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Calculate Wall Shear Stress on Cylinder?

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Old   June 30, 2014, 11:23
Default Calculate Wall Shear Stress on Cylinder?
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Hi guys,

i really need help calculating the wall shear stress component on a cylinder.
x=y=1 m diameter

First I transformed coordinates in cylindrical ones with

Now my normal component to surface is
Tangential Component:

For tau_w I defined:

If I compare the results to openFoam i got different numbers, what am I doing wrong?
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