Richtmyer-Meshkov instability with strong radiatively driven shocks

被引:101
作者
Dimonte, G
Frerking, CE
Schneider, M
Remington, B
机构
[1] Lawrence Livermore Natl. Laboratory, Livermore
关键词
D O I
10.1063/1.871889
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
The Richtmyer-Meshkov instability is investigated with strong radiatively driven shocks (Mach>20, 5Xcompression) using the Nova laser. The target consists of a solid density ablator and lower-density plastics (Atwood number A<0) in planar geometry to facilitate in-flight radiographic diagnosis. Perturbations eta=eta(0) cos kx are imposed at the interface to seed the instability. The experiments agree with full hydrodynamic simulations over a wide variety of conditions. For small initial amplitudes \A\k eta(0)<1, the growth rate agrees with a linear impulsive model using the average of the pre- and post-shock initial amplitudes. For \A\k eta(0)>1, the growth rate is limited to the difference between the transmitted shock speed and the interface speed. (C) 1996 American Institute of Physics.
引用
收藏
页码:614 / 630
页数:17
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