I'm using Marc to simulate the moving heat flux applied to the plate. The maximum temperature reached and cooling curve seems reasonable but there is an initial dip down in the temperature just before rising up. Initially, I was using first-order elements hex8 at the beginning. I tried using second-order elements hex20 but then the external heat flux is so weird. And there is a whole spectrum of flux moving up and down as waves. I also tried making the mesh finer, the time period for the dip in the temperature is less but there is still a dip.
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