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Nonlinear mixing behavior of the three-dimensional Rayleigh–Taylor instability at a decelerating interface

Phys. Plasmas 11, 2829 (2004); doi:10.1063/1.1651492

Published 23 April 2004

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R. P. Drake, D. R. Leibrandt, E. C. Harding, C. C. Kuranz, and M. A. Blackburn
University of Michigan, Atmospheric Oceanic and Space Sciences, 2455 Hayward Street, Ann Arbor, Michigan 48109-2143

H. F. Robey, B. A. Remington, M. J. Edwards, A. R. Miles, T. S. Perry, R. J. Wallace, and H. Louis
Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94550

J. P. Knauer
University of Rochester, 250 East River Road, Rochester, New York 14623

D. Arnett
University of Arizona, 5333 N. Camino Real, Tucson, Arizona 85718
Results are reported from the first experiments to explore the evolution of the Rayleigh–Taylor (RT) instability from intentionally three-dimensional (3D) initial conditions at an embedded, decelerating interface in a high-Reynolds-number flow. The experiments used ~5 kJ of laser energy to produce a blast wave in polyimide and/or brominated plastic having an initial pressure of ~50 Mbars. This blast wave shocked and then decelerated the perturbed interface between the first material and lower-density C foam. This caused the formation of a decelerating interface with an Atwood number ~2/3, producing a long-term positive growth rate for the RT instability. The initial perturbations were a 3D perturbation in an "egg-crate" pattern with feature spacings of 71 µm in two orthogonal directions and peak-to-valley amplitudes of 5 µm. The resulting RT spikes appear to overtake the shock waves, moving at a large fraction of the predeceleration, "free-fall" velocity. This result was unanticipated by prior simulations and models. ©2004 American Institute of Physics.
History: Received 31 October 2003; accepted 6 January 2004; published 23 April 2004
Permalink: http://link.aip.org/link/?PHPAEN/11/2829/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.35.Py
    Plasma macroinstabilities (hydromagnetic) e.g., kink, fire-hose, mirror, ballooning, tearing, trapped-particle, flute, Rayleigh-Taylor instabilities, etc
  • 52.30.-q
    Plasma dynamics and flow
  • 52.35.Tc
    Shock waves and discontinuities in plasma
  • 52.50.Lp
    Plasma production and heating by shock waves and compression
  • 52.35.Ra
    Plasma turbulence
  • YEAR: 2004

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PUBLICATION DATA

ISSN:
1070-664X (print)   1089-7674 (online)
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