Friction coefficient along the wall

ParaView Support
1

Hello, I want to calculate the wall friction coefficient. And repeat the following steps, but the result is wrong. Could someone give me more details? The file is attached.
https://www.paraview.org/pipermail/paraview/2016-October/038305.html

2

@ Nicolas Vuaille (Kitware) Sorry to bother you. Could someone help me?

With best regards