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Convergence problem with fluent

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Old   April 1, 2013, 06:07
Exclamation Convergence problem with fluent
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ryu
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Hi every one.
I'm dealing with a Rayleigh-Bénard problem on Fluent. The problem is that the solution refuse to converge even after thousands of iterations here the screen capture of the residuals:

thank for all
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Old   April 1, 2013, 09:44
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The convergence criteria is problem specific. It seems that your solution has already been converged.
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Old   April 2, 2013, 07:53
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Thanks for reply.
Actually I'm dealing with a translational periodic flow with fixed pressure gradient. If you have any tips to judge the accuracy of convergence I will be so grateful.
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Old   April 2, 2013, 08:15
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I really do not remember what my college used to judge convergence when he simulated a similar problem. I think the convergence of mass flow rate might be a good indicator.
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Old   April 3, 2013, 11:43
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Try creating several monitors of properties (pressure/velocity/temperature etc) that are important to your physics. Monitors can be points/surface average monitors etc. If the problem is steady (as it appears) the monitors should be flat.

You can also monitor volume averaged mass imbalance, it should small.

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