The following error occurs when launching CFX 14 in parallel:
mpirun_mpid version mismatch
From the ANSYS 14.0 Release Notes:
"CFX Distributed Parallel in ANSYS CFX 13 uses HP-MPI while CFX Distributed Parallel in ANSYS CFX 14 uses PCMPI. These different installations of MPI can have a conflict when installed on the same Windows machine. To avoid such a conflict, be sure to follow the installation instructions that appear during Platform MPI installation. "
The only workaround is to unset or delete MPI_ROOT environment variable. This should allow CFX 13.0 and CFX 14.0 to run independently.
To remove this variable:
Open Control Panel > System > Advanced > Environment Variables.
MPI_ROOT will be in the System Variables. Delete this variable.