is it converged?

uvvis · June 22, 2016, 22:58

is it converged? Convergence criteria (10-4).IMG_6153.jpg

IMG_6152.jpg

Opaque · June 22, 2016, 23:46

Very likely is not converged.

If you change the range of the plot for the imbalances, and monitor the last 50 iterations you may see how well the conservation targets are satisfied.

uvvis · June 23, 2016, 00:20

Thank you for replying. I did and pic is attached. is it acceptable below 5 %? How can i improve convergence? I also refined mesh but situation is same.IMG_6154.jpg

diamondx · June 23, 2016, 01:17

Monitor other variable, temperature out, average temperature, mass flow in - mass flow out, pressure out. You HAVE to monitor what you are interested in... don't rely on those curves only. From the picture you showed try to refine your mesh if your case is fine...

uvvis · June 23, 2016, 04:08

diamondx Thank you!
Please see the the monitor points for my interest (pic attached).
IMG_6157.jpg

ghorrocks · June 23, 2016, 08:14

This question is discussed in this FAQ: http://www.cfd-online.com/Wiki/Ansys...gence_criteria

June 22, 2016, 22:58	is it converged?	#1
uvvis New Member uvvis Join Date: Jan 2015 Posts: 5 Rep Power: 11	is it converged? Convergence criteria (10-4).IMG_6153.jpg IMG_6152.jpg

June 23, 2016, 01:17		#4
diamondx Super Moderator Ghazlani M. Ali Join Date: May 2011 Location: Tokyo, Japan Posts: 1,385 Blog Entries: 23 Rep Power: 29	Monitor other variable, temperature out, average temperature, mass flow in - mass flow out, pressure out. You HAVE to monitor what you are interested in... don't rely on those curves only. From the picture you showed try to refine your mesh if your case is fine... __________________ Regards, New to ICEM CFD, try this document --> https://goo.gl/KAOIwm Ali

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June 22, 2016, 23:46		#2
Opaque Senior Member Join Date: Jun 2009 Posts: 1,880 Rep Power: 33	Very likely is not converged. If you change the range of the plot for the imbalances, and monitor the last 50 iterations you may see how well the conservation targets are satisfied.

June 23, 2016, 00:20		#3
uvvis New Member uvvis Join Date: Jan 2015 Posts: 5 Rep Power: 11	Thank you for replying. I did and pic is attached. is it acceptable below 5 %? How can i improve convergence? I also refined mesh but situation is same.IMG_6154.jpg

June 23, 2016, 04:08		#5
uvvis New Member uvvis Join Date: Jan 2015 Posts: 5 Rep Power: 11	diamondx Thank you! Please see the the monitor points for my interest (pic attached). IMG_6157.jpg

June 23, 2016, 08:14		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,871 Rep Power: 144	This question is discussed in this FAQ: http://www.cfd-online.com/Wiki/Ansys...gence_criteria