Rapid Divergence

January 29, 2001, 22:26

I am a starting user of FLUENT. Now when I start iteration, there are always 'Rapid divergence detected..' I cannot understand this because I just changed inlet mole fraction of 4 gases. It never occurred before. So is there any body who has good idea? Please help me.

January 31, 2001, 14:08

Check if your residuals are scaled or not in the solve - monitor - residuals menu. If they aren't scaled that explain your error message.

If they are scaled, try to lower your underelaxation factor for mass fraction and continuity/velocities.

Best regards

January 29, 2001, 22:26	Rapid Divergence	#1
Hojin OH Guest Posts: n/a	I am a starting user of FLUENT. Now when I start iteration, there are always 'Rapid divergence detected..' I cannot understand this because I just changed inlet mole fraction of 4 gases. It never occurred before. So is there any body who has good idea? Please help me.

January 31, 2001, 14:08	Re: Rapid Divergence	#2
alain Guest Posts: n/a	Check if your residuals are scaled or not in the solve - monitor - residuals menu. If they aren't scaled that explain your error message. If they are scaled, try to lower your underelaxation factor for mass fraction and continuity/velocities. Best regards

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