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-   -   CH4 gas-phase reaction and stiff chemistry solver (http://www.cfd-online.com/Forums/fluent/75091-ch4-gas-phase-reaction-stiff-chemistry-solver.html)

sonosun April 15, 2010 21:01

CH4 gas-phase reaction and stiff chemistry solver
 
Hi,
I am simulating the methane/air combustion in micro-channel using elementary reactions.

I used the seperate solver, and firstly without 'stiff chemistry solver', however the residual curve oscillate in a very large range and can't converge. Then I choose the 'stiff chemistry solver', it showed a good effect, but after about several thousands steps, there would be some errors:'ISAT reaction rate: Temperature = '.

Any sugestions? I just use the 'stiff chemistry solver' as its default values, do anyone know its appliction method or about the methane gas-phase reaction?

Best regards


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