Transport coefficients of dissipative particle dynamics with finite time stepH. Noguchi and G. Gompper
Institut für Festkörperforschung, Forschungszentrum Jülich - 52425 Jülich, Germany
received 22 May 2007; accepted in final form 19 June 2007; published August 2007
published online 18 July 2007
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.
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