Do not add empty entries to sendProcessNeighbors (MultiGPU)

There are some setups with grid refinement where some communication relationships do not communicate at all refinement levels.

Example below: The communication of the periodic boundary condition is limited to the coarse level.

These configurations did not work prior to this merge request.

Details:

Empty entries in sendProcessNeighbors caused errors in the MPI communication. This is fixed now: When the numberOfSendIndices is zero, no entry is added to sendProcessNeighbors. The changes were made in src/gpu/VirtualFluids_GPU/DataStructureInitializer/GridReaderGenerator/GridGenerator.cpp.

@m.schoenherr @HenrikAsmuth

Closes #46 (closed)

assigned to @a.wellmann

changed title from Draft: Do not add empty entries to sendProcessNeighbors to Draft: Do not add empty entries to sendProcessNeighbors (MultiGPU)

added Bug gpu labels

approved this merge request

marked this merge request as ready

mentioned in commit 2bccce91

merged

mentioned in merge request !161 (merged)

changed the description

changed milestone to %Publication of VirtualFluids 0.1

changed the description

Closes https://git.rz.tu-bs.de/irmb/VirtualFluids_dev/-/issues/47