CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLUENT

Error: Divergence detected in AMG solver: x-momentum

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree3Likes

Reply
 
LinkBack Thread Tools Display Modes
Old   September 26, 2013, 05:50
Default
  #21
Member
 
vidyanand
Join Date: Nov 2011
Location: bangalore,india
Posts: 66
Rep Power: 8
Vidyanand Kesti is on a distinguished road
if you rae using FLUENT can you convert to ploy and try may be you can avoiad this
Mesh-ployhydrel-convert domain
or smooth and swap
Vidyanand Kesti is offline   Reply With Quote

Old   September 26, 2013, 09:09
Default
  #22
Member
 
Vjoess
Join Date: Oct 2012
Posts: 52
Rep Power: 4
dinesh is on a distinguished road
Quote:
Originally Posted by ghost82 View Post
You must assign X as the axisymmetric axis.

Daniele
thank-you sir

Is there a method where i can change my Y axis to X axis. So that i dont have to make it again? Even if it is possible in workbench please let me know?
dinesh is offline   Reply With Quote

Old   September 26, 2013, 09:19
Default
  #23
Senior Member
 
ghost82's Avatar
 
Daniele
Join Date: Oct 2010
Location: Italy
Posts: 908
Rep Power: 15
ghost82 will become famous soon enough
Quote:
Originally Posted by dinesh View Post
thank-you sir

Is there a method where i can change my Y axis to X axis. So that i dont have to make it again? Even if it is possible in workbench please let me know?
I think you have to go back to pre processing and rotate/translate geometry+mesh.

Daniele
ghost82 is offline   Reply With Quote

Old   September 29, 2013, 15:29
Default
  #24
Senior Member
 
A CFD free user's Avatar
 
A-A Azarafza
Join Date: Jan 2013
Posts: 187
Rep Power: 4
A CFD free user is on a distinguished road
Quote:
Originally Posted by niloogh View Post
hi Daniele
is taking x axis as axisymmetric needed in 3D too???
Hi Friend
As far as I know, there's no necessity for 3d geometry to define x axis as axisymmetric B.C.
Good luck
__________________
Regard yours
A CFD free user is offline   Reply With Quote

Old   September 30, 2013, 01:06
Default need help
  #25
New Member
 
Andika
Join Date: Mar 2013
Posts: 2
Rep Power: 0
ryujibando is on a distinguished road
Hello my name is aan. Now I'm doing project about combustion zone in secondary reformer of ammonia plant. Can anyone check mesh generated in my project? I really appreciate if there is someone who would like to discuss with me.

Best regards,

AAN
ryujibando is offline   Reply With Quote

Old   March 28, 2014, 11:04
Default
  #26
New Member
 
samir
Join Date: Sep 2011
Location: Algeria
Posts: 11
Rep Power: 5
samir_cfd is on a distinguished road
Send a message via MSN to samir_cfd Send a message via Skype™ to samir_cfd
Good day
I have a problem when I am simulate unsteady flow around a propeller, divergence detected in amg solver. x momentum, I reduce the URF but is the same problem
samir_cfd is offline   Reply With Quote

Old   March 29, 2014, 12:33
Default
  #27
New Member
 
Nick Prendergast
Join Date: Dec 2013
Posts: 27
Rep Power: 3
neprendo is on a distinguished road
Its probably an issue with your boundary conditions and/or mesh then. Double check your BCs, refine your mesh and put the URFs back to the defaults. The default URFs with make your solution converge quicker.

Nick
neprendo is offline   Reply With Quote

Old   March 30, 2014, 22:15
Default
  #28
New Member
 
Abhijith Mohan
Join Date: Mar 2014
Posts: 12
Rep Power: 3
abhijithmohan is on a distinguished road
try changing the mesh and relaxation factor
abhijithmohan is offline   Reply With Quote

Old   April 9, 2014, 03:44
Default
  #29
New Member
 
Join Date: Jan 2012
Posts: 3
Rep Power: 5
chrischensong is on a distinguished road
Quote:
Originally Posted by niloogh View Post
hi dear
my problem was related to the periodic boundaries.after changing some things in gambit ;i had solved my problem.if your problem has periodic boundaries i,ll explan it in details for you.
Hi niloogh,

I got a similar problem now. I added a udf velocity profile at the inlet of a pipe and the domain is only quarter of real geometry with periodic boundary condition. I have tried all the ways that mentioned above but the error message still comes out every time "Divergence detected in AMG solver". Could you tell me that how did you solve your problem with the periodic bcs?

Thanks
Chris
chrischensong is offline   Reply With Quote

Old   April 16, 2014, 18:44
Default
  #30
New Member
 
Shravani
Join Date: Apr 2014
Posts: 1
Rep Power: 0
shrav is on a distinguished road
Quote:
Originally Posted by niloogh View Post
hi dear
my problem was related to the periodic boundaries.after changing some things in gambit ;i had solved my problem.if your problem has periodic boundaries i,ll explan it in details for you.
I have periodic boundaries in my model and i am facing the same error - divergence in the AMG solver x momentum. Can you plz explain how u solved ur problem
shrav is offline   Reply With Quote

Old   May 27, 2014, 07:01
Default
  #31
New Member
 
Noorul Huda
Join Date: Dec 2012
Location: Aligarh, UP India
Posts: 13
Rep Power: 4
noorul is on a distinguished road
Quote:
Originally Posted by ghost82 View Post
You must assign X as the axisymmetric axis.

Daniele
how to set the direction of axis symmetric flow?
noorul is offline   Reply With Quote

Old   May 27, 2014, 08:43
Default
  #32
Senior Member
 
ghost82's Avatar
 
Daniele
Join Date: Oct 2010
Location: Italy
Posts: 908
Rep Power: 15
ghost82 will become famous soon enough
It must be done in pre processing
ghost82 is offline   Reply With Quote

Reply

Tags
fluent, vof, vof model

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
divergence detected in AMG solver: momentum sudhakar FLUENT 31 April 14, 2015 15:51
divergence detected in AMG solver: temperature mashinsazi FLUENT 8 December 9, 2014 10:18
Divergence detected in AMG solver msatrustegui FLUENT 14 October 11, 2012 11:52
Divergence detected in AMG solver Musa FLUENT 3 March 4, 2012 13:40
AMG solver _divergence detected Shamoon FLUENT 6 March 11, 2009 08:59


All times are GMT -4. The time now is 03:18.