remove allow-run-as-root in MPIEXEC_PREFLAGS it is handled via the environment variables in the docker images
check for intelclang or clang before checking for OpenMP bug

Update Allen Cahn model

See merge request walberla/walberla!473

Fix documentation of directionFromAxis

See merge request walberla/walberla!471

Implement operator*(scalar, matrix) for Matrix2 and Matrix3

See merge request walberla/walberla!470

Use OpenMP include path

See merge request walberla/walberla!469

Revamp LB GPU Benchmark App for In-Place Streaming

See merge request walberla/walberla!463

Basic fluidized bed showcase

See merge request walberla/walberla!468

Added basic fluidized bed showcase, demonstrating the fluid-particle / lbm-mesapd coupling functionalities for an application

Add documentation about writing distance octree on root node only

See merge request walberla/walberla!467

Fix SimpleDiffusionDirichlet

Closes #149

See merge request walberla/walberla!466

Add include guards

Closes #148

See merge request walberla/walberla!461

Change reference to const reference in stringToNum

See merge request walberla/walberla!462

add gcc 11 to CI

See merge request walberla/walberla!456

HashGrids for mesapd

See merge request walberla/walberla!457

Workaround for __BIGGEST_ALIGNMENT__ on Clang

See merge request walberla/walberla!458

On x86_64, this is always 128 bits, rendering it incompatible with AVX.
GCC reports the maximum enabled vector width (which is what we want) and Intel reports the maximum supported vector width (which is okay too).

Fixed possible divide by zero in mesh vtk writer and added case to test

See merge request walberla/walberla!455

Fixed ordering of cmake commands

See merge request walberla/walberla!454