Q9.h"
#include "lbm/lattice_model/ForceModel.h"
#include "lbm/SuViscoelasticity.h"
#include "lbm/sweeps/CellwiseSweep.h"
#include "timeloop/SweepTimeloop.h"
namespace walberla {
//////////////
// TYPEDEFS //
//////////////
typedef GhostLayerField< Vector3<real_t>, 1> ForceField_T;
typedef lbm::collision_model::TRT CollisionModel_T;
typedef lbm::force_model::GuoField< ForceField_T > ForceModel_T;
typedef lbm::D2Q9< CollisionModel_T, false, ForceModel_T > LatticeModel_T;
typedef LatticeModel_T::Stencil Stencil_T;
typedef GhostLayerField<Matrix3<real_t>, 1> StressField_T;
typedef GhostLayerField< Vector3<real_t>, 1> VelocityField_T;
typedef lbm::PdfField< LatticeModel_T > PdfField_T;
typedef walberla::uint8_t flag_t;
typedef FlagField< flag_t > FlagField_T;
const uint_t FieldGhostLayers = 2;
typedef lbm::NoSlip< LatticeModel_T, flag_t> NoSlip_T;
typedef BoundaryHandling< FlagField_T, Stencil_T, NoSlip_T> BoundaryHandling_T;
///////////
// FLAGS //
///////////
const FlagUID Fluid_Flag( "fluid" );
const FlagUID NoSlip_Flag( "no slip" );
/////////////////////////////////////
// BOUNDARY HANDLING CUSTOMIZATION //
/////////////////////////////////////
class MyBoundaryHandling
{
public:
MyBoundaryHandling( const BlockDataID & flagFieldID, const BlockDataID & pdfFieldID ) : flagFieldID_( flagFieldID ), pdfFieldID_( pdfFieldID ) {}
BoundaryHandling_T * operator()( IBlock* const block, const StructuredBlockStorage* const storage ) const;
private:
const BlockDataID flagFieldID_;
const BlockDataID pdfFieldID_;
}; // class MyBoundaryHandling
BoundaryHandling_T * MyBoundaryHandling::operator()( IBlock * const block, const StructuredBlockStorage * const storage ) const
{
WALBERLA_ASSERT_NOT_NULLPTR( block );
WALBERLA_ASSERT_NOT_NULLPTR( storage );
FlagField_T * flagField = block->getData< FlagField_T >( flagFieldID_ );
PdfField_T * pdfField = block->getData< PdfField_T > ( pdfFieldID_ );
const auto fluid = flagField->flagExists( Fluid_Flag ) ? flagField->getFlag( Fluid_Flag ) : flagField->registerFlag( Fluid_Flag );
BoundaryHandling_T * handling = new BoundaryHandling_T( "moving obstacle boundary handling", flagField, fluid,
NoSlip_T( "NoSlip", NoSlip_Flag, pdfField ) );
const auto noSlip = flagField->getFlag(NoSlip_Flag);
CellInterval domainBB = storage->getDomainCellBB();
domainBB.xMin() -= cell_idx_c( 1 );
domainBB.xMax() += cell_idx_c( 1 );
domainBB.yMin() -= cell_idx_c( 1 );
domainBB.yMax() += cell_idx_c( 1 );
// SOUTH
CellInterval south( domainBB.xMin(), domainBB.yMin(), domainBB.zMin(), domainBB.xMax(), domainBB.yMin(), domainBB.zMax() );
storage->transformGlobalToBlockLocalCellInterval( south, *block );
handling->forceBoundary( noSlip, south );
// NORTH
CellInterval north( domainBB.xMin(), domainBB.yMax(), domainBB.zMin(), domainBB.xMax(), domainBB.yMax(), domainBB.zMax() );
storage->transformGlobalToBlockLocalCellInterval( north, *block );
handling->forceBoundary( noSlip, north );
handling->fillWithDomain( FieldGhostLayers );
return handling;
}
//////////////////////
// Poiseuille Force //
//////////////////////
template < typename BoundaryHandling_T >
class ConstantForce
{
public:
ConstantForce( BlockDataID forceFieldId, BlockDataID boundaryHandlingId, real_t force)
: forceFieldId_( forceFieldId ), boundaryHandlingId_(boundaryHandlingId), force_(force)
{}
void operator()( IBlock * block )
{
ForceField_T *forceField = block->getData< ForceField_T >(forceFieldId_);
BoundaryHandling_T *boundaryHandling = block->getData< BoundaryHandling_T >( boundaryHandlingId_ );
WALBERLA_FOR_ALL_CELLS_XYZ(forceField,
{
Cell cell(x,y,z);
if (boundaryHandling->isDomain(cell)) {
forceField->get(cell)[0] += force_;
}
})
}
private:
BlockDataID forceFieldId_, boundaryHandlingId_;
real_t force_;
};
////////////////////
// Take Test Data //
////////////////////
class TestData
{
public:
TestData(Timeloop & timeloop, shared_ptr< StructuredBlockForest > blocks, BlockDataID pdfFieldId, BlockDataID stressFieldId, uint_t timesteps, uint_t blockSize, real_t L, real_t H, real_t uExpected)
: timeloop_(timeloop), blocks_(blocks), pdfFieldId_(pdfFieldId), stressFieldId_(stressFieldId), timesteps_(timesteps), blockSize_(blockSize), t0_(0), t1_(0), L_(L), H_(H), uMax_(0.0), uPrev_(0.0),
