Observation of dual-mode, Kelvin-Helmholtz instability vortex merger in a compressible flow
- Univ. of Michigan, Ann Arbor, MI (United States)
- Univ. of Michigan, Ann Arbor, MI (United States); Nuclear Research Center, Negev (Israel)
- Nuclear Research Center, Negev (Israel); Ben Gurion Univ. of the Negev, Beer-Sheva (Israel)
- Univ. of Michigan, Ann Arbor, MI (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- 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
Web of Science
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