Nonlinear effects of multifrequency hydrodynamic instabilities on ablatively accelerated thin shells

Journal Article · Wed Sep 01 04:00:00 EDT 1982 · Phys. Fluids; (United States)

DOI:https://doi.org/10.1063/1.863925· OSTI ID:5118989

Verdon, C P; McCrory, R L; Morse, R L; Baker, G R; Meiron, D I; Orszag, S A

Two-dimensional numerical simulations of ablatively accelerated thin-shell fusion targets, susceptible to rupture and failure by Rayleigh--Taylor instability, are presented. The results show that nonlinear effects of Rayleigh--Taylor instability are manifested in the dynamics of the ''bubble'' (head of the nonlinear fluid perturbation) rather than in the dynamics of the spike (tail of the perturbation). The role of multiwavelength perturbations on the shell is clarified, and rules are presented to predict the dominant nonlinear mode-mode interactions which limit shell performance. It is also shown that the essential dynamics of strongly driven flows are governed by the classical Rayleigh--Taylor instability of an ideal, incompressible, thin fluid layer.

• Research Organization: Laboratory for Laser Energetics, College of Engineering and Applied Science, University of Rochester, Rochester, New York 14623
• OSTI ID: 5118989
• Journal Information: Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 25:9; ISSN PFLDA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700107* -- Fusion Energy-- Plasma Research-- Instabilities
700208 -- Fusion Power Plant Technology-- Inertial Confinement Technology
ABLATION
ACCELERATION
BUBBLES
DATA
DYNAMICS
FLUIDS
INFORMATION
INSTABILITY
LAYERS
MECHANICS
NONLINEAR PROBLEMS
NUMERICAL DATA
RAYLEIGH-TAYLOR INSTABILITY
SHELLS
SIMULATION
TARGETS
TWO-DIMENSIONAL CALCULATIONS