Molecular hydrodynamics: Vortex formation and sound wave propagation
Abstract
In the present study, quantitative feasibility tests of the hydrodynamic description of a twodimensional fluid at the molecular level are performed, both with respect to length and time scales. Using highresolution fluid velocity data obtained from extensive molecular dynamics simulations, we computed the transverse and longitudinal components of the velocity field by the Helmholtz decomposition and compared them with those obtained from the linearized NavierStokes (LNS) equations with timedependent transport coefficients. By investigating the vortex dynamics and the sound wave propagation in terms of these field components, we confirm the validity of the LNS description for times comparable to or larger than several mean collision times. The LNS description still reproduces the transverse velocity field accurately at smaller times, but it fails to predict characteristic patterns of molecular origin visible in the longitudinal velocity field. Based on these observations, we validate the main assumptions of the modecoupling approach. The assumption that the velocity autocorrelation function can be expressed in terms of the fluid velocity field and the tagged particle distribution is found to be remarkably accurate even for times comparable to or smaller than the mean collision time. This suggests that the hydrodynamicmode description remains valid down to the molecularmore »
 Authors:

 Korea Advanced Inst. Science and Technology (KAIST), Daejeon (Korea, Republic of)
 Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
 Univ. Augsburg (Germany)
 Brown Univ., Providence, RI (United States)
 Publication Date:
 Research Org.:
 Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
 Sponsoring Org.:
 USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR) (SC21)
 OSTI Identifier:
 1435106
 Alternate Identifier(s):
 OSTI ID: 1416644
 Grant/Contract Number:
 AC0205CH11231; AC0500OR22725
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Journal of Chemical Physics
 Additional Journal Information:
 Journal Volume: 148; Journal Issue: 2; Related Information: © 2018 Author(s).; Journal ID: ISSN 00219606
 Publisher:
 American Institute of Physics (AIP)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
Citation Formats
Han, Kyeong Hwan, Kim, Changho, Talkner, Peter, Karniadakis, George Em, and Lee, Eok Kyun. Molecular hydrodynamics: Vortex formation and sound wave propagation. United States: N. p., 2018.
Web. doi:10.1063/1.5011992.
Han, Kyeong Hwan, Kim, Changho, Talkner, Peter, Karniadakis, George Em, & Lee, Eok Kyun. Molecular hydrodynamics: Vortex formation and sound wave propagation. United States. doi:10.1063/1.5011992.
Han, Kyeong Hwan, Kim, Changho, Talkner, Peter, Karniadakis, George Em, and Lee, Eok Kyun. Sun .
"Molecular hydrodynamics: Vortex formation and sound wave propagation". United States. doi:10.1063/1.5011992. https://www.osti.gov/servlets/purl/1435106.
@article{osti_1435106,
title = {Molecular hydrodynamics: Vortex formation and sound wave propagation},
author = {Han, Kyeong Hwan and Kim, Changho and Talkner, Peter and Karniadakis, George Em and Lee, Eok Kyun},
abstractNote = {In the present study, quantitative feasibility tests of the hydrodynamic description of a twodimensional fluid at the molecular level are performed, both with respect to length and time scales. Using highresolution fluid velocity data obtained from extensive molecular dynamics simulations, we computed the transverse and longitudinal components of the velocity field by the Helmholtz decomposition and compared them with those obtained from the linearized NavierStokes (LNS) equations with timedependent transport coefficients. By investigating the vortex dynamics and the sound wave propagation in terms of these field components, we confirm the validity of the LNS description for times comparable to or larger than several mean collision times. The LNS description still reproduces the transverse velocity field accurately at smaller times, but it fails to predict characteristic patterns of molecular origin visible in the longitudinal velocity field. Based on these observations, we validate the main assumptions of the modecoupling approach. The assumption that the velocity autocorrelation function can be expressed in terms of the fluid velocity field and the tagged particle distribution is found to be remarkably accurate even for times comparable to or smaller than the mean collision time. This suggests that the hydrodynamicmode description remains valid down to the molecular scale.},
doi = {10.1063/1.5011992},
journal = {Journal of Chemical Physics},
number = 2,
volume = 148,
place = {United States},
year = {2018},
month = {1}
}
Web of Science
Figures / Tables:
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