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Multiple Rotating Reference Frame useful?

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Old   November 7, 2012, 14:01
Default Multiple Rotating Reference Frame useful?
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Hi,
I would like to submit a question to the Fluent users about the Multiple Rotating Reference Frame (MRF).
After reading carefully the Fluent User’s Guide, I still have this question. For a steady-state analysis, what is the difference between the MRF approach and simply setting wall velocities (moving wall) without any rotating reference frame? Does MRF only help for convergence in that case?
Finally, with the MRF approach, should the boundaries of the rotating reference frame be placed far enough from the rotating elements?
Thank you for your help.
Jérémie
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