solution converged

shaswat · February 3, 2012, 01:27

Dear folks
I would like to know how to find the solution is converged
Please help me

Please find the attached print screen shot.

I need your help about the converged solution

Regards

shashwat

Graham81 · February 3, 2012, 02:27

Check your global parameter of interest to see if it has reached a steady value.

ghorrocks · February 3, 2012, 05:40

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

shaswat · February 3, 2012, 06:20

Quote:

Originally Posted by Graham81

Check your global parameter of interest to see if it has reached a steady value.

How to set the global parameter

Is it monitor points?

Thanks

Regards

Shashwat

faisal_durr · February 3, 2012, 06:31

Suppose you are interested in the final flow patterns. Then for that I would suggest you introduce velocity monitors through out the domain and watch those value reach a certain value during solver. Once they have reached a statistically stationary state then try to reduce your time step value to reduce your residual value to suppose 1e-5. Then you can consider your simulation converged.

ghorrocks · February 5, 2012, 17:16

Faisal's comment is simplistic and not generally applicable. The FAQ discussion on this topic is more general http://www.cfd-online.com/Wiki/Ansys...gence_criteria

faisal_durr · February 6, 2012, 13:57

Quote:

Originally Posted by ghorrocks

Faisal's comment is simplistic and not generally applicable. The FAQ discussion on this topic is more general http://www.cfd-online.com/Wiki/Ansys...gence_criteria

Hi, I checked out the link, it says to read a Tips on obtaining convergence section in the CFX documentation. Can you please provide a link to it as I am finding difficulty in finding this section. Thanks

ghorrocks · February 6, 2012, 18:48

/ANSYS Inc/commonfiles/v140/help/en-us/pdf, then all the PDF files starting with cfx_*.pdf. The Modelling guide, pre, theory and reference manual contain useful information.

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February 3, 2012, 02:27		#2
Graham81 Member Join Date: Dec 2009 Posts: 55 Rep Power: 4	Check your global parameter of interest to see if it has reached a steady value.

February 3, 2012, 05:40		#3
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 5,068 Rep Power: 42	This question is related to this FAQ: http://www.cfd-online.com/Wiki/Ansys...gence_criteria

February 3, 2012, 06:31		#5
faisal_durr Member Faisal Durrani Join Date: Nov 2009 Location: England Posts: 56 Rep Power: 4	Suppose you are interested in the final flow patterns. Then for that I would suggest you introduce velocity monitors through out the domain and watch those value reach a certain value during solver. Once they have reached a statistically stationary state then try to reduce your time step value to reduce your residual value to suppose 1e-5. Then you can consider your simulation converged.

February 5, 2012, 17:16		#6
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 5,068 Rep Power: 42	Faisal's comment is simplistic and not generally applicable. The FAQ discussion on this topic is more general http://www.cfd-online.com/Wiki/Ansys...gence_criteria

February 6, 2012, 18:48		#8
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 5,068 Rep Power: 42	/ANSYS Inc/commonfiles/v140/help/en-us/pdf, then all the PDF files starting with cfx_*.pdf. The Modelling guide, pre, theory and reference manual contain useful information.