Convergence criteria

steventay · February 19, 2010, 11:42

Hello,

Is there any way to set different convergence criteria for momentum & mass and heat transfer for CFX? Currently, there is only one setting for all. I know that Fluent is able to do it but not sure whether CFX is able to do that too. Appreciate if there are anyone that are able to advise me. Many thanks!

zboud · February 19, 2010, 12:20

Right click on "Solver control" in CFX-Pre > Edit > Equation Class Settings tab!

steventay · February 19, 2010, 12:47

Hi Zboud,

Many thanks for your fast respond! I will try it out.

steventay · February 20, 2010, 11:40

Hi Zboud,

Under the basic setting of solver control, there is a convergence criteria setting for RMS. By setting the RMS value, it will set the convergnce criteria for energy, momentum and so on.. I wanted to set the convergence critegia of individual item like, thermal energy - 1e-6, momentum - 1e-3... Is that possible? Need your advice. Thanks.

feizaghaee · February 20, 2010, 13:39

az prout said check the Equation Class Settings tab you can do that.

steventay · February 21, 2010, 03:46

Hi,

I am running transient and the convergence control does not appear at the equation class setting. I realised that the convergence control for individual item will only appear when the run is set to steady state. Does that mean that I will not be able to set individual convergence criteria if the run is set to transient?

Jade M · May 14, 2010, 13:48

In Pre, right click on Solver Control and select Edit. Under Convergence Criteria, check Conservation Target and set a value. I understand that 0.01 is a pretty good value to use.

February 19, 2010, 11:42	Convergence criteria	#1
steventay New Member Steven Tay Join Date: Jan 2010 Posts: 28 Rep Power: 16	Hello, Is there any way to set different convergence criteria for momentum & mass and heat transfer for CFX? Currently, there is only one setting for all. I know that Fluent is able to do it but not sure whether CFX is able to do that too. Appreciate if there are anyone that are able to advise me. Many thanks!

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February 19, 2010, 12:20		#2
zboud Member prout Join Date: May 2009 Posts: 32 Rep Power: 17	Right click on "Solver control" in CFX-Pre > Edit > Equation Class Settings tab!

February 19, 2010, 12:47		#3
steventay New Member Steven Tay Join Date: Jan 2010 Posts: 28 Rep Power: 16	Hi Zboud, Many thanks for your fast respond! I will try it out.

February 20, 2010, 11:40		#4
steventay New Member Steven Tay Join Date: Jan 2010 Posts: 28 Rep Power: 16	Hi Zboud, Under the basic setting of solver control, there is a convergence criteria setting for RMS. By setting the RMS value, it will set the convergnce criteria for energy, momentum and so on.. I wanted to set the convergence critegia of individual item like, thermal energy - 1e-6, momentum - 1e-3... Is that possible? Need your advice. Thanks.

February 20, 2010, 13:39		#5
feizaghaee Senior Member moein Join Date: Dec 2009 Posts: 132 Rep Power: 16	az prout said check the Equation Class Settings tab you can do that.

February 21, 2010, 03:46		#6
steventay New Member Steven Tay Join Date: Jan 2010 Posts: 28 Rep Power: 16	Hi, I am running transient and the convergence control does not appear at the equation class setting. I realised that the convergence control for individual item will only appear when the run is set to steady state. Does that mean that I will not be able to set individual convergence criteria if the run is set to transient?

May 14, 2010, 13:48		#7
Jade M Senior Member Join Date: Feb 2010 Posts: 148 Rep Power: 17	In Pre, right click on Solver Control and select Edit. Under Convergence Criteria, check Conservation Target and set a value. I understand that 0.01 is a pretty good value to use.