Interface zones are generated automatically, I can't say if they are necessary. I believe the air density is correct since it works in the solid-fluid case that I previously managed to get working. Attached is an image of this earlier solid-fluid simulation. It is slightly larger in dimensions, but otherwise, it operates on the same principle. In that case, natural convection works, and the residuals converge. In the solid-fluid-solid situation, there is probably some boundary condition issue, but I can't pinpoint what it is.
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Here is results of that solid-fluid case.
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