We need to know if we can start openfoam solvers on user-controlled mpi
communicators. In particular, we want to call mpi_init ourselves, do
some communicator splitting, and dedicate a subset of our processors to
doing calculations with openfoam. So instead of letting all MPI calls be
hidden from us, we want to start MPI ourselves and then pass in a
communicator (*not* MPI_COMM_WORLD) to OpenFoam. Can this be done?
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