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

[CFD-Post] Viewing max residuals

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

Reply
 
LinkBack Thread Tools Display Modes
Old   July 26, 2012, 04:50
Default [CFD-Post] Viewing max residuals
  #1
siw
Senior Member
 
Join Date: Jul 2009
Posts: 444
Rep Power: 14
siw will become famous soon enough
Hi,

Is it possible to view in CFD-Post where the maximum residual (as plotted by the CFD-solver during a simulation) is in a fluid domain? I've tried Isosurface, Contours, Function calculator but cannot find where to get the max residual locations.

If I can where it is occuring then I can improve the mesh in that area to improve the RMS residuals and convergence - even though I'm getting a constant residual and monitor point values the RMS residual valve needs to go down by another order of magnitude.

Thanks
siw is offline   Reply With Quote

Old   July 26, 2012, 05:16
Default
  #2
Senior Member
 
Lance
Join Date: Mar 2009
Posts: 522
Rep Power: 11
Lance is on a distinguished road
You can get the residuals in post if you have checked the "output equation residuals" in pre (under output control). Then they will show up in the variables list in post.
Lance is offline   Reply With Quote

Old   July 26, 2012, 05:59
Default
  #3
siw
Senior Member
 
Join Date: Jul 2009
Posts: 444
Rep Power: 14
siw will become famous soon enough
Thanks Lance.

I must have missed it in Output Control when I set up my monitor points.

However, I don't see any mention of residuals in the Variables list (even expanded all the lists in Variables). Have I done something wrong or am I looking in the wrong place (even though I think I've run out of place to look)?

Last edited by siw; July 26, 2012 at 06:39. Reason: Update for finished simulation
siw is offline   Reply With Quote

Old   July 26, 2012, 09:29
Default
  #4
Senior Member
 
Lance
Join Date: Mar 2009
Posts: 522
Rep Power: 11
Lance is on a distinguished road
They should be in the variables list, named something like P.Mass Residual, etc.

After the "output eqn residuals" check box, did you change "Eqn. Residuals" to "All" from "None"?
If you run transient you'll need to check the "output eqn residuals" box under trn results as well to get the residuals in the trn files and not only in the .res file.
Lance is offline   Reply With Quote

Old   May 21, 2014, 07:32
Default
  #5
New Member
 
Simon
Join Date: Apr 2014
Location: Stuttgart, Germany
Posts: 22
Rep Power: 3
error404 is on a distinguished road
You can visualize the max. or min. residuals with a "point".

Then you can refine your mesh at this location.
error404 is offline   Reply With Quote

Reply

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
Force can not converge colopolo CFX 13 October 4, 2011 22:03
Upgraded from Karmic Koala 9.10 to Lucid Lynx10.04.3 bookie56 OpenFOAM Installation 8 August 13, 2011 04:03
On the damBreak4phaseFine cases paean OpenFOAM Running, Solving & CFD 0 November 14, 2008 22:14
Could anybody help me see this error and give help liugx212 OpenFOAM Running, Solving & CFD 3 January 4, 2006 19:07
Viewing residuals Bob Malone CFX 2 February 19, 2001 09:47


All times are GMT -4. The time now is 20:37.