ke or RSM?
i'm simulating turbulent flow over a circular cylinder, then which model is more appropriate? again, standard or nonequilibrium wall function is better for this kind of problem.
any kind of suggestion is sincerely appreciated. 
Re: ke or RSM?
RSM is better than RNG kepsilon + nonequilibrium wall function but I prefer komega model with enhanced wall treatment called Transitional Flows + Shear Flow Corrections. I tested all turbulence models with all available additional options in Fluent 6.1.22 seeking static pressure distribution on cylinder surface (unsteady flow of course)at mean velocity w=832m/s. The turbulence intensity was i=1%, time step about 5e5s to 5e6s, y+=1 for enhanced wall treatment (the best for flows with boundary layer separation)and obtained relative error (for static pressure at the back of cylinder) equals to 2.6%. RSM is also good for example RSM + wall bc + nonequilibrium gives relative error (for w=20m/s) equals to 3.1%. I hope it helps you.

Re: ke or RSM?
thanks for your valuble and detailed reply! it is very helpful of course. by the way, what's the range of ur Re? mine is less than 1e4 right now, but wider is hoped.

Re: ke or RSM?
Hello Kevin, it is very easy to calculate. The diameter of my cylinder equals to 12mm so for air Re=6.57e+3 to 2.63e+4. I checked numerical simulation results by myself in my open wind tunnel of low speeds so you can be sure of value of relative errors quoted in my previous message. If you want more information send me email and I'll try to give you more details concerning flow over cylinder. Best regards

All times are GMT 4. The time now is 14:38. 