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Coupled Heat Transfer (cond., rad.)

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Old   March 18, 2014, 08:38
Default Coupled Heat Transfer (cond., rad.)
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Hi,

I'm new to OpenFOAM and I was able to set up some simple fluid dynamic cases with ico..,piso.. Foam. But now I have to build up some more complicated cases with coupled heat transfer (steady state). The parts of my cases I have to study are surrounded by vacuum. Only radiative and conductive HT has to be solved (with viewFactor Methode).
I'm stucking with the tutorial files. It is very difficult to find a explanation for a simple case to start with.

Can someone help me to orientate.
As far as I know the following solvers are used for the tutorial cases.

-buoyantBoussinesqPimpleFoam
-buoyantBoussinesqSimpleFoam
-buoyantPimpleFoam
-buoyantSimpleFoam
-chtMultiRegionFoam
-chtMultiRegionSimpleFoam

For steady-state should be *SimpleFoam a good solver.
But whichone ? Other "normal" heat diffiusion problems have been solved with lagrangianFoam.

As you can see I'm quite confused. According to the doc's the viewFactor Methode is new and the most Tutorials are outdated or based on diy solvers.
e.g.

http://www.tfd.chalmers.se/~hani/kur...Foam_final.pdf

In this forum I found a similiar case but he used P1 and fvDOM:

http://www.cfd-online.com/Forums/ope...n-problem.html

But it confuses me even more and then there is this new baffle boundary...

I would be really glad for any help or example data's etc.

Best Regards,
Alex
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Old   March 26, 2014, 04:45
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...I don't like pushing threads. But unfortunately I need your help. Please give me some Info's ...or plain working data.

Thanks
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Old   March 26, 2014, 05:28
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If you are looking for steady state conjugate heat transfer chtMultiRegionSimpleFoam is the solver for you. The tutorials seem to have some radiation files but I am not sure how they work. I have never used them.
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Old   March 26, 2014, 10:14
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Hi Paritosh,

thank you very much for your reply. Actually I m trying to modify this case http://www.cfd-online.com/Forums/ope...n-problem.html
With minor success. From fvDOM to viewFactors. And yes your right, the chtMultiRegionSimpleFoam has viewFactors implemented. But the "multiple" Regions makes it difficult to understand which parameters are important and which are not neccessary or even their purpose is often unclear. The C++ Guide helps to orientated....but it is on an advanced lvl.

My modifikation

faceAgglomeration works without error.
But then viewFactorGen does not work. Crashs with the errormsg:

Create mesh for time = 0


Total number of coarse faces: 40
*** Error in `viewFactorsGen': free(): invalid next size (normal): 0x00000000022f76a0 ***
......

Maybe someone has an idea ?

Best regards,
Alex
Attached Files
File Type: gz Enclosure-buoyantSimpleFoam-viewFactors.tar.gz (20.0 KB, 12 views)
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conduction-radiation, heat transfer boundary, viewfactor

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