Molecular-Level Simulations of Turbulence and Its Decay

Gallis, Michail A.; Bitter, Neal; Koehler, Timothy; Torczynski, J. R.; Plimpton, Steven J.; Papadakis, George

doi:10.1103/physrevlett.118.064501

Cited by 89 publications

(29 citation statements)

References 21 publications

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“…The verification of the DSMC method by the experiments enhanced its status and significance. Afterwards, the application of DSMC method has been extended to investigate a variety of gas flows at the molecular level, such as micro flows [24], flow instability [25][26][27][28], and even turbulence [29].…”

Section: Dsmc Methodsmentioning

confidence: 99%

Particle-based hybrid and multiscale methods for nonequilibrium gas flows

et al. 2019

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Over the past half century, a variety of computational fluid dynamics (CFD) methods and the direct simulation Monte Carlo (DSMC) method have been widely and successfully applied to the simulation of gas flows for the continuum and rarefied regime, respectively. However, they both encounter difficulties when dealing with multiscale gas flows in modern engineering problems, where the whole system is on the macroscopic scale but the nonequilibrium effects play an important role. In this paper, we review two particle-based strategies developed for the simulation of multiscale nonequilibrium gas flows, i.e., DSMC-CFD hybrid methods and multiscale particle methods. The principles, advantages, disadvantages, and applications for each method are described. The latest progress in the modelling of multiscale gas flows including the unified multiscale particle method proposed by the authors is presented.

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Section: Dsmc Methodsmentioning

confidence: 99%

Particle-based hybrid and multiscale methods for nonequilibrium gas flows

et al. 2019

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“…elastic scattering (DSMC) or Coulomb collisions (PIC). Despite their computational cost (for small K, the number of particle interactions is large while time scales become small), particle methods are attractive tools as they can model non-equilibrium and continuum flows [10,11].…”

Section: Introductionmentioning

confidence: 99%

Two-dimensional implosion simulations with a kinetic particle code

2017

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We perform two-dimensional (2D) implosion simulations using a Monte Carlo kinetic particle code. The application of a kinetic transport code is motivated, in part, by the occurrence of nonequilibrium effects in inertial confinement fusion (ICF) capsule implosions, which cannot be fully captured by hydrodynamic simulations. Kinetic methods, on the other hand, are able to describe both, continuum and rarefied flows. We perform simple 2D disk implosion simulations using one particle species and compare the results to simulations with the hydrodynamics code RAGE. The impact of the particle mean-free-path on the implosion is also explored. In a second study, we focus on the formation of fluid instabilities from induced perturbations. We find good agreement with hydrodynamic studies regarding the location of the shock and the implosion dynamics. Differences are found in the evolution of fluid instabilities, originating from the higher resolution of RAGE and statistical noise in the kinetic studies.

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“…The position coordinates, velocity components, and internal states of the simulated molecule are stored. These parameters are updated over time because the molecules are concurrently followed by representative collisions and boundary interactions in the simulated domain [8].…”

Section: Direct Simulation Of Monte Carlomentioning

confidence: 99%

“…However, it has been of great interest to researchers because it can provide fundamental knowledge on flow physics [8].…”

mentioning

confidence: 99%

Molecular-level study of compressible gaseous continua

Hong

Xiao

et al. 2018

J. Phys. Commun.

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For over 150 years, compressible gaseous continua have usually been formulated in terms of the Navier-Stokes-Fourier (NSF) equations for the macroscopic velocity, pressure and energy as functions of position and time. This study introduces molecular-level investigations of compressible gaseous continua using direct simulation in the Monte Carlo method and molecular dynamics. It is observed that the thermodynamic flux can be generated as long as molecular collisions occur, even without temperature drive and stress tensor work. This is contrary to the general opinion that temperature drive and stress tensor work are the only proximate causes driving thermodynamic flow.

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Molecular-Level Simulations of Turbulence and Its Decay

Cited by 89 publications

References 21 publications

Particle-based hybrid and multiscale methods for nonequilibrium gas flows

Particle-based hybrid and multiscale methods for nonequilibrium gas flows

Two-dimensional implosion simulations with a kinetic particle code

Molecular-level study of compressible gaseous continua

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