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Belousov, R; Cohen, EGD; Rondoni, L; Belousov, R (reprint author), Rockefeller Univ, New York, NY 10065 USA.
Nonequilibrium Langevin dynamics: A demonstration study of shear flow fluctuations in a simple fluid
Source PublicationPHYSICAL REVIEW E
Language英语
AbstractThe 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.
2017
Volume96Issue:2Pages:22125
Subject AreaPhysics
DOIhttp://dx.doi.org/10.1103/PhysRevE.96.022125
Citation statistics
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/21990
Collection理论物理所科研产出_SCI论文
Corresponding AuthorBelousov, R (reprint author), Rockefeller Univ, New York, NY 10065 USA.
Recommended Citation
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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