CFX-Post Bug : Averaging Function
 

In the CFX-Post, the averaging function should not be trusted in any surface cut because of malfunction at some locations where the mesh is not well aligned with the cut direction.

Through a tiresome communication with Ansys support, they accepted my claim to inform that the bug has recently been fixed in R17.0 which is not released yet.

In the inlet-to-outlet chart of a compressor stage, the mass-averaged absolute total temperature fluctuates downstream of the rotor, as shown in the attached file, which should be flat in physics. The small change of total temperature will give you a bigger change of compressor or rotor efficiency calculation.

Please note that do not try to find any averaged value where the mesh lines are not well aligned with your cut. The value is wrong for now !

Does this apply to all the averaging functions - ave, massFlowAve, volumeAve, rmsAve, areaAve?

Hi ghorrocks,
I found the bug from both mass-averaging and area-averaging, but guess all the others you asked would be affected by the wrong interpolation between the cut face and skewed mesh faces. The more mesh lines are deviating from the cut, the more inaccurate value you will get.