Mixing transition in a shocked variabledensity flow
Abstract
We measure twodimensional velocity and density fluctuations in a shockdriven heavy gas curtain for three different incident Mach numbers (M = 1.21, 1.36, and 1.50) and a fixed initial perturbation. We study the time evolution of the velocity and density fields and observe two different mixing transitions in this unsteady flow. The first transition is caused by smallscale mixing in vortex cores, while the second transition is related to increased homogenization across the mixing layer and a drive towards isotropy. By measuring the anisotropy of the velocity fluctuations and the evolution of the turbulent kinetic energy, we are able to assess the anisotropy of the flow. For the first time in RichtmyerMeshkov (RM) flows, we measure and compare turbulent length scales derived from both the density and velocity field measurements, and we find ratios of LiepmannTaylor to innerviscous scales (λ_{L}/λ_{v}) that are inconsistent with those found using Reynolds number scaling based on circulation, Re_{Γ}, or based on turbulent kinetic energy, Re_{K}. At late times, Re_{K} better reflects the decay of the mixing field than Reynolds numbers that are based upon mixing width or circulation. We also estimate the time evolution of dissipation and Kolmogorov scales for the first time inmore »
 Authors:

 Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
 Indian Inst. of Technology (IIT), Mumbai (India)
 Univ. of New Mexico, Albuquerque, NM (United States)
 Publication Date:
 Research Org.:
 Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
 Sponsoring Org.:
 USDOE
 OSTI Identifier:
 1492592
 Report Number(s):
 LAUR1522836
Journal ID: ISSN 10706631; PHFLE6
 Grant/Contract Number:
 89233218CNA000001
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Physics of Fluids
 Additional Journal Information:
 Journal Volume: 27; Journal Issue: 11; Journal ID: ISSN 10706631
 Publisher:
 American Institute of Physics (AIP)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 42 ENGINEERING; RichtmyerMeshkov; mixing; turbulence
Citation Formats
Orlicz, G. C., Balasubramanian, Sridhar, Vorobieff, P., and Prestridge, K. P. Mixing transition in a shocked variabledensity flow. United States: N. p., 2015.
Web. doi:10.1063/1.4935183.
Orlicz, G. C., Balasubramanian, Sridhar, Vorobieff, P., & Prestridge, K. P. Mixing transition in a shocked variabledensity flow. United States. doi:10.1063/1.4935183.
Orlicz, G. C., Balasubramanian, Sridhar, Vorobieff, P., and Prestridge, K. P. Mon .
"Mixing transition in a shocked variabledensity flow". United States. doi:10.1063/1.4935183. https://www.osti.gov/servlets/purl/1492592.
@article{osti_1492592,
title = {Mixing transition in a shocked variabledensity flow},
author = {Orlicz, G. C. and Balasubramanian, Sridhar and Vorobieff, P. and Prestridge, K. P.},
abstractNote = {We measure twodimensional velocity and density fluctuations in a shockdriven heavy gas curtain for three different incident Mach numbers (M = 1.21, 1.36, and 1.50) and a fixed initial perturbation. We study the time evolution of the velocity and density fields and observe two different mixing transitions in this unsteady flow. The first transition is caused by smallscale mixing in vortex cores, while the second transition is related to increased homogenization across the mixing layer and a drive towards isotropy. By measuring the anisotropy of the velocity fluctuations and the evolution of the turbulent kinetic energy, we are able to assess the anisotropy of the flow. For the first time in RichtmyerMeshkov (RM) flows, we measure and compare turbulent length scales derived from both the density and velocity field measurements, and we find ratios of LiepmannTaylor to innerviscous scales (λL/λv) that are inconsistent with those found using Reynolds number scaling based on circulation, ReΓ, or based on turbulent kinetic energy, ReK. At late times, ReK better reflects the decay of the mixing field than Reynolds numbers that are based upon mixing width or circulation. We also estimate the time evolution of dissipation and Kolmogorov scales for the first time in RM flows. When we estimate the Taylor microscale (λT) for our experiments using both density and velocity, the density microscale agrees well with with the relationship λT = √10δRe1/2 where Re = ReK and δ is the mixing layer width, but the velocitybased Taylor microscale follows a new scaling of λT = 10δRe1/2.},
doi = {10.1063/1.4935183},
journal = {Physics of Fluids},
number = 11,
volume = 27,
place = {United States},
year = {2015},
month = {11}
}
Web of Science
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