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What is FLUENT's RANS filter?

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Old   May 14, 2010, 11:03
Default What is FLUENT's RANS filter?
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Jouke de Baar
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Hi, I'm a bit confused here. I always thought FLUENT uses a time-average RANS filter. Is this correct? I can understand this for a unsteady solver, but how does this work out for a steady solver?

Tanks!
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Old   May 14, 2010, 13:04
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Chris
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"RANS" means "Reynolds-Averaged Navier-Stokes", and Reynolds-Averaging is a form of time averaging. So if you solve the RANS equations, then you're solving a time-averaged form of the equations.

This time-averaging has nothing to do with the solver you are using. If you use the unsteady solver, then you are marching in time and solving time-accurately. If you use the steady-state solver, then you are still marching in time until you get to steady-state, but not solving time-accurately.
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Old   May 14, 2010, 15:53
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Thank you very much!
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