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Ch. Lechner, M. Koch, W. Lauterborn, R. Mettin:
"Details of the collapse of a cavitation bubble next to a flat, rigid wall";
Vortrag: 10th International Symposium on Cavitation (CAV2018), Baltimore, MD, USA; 14.05.2018 - 16.05.2018; in: "Proceedings of the 10th International Symposium on Cavitation (CAV2018)", J. Katz (Hrg.); ASME, (2018), 5 S.

A detailed numerical study of a single
laser-induced cavitation bubble that is generated
next to a flat, solid wall under normal ambient conditions is presented.
For the numerical simulation a compressible two-phase solver of the
finite volume software package OpenFOAM has been adapted for
our purpose.
Bubbles with an initial normalized
distance $\gamma$ from the wall in the range $\gamma \in [1.02,1.5]$
are simulated.
The investigation focuses on the dynamics of the liquid-on-liquid
impact of the micro-jet, the splitting of the resulting torus bubble
into several ring-like bubbles and their subsequent collapse.
Details of the dynamics of the bubble at and after jet-impact, including the
formation of an annular sheet-like "nano-jet" are presented.
Pressure waves emanating from jet-impact and collapse are described.
The influence of the initial distance from the wall on the
above described phenomena is investigated.
In particular, jet velocities and the maximum pressure at jet-impact
are given for this range of normalized distances.

bubble dynamics, microjet, pressure waves, volume of fluid method

http://dx.doi.org/10.1115/1.861851_ch55