Journal ArticleDOI
Incident shock Mach number effects on Richtmyer-Meshkov mixing in a heavy gas layer
TLDR
In this paper, the effect of incident shock Mach number (M) on the development of Richtmyer-Meshkov instability after a shock wave impulsively accelerates a varicose-perturbed, heavy-gas curtain was investigated.Abstract:
Experiments were performed at the horizontal shock tube facility at Los Alamos National Laboratory to study the effect of incident shock Mach number (M) on the development of Richtmyer-Meshkov instability after a shock wave impulsively accelerates a varicose-perturbed, heavy-gas curtain. Three cases of incident shock strength were experimentally investigated: M = 1.21, 1.36, and 1.50. We discuss the state of the mixing and the mechanisms that drive the mixing at both large and small scales by examining the time evolution of 2D density fields derived from quantitative planar laser-induced fluorescence measurements. Several differences in qualitative flow features are identified as a result of Mach number variation, and differences in vortex interaction, observed using particle image velocimetry, play a critical role in the development of the flow field. Several quantities, including mixing layer width, mixing layer area, interface length, instantaneous mixing rate, the density self-correlation parameter, probability density functions of the density field, and mixing progress variables are examined as a function of time. These quantities are also examined versus time scaled with the convection velocity of the mixing layer. A higher incident Mach number yields greater mixing uniformity at a given downstream location, while a lower Mach number produces a greater amount of total mixing between the two gases, suggesting possible implications for optimization in applications with confined geometries.read more
Citations
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Journal ArticleDOI
Rayleigh–Taylor and Richtmyer-Meshkov instability induced flow, turbulence, and mixing. II
TL;DR: In this article, Zhou et al. presented the initial condition dependence of Rayleigh-Taylor (RT) and Richtmyer-Meshkov (RM) mixing layers, and introduced parameters that are used to evaluate the level of mixedness and mixed mass within the layers.
Journal ArticleDOI
On the Richtmyer–Meshkov instability evolving from a deterministic multimode planar interface
V. K. Tritschler,Britton J. Olson,Sanjiva K. Lele,Stefan Hickel,Xiangyu Hu,Nikolaus A. Adams +5 more
TL;DR: In this paper, two different and independently developed numerical methods with the objective of assessing turbulence structures, prediction uncertainties and convergence behavior are compared. But the focus of the present study is to quantify the uncertainties introduced by the numerical method, as there is strong evidence that subgrid-scale regularization and truncation errors may have a significant effect on the linear and nonlinear stages of the RMI evolution.
Journal ArticleDOI
Late-time growth rate, mixing and anisotropy in the multimode narrowband Richtmyer--Meshkov Instability: the $\theta$-Group Collaboration
Ben Thornber,J. Griffond,Olivier Poujade,N. Attal,H. Varshochi,Pedram Bigdelou,Praveen Ramaprabhu,Britton J. Olson,Jeffrey Greenough,Ye Zhou,Oleg Schilling,K. A. Garside,R. J. R. Williams,C. A. Batha,P. A. Kuchugov,M. E. Ladonkina,V. F. Tishkin,N. V. Zmitrenko,Vladislav B. Rozanov,D. L. Youngs +19 more
TL;DR: In this paper, a series of high-resolution three dimensional smulations of two initial conditions with eight independent codes were used to investigate the turbulent Richtmyer-Meshkov instability.
Journal ArticleDOI
Late-time growth rate, mixing, and anisotropy in the multimode narrowband Richtmyer–Meshkov instability: The θ-group collaboration
Ben Thornber,J. Griffond,Olivier Poujade,Nitesh Attal,Hilda Varshochi,Pedram Bigdelou,Praveen Ramaprabhu,Britton J. Olson,Jeffrey Greenough,Ye Zhou,Oleg Schilling,K. A. Garside,R. J. R. Williams,C. A. Batha,P. A. Kuchugov,P. A. Kuchugov,Marina Eugenievna Ladonkina,Vladimir Fedorovich Tishkin,N. V. Zmitrenko,Vladislav B Rozanov,David L. Youngs +20 more
TL;DR: In this article, a series of high-resolution three-dimensional simulations of two initial conditions with eight independent codes is presented, where the simulations are initialised with a narrowband perturbation such that instability growth is due to nonlinear coupling/backscatter from the energetic modes, thus generating the lowest expected growth rate from a pure RMI.
Journal ArticleDOI
Direct simulation Monte Carlo investigation of the Richtmyer-Meshkov instability
TL;DR: In this paper, the authors investigated the Richtmyer-Meshkov instability (RMI) using the Direct Simulation Monte Carlo (DSMC) method of molecular gas dynamics.
References
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