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-   -   Wall function calculation of tau_wall (http://www.cfd-online.com/Forums/fluent/46456-wall-function-calculation-tau_wall.html)

KRK October 30, 2007 14:50

Wall function calculation of tau_wall
 
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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