Divergence in AMG solver

esi1520 · March 27, 2018, 08:03

Hi friends,

Please help me;

I am trying to simulate combustion and define combustion reaction of CH4 and H2. I use DO radiation model but after some iteration an error occur and diverge solution. The message of divergence appear: "divergence detected in AMG solver: temperature -> increasing relaxation sweeps!"

I dont know how to repair it.

Also how to increase relation sweeps (for temperature!!)?

Thanks,

Kummi · March 27, 2018, 09:01

Hi Esmaeil ,
Have you gone through the following threads.. might help u

Divergence detected in AMG solver: species-2 -> Increasing relaxation sweeps!

# Divergence detected in AMG solver: temperature -> Increasing relaxation sweeps!

esi1520 · March 27, 2018, 13:21

Dear Kummi, thanks for your reply
I change turbulent intensity and turbulent length scale in BCs and reduce them and try again. Fortunately so far fluent is running without problem and that message not appear.
I hope converge solution.

esi1520 · March 31, 2018, 02:59

Quote:

Originally Posted by Kummi

Hi Esmaeil ,
Have you gone through the following threads.. might help u

Divergence detected in AMG solver: species-2 -> Increasing relaxation sweeps!

# Divergence detected in AMG solver: temperature -> Increasing relaxation sweeps!

Dear Kummi, thanks for your reply
I change turbulent intensity and turbulent length scale in BCs and reduce them and try again. Fortunately so far fluent is running without problem and that message not appear.
I hope converge solution.

March 27, 2018, 08:03	Divergence in AMG solver	#1
esi1520 New Member Esmaeil Jabbari Join Date: Dec 2014 Posts: 24 Rep Power: 11	Hi friends, Please help me; I am trying to simulate combustion and define combustion reaction of CH4 and H2. I use DO radiation model but after some iteration an error occur and diverge solution. The message of divergence appear: "divergence detected in AMG solver: temperature -> increasing relaxation sweeps!" I dont know how to repair it. Also how to increase relation sweeps (for temperature!!)? Thanks,

March 27, 2018, 13:21		#3
esi1520 New Member Esmaeil Jabbari Join Date: Dec 2014 Posts: 24 Rep Power: 11	Dear Kummi, thanks for your reply I change turbulent intensity and turbulent length scale in BCs and reduce them and try again. Fortunately so far fluent is running without problem and that message not appear. I hope converge solution. Last edited by esi1520; March 31, 2018 at 02:58.

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March 27, 2018, 09:01		#2
Kummi Senior Member Kumaresh Join Date: Oct 2016 Posts: 348 Rep Power: 11	Hi Esmaeil , Have you gone through the following threads.. might help u Divergence detected in AMG solver: species-2 -> Increasing relaxation sweeps! # Divergence detected in AMG solver: temperature -> Increasing relaxation sweeps!