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Correct values for constants k E in wall functions |
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February 21, 2008, 11:33 |
Dear Forum
Wish You all a
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Dear Forum
Wish You all a nice evening I have a very small confusion related to the values used in /constant/turbulenceProperties for the wall functions: wallFunctionCoeffs { kappa kappa [0 0 0 0 0 0 0] 0.4187; E E [0 0 0 0 0 0 0] 9.0 ; } Using these values yPlusLam is calculated. The confusion is for the constant in the law-of-the-wall E. I have found its value E=9.8 (FLUENT uses this value) in various literature sources but at the same time the lecture notes of Prof. Lars Davidson quotes E=9.0 (same as in OpenFOAM). yPlusLam : 10.9677 (for E=9.0) yPlusLam : 11.2269 (for E=9.8) Depending on the value of yPlusLam the High-Re turbulence model switch to the wall function usage. I request the experts to comment on which value to use as it seems to be depending upon wall quality as well.. I thank you for your attention With Best Regards Jaswi |
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