Improved study of natural convection simulation based on energy conservation dissipative particle dynamics

Energy conservation dissipative particle dynamics (eDPD) is a mesoscale numerical simulation method used to study the heat transport process. In previous studies, when Boussinesq assumption was introduced into eDPD system natural convection, generally considered be incompressible, and effect of thermal expansion itself on results often neglected, which would cause errors in simulation. present study, characteristic first investigated, coefficient β obtained by simulation; Then based itself, convection simulated with different Rayleigh numbers Ra geometries, i.e. square cavity, concentric rings, eccentric reasonable temperature velocity fields were obtained, it agreement finite volume (FVM). The error between simulation, driven FVM significantly smaller than observed studies where directly adopted simulate natural25 phenomena while neglecting system. It shown that system's own needs introducing system, further, calculation number modified this paper.