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-   -   Differences between new and old versions of 1.5-dev (http://www.cfd-online.com/Forums/openfoam/79630-differences-between-new-old-versions-1-5-dev.html)

benk August 29, 2010 17:37

Differences between new and old versions of 1.5-dev
 
I work with OpenFoam 1.5-dev at work and at home. At work we've had 1.5-dev installed for a long time (I'm not sure exactly when it was last updated but I'm guessing over a year ago).

Today, using my home computer, I installed 1.5-dev by

svn co https://openfoam-extend.svn.sourcefo...enFOAM-1.5-dev

The weird thing is that my model developed at work, which works with the 1.5-dev at work, doesn't work on my new installation of 1.5-dev at home.

Specifically, I'm using the coupledFvScalarMatrix functonality of 1.5-dev (also used in conjugateHeatFoam). Basically when I run my model at home, it works for the first time step and then starts to oscillate and never converges whereas at work, there are no problems. I'm not sure exactly what the problem is...the tutorial problems run on my new 1.5-dev installation.

Here's an example of a model which runs at work using an old version of 1.5-dev but doesn't run using 1.5-dev that I installed today: http://dl.dropbox.com/u/12812/OF/test.tgz

If anybody has time to run this on your 1.5-dev, just type:
tar -zxvf test.tgz
cd test/Aug29/testFoam
wclean;wmake
cd ../case
testFoam

I'm not sure what the problem is but like I said, this works perfectly on an old version of 1.5-dev but not on my new installation.

deepsterblue August 29, 2010 19:53

Do an 'svn info' on both installations, and track the file changes between the two versions. That should narrow down your search to what went wrong.

benk August 29, 2010 20:11

This is from the old installation at work:


Path: .
URL: https://openfoam-extend.svn.sourcefo...enFOAM-1.5-dev
Repository Root: https://openfoam-extend.svn.sourcefo...penfoam-extend
Repository UUID: e4e07f05-0c2f-0410-a05a-b8ba57e0c909
Revision: 1397
Node Kind: directory
Schedule: normal
Last Changed Author: hjasak
Last Changed Rev: 1397
Last Changed Date: 2009-08-14 05:22:30 -0400 (Fri, 14 Aug 2009)


and this is on my home comp:


Path: .
URL: https://openfoam-extend.svn.sourcefo...enFOAM-1.5-dev
Repository Root: https://openfoam-extend.svn.sourcefo...penfoam-extend
Repository UUID: e4e07f05-0c2f-0410-a05a-b8ba57e0c909
Revision: 1822
Node Kind: directory
Schedule: normal
Last Changed Author: deepsterblue
Last Changed Rev: 1822
Last Changed Date: 2010-08-26 15:57:35 -0400 (Thu, 26 Aug 2010)


I'm guessing a lot of things could have changed between those two revisions.

deepsterblue August 29, 2010 20:29

Yup. What you could do is pick a revision somewhere in between and, in some weird sense, perform your own root-finding algorithm to pin-point a certain revision :)

benk August 29, 2010 22:04

It appears as if there is a problem with the CrankNicholson scheme in the new 1.5-dev revisions. Using the Euler scheme works though.

deepsterblue August 29, 2010 22:08

Perhaps you could file a bug-report, with a small suitable test-case that can reproduce the problem. I believe the Mantis system is appropriate for this - but I'm a newbie in that regard. Perhaps Bernhard / Martin can be of some assistance here.

benk August 30, 2010 09:03

I'll have to look a bit more into this. In the conjugateHeatFoam tutorial that comes with the new revision of 1.5-dev, I was able to use the CrankNicholson time scheme but with my model posted above it only solves with the Euler time scheme.


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