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Time dependent temperature on baundary conditions

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Hello Im new to COMSOL

I have a 2D model for heat transfer where i like to put following baundaries for the temperature dependent on the time. The time dependent are :

T = 291.15 * (t<5h)
1.4*t+293.15*(5h<t<15h)
325.15 * (15h<t<20h)
325.15-1.4*t * (15h<t<20h)

How and where do i put this into the boundery conditions?

1 Reply Last Post 20 nov. 2010, 08:23 UTC−5
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)

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Posted: 1 decade ago 20 nov. 2010, 08:23 UTC−5
Hi

try to set it on your boundary fixed temperature, then when you run a transient simulation simulation that will scan t for you (you must set-up the range

You can also do a stationary analysis, but be aware that COMSOL considers its internal variable t=0 in stationary, so your time dependent BC's must be set accordingly

--
Good luck
Ivar
Hi try to set it on your boundary fixed temperature, then when you run a transient simulation simulation that will scan t for you (you must set-up the range You can also do a stationary analysis, but be aware that COMSOL considers its internal variable t=0 in stationary, so your time dependent BC's must be set accordingly -- Good luck Ivar

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