Why does evaluateHeatRate in PDE Solver give different answers depending on mesh size?
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I have a simple half-space 2D thermal model with a top surface at 0, a specified heat flux at the bottom, insulated sides, and a hot rectangular body on the left size. I am interested in the total thermal energy lost from the body in a given time, and therefor sum the results of evaluateHeatRate for the top, right, and bottom edges of the hot rectangle. If I use the default mesh generation I get one (reasonable) number, but if I make the mesh significantly finer by setting Hmax, the calculated heat lost goes up by a factor of two. It keeps rising as I made the mesh finer and finer. Any suggestions as to why this is happening appreciated.
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