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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

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.
Authors:
 [1] ;  [2] ;  [2] ;  [3] ;  [4] ;  [4]
  1. NRCN (Israel); BGU (Israel)
  2. NRCN, (Israel); Univ. of Michigan, Ann Arbor, MI (United States)
  3. Univ. of Michigan, Ann Arbor, MI (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Univ. of Michigan, Ann Arbor, MI (United States)
Publication Date:
OSTI Identifier:
1329897
Report Number(s):
LA-UR--15-26260
Journal ID: ISSN 0098-2202
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Journal of Fluids Engineering
Additional Journal Information:
Journal Volume: 138; Journal Issue: 7; Journal ID: ISSN 0098-2202
Publisher:
American Association of Mechanical Engineers (ASME)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS wavelength; computer simulation; simulation; waves; shear (mechanics); vortices; dynamics (mechanics); flow (dynamics)