City Research Online

Abstract

The present paper focuses on the numerical simulation of the interaction of laser-generated bubbles with a free surface, including comparison of the results with instances from high-speed videos of the experiment. The Volume Of Fluid method was employed for tracking liquid and gas phases while compressibility effects were introduced with appropriate equations of state for each phase. Initial conditions of the bubble pressure were estimated through the traditional Rayleigh Plesset equation. The simulated bubble expands in a non-spherically symmetric way due to the interference of the free surface, obtaining an oval shape at the maximum size. During collapse, a jet with mushroom cap is formed at the axis of symmetry with the same direction as the gravity vector, which splits the initial bubble to an agglomeration of toroidal structures. Overall, the simulation results are in agreement with the experimental images, both quantitatively and qualitatively, while pressure waves are predicted both during the expansion and the collapse of the bubble. Minor discrepancies in the jet velocity and collapse rate are found and are attributed to the thermodynamic closure of the gas inside the bubble.

Publication Type:	Article
Additional Information:	Published by AIP, "Koukouvinis, P., Gavaises, M., Supponen, O. & Farhat, M. (2016). Simulation of bubble expansion and collapse in the vicinity of a free surface. Physics of Fluids, 28(5), 052103". The version of record can be found here http://dx.doi.org/10.1063/1.4949354
Publisher Keywords:	Numerical simulation, compressible bubble dynamics, bubble interaction with free surface, interface capturing, cavitation
Subjects:	T Technology > TJ Mechanical engineering and machinery
Departments:	School of Science & Technology > Engineering
SWORD Depositor:	Symplectic Administrator

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