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VOF, Boiling, When surface tension = f(T), Spurious currents appears

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Old   June 6, 2020, 04:19
Default VOF, Boiling, When surface tension = f(T), Spurious currents appears
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hello,

I am simulating a pool boiling problem, I am using the VOF method and inbuilt phase change module. It works fine, but a soon as I use surface tension as a function of temperature, spurious currents appear at the interface 11111.PNG.

any help would be highly appreciated
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Old   June 7, 2020, 10:04
Default Surface Tension Modeling
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This is an artifact of surface tension modeling, usually with CSF approach. Try using CSS instead. Furthermore, if Ca is very low, you might require very fine mesh or LSM so that curvature is predicted correctly for surface tension modeling.
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Old   June 9, 2020, 02:14
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Quote:
Originally Posted by vinerm View Post
This is an artifact of surface tension modeling, usually with CSF approach. Try using CSS instead. Furthermore, if Ca is very low, you might require very fine mesh or LSM so that curvature is predicted correctly for surface tension modeling.
CSS did not work eithercss.PNG. Read somewhere, LSM + VOF does not work for phase change in Fluent. Will try refining mesh further.
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