A Multiple Reference Frame model divides the domain into zones, each solved in its own frame of reference. The zone containing the impeller rotates, while the volute and the ducts stay fixed, and the interface between them passes the flow from one frame to the other.
Nothing physically moves. Inside the rotating zone Fluent adds the centrifugal and Coriolis terms to the momentum equations, which reproduces the effect of the rotation on a steady solution. That is why an MRF run converges in a fraction of the time a transient sliding mesh needs.
The approximation holds while the interaction between the rotating and the fixed parts is weak, which is the normal situation for a blower away from its surge region. When you need the blade passing frequency or the unsteady loads, mesh motion replaces it.
In this tutorial you will learn to simulate a Blower using Ansys Fluent. You can download the geometry from this link.
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