divergence detected in AMG solver-pressure correction

sivaraja · June 15, 2009, 08:58

Dear friends

I am doing air flowing over a heated aluminium block,Heat conduction also enabled in this analysis.while running the analysis i am getting the following error "detected in AMG solver-pressure correction" after some 1000 iterations.Through some previous suggestions in CFD forum i have reduced the Under relaxation factor of pressure to 0.1 and momentum to 0.5. but still this problem occuring.

May know why this error occuring.How to resolve it...............

Thanks in advance for your kind reply

regards

Siva

sivam · June 18, 2009, 08:45

Though you have reduced the factors much lower,this does not fix the problem you better check with all flow conditions or any other boundary conditions,also see about meshing parameters.

Bocliff · June 18, 2009, 11:55

The AMG solver in FLUENT can diverge if the system of equations becomes non-diagonally dominant. Often what happens is that some property becomes negative; you might want to check your density, viscosity, etc. The fact that it ran 1000 iterations would imply that your mesh is probably not the issue.

Bocliff Sutter
--Don't notice the tiny flea in the other person's hair and overlook the lumbering yak on your own nose.

June 15, 2009, 08:58	divergence detected in AMG solver-pressure correction	#1
sivaraja New Member Join Date: Apr 2009 Posts: 7 Rep Power: 16	Dear friends I am doing air flowing over a heated aluminium block,Heat conduction also enabled in this analysis.while running the analysis i am getting the following error "detected in AMG solver-pressure correction" after some 1000 iterations.Through some previous suggestions in CFD forum i have reduced the Under relaxation factor of pressure to 0.1 and momentum to 0.5. but still this problem occuring. May know why this error occuring.How to resolve it............... Thanks in advance for your kind reply regards Siva

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June 18, 2009, 08:45		#2
sivam Member SIVALINGAM Join Date: May 2009 Location: Kodaikanal,Madurai,India Posts: 31 Rep Power: 16	Though you have reduced the factors much lower,this does not fix the problem you better check with all flow conditions or any other boundary conditions,also see about meshing parameters.

June 18, 2009, 11:55		#3
Bocliff New Member Bocliff Sutter Join Date: Jun 2009 Posts: 9 Rep Power: 16	The AMG solver in FLUENT can diverge if the system of equations becomes non-diagonally dominant. Often what happens is that some property becomes negative; you might want to check your density, viscosity, etc. The fact that it ran 1000 iterations would imply that your mesh is probably not the issue. Bocliff Sutter --Don't notice the tiny flea in the other person's hair and overlook the lumbering yak on your own nose.