What is FLUENT's RANS filter?

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 May 14, 2010, 11:03 What is FLUENT's RANS filter? #1 Senior Member   Jouke de Baar Join Date: Oct 2009 Posts: 125 Rep Power: 8 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!

 May 14, 2010, 13:04 #2 Senior Member   Chris Join Date: Jul 2009 Location: Ohio, USA Posts: 169 Rep Power: 8 "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.

 May 14, 2010, 15:53 #3 Senior Member   Jouke de Baar Join Date: Oct 2009 Posts: 125 Rep Power: 8 Thank you very much!

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