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Turbulence model for backwards facing step

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Old   February 26, 2005, 16:56
Default Turbulence model for backwards facing step
  #1
Riaan
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Hello everyone,

I am currently investigating flow separation and re-attachment over a rearwards facing step.

To date, I have been using the S-A 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 K-epsilon 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 !

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Old   February 26, 2005, 17:29
Default Re: Turbulence model for backwards facing step
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Riaan
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Actually guys, thoughts on K-Epsilon with Non-Equilibrium wall functions would be appreciated.
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Old   February 27, 2005, 04:27
Default Re: Turbulence model for backwards facing step
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reis
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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...
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Old   February 27, 2005, 12:02
Default Re: Turbulence model for backwards facing step
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Riaan
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V2F - 4 equation, LES and RANS combined, right?

Am I correct in assuming it will take double the time of the 2-equation models, or will it take more?
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Old   February 27, 2005, 14:58
Default Re: Turbulence model for backwards facing step
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reis
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it is based on rans. accurate tool for seperated flows and will cost slightly larger than a simple k-e model

you can find detailed info and test results and comparisons with k-e at:

http://www.turbulentflow.com/

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