Y plus wall distance estimation
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1. Compute the Re number: | 1. Compute the Re number: | ||
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<math>Re = \frac{\rho \cdot U_{freestream} \cdot L_{boundary\,layer}}{\mu}</math> | <math>Re = \frac{\rho \cdot U_{freestream} \cdot L_{boundary\,layer}}{\mu}</math> | ||
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2. Estimate the skin friction using one of the formulas given [[Skin friction coefficient|here]], for example, using the Schlichting skin-friction correlation: | 2. Estimate the skin friction using one of the formulas given [[Skin friction coefficient|here]], for example, using the Schlichting skin-friction correlation: | ||
Latest revision as of 08:21, 13 June 2011
When meshing it is often useful to be able to estimate the wall-distance needed to obtain a certain Y+ value. To estimate this you can do the following:
1. Compute the Re number:
2. Estimate the skin friction using one of the formulas given here, for example, using the Schlichting skin-friction correlation:
![C_f = [ 2 \, log_{10}(Re_x) - 0.65 ] ^{-2.3} \quad \mbox{for} \quad Re_x < 10^9](/W/images/math/c/a/4/ca4dc895c55260e9f9244eb0465141c8.png)
3. Compute the Wall shear stress:
4. Compute the Friction velocity:
5. Compute the wall distance:
