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Title: Observation of dual-mode, Kelvin-Helmholtz instability vortex merger in a compressible flow

Journal Article · · Physics of Plasmas
DOI: https://doi.org/10.1063/1.4982061 · OSTI ID:1444110
ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [4];  [1];  [1];  [5]; ORCiD logo [1];  [1]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Univ. of Michigan, Ann Arbor, MI (United States); Nuclear Research Center, Negev (Israel)
  3. Nuclear Research Center, Negev (Israel); Ben Gurion Univ. of the Negev, Beer-Sheva (Israel)
  4. Univ. of Michigan, Ann Arbor, MI (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  5. Univ. of Michigan, Ann Arbor, MI (United States); Nuclear Research Center, Negev (Israel); Ben Gurion Univ. of the Negev, Beer-Sheva (Israel)

Here, we report the first observations of Kelvin-Helmholtz vortices evolving from well-characterized, dual-mode initial conditions in a steady, supersonic flow. The results provide the first measurements of the instability's vortex merger rate and supplement data on the inhibition of the instability's growth rate in a compressible flow. These experimental data were obtained by sustaining a shockwave over a foam-plastic interface with a precision-machined seed perturbation. This technique produced a strong shear layer between two plasmas at high-energy-density conditions. The system was diagnosed using x-ray radiography and was well-reproduced using hydrodynamic simulations. Experimental measurements imply that we observed the anticipated vortex merger rate and growth inhibition for supersonic shear flow.

Research Organization:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)
Grant/Contract Number:
NA0003527; NA0002719; NA0002956; AC52-07NA27344
OSTI ID:
1444110
Alternate ID(s):
OSTI ID: 1361851
Journal Information:
Physics of Plasmas, Vol. 24, Issue 5; ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

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Cited By (6)

Shock-driven discrete vortex evolution on a high-Atwood number oblique interface journal March 2018
Shock-driven hydrodynamic instability of a sinusoidally perturbed, high-Atwood number, oblique interface journal June 2019
Construction and validation of a statistical model for the nonlinear Kelvin-Helmholtz instability under compressible, multimode conditions journal December 2018
Turbulent mixing and transition criteria of flows induced by hydrodynamic instabilities journal August 2019
From ICF to laboratory astrophysics: ablative and classical Rayleigh–Taylor instability experiments in turbulent-like regimes journal December 2018
Late-time mixing and turbulent behavior in high-energy-density shear experiments at high Atwood numbers journal May 2018

Figures / Tables (6)