I am running an unsteady free-surface calculation in CFX 10.0 with Service Pack1. The run works fine on a DUAL Opteron (2 parallel), but crashes on 2-DUAL core procs (4 parallel).
Do you know how I can overcome this problem?

This problem has been seen before, and it is to do with the Metis partitioning, when the partition boundaries are parallel to the free surface.
The workaround would be to partition differently. Try setting the specified direction for partitioning to be in the streamwise direction.

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