ITP OpenIR  > 理论物理所2017年知识产出
Nonequilibrium Langevin dynamics: A demonstration study of shear flow fluctuations in a simple fluid
Belousov, R; Cohen, EGD; Rondoni, L; Belousov, R (reprint author), Rockefeller Univ, New York, NY 10065 USA.
2017
发表期刊PHYSICAL REVIEW E
卷号96期号:2页码:22125
文章类型Article
摘要The present paper is based on a recent success of the second-order stochastic fluctuation theory in describing time autocorrelations of equilibrium and nonequilibrium physical systems. In particular, it was shown to yield values of the related deterministic parameters of the Langevin equation for a Couette flow in a microscopic molecular dynamics model of a simple fluid. In this paper we find all the remaining constants of the stochastic dynamics, which then is simulated numerically and compared directly with the original physical system. By using these data, we study in detail the accuracy and precision of a second-order Langevin model for nonequilibrium physical systems theoretically and computationally. We find an intriguing relation between an applied external force and cumulants of the resulting flow fluctuations. This is characterized by a linear dependence of an athermal cumulant ratio, an apposite quantity introduced here. In addition, we discuss how the order of a given Langevin dynamics can be raised systematically by introducing colored noise.
学科领域Physics
DOIhttp://dx.doi.org/10.1103/PhysRevE.96.022125
关键词[WOS]REVERSIBLE INTEGRATORS ; SYSTEMS
语种英语
WOS类目Physics, Fluids & Plasmas ; Physics, Mathematical
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文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/21990
专题理论物理所2017年知识产出
通讯作者Belousov, R (reprint author), Rockefeller Univ, New York, NY 10065 USA.
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GB/T 7714
Belousov, R,Cohen, EGD,Rondoni, L,et al. Nonequilibrium Langevin dynamics: A demonstration study of shear flow fluctuations in a simple fluid[J]. PHYSICAL REVIEW E,2017,96(2):22125.
APA Belousov, R,Cohen, EGD,Rondoni, L,&Belousov, R .(2017).Nonequilibrium Langevin dynamics: A demonstration study of shear flow fluctuations in a simple fluid.PHYSICAL REVIEW E,96(2),22125.
MLA Belousov, R,et al."Nonequilibrium Langevin dynamics: A demonstration study of shear flow fluctuations in a simple fluid".PHYSICAL REVIEW E 96.2(2017):22125.
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