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Concentric spheres with heat generation

Concentric spheres with heat generation

Concentric spheres with heat generation

(OP)
I have been toying around with this idea for awhile now and I can't get it to work. I want to model a TRISO fuel pellet. This means I have a uranium sphere coated in several ceramics while thousands of these small fuel pellets are embedded into a graphite spehere in some kind of distribution. I am having trouble creating all of this. I have my models for each individual piece created but when i merge with boundaries I cannot select the interior surface to select the heat generation within the uranium. I have tried making boundary conditions between shells and that has also failed me because of my inexperience with them. Is there a way I can get heat generation with a portion of a sphere that can later be duplicated and merged into another item. I plan on doing this as a 1/8th of a sphere in order to get the most I can out of the symmetry. I plan on using a surface film condition that replicates liquid sodium passing over the surface. If anyone can give me a good starting point that would be helpful. Thank you.

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