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Title: Observation and modeling of mixing-layer development in high-energy-density, blast-wave-driven shear flow

In this work, we examine the hydrodynamics of high-energy-density (HED) shear flows. Experiments, consisting of two materials of differing density, use the OMEGA-60 laser to drive a blast wave at a pressure of ∼50 Mbar into one of the media, creating a shear flow in the resulting shocked system. The interface between the two materials is Kelvin-Helmholtz unstable, and a mixing layer of growing width develops due to the shear. To theoretically analyze the instability's behavior, we rely on two sources of information. First, the interface spectrum is well-characterized, which allows us to identify how the shock front and the subsequent shear in the post-shock flow interact with the interface. These observations provide direct evidence that vortex merger dominates the evolution of the interface structure. Second, simulations calibrated to the experiment allow us to estimate the time-dependent evolution of the deposition of vorticity at the interface. The overall result is that we are able to choose a hydrodynamic model for the system, and consequently examine how well the flow in this HED system corresponds to a classical hydrodynamic description.
Authors:
; ; ;  [1] ;  [1] ;  [2] ; ;  [3] ; ;  [4] ;  [2] ; ;  [5]
  1. Department of Atmospheric, Oceanic, and Space Sciences, University of Michigan, Ann Arbor, Michigan 48109 (United States)
  2. (Israel)
  3. Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan 48109 (United States)
  4. Department of Physics, Nuclear Research Center-Negev, Beer-Sheva (Israel)
  5. Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551 (United States)
Publication Date:
OSTI Identifier:
22252936
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 21; Journal Issue: 5; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; DENSITY; ENERGY DENSITY; HYDRODYNAMIC MODEL; INTERFACES; LAYERS; MIXING; SHEAR; SIMULATION; TIME DEPENDENCE