,I don't understand why the speed profile has this tendency. I changed the size of the first boundary layer to y+ = 1, for the moment I'm still at y+ = 8 (I need to reduce it a bit more). Do you think it is maybe because I am on a pressure based solver and not a density based solver (because the velocities are very high and I think we exceed the speed of sound)? The parameters of the solver are below. I would also like to know whatand say.