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

Abstract

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.

Authors:
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)
Publication Date:
Research Org.:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10)
OSTI Identifier:
1444110
Alternate Identifier(s):
OSTI ID: 1361851
Grant/Contract Number:  
NA0003527; NA0002719; NA0002956; AC52-07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 5; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Wan, W. C., Malamud, Guy, Shimony, A., Di Stefano, C. A., Trantham, M. R., Klein, S. R., Shvarts, D., Drake, R. P., and Kuranz, C. C. Observation of dual-mode, Kelvin-Helmholtz instability vortex merger in a compressible flow. United States: N. p., 2017. Web. doi:10.1063/1.4982061.
Wan, W. C., Malamud, Guy, Shimony, A., Di Stefano, C. A., Trantham, M. R., Klein, S. R., Shvarts, D., Drake, R. P., & Kuranz, C. C. Observation of dual-mode, Kelvin-Helmholtz instability vortex merger in a compressible flow. United States. doi:10.1063/1.4982061.
Wan, W. C., Malamud, Guy, Shimony, A., Di Stefano, C. A., Trantham, M. R., Klein, S. R., Shvarts, D., Drake, R. P., and Kuranz, C. C. Tue . "Observation of dual-mode, Kelvin-Helmholtz instability vortex merger in a compressible flow". United States. doi:10.1063/1.4982061. https://www.osti.gov/servlets/purl/1444110.
@article{osti_1444110,
title = {Observation of dual-mode, Kelvin-Helmholtz instability vortex merger in a compressible flow},
author = {Wan, W. C. and Malamud, Guy and Shimony, A. and Di Stefano, C. A. and Trantham, M. R. and Klein, S. R. and Shvarts, D. and Drake, R. P. and Kuranz, C. C.},
abstractNote = {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.},
doi = {10.1063/1.4982061},
journal = {Physics of Plasmas},
issn = {1070-664X},
number = 5,
volume = 24,
place = {United States},
year = {2017},
month = {4}
}

Journal Article:
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