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Define vacuum conditions

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Old   June 29, 2015, 12:56
Default Define vacuum conditions
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Hi everybody,

I'm working on a radiation model using chtMultiRegionSimpleFoam (fvDOM). One region has to be vacuum, but I don't know how define it. This region is between two solids ( solid1_to_vacuum and solid2_to_vacuum), and the most important factor is the radiation has been emitted by solid1.

I don't know how introduce, in the region has been called "vacuum", the vacuum conditions or properties ( thermophisicalProperties, .....).

I thought that I could change thermal coefficients.......I changed it to 0....but it did not work.

could anyone help me?

Thanks!!
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Old   June 30, 2015, 03:47
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Without knowing much about your case: Did you try to set it to something really, really low but not zero? Such as 1e-10 ? Sometimes OpenFoam divides by these factors and you get a problem when setting it to "0".
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Old   July 2, 2015, 11:16
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I'm working on a chtMultiRegion case too and I am desperately trying to set up radiation modelling. I preferred to try first with viewFactor instead of fvDom for CPU purposes to no avail so far. In my case, as I have a huge mesh for a quite complex geometry I would not want an additional vacuum field to be calculated.

Since radiation is the only heat transfer through vacuum one would expect it to be possible...


Has anyone suggestions on how to proceed?

PS: I already checked this thread http://www.cfd-online.com/Forums/ope...ng-vacuum.html but I am not so skilled to modify the solver!
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