Year: 2018
Communications in Computational Physics, Vol. 23 (2018), Iss. 1 : pp. 93–117
Abstract
We study correlations of hydrodynamic fluctuations in shear flow analytically and also by dissipative particle dynamics (DPD) simulations. The hydrodynamic equations are linearized around the macroscopic velocity field and then solved by a perturbation method in Fourier-transformed space. The autocorrelation functions (ACFs) from the analytical method are compared with results obtained from DPD simulations under the same shear-flow conditions. Up to a moderate shear rate, various ACFs from the two approaches agree with each other well. At large shear rates, discrepancies between the two methods are observed, hence revealing strong additional coupling between different fluctuating variables, which is not considered in the analytical approach. In addition, the results at low and moderate shear rates can serve as benchmarks for developing multiscale algorithms for coupling of heterogeneous solvers, such as a hybrid simulation of molecular dynamics and fluctuating hydrodynamics solver, where thermal fluctuations are indispensable.
You do not have full access to this article.
Already a Subscriber? Sign in as an individual or via your institution
Journal Article Details
Publisher Name: Global Science Press
Language: English
DOI: https://doi.org/10.4208/cicp.OA-2017-0051
Communications in Computational Physics, Vol. 23 (2018), Iss. 1 : pp. 93–117
Published online: 2018-01
AMS Subject Headings: Global Science Press
Copyright: COPYRIGHT: © Global Science Press
Pages: 25
Keywords: Hydrodynamic fluctuations correlation functions dissipative particle dynamics shear flow.
-
Theory and simulation of electrokinetic fluctuations in electrolyte solutions at the mesoscale
Deng, Mingge | Tushar, Faisal | Bravo, Luis | Ghoshal, Anindya | Karniadakis, George | Li, ZhenJournal of Fluid Mechanics, Vol. 942 (2022), Iss.
https://doi.org/10.1017/jfm.2022.377 [Citations: 3] -
Arbitrary slip length for fluid-solid interface of arbitrary geometry in smoothed particle dynamics
Cai, Xinwei | Li, Zhen | Bian, XinJournal of Computational Physics, Vol. 494 (2023), Iss. P.112509
https://doi.org/10.1016/j.jcp.2023.112509 [Citations: 3] -
Handbook of Materials Modeling
Domain Decomposition Methods for Multiscale Modeling
Bian, Xin | Praprotnik, Matej2018
https://doi.org/10.1007/978-3-319-50257-1_65-1 [Citations: 0] -
Handbook of Materials Modeling
Domain Decomposition Methods for Multiscale Modeling
Bian, Xin | Praprotnik, Matej2020
https://doi.org/10.1007/978-3-319-44680-6_65 [Citations: 2]