Calculate mass flow in Paraview

That seems reasonable, thanks @1318980!

I tried both the “surface vector” and the “surface normal”-filters and got exactly the same result when I integrated. However, I notice that it was difference in to coloring of the surfaces. The reason behind this seems to be that the “generate surface normals”- filter didn’t really generate vectors perpendicular to the plane. Why could this be?

Surface vectors, color plot

Surface vectors, glyphs. Notice that the vectors are perfectly perpendicular to the plane

Surface normals, color plot The coloring outside the circle is a little bit brighter than the surface vector-plot


Surface normals, glyphs. Here you can se that the vectors seems severely tilted. Why could this be?