I perform an axi-symetric simulation of a buoyant bubble beneath a free surface. The bubble rises and coalesces with the free surface because of buoyancy.
I need the bubble to reach its terminal velocity before bouncing on the interface. However, it is computationally very costly to make the bubble reach its terminal velocity because the mesh needs to be very fine close to the flat interface.
My question is : it possible to impose to the bubble its terminal velocity as an initial condition to the simulation?
The bubble interface is captured with a level set method, and the simulation is performed on a cartesian grid.
Thank you a lot,
Omer
Omer,
Take a look at this paper (paragraph 4.2) :
A single bubble, rising in an initially quiescent fluid due to the effects of buoyancy has been successfully simulated.
https://www.math.uzh.ch/fileadmin/math/preprints/03-04.pdf
I hope it can help you.
Regards
Hi Omer,
During the bobble rise, shape of the bobble and the velocity pattern of air and water around the bobble change, so non-zero velocity at the initial condition, practically is impossible I think .
Hi Omer,
Comsol Multiphysics has an example of rising bubble of oil in water phase. The bubble rises in the water phase and when it reaches the liquid-liquid interface it merges with the oil phase.
Regards
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