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Combustion problems: solver divergence occurs when turning on high temperature patch

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Old   February 2, 2015, 13:01
Default Combustion problems: solver divergence occurs when turning on high temperature patch
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Nishant
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hello,
Im currently working on unsteady combustion of methane/air mixture with equivalence ratio of 0.75. I used the fluent guide to implement the two step process. my cold flow solution has converged and all ready. But as soon as i patch a region with high temperature and small concentration of products, I get divergence in solver and also a floating point exception. Really need help.
Thank you in advance
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Old   February 4, 2015, 09:58
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Andrea
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Hi,

have you tried to reduce your URFs? Usually i set the one for density at about 0.3

Andrea
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Old   February 8, 2015, 06:20
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Quote:
Originally Posted by nishant View Post
hello,
Im currently working on unsteady combustion of methane/air mixture with equivalence ratio of 0.75. I used the fluent guide to implement the two step process. my cold flow solution has converged and all ready. But as soon as i patch a region with high temperature and small concentration of products, I get divergence in solver and also a floating point exception. Really need help.
Thank you in advance
Hi,
For how much temperature, you are patching?

Sudhir
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