I think the problem is in your MPI installation. deal.II does not find your MPI
(i.e., it does not find MPI, even if you specifiy -DEAL_II_WITH_MPI=ON).
You could set your cxx compiler to the mpi compiler that was used to build
PETSc. This should be sufficient to make sure deal.II picks up mpi,
Dear developers of Deal ii,
I tried to run example-70(FSI example), but I found I have no
PETSc linked to DEAL ii. I failed since example-17. I have installed PETSc
3.13.2.0 following the instruction of https://ibamr.github.io/linux (IBAMR
is an immersed boundary method which also
