Defined Wall Shear Stress Boundary Condition
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
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!
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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