A modal analysis involving cyclic symmetry includes a Cyclic Controls category in the Analysis Settings object that enables you to solve the harmonic index for all values or for a range of values. This category is available if you have defined a Cyclic Region object in the analysis.
Note: Currently for FSI Modal Acoustics Analysis with Cyclic Symmetry:
The Unsymmetric Solver Type (UNSYM) is supported.
Damping is not supported (Fully Damped, DAMPED).
See the MODOPT section of the Mechanical APDL Command Reference for additional information.