|
[Sponsors] |
November 19, 2010, 10:23 |
how to check convergence??
|
#1 |
Member
Sandeep
Join Date: Jul 2010
Posts: 48
Rep Power: 15 |
Hello all,
I am new to openFoam and started learning it with the available tutorials. I am able to run the case but I am not sure how to check if the residuals are converging. Where do I check them?? and where do I specify the the convergence criteria?? Any help woud be appreciated!! Thanks a ton!! Sandeep |
|
November 19, 2010, 11:10 |
|
#2 |
Member
Join Date: Dec 2009
Posts: 36
Rep Power: 16 |
Hello Sandeep!
Take a look at system/fvSolution and check the screen output. Alternatively you can save the screen output in a log file. Regards fritz |
|
November 19, 2010, 11:15 |
|
#3 |
Member
Sandeep
Join Date: Jul 2010
Posts: 48
Rep Power: 15 |
Hi fritz,
I am sorry I did not understand what u meant to check the screen output. fvSolutions file has just solvers and PISO dictionaries in it. |
|
November 19, 2010, 12:58 |
|
#4 | |
Member
Join Date: Dec 2009
Posts: 36
Rep Power: 16 |
How are you running your case?
Normaly, you see something like below on your screen and in the log-file, too. Quote:
|
||
November 19, 2010, 18:50 |
|
#5 |
Member
Robin Gilbert
Join Date: Jan 2010
Posts: 66
Rep Power: 16 |
http://www.cfd-online.com/Forums/ope...residuals.html
try that link. it shows how to plot residuals. or u can see the screen output while running the simulation. it shows the initial and final residual at each time step. generally as far as i know if the initial residuals are going down, it means solution is converging. Somebody please correct me if i am wrong. |
|
November 21, 2010, 09:20 |
yes!
|
#6 |
Member
Mohammad.R.Shetab
Join Date: Jul 2010
Posts: 49
Rep Power: 15 |
you are correct!! but I think thats not enough!! you should monitor some characteristics of your case in some points.( you can try sampleDict for this).
To plot residuals you can try pyFoam. It works properly. |
|
November 22, 2010, 02:41 |
|
#7 |
Senior Member
|
||
December 21, 2010, 08:07 |
|
#8 |
New Member
Gregor Seljak
Join Date: Oct 2010
Posts: 21
Rep Power: 15 |
||
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
convergence check implemented in OF-1.6.x | vaina74 | OpenFOAM Running, Solving & CFD | 5 | June 3, 2010 08:35 |
critical error during installation of openfoam | Fabio88 | OpenFOAM Installation | 21 | June 2, 2010 03:01 |
OF 1.6 | Ubuntu 9.10 (64bit) | GLIBCXX_3.4.11 not found | piprus | OpenFOAM Installation | 22 | February 25, 2010 13:43 |
Problems in compiling paraview in Suse 10.3 platform | chiven | OpenFOAM Installation | 3 | December 1, 2009 07:21 |
Convergence of CFX field in FSI analysis | nasdak | CFX | 2 | June 29, 2009 01:17 |