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

How to export raw residual

Register Blogs Community New Posts Updated Threads Search

Like Tree2Likes
  • 2 Post By lostking18

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   March 18, 2018, 16:47
Default How to export raw residual
  #1
Member
 
phd
Join Date: Oct 2013
Posts: 76
Rep Power: 13
lostking18 is on a distinguished road
Hi, may I ask if we can use CFX to output the raw residual? I say raw because CFX can only output the normalized residual. Since the normalization method is not public, I cannot obtain the real residual.

I have already set in the .pre with: 'output control' -> 'output equation rediduals' and obtained the residual results. However the residual I obtained is normalized by a ANSYS self designed parameters(a_p and delta_phi) as shown in the help documents. Could you tell me how can I get the non-normalized residual?

I also have tried the 'expert parameter' --> 'convergence control' --> 'imbalance normalization type' --> 'true'. But the residual I get is still non-dimensional.


If you are interested in the CFX help documents about normalization, here is the link: https://www.sharcnet.ca/Software/Ans.../i1312559.html

Thank you very much for your help!
lostking18 is offline   Reply With Quote

Old   March 19, 2018, 05:14
Default
  #2
Senior Member
 
Lance
Join Date: Mar 2009
Posts: 669
Rep Power: 22
Lance is on a distinguished road
I think you answered your own question.
Quote:
Originally Posted by lostking18 View Post
Since the normalization method is not public, I cannot obtain the real residual.
Why do you want the raw values?
Lance is offline   Reply With Quote

Old   March 19, 2018, 07:40
Default
  #3
Member
 
phd
Join Date: Oct 2013
Posts: 76
Rep Power: 13
lostking18 is on a distinguished road
Quote:
Originally Posted by Lance View Post
I think you answered your own question.

Why do you want the raw values?
Hi, Lance, thanks for answering. My current research really need raw residual to analyze the imbalance of the flow. I am wondering if there is any method to obtain the residual/ imbalance of each cell.
lostking18 is offline   Reply With Quote

Old   March 19, 2018, 17:36
Default
  #4
Super Moderator
 
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,854
Rep Power: 144
ghorrocks is just really niceghorrocks is just really niceghorrocks is just really niceghorrocks is just really nice
The variables are probably in the MMS, alternately you can probably calculate it from MMS variables. So you will need fortran to access it, and you will need a detailed guide to the MMS to find it. There is no detailed guide to the MMS in the public domain that I am aware of, so your only option is to talk to ANSYS support about this. Be prepared to answer the "why?" question with them as well
__________________
Note: I do not answer CFD questions by PM. CFD questions should be posted on the forum.
ghorrocks is offline   Reply With Quote

Old   March 19, 2018, 19:19
Default
  #5
Member
 
phd
Join Date: Oct 2013
Posts: 76
Rep Power: 13
lostking18 is on a distinguished road
Quote:
Originally Posted by ghorrocks View Post
The variables are probably in the MMS, alternately you can probably calculate it from MMS variables. So you will need fortran to access it, and you will need a detailed guide to the MMS to find it. There is no detailed guide to the MMS in the public domain that I am aware of, so your only option is to talk to ANSYS support about this. Be prepared to answer the "why?" question with them as well
Hi, ghorrocks, Thank you very much for your suggestions! That's a good point. I do need to learn MMS in the future. However now with the supporter's help I have successfully solve this problem:

EXPERT PARAMETERS:
resid normalisation type = 0
END

will do the work!!! I'm really grateful to the supporter named Holger who gave me a fast and efficient reply. Hope this will help other people visit this page.
-Maxim- and aero_head like this.
lostking18 is offline   Reply With Quote

Reply

Tags
imbalance, residuals


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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Segmentation fault when using reactingFOAM for Fluids Tommy Floessner OpenFOAM Running, Solving & CFD 4 April 22, 2018 13:30
chtMultiRegionSimpleFoam turbulent case Aditya Patil OpenFOAM Running, Solving & CFD 6 April 24, 2017 23:13
simpleFoam error - "Floating point exception" mbcx4jc2 OpenFOAM Running, Solving & CFD 12 August 4, 2015 03:20
calculation stops after few time steps sivakumar OpenFOAM Running, Solving & CFD 7 March 17, 2013 07:37
Orifice Plate with a fully developed flow - Problems with convergence jonmec OpenFOAM Running, Solving & CFD 3 July 28, 2011 06:24


All times are GMT -4. The time now is 10:49.