Solid-liquid phase change

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Martin2000
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Solid-liquid phase change

Post by Martin2000 » 06 Jan 2016, 15:22

Hi Elmer users,

I wanted to simulate the phase change of water from liquid to solid with the enthalpy method. I am not sure, if I get the right input parameters because the time until phase change is happening is very short, so it would be nice if anybody who is practised in phase change simulations could take a look at the sif. First I had also Problems with the convergence tolerance. I solved this problem in decreasing the nonlinear relaxation factor to 0.25. My Problem is in 2D and the water is in a ractangular box with the size of 0.25*0.5 m.

I appreciate any hints.

Yours sincerely, Martin.
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raback
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Re: Solid-liquid phase change

Post by raback » 06 Jan 2016, 21:33

Hi

For various phase change strategies the test case of Julien may be very usefull. See,
viewtopic.php?f=3&t=3846&start=0&hilit=phase+change

-Peter

XisZero
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Re: Solid-liquid phase change

Post by XisZero » 08 Jan 2016, 19:32

Hi Martin,

As far as i can see in your SIF, the Enthalpy is way too small.
I dont know what values you are using, but try with multiplying by 1000 as the unit of enthalpy should be J/m^3 . (333 kJ / kg, density = 1000 kg/m^3 --> 333 MJ/m^3).
Your cp is in J/kg K i think?

In addition to Peters link, you could take a look at a phase change UDF i have written for some tests:
viewtopic.php?f=3&t=3639

Hope it helps.

Greetings,

X=0

Martin2000
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Re: Solid-liquid phase change

Post by Martin2000 » 29 Feb 2016, 21:18

Hi XisZero,
thank you for your response.
Are you sure, that the unit of the enthalpy is J/m³?
After having simulated it with the new values (in J/m³), I think, the time until Phase Change is very long (about 13-16 h).
I appreciate any hints.

Yours sincerely, Martin.

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