Fixing Divergence Caused by Modeling Ambient Air Heated by Furnace

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Hello All

I am a research intern who is attempting to model the effects of boring a hole into a furnace utilized at our lab as we wish to know how hot the surroundings will become due to this hole. I have had no issues creating the geometry, and the simulation converges and behaves just fine when it is just the furnace with the bored hole, but once I add a block of air above the furnace to model the ambient air around this bored hole my simulation consistently diverges.

To help picture the study I have attached a screen-shot of the model in question. The rectangle on top is the block of air causing divergence.

I am running a stationary multi-physics study of heat transfer in fluids and laminar flow. For physics, the air in question is assigned laminar flow and ambient initial conditions. Gravity is on, and as the air is a boundary of the simulation, I have assigned it the boundary condition of heat flux just like the rest of outer layer of the model to simulate convective cooling of this block of air from the ambient air around it thats not being explicitly included in the geometry.

To preface I am not well versed in FEA nor PDE's, so I am sorry if my question seems trivial or foolish. This problem also seemed quite simple to me but I cannot get anything to converge for the life of me so I am hoping someone who knows anything could potentially help. If any more information is needed, please ask and I will specify.

Thank you



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