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Too many iterations yield strange results??

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Old   December 13, 2012, 19:21
Default Too many iterations yield strange results??
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I'm a newbie and have some ridiculous problem solving conjugate problem:

Simulating cylindrical combustion chamber (species transport: air+methane) covered with cooling water case(cold water inlet + pressure outlet).

30 iterations -- result is very coarse, but physics is ok
50 iterations (fig. I) -- result looks nice
100 iterations (fig. IV) -- apparently wrong (too low temperature)
200 (fig. V) /300 (fig. VI) -- temperature variation less than 1 degree
1000/1500 -- total mess: no combustion at all, temperature variation less than 1 degree

// Figures attached
Attached Images
File Type: jpg Part1-I-cc.jpg (57.9 KB, 6 views)
File Type: jpg Part1-IV-cc.jpg (57.8 KB, 8 views)
File Type: jpg Part1-V-cc.jpg (48.3 KB, 5 views)
File Type: jpg Part1-VI-cc.jpg (48.8 KB, 6 views)
File Type: jpg Part1-residuals graph.jpg (72.5 KB, 6 views)
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