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March 30, 2011, 09:22 |
Defined Wall Shear Stress Boundary Condition
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#1 |
New Member
Join Date: Jan 2011
Posts: 4
Rep Power: 15 |
Hello everybody,
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 Code:
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! Regards Martin |
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April 14, 2011, 13:44 |
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#2 |
Senior Member
Eugene de Villiers
Join Date: Mar 2009
Posts: 725
Rep Power: 21 |
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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