uExpected_(uExpected), uSteady_(0.0) {}
void operator()() {
for (auto blockIt = blocks_->begin(); blockIt != blocks_->end(); ++blockIt) {
PdfField_T *pdf = blockIt.get()->getData<PdfField_T>(pdfFieldId_);
if (blockIt.get()->getAABB().contains(float_c(L_/2.0), float_c(H_/2.0), 0)) {
uCurr_ = pdf->getVelocity(int32_c(blockSize_/2), int32_c(blockSize_/2), 0)[0]/uExpected_;
tCurr_ = timeloop_.getCurrentTimeStep();
if (tCurr_ == timesteps_ - 1){
uSteady_ = uCurr_;
}
if (maxFlag_ == 0) {
if (uCurr_ >= uPrev_) {
uMax_ = uCurr_;
} else {
t0_ = tCurr_;
maxFlag_ = 1;
}
uPrev_ = uCurr_;
}
else if (maxFlag_ == 1) {
if ((uCurr_ - 1.0) <= (uMax_ - 1.0) / std::exp(1)) {
t1_ = tCurr_ - t0_;
maxFlag_ = 2;
}
}
}
}
}
real_t getUSteady(){
return uSteady_;
}
real_t getUMax(){
return uMax_;
}
real_t getT0(){
return real_c(t0_);
}
real_t getT1(){
return real_c(t1_);
}
private:
Timeloop & timeloop_;
shared_ptr< StructuredBlockForest > blocks_;
BlockDataID pdfFieldId_, stressFieldId_;
uint_t timesteps_, blockSize_, t0_, t1_, tCurr_;
uint_t maxFlag_ = 0;
real_t L_, H_, uMax_, uPrev_, uCurr_, uExpected_, uSteady_;
};
} // namespace walberla
//////////
// Main //
//////////
int main(int argc, char ** argv ){
using namespace walberla;
Environment env( argc, argv );
// read parameter
shared_ptr<StructuredBlockForest> blocks = blockforest::createUniformBlockGridFromConfig( env.config() );
auto parameters = env.config()->getOneBlock( "Parameters" );
// extract some constants from the parameters
const real_t eta_s = parameters.getParameter< real_t > ("eta_s");
const real_t force = parameters.getParameter< real_t > ("force");
const real_t eta_p = parameters.getParameter< real_t > ("eta_p");
const real_t lambda_p = parameters.getParameter< real_t > ("lambda_p");
const uint_t period = parameters.getParameter< uint_t > ("period");
const real_t L = parameters.getParameter< real_t > ("L");
const real_t H = parameters.getParameter< real_t > ("H");
const uint_t blockSize = parameters.getParameter< uint_t > ("blockSize");
const bool shortrun = parameters.getParameter< bool > ("shortrun");
const uint_t timesteps = shortrun ? uint_t(2) : parameters.getParameter< uint_t > ("timesteps");
// reference data
const real_t uExpected = force*H*H/(real_c(8.0)*(eta_s + eta_p));
const real_t uMax = parameters.getParameter< real_t > ("uMax");
const real_t t0 = parameters.getParameter< real_t > ("t0");
const real_t t1 = parameters.getParameter< real_t > ("t1");
// create fields
BlockDataID flagFieldId = field::addFlagFieldToStorage< FlagField_T >(blocks, "flag field", FieldGhostLayers);
BlockDataID forceFieldId = field::addToStorage<ForceField_T>( blocks, "Force Field", Vector3<real_t>(0.0), field::zyxf, FieldGhostLayers);
LatticeModel_T latticeModel = LatticeModel_T(lbm::collision_model::TRT::constructWithMagicNumber( walberla::lbm::collision_model::omegaFromViscosity(eta_s)), lbm::force_model::GuoField<ForceField_T>( forceFieldId ) );
BlockDataID pdfFieldId = lbm::addPdfFieldToStorage( blocks, "pdf field", latticeModel, Vector3<real_t>(), real_c(1.0), FieldGhostLayers );
BlockDataID stressId = walberla::field::addToStorage<StressField_T>( blocks, "Stress Field", Matrix3<real_t>(0.0), field::zyxf, FieldGhostLayers);
BlockDataID stressOldId = walberla::field::addToStorage<StressField_T>( blocks, "Old Stress Field", Matrix3<real_t>(0.0), field::zyxf, FieldGhostLayers);
BlockDataID velocityId = walberla::field::addToStorage<VelocityField_T> (blocks, "Velocity Field", Vector3<real_t>(0.0), field::zyxf, FieldGhostLayers);
// add boundary handling
BlockDataID boundaryHandlingId = blocks->addStructuredBlockData< BoundaryHandling_T >( MyBoundaryHandling( flagFieldId, pdfFieldId ), "boundary handling" );
// create time loop
SweepTimeloop timeloop( blocks->getBlockStorage(), timesteps );
// create communication for PdfField
blockforest::communication::UniformBufferedScheme< Stencil_T > communication( blocks );
communication.addPackInfo( make_shared< field::communication::PackInfo< PdfField_T > >( pdfFieldId ) );
auto testData = make_shared< TestData >(TestData(timeloop, blocks, pdfFieldId, stressId, timesteps, blockSize, L, H, uExpected));
// structure timeloop