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Divergence in AMG solver: species-4

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Old   July 13, 2006, 09:58
Default Divergence in AMG solver: species-4
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BillChen
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I'm currently simulating gas species reactions inside a chemical vapour deposition chamber. Some of the reactions I have modelled diverges. All the material properties I defined are based on ideal gas law and kinetic theory. The rate laws are not Arrhenius relation, so I have defined UDF for the reaction rates. The problem I have is that, whenever I run the simulation, the console shows me warning message about mass diffusivity being zero, and for several seconds, the simulation crashes with a divergence error. I have tried everything including decrease the reaction rate law by 1000000 times, only then the simulation converges, but that's not right. I would hope that someone know to solve or at least has seen this problem before could help me figure out what's wrong!
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Old   July 15, 2006, 01:14
Default Re: Divergence in AMG solver: species-4
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sree_rahul
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hi..chen

i faced the similar problem" divergence in AMG solver: species 2" when i am running methane-air combustion problem. since i didn't write any udf i simply changed relaxation parameter from 1 to 0.8 or 0.7 for that corresponding species 2.. it worked... i think your problem is much more complex than this .. try once like this..good luck.
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