is nut wall function in SRFSimpleFoam mixer tutorial actually using Urel?
All, I'm looking at SRFSimpleFoam mixer tutorial and I have o doubt about nut boundary condition. It specifies the entry "U Urel;". Changing it to something stupid like "U blablabla;" it still runs fine. I then changed to nutUSpaldingWallFunction that for sure uses the velocity field and still got the same behaviour. I'm not a programmer expert so i'm not sure what velocity field is the nut wall function actually using. Anyone can help please?