@Erikbeeren, @creativemutation
I actually didn’t think THERM would work here because @creativemutation is asking (and illustrating) a simulation with heat source at the center of a geometry. As far as I know, interior heat generation can’t be simulated with THERM. @creativemutation is the heat source in the center important?
Also, I’ll admit I’ve been assuming that the question was about a transient state simulation, which was the other reason I didn’t think THERM would work. However, if evolving temperature over time isn’t important, and having a constant heat source at the boundary is acceptable, I agree THERM is the best tool here.