[jd95]

Hello,

I am currently conducting a Fluent CFD on an autoclave oven with tools inside.

Using:
-k-e realizable enhanced wall function
-SIMPLE Scheme
-energy on
-velocity inlet
-pressure outlet

I am monitoring the velocity integral at my outlet ( a rectangular cut) for convergence, and the residuals look pretty good. However I am getting reversed flow with every iteration.
I think the problem may come from imposing the outlet BC. The outlet is over a place of changing geometry (imagine a cylindrical wind-tunnel with a wall in it with a a rectangular outlet) and I cannot do much to change the geometry of the problem.
Is there an issue with using a pressure outlet (gauge 0) in this situation? And what would be a more appropriate BC at the outlet?