Diefference between tolerance and residual control

ASo · March 30, 2015, 11:47

Hi all,

I'm looking for details about the convergence criteria for the simpleFoam solver.
This document explains the simpleFoam solver : https://openfoamwiki.net/index.php/O...hm_in_OpenFOAM
As far as I understand : the "tolerance" and "reltol" parameters define when the algorithm stops to go to the next time step.

Am I wright about this ??

I've read that residual controls (set for each field) act on initial residual.
I don't realy understand what are the initial residual.

Thx for answer

ASo · April 9, 2015, 06:27

Hi all,

No one knows about the initial residuals ? Or could give me documentation about it ?

Sorry for my bad English I'm french !!

Thanks for answers.

alexeym · April 9, 2015, 06:47

Hi,

In fact forum has search functionality:

http://www.cfd-online.com/Forums/ope...d-solvers.html

March 30, 2015, 11:47	Diefference between tolerance and residual control	#1
ASo New Member Join Date: Mar 2015 Location: Brest, France Posts: 15 Rep Power: 12	Hi all, I'm looking for details about the convergence criteria for the simpleFoam solver. This document explains the simpleFoam solver : https://openfoamwiki.net/index.php/O...hm_in_OpenFOAM As far as I understand : the "tolerance" and "reltol" parameters define when the algorithm stops to go to the next time step. Am I wright about this ?? I've read that residual controls (set for each field) act on initial residual. I don't realy understand what are the initial residual. Thx for answer

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April 9, 2015, 06:27		#2
ASo New Member Join Date: Mar 2015 Location: Brest, France Posts: 15 Rep Power: 12	Hi all, No one knows about the initial residuals ? Or could give me documentation about it ? Sorry for my bad English I'm french !! Thanks for answers.

April 9, 2015, 06:47		#3
alexeym Senior Member Alexey Matveichev Join Date: Aug 2011 Location: Nancy, France Posts: 1,938 Rep Power: 40	Hi, In fact forum has search functionality: http://www.cfd-online.com/Forums/ope...d-solvers.html