Why does this transient thermal analysis undershoot the temperature boundary conditions? The model is given a 28 degC initial condition and has convection to negative 140 degC and convection to 28 degC. When it is solved, there are regions that reach temperatures of over 1000 degC.

It is quite common for thermal models to overshoot or undershoot the boundary conditions. In a transient analysis, the most common reason is that mid-side nodes have been used and the maximum integration time step recommended in Section of the Thermal Analysis Guide has been exceeded.

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