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-   -   questions about keps model and wall function (http://www.cfd-online.com/Forums/fluent/34838-questions-about-keps-model-wall-function.html)

sarah_ron October 13, 2004 18:26

questions about keps model and wall function
 
Dear all, If I use the k-eps model in the "viscous/models/..." and select enhance wall treatment in the 'near wall treatement'. Does this combination mean low Re number model? If right, which low-re-model it correspond? Thanks a lot!

sarah

dieter October 14, 2004 06:31

Re: questions about keps model and wall function
 
If your y+<=1 it is low Re solved with a k-l or one-equation model. if your y+>1 the solution is a blending between a low Re and adapted Wall Functions. Try the manuals, its rather complicated to explain in a few words...

sarah_ron October 14, 2004 11:47

Re: questions about keps model and wall function
 
Dear dieter,

Thanks for your reply.

Then if my y+<=1, and just repeat the procedure as follows:

k-eps model: "viscous/models/..."

enhanced wall treatment:'near wall treatement'.

So it means the combination should be a low -Reynolds number model? If so, it corresponds which low-reynolds number model? 0 Abid 1 Lam-Bremhorst 2 Launder-Sharma 3 Yang-Shih 4 Abe-Kondoh-Nagano 5 Chang-Hsieh-Chen

Thanks a lot! sarah

dieter October 15, 2004 08:50

Re: questions about keps model and wall function
 
that I don't know very well. I think Fluent takes his Low-Reynoldsmodifications (damping functions) from several sources... but it is not clearly explained in the manuals.So I can't answer that question properly, sorry for that


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