Learning Forum

[dickoulianovngampo]

I have an enthalpy table, and a time increment of (1st 6000s and 2nd phase 10000s), as soon as I insert it into Ansys thermal transient I have an error. If I reduce the enthalpy values ​​(by dividing by 10) it works. 
my question is, how to keep the same values ​​and not reduce them so that it works on ansys

 

[Lydia Lymperopoulou]

Hello,

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:

[dickoulianovngampo]

Thank you very much for your help, I tried it but still got the error with large values. Are there no other parameters to take into account?

[stuartheccleston]

For proper solver setup and time step adjustment to avoid errors. This topic is important for poppy playtime chapter 3 users dealing with phase changes, as it emphasizes the need for careful configuration to ensure accurate and stable simulations.

[blamirvelasco2]

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