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

rupak504 · June 6, 2020, 03:19

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

vinerm · June 7, 2020, 09:04

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.

rupak504 · June 9, 2020, 01:14

Quote:

Originally Posted by vinerm

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.

June 6, 2020, 03:19	VOF, Boiling, When surface tension = f(T), Spurious currents appears	#1
rupak504 Senior Member Lolita Join Date: Aug 2016 Posts: 115 Rep Power: 9	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

June 7, 2020, 09:04	Surface Tension Modeling	#2
vinerm Senior Member Vinerm Join Date: Jun 2009 Location: Nederland Posts: 2,946 Blog Entries: 1 Rep Power: 35	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. __________________ Regards, Vinerm PM to be used if and only if you do not want something to be shared publicly. PM is considered to be of the least priority.

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