divergence detected in AMG solver: temperature

January 27, 2007, 15:17

i am simulating an ejector..in the initial part of the iteration..i get messages indicating reserved flow in 3 boundaries that i've set...the iteration stop when error occurs..the error says that divergence has been detected in AMG solver: temperature...can anyone tell me what that's mean...thank you

January 30, 2007, 00:52

try to reduce URF of energy equations, say .9/.8. Use multigrid techniques/settings for initialisation and then start your run... Refer user guide for more details on multigrid settings.

bitak · September 11, 2009, 10:28

Hi.
I work on project about subsonic ejector like you.
My solve is :air - couple - axisymetric - k-e rng - pressure inlet and outlet ideal gas - my presure inlet are 150 ,250 ,350 ,450 Kpa and out let is atmosphere.
unfortunately my solve is divergence!!!!!!!!!
really I need to your help.
I change k-e to k-omega and pressure inlet to mass flow but devegence again.I know i have a shoke and so reverse flow in fluent.

Philipov · September 11, 2009, 10:32

Look at solver options.... V, W.... which parameter is on divergence...

bitak · September 11, 2009, 11:06

temprature become really more!!! or absolute pressure become really less!
after doing some changes in my solve at now iteration is really more (>90000)!!
how I can change my URF?
you think what I do?
my base solve is false?

January 27, 2007, 15:17	divergence detected in AMG solver: temperature	#1
zambroa Guest Posts: n/a	i am simulating an ejector..in the initial part of the iteration..i get messages indicating reserved flow in 3 boundaries that i've set...the iteration stop when error occurs..the error says that divergence has been detected in AMG solver: temperature...can anyone tell me what that's mean...thank you

January 30, 2007, 00:52	Re: divergence detected in AMG solver: temperature	#2
pinks Guest Posts: n/a	try to reduce URF of energy equations, say .9/.8. Use multigrid techniques/settings for initialisation and then start your run... Refer user guide for more details on multigrid settings.

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September 11, 2009, 10:28		#3
bitak Member bitak Join Date: Jul 2009 Posts: 56 Rep Power: 18	Hi. I work on project about subsonic ejector like you. My solve is :air - couple - axisymetric - k-e rng - pressure inlet and outlet ideal gas - my presure inlet are 150 ,250 ,350 ,450 Kpa and out let is atmosphere. unfortunately my solve is divergence!!!!!!!!! really I need to your help. I change k-e to k-omega and pressure inlet to mass flow but devegence again.I know i have a shoke and so reverse flow in fluent.

September 11, 2009, 10:32		#4
Philipov Senior Member Svetlin Filipov Join Date: Mar 2009 Location: United Kingdom Posts: 176 Rep Power: 18	Look at solver options.... V, W.... which parameter is on divergence...

September 11, 2009, 11:06		#5
bitak Member bitak Join Date: Jul 2009 Posts: 56 Rep Power: 18	temprature become really more!!! or absolute pressure become really less! after doing some changes in my solve at now iteration is really more (>90000)!! how I can change my URF? you think what I do? my base solve is false?