# Problem with turbulent models

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 January 3, 2009, 09:41 Problem with turbulent models #1 kostas Guest   Posts: n/a Sponsored Links Hi. I have a airfoil and when i solute it with a k-e model (enhanced wall) with y+=0.2-1.3, i take wrong results... When i solute it with spalart-almaras with same y+, i take a good approximation. Why occur this with k-e model? What do must i, for use the k-e model? expect the configuration of y+, must i config other parameters??

 January 3, 2009, 11:54 Re: Problem with turbulent models #2 zongtwi Guest   Posts: n/a If your Y+ values is around 1, you should use the enhance wall treatment with the k-e model. This should improve your results. Hope that helps.

 January 3, 2009, 14:19 Re: Problem with turbulent models #3 igor Guest   Posts: n/a why do you not use k-e model and a mesh with y+ = 20-40?

 January 3, 2009, 16:45 Re: Problem with turbulent models #4 kostas Guest   Posts: n/a So. I solute the airfoil with k-e model and i see after that i have Y plus approximately 0.4-0.5. The results are wrong (the low pressure of up section is at back of section which is wrong because my experiments have the low pressure in front of section.). when i try to use wall functions, must make a big length of first node and again i take the same results... Only, with spalart-allarmas take approximately good results.. Why does not work the k-e model?? Must i look and other parameters for work the k-e model??? Please, help me someone....

 January 4, 2009, 22:47 Re: Problem with turbulent models #5 uabdillah Guest   Posts: n/a I have trouble with my study about flow arround type D cylinder with cutting angle 65 degree with Re=53000. this study using fluent 6.2, i think my meshing is good but still cannot reach intensity 0.2 and length scale 0.01. I hope you can to solve my problem

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