plotting residual field

syoon · March 30, 2009, 09:12

I have a difficulty in obtaining a convergence.
Achieved rms is 10^-4 and max is 10^-3, so far.

I would like to identify where max occurs.
Is there any way to visualise rms and max using CFX-post?

Regards,
Sungho

Timon · March 30, 2009, 09:18

Yes, but you need to switch on residual output explicitly. You can do this in pre ("output control tab") or by adding expert parameter "output eq residuals = t" . The residuals will then be present as variables in post.

syoon · March 30, 2009, 09:20

Thank you, Timon.

rikio · March 30, 2009, 10:06

You can just display the elements of MAX residuals by plotting related volumes. The node numbers are shown in the table of "Locations of Maximum Residuals" at the end of the out file.

syoon · March 30, 2009, 10:09

Thank you, rikio.
It's helpful to know the information.

ghorrocks · March 30, 2009, 17:54

Hi,

you might also find this useful:

http://www.cfd-online.com/Wiki/Ansys...gence_criteria

Glenn Horrocks

syoon · April 1, 2009, 04:13

Thank you, Glenn.
I found it is very helpful.

Sungho

March 30, 2009, 09:12	plotting residual field	#1
syoon New Member sungho yoon Join Date: Mar 2009 Posts: 20 Rep Power: 17	I have a difficulty in obtaining a convergence. Achieved rms is 10^-4 and max is 10^-3, so far. I would like to identify where max occurs. Is there any way to visualise rms and max using CFX-post? Regards, Sungho

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March 30, 2009, 09:18		#2
Timon Member Join Date: Mar 2009 Posts: 44 Rep Power: 17	Yes, but you need to switch on residual output explicitly. You can do this in pre ("output control tab") or by adding expert parameter "output eq residuals = t" . The residuals will then be present as variables in post.

March 30, 2009, 09:20		#3
syoon New Member sungho yoon Join Date: Mar 2009 Posts: 20 Rep Power: 17	Thank you, Timon.

March 30, 2009, 10:06		#4
rikio Senior Member Rikio Join Date: Mar 2009 Location: SH, China Posts: 182 Blog Entries: 1 Rep Power: 17	You can just display the elements of MAX residuals by plotting related volumes. The node numbers are shown in the table of "Locations of Maximum Residuals" at the end of the out file.

March 30, 2009, 10:09		#5
syoon New Member sungho yoon Join Date: Mar 2009 Posts: 20 Rep Power: 17	Thank you, rikio. It's helpful to know the information.

March 30, 2009, 17:54		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Hi, you might also find this useful: http://www.cfd-online.com/Wiki/Ansys...gence_criteria Glenn Horrocks

April 1, 2009, 04:13		#7
syoon New Member sungho yoon Join Date: Mar 2009 Posts: 20 Rep Power: 17	Thank you, Glenn. I found it is very helpful. Sungho