Issue
EPL
Volume 79, Number 3, August 2007
Article Number 36002
Number of page(s) 6
Section Condensed Matter: Structural, Mechanical and Thermal Properties
DOI http://dx.doi.org/10.1209/0295-5075/79/36002
Published online 18 July 2007
EPL, 79 (2007) 36002
DOI: 10.1209/0295-5075/79/36002

Transport coefficients of dissipative particle dynamics with finite time step

H. Noguchi and G. Gompper

Institut für Festkörperforschung, Forschungszentrum Jülich - 52425 Jülich, Germany

hi.noguchi@fz-juelich.de

received 22 May 2007; accepted in final form 19 June 2007; published August 2007
published online 18 July 2007

Abstract
The viscosity and self-diffusion constant of a mesoscale hydrodynamic method, dissipative particle dynamics (DPD), are investigated. The viscosity of DPD with finite time step, including the Lowe-Anderson thermostat, is derived analytically for the ideal-gas equation of state and phenomenologically for systems with soft repulsive potentials. The results agree well with numerical data. A velocity-scaling version of the profile-unbiased thermostat is shown to be useful to obtain faster diffusion than for the DPD thermostat.

PACS
66.20.+d - Viscosity of liquids; diffusive momentum transport.
02.70.-c - Computational techniques; simulations.
47.11.-j - Computational methods in fluid dynamics.

© Europhysics Letters Association 2007