Summary

This tutorial has demonstrated the use of the sliding mesh model for analyzing transient rotor-stator interaction in an axial compressor stage. The model utilized the density-based solver in conjunction with the transient, dual-time stepping algorithm to compute the inviscid flow through the compressor stage. The solution was calculated over time until the monitored variables displayed time-periodicity (which required several revolutions of the rotor), after which time-averaged data was collected while running the case for the equivalent of one additional rotor revolution (240 time steps).

The Fast Fourier Transform (FFT) utility in ANSYS FLUENT was employed to determine the time averages from stored monitor data. Although not described in this tutorial, you can further use the FFT utility to examine the frequency content of the transient monitor data (in this case, you would observe peaks corresponding to the passing frequency and higher harmonics of the passing frequency).