I have a cylinder which is enclosed by a hollow cylinder. I need to apply a vaccum b/w them. How to account for radiation in this case?
I think that if you specify "exclude cavities without flow conditions" then the corresponding cavities will be ignored and there will be no convection because there is no fluid..!.
Then, if you want to take radiation into account, you have to select the corresponding option in general settings. And most important, define the faces that play a role in your radiation problem as radiative surfaces (there are many already defined radiation surfaces in the engineering databes).
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