Release 11.0 Documentation for ANSYS Workbench
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Suppose that you are trying to model a geometry which has a very thin feature (for example, a thin sheet of metal in an enclosure). If you mesh such a geometry as a three-dimensional feature, you would have to use a very small mesh edge length on the end of the thin protrusion. In ANSYS CFX, you can model this as a two-dimensional Thin Surface as shown below.
The ANSYS CFX Solver treats each side of the Thin Surface uniquely and computes the flow variables for both sides separately.
The Thin Surface must be the face of a Solid Body, so to set up a Thin Surface in CFX-Mesh, you must have more than one Solid Body present in the model, and this must be a consideration when constructing the geometry. You can also set up a Composite 2D Region which actually forms the Thin Surface boundary condition for the CFD simulation, if you choose.