Posted by Precise Simulation on
URL: http://forum.featool.com/OpenFOAM-can-not-find-Windows-Microsoft-MPI-libraries-tp1120p1127.html

The external solvers OpenFOAM, SU2, and FEniCS all depend on MPI (https://en.wikipedia.org/wiki/Message_Passing_Interface) libraries to enable solving problems in parallel.

The interfaces are typically set-up automatically when installing the external solvers. If they are not you must install MPI libraries, which depends on your operating system (OS).

  https://www.featool.com/doc/openfoam.html#install_of_mpi

With OpenFOAM it is recommended to use the ESI distribution https://www.openfoam.com/download/openfoam-mingw-cross-compilation, which should include MPI libraries. Otherwise, as suggested in the error message Microsoft provides Windows compatible MPI libraries via https://www.microsoft.com/en-us/download/details.aspx?id=100593

You can test if the MPI libraries can be found by running the following commands in Matlab

  if( ispc() )
    [st1,res1] = system('mpiexec /?')
    [st2,res2] = system('mpirun /?"')
  else
    [st1,res1] = system('bash -c "mpiexec -V"')
    [st2,res2] = system('bash -c "mpirun -V"')
  end

if either of "st1" or "st2" return zero (0 = no system call error) MPI libraries could be found.