2017
DOI: 10.1017/jfm.2017.664
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Evaluation of turbulent mixing transition in a shock-driven variable-density flow

Abstract: The effect of initial conditions on transition to turbulence is studied in a variable-density shock-driven flow. Richtmyer–Meshkov instability (RMI) evolution of fluid interfaces with two different imposed initial perturbations is observed before and after interaction with a second shock reflected from the end wall of a shock tube (reshock). The first perturbation is a predominantly single-mode long-wavelength interface which is formed by inclining the entire tube to 80$^{\circ }$ relative to the horizontal, y… Show more

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Cited by 60 publications
(59 citation statements)
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“…Characterizing the turbulent mixing requires high-resolution temporal and spatial measurements of both the density and velocity fields. The simultaneous planar laser-induced fluorescence (PLIF) and particle image velocimetry (PIV) measurements have been used to collect density and velocity data from shock-induced mixing problems in many previous studies [13][14][15][16][17]. However, the method is only limited to the measurements of the fields in a two-dimensional plane and data of other important quantities such as pressure and temperature are still out of reach.…”
Section: Introductionmentioning
confidence: 99%
“…Characterizing the turbulent mixing requires high-resolution temporal and spatial measurements of both the density and velocity fields. The simultaneous planar laser-induced fluorescence (PLIF) and particle image velocimetry (PIV) measurements have been used to collect density and velocity data from shock-induced mixing problems in many previous studies [13][14][15][16][17]. However, the method is only limited to the measurements of the fields in a two-dimensional plane and data of other important quantities such as pressure and temperature are still out of reach.…”
Section: Introductionmentioning
confidence: 99%
“…The perturbations grow linearly until their amplitudes become comparable to their wavelengths. Eventually, the interface develops into a turbulent mixing layer (Mohaghar et al 2017;Zhou 2017). The RM instability has become increasingly significant in many areas of scientific research such as inertial confinement fusion (ICF) (Lindl et al 2014), supersonic combustion (Yang, Kubota & Zukoski 1993) and astrophysical problems (Arnett et al 1989), and several comprehensive reviews on the RM instability have been made (Zabusky 1999;Brouillette 2002;Ranjan, Oakley & Bonazza 2011;Luo et al 2014b).…”
Section: Introductionmentioning
confidence: 99%
“…In addition to the above characterization of the mixing zone, the analysis of its turbulent transition was also conducted based on transition criteria as defined in the literature (see Dimotakis [22] and Mohaghar [18]). These transition criteria should reflect the existence of an inertial range in the turbulence spectrum, which must translate into a noticeable separation between the energetic and dissipative scales.…”
Section: E Turbulent Transition Criteria Of the Mixing Zonementioning
confidence: 99%
“…The first historically deployed strategy relies on an initial, solid or soft physical separation between the two gaseous species [2,7,[10][11][12][13][14][15]. A more recent experimental strategy aims at getting rid of any physical separation between the two gases by generating diffuse shear layers or curtains [8,[16][17][18][19].…”
Section: Introductionmentioning
confidence: 99%
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