Mike Rife
Ansys Employee

Hi @ahmed.desoki

Ok this is expected.  Please see the MAPDL Parallel Processing Guide, chapter 4.1 table 4.2 that lists the supported MPI types.  For MS Windows based computers, and this version of WB Mechanical with the MAPDL solver, only MS MPI and Win Server OS supports distributed parallel solve across multiple compute nodes.  Using the Microsoft HPC job scheduler (freely available).