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Wall function calculation of tau_wall

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Old   October 30, 2007, 14:50
Default Wall function calculation of tau_wall
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Does anyone know how wall shear stress is calculated in order to apply the enhanced wall functions??? I know for equilibrium wall functions, you can relate the tke at the center of the wall adjacent cell to tau_wall.

But for the enhanced wall functions, you need to be able to compute tau_wall whether you are in viscous sublayer, buffer region, or log region.

Also, I'm a bit confused as to why the k equation (for the k-omega RANS model) uses a boundary condition of zero flux at the walls. Shouldn't the value of k be zero at the walls?
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