I want to compare the wall shear stress calculated directly from Ansys Fluent with the value that I can calculate from ParaView based on the derivative of the velocity vector obtained from the
GradientOfUnstructuredDataSet Filter. I have noticed that the value obtained from Paraview seems 2.5 times lower overall but both follow the same pattern.
I am quite confident on the formulation of the WSS I use and I checked the ouputs of the
GradientOfUnstructuredDataSet Filter. I compared the vorticity obtained from the filter with that computed on Ansys Fluent and I can see that Paraview once again underestimates the results compared to the CFD solver. I’m not an expert on finite elements, but I suppose that this has to do with the way the filter calculates de velocity vector field, any hint of what could I do alternatively would be of great help. I attach an image with the WSS and vorticity values obtained.