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Another Relatively Simple Natural Convection Problem....

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Hello,

I have been trying to model a very simple problem of natural heat convection, onto which I would like to eventually add some complexity. Unfortunately, I've been unable to make the simple system work. My simple system is a suspended piece of glass in air with a heat source applied to one side in 2D. I would like to see the convective heat flow from the heated surface.

The error messages I get make me believe that the problem is with defining boundary conditions, but for the life of me I cannot figure out the problem. I've looked at every model and discussion of this problem, but to no avail. I'm hoping the community can show me the way! The model is attached.

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