Error on AMG divergence

Mark JIN · April 19, 2018, 05:36

Dear Ansys users,

Currently I am doing one solar radiation model in fluent but encountered divergence issue as follow. Can anyone give advice on this? I am completely frustrated as I have tried to refine my meshes, reduce relaxation factors etc following potential solution I found which did not work!!

Await for expert...

iter continuity x-velocity y-velocity z-velocity energy k omega intermit retheta do-intensi time/iter
# Divergence detected in AMG for do-intensity-31: protective actions enabled!
# Divergence detected in AMG for do-intensity-31, temporarily solve with BCGSTAB!

Divergence detected in AMG solver: do-intensity-31
Divergence detected in AMG solver: do-intensity-31
Divergence detected in AMG solver: do-intensity-31
Divergence detected in AMG solver: do-intensity-31
Divergence detected in AMG solver: do-intensity-31
Divergence detected in AMG solver: do-intensity-31
Error at host: floating point exception

Error at Node 0: floating point exception

Error at Node 1: floating point exception

Error at Node 2: floating point exception

Error at Node 3: floating point exception

Error at Node 4: floating point exception

Error at Node 5: floating point exception

Error: floating point exception
Error Object: #f

Светлана · April 22, 2018, 20:22

You need to simplify your problem until you find what is causing the issue. Try disabling the solar model and running the simulation without it. Impose a constant heat flux on your boundaries by hand and see whether that works. If it does, then you may wish to modify your solar model settings or provide more details in your question for others to be able to assist.

April 19, 2018, 05:36	Error on AMG divergence	#1
Mark JIN Member JIN WEIGUO Join Date: Sep 2016 Posts: 35 Rep Power: 9	Dear Ansys users, Currently I am doing one solar radiation model in fluent but encountered divergence issue as follow. Can anyone give advice on this? I am completely frustrated as I have tried to refine my meshes, reduce relaxation factors etc following potential solution I found which did not work!! Await for expert... iter continuity x-velocity y-velocity z-velocity energy k omega intermit retheta do-intensi time/iter # Divergence detected in AMG for do-intensity-31: protective actions enabled! # Divergence detected in AMG for do-intensity-31, temporarily solve with BCGSTAB! Divergence detected in AMG solver: do-intensity-31 Divergence detected in AMG solver: do-intensity-31 Divergence detected in AMG solver: do-intensity-31 Divergence detected in AMG solver: do-intensity-31 Divergence detected in AMG solver: do-intensity-31 Divergence detected in AMG solver: do-intensity-31 Error at host: floating point exception Error at Node 0: floating point exception Error at Node 1: floating point exception Error at Node 2: floating point exception Error at Node 3: floating point exception Error at Node 4: floating point exception Error at Node 5: floating point exception Error: floating point exception Error Object: #f Светлана likes this.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
PEMFC model with FLUENT	brahimchoice	FLUENT	22	April 19, 2020 15:44
[ANSYS Meshing] Help with element size	sandri_92	ANSYS Meshing & Geometry	14	November 14, 2018 07:54
Two Phase Flow In Vertical Pipe	stonepreston	FLUENT	2	October 31, 2017 08:35
fluent divergence for no reason	sufjanst	FLUENT	2	March 23, 2016 16:08
Divergence problem	Smaras	FLUENT	13	February 21, 2013 05:03

April 22, 2018, 20:22		#2
Светлана Senior Member Svetlana Tkachenko Join Date: Oct 2013 Location: Australia, Sydney Posts: 407 Rep Power: 14	You need to simplify your problem until you find what is causing the issue. Try disabling the solar model and running the simulation without it. Impose a constant heat flux on your boundaries by hand and see whether that works. If it does, then you may wish to modify your solar model settings or provide more details in your question for others to be able to assist.