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Phase change: freezing and convergence problem
Posted 2013年8月21日 GMT-4 06:22 Heat Transfer & Phase Change 0 Replies
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I'm currently working on a water solution freezing model including the phase change.
I use the COMSOL model : www.comsol.com/model/phase-change-474
Geometry:
I just add a metal part below the water. I impose T_bottom at the base of this metal part.
Definitions:
Then I changed some parameters according to my experiment:
T_trans = -10°C
T_i = -5°C
T_f= -15°C
T_bottom= from T-i to T_f, in 600 seconds
H = from 1 to 0 (volume fraction of water = theta_water)
D becomes < 0 (by definition)
I have one question and one problem:
The question: In Cp_ water and Cp_ice definitions, shall I change the sign before D(T)*lm ? Is it the same for both ? (I noticed a mistake in the tutorial page 12 where they call Rho_ice the density of water)
The problem: I tried different possibilities, unfortunately, it never converges... Even after few days...
Experimentally, I observed an increase of the T°C during the freezing which is coming from the phase change. I would to show it by model.
Does anybody has an idea to adapt the melting model of COMSOL to the freezing one ?
Thanks a lot,
Jb
Hello Jean Baptiste Sauvet
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