reversed turbulent flow en face...
 

I want de model turbulent flow in pipe with obstacle boundary conditions are VI=3m/s and P-outlet,when i iterarting i have very large fluctuation in residual screen and this message appearse" revesed turbulent flow in face..." thank's

I have faced same problem recently but the reversed flow was diminished after 1000 iterations ...when I searched obout the reason ...reversed flow represents negative sign for flowing inflow instead of outflow