Hello, I am modelling a heat transfer problem, and the details are: when the temperature increases to 315K, heating is stopped; however, when temperature drops belows 310K, heating restarted. If the upper and lower bound temperatures are the same, it can be easily solved by step function. i want to ask how to describe temperature increase phase in Comsol. I tried to define a step function of Tt, and with this function to differentiate the heating up and cooling down processes. however, an error message poped out: Failed to evaluate variable Jacobian. Can anyone suggest some ways to solve this? Thanks a lot.
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