Transport coefficients of dissipative particle dynamics with finite time step

摘要

The viscosity and self-diffusion constant of a mesoscale hydrodynamic method,dissipative particle dynamics (DPD), are investigated. The viscosity of DPDwith finite time step, including the Lowe-Anderson thermostat, is derivedanalytically for the ideal-gas equation of state and phenomenologically forsystems with soft repulsive potentials. The results agree well with numericaldata. The scaling of the local relative velocity in molecular dynamicssimulations is shown to be useful to obtain faster diffusion than for the DPDthermostat.