I’m looking for a way to obtain the force (normal and tangential components) distribution on the surface of an object around which the flow occurs. I haven’t found a way to get such output from OpenFOAM (it seems that only total forces can be obtained this way) so postprocessing in ParaView seems to be the only potential way to achieve this. This video shows how to use the Calculator filter and a few preceding filters to get the normal forces in each global direction from pressure: How to calculate aerodynamic forces with Paraview - YouTube
However, there can be a problem with tangential (shear) forces. I tried using the Generate Surface Tangents filter instead of the Generate Surface Normals one but it shows the error “Texture coordinates are requested to generate tangents”. Do I need some additional data ? I only have standard results from OpenFOAM (a simple test case involving flow around a sphere). Or maybe there’s another approach that could let me achieve the desired goal ?