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k-kl-omega and near wall treatment

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Old   September 20, 2013, 05:49
Question k-kl-omega and near wall treatment
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Tamara Annabelle
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I am calculating with the k-kl-w Method (Transition model). The k-kl-w Model has no integrated wall functions resp. near walltreatment.Thus I have to refine the mesh close to the walls. The right side of my model (s. pictures) is at the same time the inlet, then the fluid flows to the top. So I have only a boundary layer on the left side and therefore I only have to refine on that side, if I understood everything right. The student who worked on this model before also refined the right side and so did I... until now. I wanted to see the difference which is actually quite big: The mean Nusselt value is three times bigger and the heat transfer thus about 2,5 times bigger. The first cell height is only 7E-04mm higher and the y+ rose from 0.6 to 1.3.
My questions are now:
1. Do I really have to refine only on the left side?
2. if so, shoud/will I reach the same values as before when refining the entire mesh (and thus ameliorating y+)
3. can I define the hight of the first cell/layer somewhere? At the moment I am "regulating" it through the Bias factor and Sections in x-/y-direction and read out the coordinates of the nodes in x-/y-direction... quite laborious...
Thanks for your answers in advance! I would really apreciate them, because the only one here in the institute who knows such stuff more in detail is ill/on holydays since two weeks...
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