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temperature dependent time

Posted 24 oct. 2014, 14:01 UTC−4 2 Replies

Kader Kadouri
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Hello Im new in COMSOL

I have a 2D model for solidification where i like to put following baundaries for the temperature dependent on the time:

T(t)=533-0.03*t (kelvin)
temperature = 533 Kelvin
cooling rate =0.03 K/s
t= time (second)

thank you in advance
2 Replies Last Post 26 oct. 2014, 14:19 UTC−4
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 25 oct. 2014, 04:23 UTC−4
Hi

set a "Temperature boundary condition" node over the boundary you want to control, and write out your equation diretly like that:

533[K]-0.03[K/s]*t

"t" is defined by default in COMSOL if you call in the time solver

if you do not give the units in [ ] your formula will flag orange = WARNING unit inconsistency, but that is no error, just a warning that COMSOL cannot check that the units are consistent. Therefore I always add units, it helps me too to check that I'm writing out the formulas correctly

--
Good luck
Ivar
Hi set a "Temperature boundary condition" node over the boundary you want to control, and write out your equation diretly like that: 533[K]-0.03[K/s]*t "t" is defined by default in COMSOL if you call in the time solver if you do not give the units in [ ] your formula will flag orange = WARNING unit inconsistency, but that is no error, just a warning that COMSOL cannot check that the units are consistent. Therefore I always add units, it helps me too to check that I'm writing out the formulas correctly -- Good luck Ivar
Kader Kadouri
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Posted: 1 decade ago 26 oct. 2014, 14:19 UTC−4
thank's ivar
A+
thank's ivar A+

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