meshWave not AD in parallel

[friedenhe]

The Foam::FaceCellWave<Type, TrackingData>::handleProcPatches() function is not differentiated in parallel. This function is used when updating the wall distance. It seems that it has very little impact on the adjoint accuracy. We tried to AD this function; however, it was not successful and got an MPI_waitAll error. See attached file.

FaceCellWave.zip

[friedenhe]

Tried again and got the MPI_Recv error..
FaceCellWave.C.zip

[friedenhe]

We have implemented a meshWaveFrozen approach to circumvent this issue. Basically, the wall distance is computed only once, before the optimization. Then the mesh wall distance will NOT be updated.