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Solving transient heat transfer, how can I control the time step size as a function of a local temperature from the former time step?
Posted 6 set 2019, 17:07 GMT-4 Heat Transfer Version 5.4 1 Reply
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Hi guys,
I am trying to solve a transient heat transfer problem with phase change. When the temperature gets around the phase change point, I need to shorten the time step size to avoid fluctuation. Is it possible to get one temperature from each time step as a global variable? And then use the global variable as the input to the time step size function?
Thanks in advance, Tianyu
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Hi Tianyu, An easier solution is to tell the solver to "take care" when a certain event, such as a maximum temperature or another global quantity, is encountered. To this end you can define the global quantity in Definitions and use it in the Events Interface.
When an Event is encountered, the solver will take an extremely small time step automatically. Here is a good illustration of this idea. https://www.comsol.com/blogs/implementing-a-thermostat-with-the-events-interface/
Hopefully you can follow from that. If not contact the support team with specific details on your modeling problem.
Cheers, Temesgen
-------------------We all have opinions. But the COMSOL support team has the truth. I don't know if my opinion is still the truth. Check with that team before you try this at home!