# 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:

3. Compute the Wall shear stress:

4. Compute the Friction velocity:

5. Compute the wall distance: