The Effect of a Dominant Initial Single Mode on the Kelvin–Helmholtz Instability Evolution: New Insights on Previous Experimental Results

This paper brings new insights on an experiment, measuring the Kelvin–Helmholtz (KH) instability evolution, performed on the OMEGA-60 laser facility. Experimental radiographs show that the initial seed perturbations in the experiment are of multimode spectrum with a dominant single-mode of 16 μm wav...

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Veröffentlicht in:Journal of fluids engineering 2016-07, Vol.138 (7)
Hauptverfasser: Shimony, Assaf, Shvarts, Dov, Malamud, Guy, Di Stefano, Carlos A., Kuranz, Carolyn C., Drake, R. P.
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container_issue 7
container_start_page
container_title Journal of fluids engineering
container_volume 138
creator Shimony, Assaf
Shvarts, Dov
Malamud, Guy
Di Stefano, Carlos A.
Kuranz, Carolyn C.
Drake, R. P.
description This paper brings new insights on an experiment, measuring the Kelvin–Helmholtz (KH) instability evolution, performed on the OMEGA-60 laser facility. Experimental radiographs show that the initial seed perturbations in the experiment are of multimode spectrum with a dominant single-mode of 16 μm wavelength. In single-mode-dominated KH instability flows, the mixing zone (MZ) width saturates to a constant value comparable to the wavelength. However, the experimental MZ width at late times has exceeded 100 μm, an order of magnitude larger. In this work, we use numerical simulations and a statistical model in order to investigate the vortex dynamics of the KH instability for the experimental initial spectrum. We conclude that the KH instability evolution in the experiment is dominated by multimode, vortex-merger dynamics, overcoming the dominant initial mode.
doi_str_mv 10.1115/1.4032530
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source ASME Transactions Journals (Current); Alma/SFX Local Collection
subjects CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
computer simulation
dynamics (mechanics)
flow (dynamics)
shear (mechanics)
simulation
vortices
wavelength
waves
title The Effect of a Dominant Initial Single Mode on the Kelvin–Helmholtz Instability Evolution: New Insights on Previous Experimental Results
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