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Large enthalpy values can produce errors in transient thermal simulations for several reasons. One possible cause is inadequate convergence of the energy equation. In nonlinear analysis, you must specify a small enough integration time step for the solution. It is necessary to turn on automatic time stepping so that the program can adjust the time step before, during, and after the phase change like that:
Another factor to consider is the solver being used. For instance, in a transient thermal simulation involving phase change, if the default Quasi Static solver is selected, it will not take into account enthalpy calculations. To address this, the solver option must be manually set to Full Newton-Raphson for the enthalpy to be considered:
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