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What is the consequence of using a high-Re turbulence model on a low-Re grid |
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April 28, 2017, 08:30 |
What is the consequence of using a high-Re turbulence model on a low-Re grid
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Senior Member
Yuehan
Join Date: Nov 2012
Posts: 142
Rep Power: 13 |
Hi everybody,
We know that the three major variants of the k-epsilon models, the standard k-epsilon, realizable k-epsilon, and RNG k-epsilon model, are all deemed as high-Re models (correct me if I am wrong here). This means that we typically use them on a high-Re mesh, i.e., having y+ = 30 - 120 approximately, together with wall functions. I usually use the following wall functions in OpenFOAM: Code:
k: kqRWallFunction epsilon: epsilonWallFunction nut/mut: nutkWallFunction/mutkWallFunction However, what is the consequence if I use high-Re models on a low-Re mesh, i.e., having y+ = 1 approximately? Does this negatively or positively impact the accuracy of the results? In addition, what types of wall functions (or boundary conditions) should be used when applying high-Re models to low-Re grids? Should I use the following: Code:
k: kLowReWallFucntion epsilon: epsilonLowReWallFunction nut/mut: nutLowReWallFunction/mutLowReWallFunction https://bugs.openfoam.org/view.php?id=1852 So what type of boundary conditions should be used to replace 'epsilonLowReWallFunction'? Thank you. |
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