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Old   September 8, 2002, 08:56
Default mass convergance
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I am doing the steady state analysis for comprissible flow I have a pboblem of mass convergance I am getting the convergance for all the residual except the mass residual which is fluctuating in between 0.1 to 0.01 continuosly between iteration 300 to 1200 while at 1000 iteration i got the convergance for all other residuals Can anybody help me to resolve this problem.


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Old   September 9, 2002, 00:07
Default Re: mass convergance
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Try to decrease the under-relaxation factors of pressure equation. sometimes it may be lower as 0.01 to get the convergenced solution.
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Old   September 9, 2002, 01:14
Default Re: mass convergance
Lars Ola Liavåg
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And if this doesn't help, It's possible that your geometry provokes an unsteady (oscillating) flow field in spite of the steady BC's. Is it by any chance a wide-angled diffuser....

Lars Ola
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