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Old   July 17, 2013, 08:24
Default Fluent Mixed Convection Problem
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Dear all,

I am trying to solve the attached problem using Fluent. This problem is very simple; however, I get "reversed flow in 102 faces on outlet 11" -kind problems.

The defined problem is mixed convection problem. Left wall is kept at 20 celcius degrees while right wall is kept at 100 celcius degrees. Inlet velocity is 0.0822 m/s. I define outlet as outflow. I have uniform mesh in my problem and x direction is divided into 60 and y direction is divided into 1000. The length of the channel is 3 cms and the height of the channel is 1000 mm.

Because of these "reversed flow" error, my solution(especially continuity equation) does not converge and this causes my solution not to reach steady-state and fully developed region.

Can you help me to find the error in my problem?

Thank you very much
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Old   May 14, 2014, 16:56
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Maybe, you have forgotten to scale your mesh - default units for FLUENT are meters. And you have mm.
Also it can be a problem with mesh.

Best regards, John.
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Old   May 14, 2014, 23:52
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Ali Jafarizade
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how do you solve the problem?
using steady state solver or transient solver?
is it in laminar region or in turbulence one? i think it is a laminar case. right?
did you check the pressure outlet boundary condition too?
best regard
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convergence in fluent, error, fluent

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