What is FLUENT's RANS filter?
 

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!

"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.

Thank you very much!