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how to calculate the wall shear stress?

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Old   May 19, 2014, 05:57
Default how to calculate the wall shear stress?
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In my UDF I need to compute the wall shear stress, but I can't find any appropriate instruction.

How can I solve this problem?

Thanks in advance.
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Old   May 19, 2014, 17:38
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May be it can help you?

I calculated WSS via defination - U from cell near the wall and dY=0.5 of cell size in Y direction.
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