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WallShearStress for settlingFoam

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Old   August 28, 2012, 04:25
Default [solved] WallShearStress for settlingFoam
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I did a case with settlingFoam in a special geometry; water is flowing into a hemisphere as well as sand.

Now i would like to calculate the bed shear stress at this hemisphere, but the function wallshearstress only uses nu from the singlephase transport model.

What do I have to change in the file wallshearstress.C or createFields.H to obtain this wall shear stress in postprocessing mode?

I can also do the calculation myself with

tau = mu * dU/dy

Only how do I calculate this gradU normal to this hemisphere does wallgradU does this automatically or do I have to add a normal vector but how to do this?

Last edited by Elise; August 28, 2012 at 08:27.
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Old   August 28, 2012, 05:50
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I changed the wallGradU.C file to

wallGradU.boundaryField()[patchi]= - U.boundaryField()[patchi].snGrad*patch().nf();

Is this the correct way to do this or does the wallgradU allready gives the values related to the wall instead of to the
defined axes?

Answere was in Compute shear stress interFoam

Last edited by Elise; August 28, 2012 at 08:26.
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