Release 11.0 Documentation for ANSYS Workbench
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Strict rules regarding the location and topology of faces in the Periodic Pair are enforced. For a valid Periodic Pair, the following must be true:
Each face in the Location 1 face list must map to an equivalent face in the Location 2 face list under either a rotation or translation.
The mapping must be the same for each pair of faces.
Each vertex on each face in Location 1 must map to an equivalent vertex on the equivalent face in Location 2 under the same mapping.
Multiple faces can be selected for each of Location 1 and Location 2, provided each face in the Location 1 face list maps onto a face in the Location 2 face list using the specified transformation.
Both the topology and location of the faces is checked to ensure that they are valid through the transformation specified in the Details View. The transformation or Periodic Type can either be Translation by a fixed vector or Rotation.
If it is not possible to conform to these rules for your geometry, then you should create standard Composite 2D Regions for the periodic faces (one for each half of the periodic pair). You will then be able to make a periodic boundary using these faces when setting up your CFD simulation, but the mesh will not be identical between the faces, which will reduce the accuracy of the ANSYS CFX solver on these boundaries.