The bubble coalescence method using VOFM

[Moxing529]

Hello, Dr. Karnakov. I noticed a bubble coalescence phenomenon in the VOFM method, where two bubbles appear to merge but, in fact, only mix as two different-colored bubbles. Could you help explain the cause of this effect? Could this be considered true bubble coalescence?Additionally, is it possible to achieve natural bubble coalescence using the VOFM method?

[pkarnakov]

When two bubbles merge like this, it is not true coalescence but rather an artifact of low resolution. To achieve actual coalescence you can either switch to the original VOF method, or there is actually a parameter in the configuration which can trigger coalescence for overlapping bubbles, so this may work (should be added to add.conf in the simulation directory)

# Coalescence is triggered the sum of volume fractions exceeds this value:
set double vofm_coalth 1.5

[Moxing529]

Oh! Thank you so much, Dr. Karnakov!