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Applied Mathematics and Mechanics

, Volume 39, Issue 1, pp 31–46 | Cite as

Discussions on the correspondence of dissipative particle dynamics and Langevin dynamics at small scales

  • D. Azarnykh
  • S. Litvinov
  • X. Bian
  • N. A. Adams
Article

Abstract

We investigate the behavior of dissipative particle dynamics (DPD) within different scaling regimes by numerical simulations. The paper extends earlier analytical findings of Ripoll, M., Ernst, M. H., and Espa˜nol, P. (Large scale and mesoscopic hydrodynamics for dissipative particle dynamics. Journal of Chemical Physics, 115(15), 7271–7281 (2001)) by evaluation of numerical data for the particle and collective scaling regimes and the four different subregimes. DPD simulations are performed for a range of dynamic overlapping parameters. Based on analyses of the current auto-correlation functions (CACFs), we demonstrate that within the particle regime at scales smaller than its force cut-off radius, DPD follows Langevin dynamics. For the collective regime, we show that the small-scale behavior of DPD differs from Langevin dynamics. For the wavenumber-dependent effective shear viscosity, universal scaling regimes are observed in the microscopic and mesoscopic wavenumber ranges over the considered range of dynamic overlapping parameters.

Key words

dissipative particle dynamics (DPD) mesoscopic dynamics fluctuating hydrodynamics 

Chinese Library Classification

O352 

2010 Mathematics Subject Classification

82-08 82C31 76M28 

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Notes

Acknowledgements

The first author acknowledges travel support from the Technical University of Munich (TUM) Graduate School. We thank the Munich Center of Advanced Computing for providing computational resources. We thank V. BOGDANOV for proofreading.

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Copyright information

© Shanghai University and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • D. Azarnykh
    • 1
  • S. Litvinov
    • 2
  • X. Bian
    • 1
  • N. A. Adams
    • 1
  1. 1.Chair of Aerodynamics and Fluid Mechanics, Department of Mechanical EngineeringTechnical University of MunichMünchenGermany
  2. 2.Chair of Computational ScienceEidgenössische Technische Hochschule ZürichZurichSwitzerland

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