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Problem with heat transfer model

Posted 2011年11月15日 GMT-5 09:31 Heat Transfer & Phase Change Version 4.2 1 Reply

Estefania Arevalo
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Hi i have i problem with a heat transfer polygon, the thing is that i put a thermal insulation, but i don't know why the temperature in all the polygon is the one i put as the exterior
1 Reply Last Post 2011年11月15日 GMT-5 13:05
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 2011年11月15日 GMT-5 13:05
Hi

if you have an isolated object and except for one side, and you do a stationary study you will en up at the same temperature everywhere, you constant T boundary will provide or extract the amount required to stabilise the temperature, and in stationary you wait an "infinite " long time.
If you solve in temporal, you will see the temperature change gently depending on the thermal diffusivity alpha = k/rho/Cp your model size and the time steps you choose

There is one case where noting happens in time and statioanry solving. It is when the intial temperature is set to T0, and your control boundary is set to the same value T0

--
Good luck
Ivar
Hi if you have an isolated object and except for one side, and you do a stationary study you will en up at the same temperature everywhere, you constant T boundary will provide or extract the amount required to stabilise the temperature, and in stationary you wait an "infinite " long time. If you solve in temporal, you will see the temperature change gently depending on the thermal diffusivity alpha = k/rho/Cp your model size and the time steps you choose There is one case where noting happens in time and statioanry solving. It is when the intial temperature is set to T0, and your control boundary is set to the same value T0 -- Good luck Ivar

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