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reversed flow in faces on pressure outlet

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Old   June 20, 2012, 14:39
Default reversed flow in faces on pressure outlet
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Hi Dear all,

I'm simulating a case very simple, but I'm having many problems and I'd like to know if there are any person that can help me. The case is the simulation of isothermal diffusion in a diffusion tube (cylindrical), there isn't convection and also there isn't inlet. There are an outlet and I put the boundary condition there as pressure_outlet. But when I run the simulation FLUENT shows the message: reversed flow in 126 faces on pressure outlet 6.Before, I've tried simulate considering the top of the tube as a wall because the concentration of the component analised has to be 0, but despite this message wasn't showed, the results weren't the expected.
Someone has any advice for help me?

Thank you very much!
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