|March 30, 2011, 08:22||
Defined Wall Shear Stress Boundary Condition
Join Date: Jan 2011
Posts: 4Rep Power: 6
I want to implement a boundary condition, where I can define the shear stress at a wall. First I tried to adopt the mutWallFunction for my purpose and modified it to calculate the turbulent viscosity as follows
mut = tauWall / gradU - mu
Unfortunately this only works well for coarse meshes. In other cases the velocity gradient becomes to large and the turbulent viscosity gets negative.
Is there a better way to implement such a boundary condition?
Thanks for your help!
|April 14, 2011, 12:44||
Eugene de Villiers
Join Date: Mar 2009
Posts: 725Rep Power: 12
You could create a specific wall boundary condition for U that overrides the snGrad fvPatchField function so as to provide a wall velocity gradient equal to: gradU = tauw / nutw
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