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radiation boundary condition on comsol4.0

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Hi
I am simulating radiation heat transfer with comsol 4.0 which I start using today. Before I was using Comsol 3.3. I am simulating same model which I modeled on 3.3 and it did not give me any error. When I used same model ( I modeled from scratch in 4.0) with all same properties I am getting following error.

" Radiation error: exactly one adjacent domain must be opaque. "

I am not clear what cause this error..

Please advise

thanks

1 Reply Last Post 27 ago 2010, 02:39 GMT-4
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)

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Posted: 1 decade ago 27 ago 2010, 02:39 GMT-4
Hi

I havent had time to play alot with the radiatio physics in V4, but I noticed that there are many boundary condition settings, so I suspect that you have missed one (do none of your surfaces absorb ?) could this be it ?

--
Good luck
Ivar
Hi I havent had time to play alot with the radiatio physics in V4, but I noticed that there are many boundary condition settings, so I suspect that you have missed one (do none of your surfaces absorb ?) could this be it ? -- Good luck Ivar

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