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March 18, 2018, 16:47 |
How to export raw residual
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#1 |
Member
phd
Join Date: Oct 2013
Posts: 76
Rep Power: 13 |
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! |
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March 19, 2018, 05:14 |
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#2 |
Senior Member
Lance
Join Date: Mar 2009
Posts: 669
Rep Power: 22 |
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March 19, 2018, 07:40 |
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#3 |
Member
phd
Join Date: Oct 2013
Posts: 76
Rep Power: 13 |
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.
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March 19, 2018, 17:36 |
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#4 |
Super Moderator
Glenn Horrocks
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 17,844
Rep Power: 144 |
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. |
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March 19, 2018, 19:19 |
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#5 | |
Member
phd
Join Date: Oct 2013
Posts: 76
Rep Power: 13 |
Quote:
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. |
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Tags |
imbalance, residuals |
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