KNOWN ISSUE: Wall scale problem in parallel when no non-slip walls (Class 3 Error)
If a case with no non-slip walls is run in parallel, then it may incorrectly solve the wall scale equation, and thus corrupt the overall solution.
This is due to an error in the logic which the CFX Solver uses to decide whether or not to solve the wall scale equation.
If possible, try to find a partitioning structure in which the wall scale equation is not solved.
ANSYS CFX Release 13.0. A custom executable for ANSYS CFX Release 12.1 is available on request.