I am trying to illustrate backward-step facing flow using air. Flow is steady,laminar and incompressible.The upper boundary and the outlet is pressure_oulet. First, I am using a udf and I cant get parabolic velocity profile in velocity although I am using a parabolic function.Secondly,I obtain an alert like "reversed flow in.." in my all iterations,not for short period. In all iteration that is written, and it doesn't disappear even if I made 5k iterations. What is the problem?
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