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Phase Change in VOF Evaporation/Condensation Models

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Old   April 12, 2017, 20:51
Default Phase Change in VOF Evaporation/Condensation Models
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Ramon Yoshiura
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I am currently working on a project that condenses steam in a closed vessel using Star CCM+ 9.04.001-R8 and having problems with phase change.

The physical models chosen are implicit unsteady, Eulerian Multiphase VOF, turbulent, Multiphase Interaction, gravity, segregated fluid temperature, and Evaporation/Condensation options selected.
The continuum is fluid with two Eulerian phases; steam and water. The material properties have been modified to match pressure and temperature conditions.

The problem is set up to have the vessel initially filled by steam at 400 K with pressure at 14.7 psi and surrounded by walls at 300 K.
The issue is that even though the temperature of the fluid is shifting from 400 K to 300 K as each time step is satisfied, phase change does not occur. If the pressure is 14.7 psi, the saturation pressure should be 373 K and phase should be occurring at this point.

Is there any suggestions to have phase change occur??
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Old   September 1, 2017, 07:32
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Do you have found any solution for that?
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Old   May 7, 2018, 13:49
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Can you please tell me how you used single components and not multi-components in order to use the evaporation model?!

I can only use it with multi components. If I do not specify a mixture in the gas star will not run.
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Old   March 21, 2019, 08:12
Talking Condensation problem
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Almir Guilherme
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Have you get the results? becaus I am doing a VOF condensation and It is not working? Any can help me?
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condensation, phase change, star ccm+, vof

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