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Inconsistent wall shear stress in CFX

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Old   July 14, 2010, 16:04
Default Inconsistent wall shear stress in CFX
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Can somebody tell me why i cannot get a constant wall shear stress on the ground when i am running an empty computational domain. I am using ANSYS CFX. wall shear stress is equal to rho*(friction velocity)^2 and this shouldnt change significantly downstream for an empty computaional domain.

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