scholarly journals Probing the deep nonlinear stage of the ablative Rayleigh-Taylor instability in indirect drive experiments on the National Ignition Facilitya)

2015 ◽  
Vol 22 (5) ◽  
pp. 056302 ◽  
Author(s):  
A. Casner ◽  
L. Masse ◽  
S. Liberatore ◽  
P. Loiseau ◽  
P. E. Masson-Laborde ◽  
...  
Keyword(s):  
Taylor Instability ◽  
Nonlinear Stage ◽  
Indirect Drive ◽  
Rayleigh Taylor Instability

Ablation front Rayleigh-Taylor instability experiments in indirect drive at Phebus facility

2001 ◽  
Author(s):  
Andre L. Richard ◽  
B. Meyer ◽  
P. Salvatore ◽  
Philippe Troussel ◽  
Pascal Munsch ◽  
...  
Keyword(s):  
Taylor Instability ◽  
Indirect Drive ◽  
Rayleigh Taylor Instability ◽  
Ablation Front

scholarly journals Ablation effects in weakly nonlinear stage of the ablative Rayleigh–Taylor instability

1996 ◽  
Vol 14 (1) ◽  
pp. 45-54
Author(s):  
Susumu Hasegawa ◽  
Katsunobu Nishihara
Keyword(s):  
Perturbation Theory ◽  
Mode Coupling ◽  
Wave Amplitude ◽  
Taylor Instability ◽  
Weakly Nonlinear ◽  
Effective Gravity ◽  
Nonlinear Stage ◽  
Excited Wave ◽  
Wave Numbers ◽  
Rayleigh Taylor Instability

Weakly nonlinear stage of the ablative Rayleigh-Taylor instability has been studied by the perturbation theory. Mode coupling of linear growing waves with wave numbers kA and kB drives new excited waves with wave numbers k0 (= kA ± kB, 2kA, 2kB). We have investigated time evolution of the excited waves and found that the ablation effect plays an important role even in the nonlinear stage to reduce amplitude of the excited waves. Differences between an ablation surface and a classical contact surface have been discussed. Dependence of the excited wave amplitude on the wavenumber k0, the ablation velocity va, and the effective gravity g is also investigated.

scholarly journals Nonlinear stage in the development of hydrodynamic instability in laser targets

1990 ◽  
Vol 8 (3) ◽  
pp. 399-407 ◽  
Author(s):  
E. G. Gamaly ◽  
A. P. Favorsky ◽  
A. O. Fedyanin ◽  
I. G. Lebo ◽  
E. E. Myshetskaya ◽  
...  
Keyword(s):  
Growth Rate ◽  
Laser Irradiation ◽  
Hydrodynamic Instability ◽  
Short Wave ◽  
Taylor Instability ◽  
Numerical Code ◽  
Linear Stage ◽  
Nonlinear Stage ◽  
Rayleigh Taylor Instability

The development of hydrodynamic instability in laser targets is studied by means of the 2D numerical code “ATLANT.” At the linear stage, perturbations grow as At the nonlinear stage, the growth rate of Rayleigh-Taylor instability is reduced and new harmonics are generated. The effect of the nonuniformity of laser irradiation has been investigated for long- and shortwave perturbations. The growth rate of short-wave perturbations may be effectively decreased by means of symmetrical prepulses.

Experimental analysis of indirect-drive ablative Rayleigh-Taylor instability on Shenguang Ⅱ

2015 ◽  
Vol 27 (3) ◽  
pp. 32009
Author(s):  
吴俊峰 Wu Junfeng ◽  
缪文勇 Miao Wenyong ◽  
王立锋 Wang Lifeng ◽  
曹柱荣 Cao Zhurong ◽  
郁晓瑾 Yu Xiaojin ◽  
...  
Keyword(s):  
Experimental Analysis ◽  
Taylor Instability ◽  
Indirect Drive ◽  
Rayleigh Taylor Instability

scholarly journals Three-dimensional simulations and analysis of the nonlinear stage of the Rayleigh-Taylor instability

1995 ◽  
Vol 13 (3) ◽  
pp. 423-440 ◽  
Author(s):  
J. Hecht ◽  
D. Ofer ◽  
U. Alon ◽  
D. Shvarts ◽  
S.A. Orszag ◽  
...  
Keyword(s):  
Initial Conditions ◽  
Three Dimensional ◽  
Spherical Geometry ◽  
Taylor Instability ◽  
Three Dimensions ◽  
Type Model ◽  
Late Time ◽  
Nonlinear Stage ◽  
Rayleigh Taylor Instability ◽  
Atwood Number

The nonlinear stage in the growth of the Rayleigh-Taylor instability in three dimensions (3D) is studied using a 3D multimaterial hydrodynamic code. The growth of a single classical 3D square and rectangular modes is compared to the growth in planar and cylindrical geometries and found to be close to the corresponding cylindrical mode, which is in agreement with a new Layzer-type model for 3D bubble growth. The Atwood number effect on the final shape of the instability is demonstrated. Calculations in spherical geometry of the late deceleration stage of a typical ICF pellet have been performed. The different late time shapes obtained are shown to be a result of the initial conditions and the high Atwood number. Finally, preliminary results of calculations of two-mode coupling and random perturbations growth in 3D are presented.

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