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IDProjectCategoryView StatusDate SubmittedLast Update
0000693OpenFOAMBugpublic2012-12-02 09:402012-12-04 15:24
Reportersakuma Assigned Tohenry  
PrioritynormalSeverityminorReproducibilityalways
Status resolvedResolutionfixed 
PlatformLinuxOSUbuntuOS Version11.04
Summary0000693: About recently change of incompressible kOmegaSST model
DescriptionFlow rate and convergence condition are largely changed in the same mesh model.
Additional InformationPlease see attached file. The data in the holder of before_update is the source code of incompressible kOmegaSSt on September. Other data in then holder of after_update is the source code of one’s on November.
TagsNo tags attached.

Activities

sakuma

2012-12-02 09:40

reporter  

2012_12_01.tar.gz (931,957 bytes)

henry

2012-12-02 09:53

manager   ~0001794

The addition of the F3 term will change the results but it is recommended for some conditions, particularly with rough wall-functions. However, if the previous behaviour is prefered for some cases/conditions we could make the F3 term optional.

sakuma

2012-12-03 14:48

reporter   ~0001795

Thank you very early reply. In my fan performance analysis, incompressible kOmegaSST model on September code shows good agreement to experimental result. So, if possible, I would like to use incompressible kOmegaSST model with changing option of F3 term.

henry

2012-12-03 15:06

manager   ~0001796

OK, we will add a switch for the F3 term (default off).

It would also be useful to know why the F3 term has such a dramatic effect on your case. Does your case run with it if you restart from a solution from the model without the F3 term? It looks like the start-up of the case is problemetic, maybe you could try under-relaxing the turbulence properties aggressively during the early part of the run, or start from a potential solution... It is possible that the F3 term is actually OK but the case is on the edge of stability and the F3 term pushed it over the edge.

sakuma

2012-12-04 14:53

reporter  

2012_12_04.zip (125,515 bytes)

sakuma

2012-12-04 14:54

reporter   ~0001809

I thank to your reply and suggestion. I attach initial setting files and pattern diagram of calculation model. I will recheck my model.

henry

2012-12-04 15:21

manager   ~0001810

From this do you know why the F3 term has a significant impact on the case? Do any of my suggestions above help the case run with F3?

henry

2012-12-04 15:24

manager   ~0001811

F3 is now optional and the default is off.
Resolved by commit f90e2e202c6173a8885dbe2e2d9f09ae5a8afdb1

Issue History

Date Modified Username Field Change
2012-12-02 09:40 sakuma New Issue
2012-12-02 09:40 sakuma File Added: 2012_12_01.tar.gz
2012-12-02 09:53 henry Note Added: 0001794
2012-12-03 14:48 sakuma Note Added: 0001795
2012-12-03 15:06 henry Note Added: 0001796
2012-12-04 14:53 sakuma File Added: 2012_12_04.zip
2012-12-04 14:54 sakuma Note Added: 0001809
2012-12-04 15:21 henry Note Added: 0001810
2012-12-04 15:24 henry Note Added: 0001811
2012-12-04 15:24 henry Status new => resolved
2012-12-04 15:24 henry Resolution open => fixed
2012-12-04 15:24 henry Assigned To => henry