CFD Online Logo CFD Online URL
Home > Forums > OpenFOAM

Convergence rate of SimpleFoam

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   January 25, 2011, 04:49
Default Convergence rate of SimpleFoam
New Member
Join Date: Jan 2011
Posts: 2
Rep Power: 0
boddyouareboy is on a distinguished road
hello Everyone,
I am a new guy of OpenFoam, nowadays I come to a problem that I can not solve. So I came here for help.

It is about the convergence rate of simpleFoam (details of schemes, plots can be found in the attached file) The tol is 1e-9, but it seems to be heavy oscillation when residual is low than 1e-7, and it takes such a huge number of iterations to further decrease the residual. I tried to change the discretizing scheme of divergence, (change upwind to SFCD) but there always be FOAM error : "attempt to reach EOF", I have no idea but change the last item "div((nuEff*dev(grad(U).T())))" back to "Gauss linear", and the results seems to be not correct.

So my question is that "Is there something I can do to improve the convergence rate?" BTW, the Tol should not be changed, because I need this kind of precision. And I also hope that some one can explain why to do this, I'd really appreciate it!

Attached Images
File Type: png residual_of_Ux_P_OpenFoam.png (6.1 KB, 41 views)
Attached Files
File Type: zip (3.0 KB, 9 views)
boddyouareboy is offline   Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Convergence Problems SimpleFOAM Kutti OpenFOAM 16 June 14, 2010 08:12
Getting faster convergence in simpleFoam basneb OpenFOAM 8 February 9, 2010 05:20
Definition of convergence criterion in simpleFoam titio OpenFOAM Running, Solving & CFD 1 February 6, 2010 02:34
Convergence of CFX field in FSI analysis nasdak CFX 2 June 29, 2009 01:17
Convergence Rate Study Khurram Main CFD Forum 1 May 15, 2002 05:05

All times are GMT -4. The time now is 01:34.