6.2.1 Geometry/Mesh Requirements

You should be aware of the following geometry setup and mesh construction requirements at the beginning of your problem setup:

• Axisymmetric geometries must be defined such that the axis of rotation is the $x$ axis of the Cartesian coordinates used to define the geometry (Figure  6.2.1).

  Figure 6.2.1: Setup of Axisymmetric Geometries with the $x$ Axis as the Centerline

  

• ANSYS FLUENT allows you to set up periodic boundaries using either conformal or non-conformal periodic zones. For conformal periodic boundaries, the periodic zones must have identical meshes.

  The conformal periodic boundaries can be created in GAMBIT or TGrid when you are generating the volume mesh. See the GAMBIT Modeling Guide or the TGrid User's Guide for more information about creating periodic boundaries in GAMBIT or TGrid.) Alternatively, you can create the conformal periodic boundaries in ANSYS FLUENT using the mesh/modify-zones/make-periodic text command (see Section  6.8.4 for details).

  Although GAMBIT and TGrid can produce true periodic boundaries, most CAD packages do not. If your mesh was created in such a package, set up a non-conformal interface with the periodic boundary condition option enabled in ANSYS FLUENT (see Section  6.8.4 for details).