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[FAQ]

There was a change in the sign convention of the traveling wave from R18.X to R19.X. If someone set up a case with “inter blade phase angle” IBPA=-30 in R18.X, then the equivalent aerodamping value in R19.X will be calculated with IBPA=+30. Hence, forward traveling modes in R19.X corresponds to backward traveling modes in R18.X and vice versa. This is the relevant text passage of the R19.0 release notes (Part II: ANSYS Fluids Products -> Chapter 2: CFX Release Notes -> 2.3 Incompatibilities), which can be downloaded for reference (http://storage.ansys.com/doclinks/ansys.html?code=RN-190-pdf-ALU-K0a): “For cases involving transient periodic mesh motion via the Periodic Displacement option (see Periodic Displacement in the CFX-Solver Modeling Guide), the default convention for defining the direction of a traveling wave for a positive phase angle (forward) has changed (see Direction of Forward Traveling Wave in the CFX-Solver Modeling Guide). The default convention is controlled by the expert parameter meshdisp phase angle convention. To ignore the convention altogether, set this expert parameter to 0. To use the convention of Release 18.2, set this expert parameter to 2. This expert parameter is described in Physical Models Parameters in the CFX-Solver Modeling Guide.”