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Old   November 1, 2002, 22:04
Default Advice for convergence problem
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David
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Hi, everybody. I am simulating a gas/liquid two-phase multicomponents flow with reactions in liquid phase. After 70 steps, the solver was terminated with overflow errors. Could anybody please give me some advice how to get a converged solution? Many thanks.

David
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Old   November 1, 2002, 22:56
Default Re: Advice for convergence problem
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Mike
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Need some more details really... If you look at the results before the solver overflows (maybe at the 60th iteration) what do they look like? Is there a particular location where it looks totally unrealistic (maybe you get huge velocities near an inlet?). What's the physics setup (which multiphase models, drag models), what type of flow is it (e.g dispersed gas in a continuous liquid?). Mike
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Old   November 2, 2002, 04:29
Default Re: Advice for convergence problem
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David
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Thanks a lot, Mike. Yes, the flow is a dispersed gas in a continuous liquid in a pipe. The inlet velocity is very slow, about 0.7cm/sec. I use Schiller Naumann Drag model.

Regards David
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Old   November 2, 2002, 14:26
Default Re: Advice for convergence problem
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Mike
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That is slow - what's the Reynolds Number? Could it be Laminar flow but you are applying a turbulence model? Mike
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Old   November 3, 2002, 04:00
Default Re: Advice for convergence problem
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David
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Good suggestion, I'll try. Thanks Mike.

David
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