Stable and accurate schemes for smoothed dissipative particle dynamics

Abstract

Smoothed Dissipative Particle Dynamics (SDPD) is a mesoscopic particle method which allows to select the level of resolution at which a fluid is simulated. The numerical integration of its equations of motion still suffers from the lack of numerical schemes satisfying all the desired properties: energy conservation, parallelizability and stability. The similarities between SDPD and Dissipative Particle Dynamics with Energy conservation (DPDE), which is another coarse-grained model, enable the adaptation of recent numerical schemes developed for DPDE to the SDPD setting. In this article, we introduce a Metropolis step in the integration of the fluctuation/dissipation part of SDPD to improve its stability.