[Zurück]

M. Koch, Ch. Lechner, R. Mettin, W. Lauterborn:
"CFD Simulation of the Nonlinear Dynamics of Laser-generated Cavitation Bubbles";
Vortrag: Conference on Modelling Flud Flow - CMFF'18, Budapest; 04.09.2018 - 07.09.2018; in: "Conference on Modelling Fluid Flow - CMFF'18", J. Vad (Hrg.); (2018), ISBN: 978-963313297-5; 5 S.

Since quite some decades the collapse of a cavitation bubble in front of a solid boundary is object of investigation. The physics behind this issue covers the fields of complex fluid dynamics,
plasma physics, nonlinear acoustics, as well as non-equilibrium, two-phase thermodynamics. The history of modelling bubble dynamics started with reduced analytical models for spherical bubbles almost
exactly a hundred years ago. When computational
power increased, the boundary element method was
introduced to study bubbles near boundaries, but
mostly with incompressible formulations. Nowadays, advanced computational methods are able to
resolve details on microsecond and even nanosecond
time scales. One example of the relatively complex
dynamical processes is the splitting of the collapsing
bubble into several torus bubble rings, that has been
observed in experiments many times. From the finite volume simulations with a specialized two-phase
solver we deduce that three phenomena are responsible for this splitting, that we call the "Blake splash",
the "nanojet" and "microjet feed".