KNOWN ISSUE: Mass flow calculations for GGI interfaces in parallel may be incorrect (Class 3 Error)
If a case with GGI interfaces is run in parallel, then the mass flows on the interface(s) calculated in CFD-Post or by using a quantitative CEL function such as "massFlow()@Interface" in the CFX-Solver may be slightly incorrect.
If a partition boundary intersects the GGI interface, then those element faces on the interface which contain the partition boundary will not always have their contribution to the mass flow calculated correctly.
Where possible, the correct results can be obtained by running the calculation (or the last few timesteps of the calculation) in serial.
The mass flows quoted in the CFX-Solver output file (in the section headed "Boundary Flow and Total Source Term Summary" for the P-Mass equation) are correct for all cases.
ANSYS CFX Release 12.1. A custom executable for ANSYS CFX Release 12.0 is available on request.