Divergence detected in AMG solver: ads-0

Patrino · August 25, 2011, 09:04

hello,

i try to simluate a normal supersonic nozzle. everything worked fine before i wanted to improve my y+ value. therefore i increased the mesh size near the wall. if i run it now with the same values, i always get the error

Divergence detected in AMG solver: ads-0
Divergence detected in AMG solver: ads-1
.
.
.
.
Divergence detected in AMG solver: ads-0
Error: floating point exception
Error Object: #f

would be glad if anyone could help me

br

stuart23 · August 25, 2011, 21:48

Hi

Are you using the density based solver? Implicit or Explicit?

What AMG cycles are you running? V, W, F or flexi? Also did you increase the number of levels when you went up a mesh size?

Stu

Patrino · August 26, 2011, 09:28

Hello,

I'm using density based solver implicit. Also using standard V cycles and I didn't improve the levels when i increased the mesh size. I only increased the mesh size near the wall so I get a lower y+ value.

shahid nadeem · April 9, 2014, 11:40

Hello Dear FRiends can you tell me what does level means

jakeme · April 18, 2014, 02:53

how‘s going that error？ hey，brother，i need your help

grv · November 25, 2015, 10:04

hey, i am facing the same problem. have u got the solution with uniform mesh size. before refining mesh near wall. and one more thing it is a problem with axi-symmetric case only. it work fine for planner case.

surajghiwe · May 12, 2022, 04:11

How to check AMG cycle type in fluent and how to change it?

August 25, 2011, 09:04	Divergence detected in AMG solver: ads-0	#1
Patrino New Member Join Date: Nov 2010 Posts: 4 Rep Power: 16	hello, i try to simluate a normal supersonic nozzle. everything worked fine before i wanted to improve my y+ value. therefore i increased the mesh size near the wall. if i run it now with the same values, i always get the error Divergence detected in AMG solver: ads-0 Divergence detected in AMG solver: ads-1 . . . . Divergence detected in AMG solver: ads-0 Error: floating point exception Error Object: #f would be glad if anyone could help me br

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Quarter Burner mesh with periosic condition	SamCanuck	FLUENT	2	August 31, 2011 12:34
ERROR: divergence detected in AMG solver	black mamba	Main CFD Forum	0	April 19, 2010 16:15
divergence detected in AMG solver !!!	yansheng	FLUENT	0	September 27, 2007 12:22
DIVERGENCE detected in AMG solver ENTHALPY	MANOJKUMAR	FLUENT	2	December 25, 2005 10:54
divergence detected in AMG solver:	Shekhar Jain	FLUENT	1	September 18, 2003 10:31

August 25, 2011, 21:48		#2
stuart23 Senior Member Stuart Buckingham Join Date: May 2010 Location: United Kingdom Posts: 267 Rep Power: 26	Hi Are you using the density based solver? Implicit or Explicit? What AMG cycles are you running? V, W, F or flexi? Also did you increase the number of levels when you went up a mesh size? Stu

August 26, 2011, 09:28		#3
Patrino New Member Join Date: Nov 2010 Posts: 4 Rep Power: 16	Hello, I'm using density based solver implicit. Also using standard V cycles and I didn't improve the levels when i increased the mesh size. I only increased the mesh size near the wall so I get a lower y+ value.

April 9, 2014, 11:40		#4
shahid nadeem Member Nazim Join Date: Oct 2013 Posts: 93 Rep Power: 13	Hello Dear FRiends can you tell me what does level means

April 18, 2014, 02:53		#5
jakeme New Member jake sawn Join Date: Apr 2014 Posts: 1 Rep Power: 0	how‘s going that error？ hey，brother，i need your help

November 25, 2015, 10:04		#6
grv New Member GAUTAM Join Date: Nov 2015 Posts: 2 Rep Power: 0	hey, i am facing the same problem. have u got the solution with uniform mesh size. before refining mesh near wall. and one more thing it is a problem with axi-symmetric case only. it work fine for planner case.

May 12, 2022, 04:11		#7
surajghiwe New Member Maharashtra Join Date: Aug 2020 Posts: 4 Rep Power: 6	How to check AMG cycle type in fluent and how to change it?