I have a problem with different mass flow across interface in CFX-5.7.1.

1) By default, pitch ratio is computed as simply the area ratio of side 1 and side 2.

2) This means that by default the side1/side2 area should only differ in the 'theta" direction and never in the radial or axial direction (otherwise the wrong pitch is computed).

3) If it is not easy to generate the meshes such that the area ratio is the pitch ratio, then you can still set the case up to work properly by setting the pitch ratio manually. This is right in the GUI. Either set the true pitch ratio (one number is entered, code automatically sorts out the polarity ie. with ratio can be either smaller or bigger than unity) or you can manually give the pitch angle for each side of the interface. Both methods will work correctly for your case.

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