|November 21, 2014, 08:49||
mesh quality checking for large internal flow (yStar)
Join Date: Feb 2010
Posts: 213Rep Power: 10
Hi foamers, I'm working on a large internal flow case. I'm walking step by step on preliminary models: a simplified geometry, no account for temperature and so on. I've adopted the simpleFoam solver and the model with near-wall treatment. I'd like to check the quality of my mesh, so I'm back to the very old and debated question about y+ and y*. I've been far from OpenFOAM in the last two years, maybe I'm not updated about last changes and enhancements.
1. I set the nutkWallFunction. In the nutkWallFunctionFvPatchScalarField.C file I read
yPlus = Cmu25*y[faceI]*sqrt(k[faceCellI])/nuw[faceI]
2. The yPlusRAS utility outputs the min, max and average y* value on the wall patches.
3. y* is different from y+, but in the inner boundary layer log-law region they are similar and I can use the standard OpenFOAM utility.
4. Anyway, I read from FLUENT Theory Guide that
Patch 12 named domain y+ : min: 22.09039 max: 657.0444 average: 197.6188
Thanks for sharing your experience.
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