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Old   August 14, 2018, 00:16
Default transient natural convection water
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Fanourakis Alexander
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Hello everyone,

My project is to study the heat processing of tomato paste. Let me explain. My geometry is a closed domain and includes the retort (full of water) and the can (tinplate-wall and the inside domain). I "patch" the water at 372.15K and, tinplate and tomato paste at 297.15K. After 1 time step the minimum total temeprature is 1K and the maximum 1742K!!!! I see that is very wrong. I would appreciate if you help me. Thanks a lot for your time.
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Old   August 14, 2018, 12:44
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Lucky Tran
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Try doing a few iterations to get a consistent solution before time-stepping.

Instead of:
solve/dual-time-iterate numSteps numIters
solve/iterate numIters
You have to do this manually in the TUI. If you click the calculate button from the GUI, it immediately goes to the next time-step (equivalent to solve/dual-time-iterate)

Regardless of whether or not this fixes your problem you should still get a converged solution at time=0. If it blows up and diverges even before time-stepping, then you know you have a bigger problem and time-stepping is not the issue.
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Old   August 14, 2018, 12:51
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Fanourakis Alexander
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Thank you for your time.
I don think the time step is my problem. :/
I reduced it at 0.01 and I had similar results.
I can not understand why the temperature is so high.
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