The ability to rotate the mesh is analogous to the ability to translate the mesh in FLUENT. You can rotate the mesh about the x, y, or z (for 3D) axis and also specify the rotation origin. This option is useful in the cases where the structural grid and the CFD grid are offset by a small angle.
You can rotate the grid in FLUENT using the Rotate Grid panel (Figure 6.8.12).
Using the Rotate Grid Panel
The procedure for rotating the grid is as follows:
The Domain Extents will be updated to display the new extents of the rotated grid. (Note that the Domain Extents are purely informational; you cannot edit them manually.)