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.
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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 3.4.3.2 of the Thermal Analysis Guide has been exceeded. |
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