Before beginning the problem setup in
FLUENT, be sure that the grid you have created meets the following requirements:
A different cell zone exists for each portion of the domain that is sliding at a different speed.
The grid interface must be situated such that there is no motion normal to it.
The grid interface can be any shape (including a non-planar surface, in 3D), provided that the two interface boundaries are based on the same geometry. If there are sharp features in the mesh (e.g., 90-degree angles), it is especially important that both sides of the interface closely follow that feature.
If you create a single grid with multiple cell zones, you must be sure that each cell zone has a distinct face zone on the sliding boundary. The face zones for two adjacent cell zones will have the same position and shape, but one will correspond to one cell zone and one to the other. (Note that it is also possible to create a separate grid file for each of the cell zones, and then merge them as described in Section
If you are modeling a rotor/stator geometry using periodicity, the periodic angle of the mesh around the rotor blade(s) must be the same as that of the mesh around the stationary vane(s).
All periodic zones must be correctly oriented (either rotational or translational) before you create the grid interface.
For 3D cases, if the interface is periodic, only one pair of periodic boundaries can neighbor the interface.
11.2.1 for details about these restrictions and general information about how the sliding mesh model works in