论文信息 - Rayleigh-Taylor and Kelvin-Helmholtz instabilities in targets accelerated by laser ablation

Rayleigh-Taylor and Kelvin-Helmholtz instabilities in targets accelerated by laser ablation

Abstract : Using the FAST2D laser-shell simulation model we have accelerated a 20 micrometer thick plastic foil up to 160 km/s. The foil maintained its integrity up to 10 ns giving an aspect ratio of 40. We are able to follow the Rayleigh-Taylor bubble-and-spike development far into the nonlinear regime and beyond the point of foil fragmentation. Strong shear flow develops at the interface between the bubble-and-spike which leads to the development of the Kelvin-Helmholtz instability. The K-H instability causes the tips of the spikes to widen and as a result reduce their rate of 'fall.' (Author)

J. Boris | J. Gardner | M. Emery

[1] Francis H. Harlow,et al. Numerical Study of Large‐Amplitude Free‐Surface Motions , 1966 .

[2] G. Taylor. The instability of liquid surfaces when accelerated in a direction perpendicular to their planes. I , 1950, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[3] Robert L. McCrory,et al. Nonlinear Evolution of Ablation-Driven Rayleigh-Taylor Instability , 1981 .

[4] B. J. Daly. Numerical Study of Two Fluid Rayleigh‐Taylor Instability , 1967 .

[5] Steven A. Orszag,et al. Vortex simulations of the Rayleigh–Taylor instability , 1980 .

[6] J. Larmor,et al. Hydrodynamics and general dynamics , 1910 .