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-   -   LowRe wall function in openfoam (http://www.cfd-online.com/Forums/openfoam-solving/122107-lowre-wall-function-openfoam.html)

verma_rahul August 12, 2013 09:59

LowRe wall function in openfoam
 
I am interested in the physics behind the "Low Re wall function" boundary condition implemented in openfoam.

Does anyone know the basis of openfoam low re BC.

Thanks in advance.

Regards,
Rahul Verma

Bernhard August 12, 2013 10:34

Did you look in the source code? According to the header (nutLowReWallFunction) it sets nut to zero, which is what you would expect for Low-Re modelling. I won't call it a wall function though.

verma_rahul August 13, 2013 01:52

I went through the code but i want the mathematical expression behind the code. Is there any document or any link where i can find mathematics and physics behind the low Re wall function BC

Bernhard August 13, 2013 01:58

Quote:

Originally Posted by verma_rahul (Post 445321)
I went through the code but i want the mathematical expression behind the code. Is there any document or any link where i can find mathematics and physics behind the low Re wall function BC

You can see directly from the source code what is going in the wall function.
Code:

43 tmp<scalarField> nutLowReWallFunctionFvPatchScalarField::calcNut() const                                         
 44 { 
 45    return tmp<scalarField>(new scalarField(patch().size(), 0.0));                                               
 46 }

You can easily compare this with the calcNut() member function of other wall function classes.


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