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Old   October 16, 2010, 10:38
Default Pressure & Air circulation
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Noppawit Sippawit
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I'm a beginner in CFD, please advise me.

I've a container model with a cavity. The air is inside that closed cavity. I set the model to be heated up for more that 100 degree C, solve for transient from 0-15 sec, 0.1 sec is my time step size. The outer surface of the container is radiate to ambient air 300K.

I need the temperature, pressure and velocity of air in the cavity.
For temperature, I've already checked with my adviser and it is reasonable. But for pressure and velocity, the result are not reasonable. Because when I heat it up, pressure should increase, but my result is not increase. And, no air circulation in the cavity. The results are all converged, but I don't understand why FLUENT says "Converge", since some of residual plotted (Velocity) is not below 1e-06.

In this case, how can I set the FLUENT? From what I set, I included gravity, with initial gauge pressure is 1e-10Pa, initial velocity in x,y,z was 1e-10m/s. And I also set the flow to be laminar flow (I've no idea about choosing another turbulent model), and energy equation was set to be on. All Spatial Discretizations were Second order.

In my opinion, the pressure should be increased within the cavity, since the concept is similar to Marcet boiler.

Please help,
Thank you
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