[Paraview] wallShearStress Calculation in Paraview

[Ahmet Ahmet]

Hello everyone,

I have results with OpenFOAM including p,T,U outputs. Due to some reasons,
I can't use wallShearStress or wallgradU utility in OF. So, I have to
calculate it on Paraview. I saw many topics related to that on google, but
I could not find a satisfactory answer. My case is 3-D, compressible and
laminar but we can think about incompressible and may be 2-D.

I think the most important part for WSS is to calculate velocity gradient.
My unsolved problem is to calculate that. How can I calculate gradients on
the wall? I have no-slip wall, that is u=0 and with *Gradient of
Unstructured DataSet/Compute Derivatives *filters, I obtained 0 on the
wall. I think the values in the nearest mesh to the wall should be
accounted for. To do that, what should I do?

*Note:*

   1. The walls are not aligned with a coordinate axis. For this part, I
   tried to extract the wall surface and generate normal vectors.
   2. As an alternative to get directly on wall, I tried to get slice a
   little bit over the wall surface and then take surface vector on slice then
   gradient of unstructured dataset on surface vector. That gives me a result
   but I am not sure it's true.


This may be simple for you, sorry for that.
Thank you in advance,
Ahmet
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