stopping CFX solution run at best results

MGabr · October 3, 2012, 10:08

My question is, how can I stop CFX solution run at best results although it stopped at a result due to max. number of loops reached.

Best regards
M.Gabr

eng_norouzi · October 3, 2012, 10:24

the best result is when your residual curves are like a flat line.
this means that your solution is converged properly.

MGabr · October 3, 2012, 11:22

i mean that if RMS curves are like sin wave and solution stopped at it's peak due to reaching max. number of loops . could i select at which accumulated time step should it stop after run finished ?????

thanks

evcelica · October 3, 2012, 15:51

I don't know why you would want to do this, If your residuals are oscillating there is probably a transient part of the fluid flow, (vortex shedding) In this case the iteration with lower residuals is no more correct than the one with higher residuals. If you still want to do this though....you can write results files every so often, this is done in CFX-PRE under "output controls"

ghorrocks · October 4, 2012, 07:40

This question looks like an FAQ to me: http://www.cfd-online.com/Wiki/Ansys...gence_criteria

October 3, 2012, 10:08	stopping CFX solution run at best results	#1
MGabr Member Mahmoud Gabr Join Date: Aug 2012 Location: Egypt Posts: 30 Rep Power: 13	My question is, how can I stop CFX solution run at best results although it stopped at a result due to max. number of loops reached. Best regards M.Gabr

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
ANSYS Workbench on "Uncertified" Linux Distros	hsr	CFX	289	April 20, 2023 09:23
What happens to CFX when I run LES?	ursh	CFX	1	June 1, 2017 04:10
CFX Varying time-step and Results freequency	jstaylor89	Main CFD Forum	0	April 16, 2012 11:14
Working directory via command line	Luiz	CFX	4	March 6, 2011 20:02
CFX vs. Fluent Results	n.sharifi	CFX	8	November 3, 2010 16:40

October 3, 2012, 10:24		#2
eng_norouzi Member ali Join Date: Feb 2011 Posts: 37 Rep Power: 15	the best result is when your residual curves are like a flat line. this means that your solution is converged properly.

October 3, 2012, 11:22		#3
MGabr Member Mahmoud Gabr Join Date: Aug 2012 Location: Egypt Posts: 30 Rep Power: 13	i mean that if RMS curves are like sin wave and solution stopped at it's peak due to reaching max. number of loops . could i select at which accumulated time step should it stop after run finished ????? thanks

October 3, 2012, 15:51		#4
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,167 Rep Power: 23	I don't know why you would want to do this, If your residuals are oscillating there is probably a transient part of the fluid flow, (vortex shedding) In this case the iteration with lower residuals is no more correct than the one with higher residuals. If you still want to do this though....you can write results files every so often, this is done in CFX-PRE under "output controls"

October 4, 2012, 07:40		#5
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,700 Rep Power: 143	This question looks like an FAQ to me: http://www.cfd-online.com/Wiki/Ansys...gence_criteria