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Stop Joule heating and start cooling.

Posted 11 nov 2012, 16:18 GMT-5 Heat Transfer & Phase Change Version 4.2, Version 4.2a, Version 4.3, Version 4.3a 2 Replies

Ivaylo Ivanov
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Hello, I am trying to simulate Joule heating model in Comsol multiphysycs heat transfer module. I want to use joule heating till the 19 sec. After 19 I want to stop JH and continue convective cooling till 240 sec. For the moment I just did joule heating to 19 sec. Tried to use 2 step solver but it doesn't obtain. If anyone can help me I will appreciate it. Thank you !
2 Replies Last Post 12 nov 2012, 14:14 GMT-5
Nagi Elabbasi Facebook Reality Labs
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Posted: 1 decade ago 11 nov 2012, 19:00 GMT-5
Multiple steps should work but is not necessary. You can change the heat source to be its original setting times (t<19.0). That expression evaluates to zero at times greater than 19.
Multiple steps should work but is not necessary. You can change the heat source to be its original setting times (t
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 12 nov 2012, 14:14 GMT-5
Hi

one thing to add: if you run a standard, single, time series then be sure you have two ranges of time steps, so that you restart with small steps from t>19 and increase them the thereafter.
As well as using an "intermediate" or "strict" time "stepping" as you might see the solver will take larger steps after somw 10-15 sec and then miss somewhat the transient of you stopping the Joule heating at t=19

--
Good luck
Ivar
Hi one thing to add: if you run a standard, single, time series then be sure you have two ranges of time steps, so that you restart with small steps from t>19 and increase them the thereafter. As well as using an "intermediate" or "strict" time "stepping" as you might see the solver will take larger steps after somw 10-15 sec and then miss somewhat the transient of you stopping the Joule heating at t=19 -- Good luck Ivar

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