The effect of a dominant initial single mode on the Kelvin–Helmholtz instability evolution: New insights on previous experimental results

Shimony, Assaf; Shvarts, Dov; Malamud, Guy; Di Stefano, Carlos A.; Kuranz, Carolyn C.; Drake, R. P.

doi:10.1115/1.4032530

Title: The effect of a dominant initial single mode on the Kelvin–Helmholtz instability evolution: New insights on previous experimental results

Journal Article · Tue Apr 12 00:00:00 EDT 2016 · Journal of Fluids Engineering

DOI:https://doi.org/10.1115/1.4032530· OSTI ID:1329897

Shimony, Assaf ^[1]; Shvarts, Dov ^[2]; Malamud, Guy ^[2]; Di Stefano, Carlos A. ^[3]; Kuranz, Carolyn C. ^[4]; Drake, R. P. ^[4]

NRCN (Israel); BGU (Israel)
NRCN, (Israel); Univ. of Michigan, Ann Arbor, MI (United States)
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)

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. Here, we conclude that the KH instability evolution in the experiment is dominated by multimode, vortex-merger dynamics, overcoming the dominant initial mode.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1329897

Report Number(s):: LA-UR-15-26260

Journal Information:: Journal of Fluids Engineering, Vol. 138, Issue 7; ISSN 0098-2202

Publisher:: American Association of Mechanical Engineers (ASME)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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References (15)

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Cited By (2)

Observation of dual-mode, Kelvin-Helmholtz instability vortex merger in a compressible flow Wan, W. C.; Malamud, G.; Shimony, A. Physics of Plasmas, Vol. 24, Issue 5 https://doi.org/10.1063/1.4982061	journal	May 2017
Construction and validation of a statistical model for the nonlinear Kelvin-Helmholtz instability under compressible, multimode conditions Shimony, A.; Wan, W. C.; Klein, S. R. Physics of Plasmas, Vol. 25, Issue 12 https://doi.org/10.1063/1.5060958	journal	December 2018

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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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