[Mahdi_Kh]

Hi everyone,

I have a channel and I would like to see how the shear stress is distributed in the width of the bed of channel. When I use the wallShearStress function, OpenFoam only gives the minimum and maximum values of shear stress on the bed of channel. How can I change this to get local shear stress on all the cells on the bed.

Thank you.

[AtoHM]

As per documentation it should be written by default in OF11: https://github.com/OpenFOAM/OpenFOAM...lShearStress.H



However you can still try with this entry included.

writeFields     true;

For ESI-OpenFOAM this seems to be called

writeToFile     true;

https://www.openfoam.com/documentati...earStress.html


Have you checked there is really no file "wallShearStress" in your result time folder? Additionally you can calculate the field by using the foamPostProcess utility described here at the bottom: https://doc.cfd.direct/openfoam/user...processing-cli

[Mahdi_Kh]

Thank you very much for your reply.

I am using the same function and syntax.

The output I am getting looks like this:

# Wall shear stress
# Time patch min max
16.100183686157614 FP_WALL (-2.6707024603e-04 -4.0433331042e-07 1.1097838880e-09) (-2.6535766862e-06 4.5353077257e-08 5.4673445276e-06)

the three values in parantheses seem to be the three components of shear stress on the specified wall patch, but it only gives me the maximum and minimum values on the wall. I need to know the local shear stress on each cells of the wall patch so that I know how it changes along a line in transverse direction.

[Mahdi_Kh]

But it looks people have been able to get results on nodes like here
determining wall shear stress at selected point

Maybe I should look at the syntaxes again.

[Mahdi_Kh]

Ok I found it. it is actually calculated for all cells and included along with other variables in output folder.

Thanks again for your help.