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High absolute 'continuity' residual

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Old   May 20, 2013, 03:51
Question High absolute 'continuity' residual
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Zh
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I am doing a simulation about premix combustion in a 2D round plane (calculation domain was shown in attachment), but 'continuity' residual converges unbearably slow, at the beginning of each iteration, absolute 'continuity' residual reaches 1e5 then decrease to 1e-3 (see attachment). The only boundary condition is an adiabatic wall, I don't know why 'continuity' residual behaves like that, perhaps it is due to species formulas? Thanks in advance.

Models:
Energy;
Laminar;
Speices: Species Transport Model + Volumetric Reactions + Laminar Finite-
Rate + chemkin import mechanism (30 species, 50 reactions)

Materials:
ideal gas

Initial Conditions:
700K, 25bar
Attached Images
File Type: jpg CalculationDomain.jpg (58.0 KB, 14 views)
File Type: jpg High fluctuation of continuity.jpg (64.9 KB, 29 views)
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Old   June 11, 2014, 13:54
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Hooman
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Hello,

Could you fix your problem?

Thanks
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Old   June 11, 2014, 21:14
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Quote:
Originally Posted by enayath View Post
Hello,

Could you fix your problem?

Thanks
Hi, enayath
Sorry, I still don't have a solution for that. I just avoided that problem by using a global reaction instead. It would be highly appreciated if someone has any suggestion.
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