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fluent species transport under relaxation

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Old   March 10, 2011, 06:14
Default fluent species transport under relaxation
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I'm solving a channel flow including species transport equation.
But if I set a under relaxation factor (less than zero(0.9, 0.8, ..)) for a species transport equation, then the speceis mass fraction becomes zero at the channel outlet.

how can I solve this problem?
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Old   March 10, 2011, 08:55
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Check your initial conditions...
your solver is transient? There's any chemical reaction?
If your set the relaxation factor to zero the solution don't advance...
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