Turbulence model for backwards facing step
Hello everyone,
I am currently investigating flow separation and reattachment over a rearwards facing step. To date, I have been using the SA turbulence model, because of computational efficiency, and in order to get a 1st order approximation of what I am looking for. My current task is to improve the turbulence model selection. I considered the Kepsilon model, but literature states that it does not accurately simulate the separated region with the reverse flow. Any suggestions? If I go to a Reynolds Averaged or a Large Eddy simulation, I doubt my computer could handle it ! 
Re: Turbulence model for backwards facing step
Actually guys, thoughts on KEpsilon with NonEquilibrium wall functions would be appreciated.

Re: Turbulence model for backwards facing step
you may try v2f model. it can handle this problem better than ke and sa but requires some more comptutational resource than both of them...

Re: Turbulence model for backwards facing step
V2F  4 equation, LES and RANS combined, right?
Am I correct in assuming it will take double the time of the 2equation models, or will it take more? 
Re: Turbulence model for backwards facing step
it is based on rans. accurate tool for seperated flows and will cost slightly larger than a simple ke model
you can find detailed info and test results and comparisons with ke at: http://www.turbulentflow.com/ 
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