high velocity flow - problem with convergence

Kevin88 · May 23, 2012, 09:00

Trying to model high velocity flow (400m/s) through a pipe system in Fluent. Are there any specific models that should be turned on to aid convergence?
if not, can relaxation factors be tweaked in any way to help?

Far · May 23, 2012, 11:26

Quote:

Trying to model high velocity flow (400m/s) through a pipe system in Fluent. Are there any specific models that should be turned on to aid convergence?
if not, can relaxation factors be tweaked in any way to help?

use density based solver with hybrid initialisation and solution steering. In solution steering choose the min CLF = 0.1 (or lower) and max = 50 and choose the flow regime (transonic or supersonic)

Kevin88 · May 24, 2012, 04:32

Thanks for the reply Far. I was wondering what CLF stands for in the solution steering? I can't see anything that it might refer to.

Thanks again
Kevin

Far · May 24, 2012, 05:17

min and max courant number

go to "more settings" and you find that option there.

https://www.sharcnet.ca/Software/Flu...ug/node840.htm

https://www.sharcnet.ca/Software/Flu...ug/node838.htm

Kevin88 · May 24, 2012, 06:40

Thanks Far. Much appreciated

May 23, 2012, 09:00	high velocity flow - problem with convergence	#1
Kevin88 New Member Kevin Join Date: May 2012 Posts: 4 Rep Power: 13	Trying to model high velocity flow (400m/s) through a pipe system in Fluent. Are there any specific models that should be turned on to aid convergence? if not, can relaxation factors be tweaked in any way to help?

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May 24, 2012, 04:32		#3
Kevin88 New Member Kevin Join Date: May 2012 Posts: 4 Rep Power: 13	Thanks for the reply Far. I was wondering what CLF stands for in the solution steering? I can't see anything that it might refer to. Thanks again Kevin

May 24, 2012, 05:17		#4
Far Super Moderator Sijal Join Date: Mar 2009 Location: Islamabad Posts: 4,553 Blog Entries: 6 Rep Power: 54	min and max courant number go to "more settings" and you find that option there. https://www.sharcnet.ca/Software/Flu...ug/node840.htm https://www.sharcnet.ca/Software/Flu...ug/node838.htm

May 24, 2012, 06:40		#5
Kevin88 New Member Kevin Join Date: May 2012 Posts: 4 Rep Power: 13	Thanks Far. Much appreciated