An easy-to-use boundary condition in dissipative particle dynamics system

Boundary condition in dissipative particle dynamics system is a challenging problem since the emergence of this promising numerical method. Here, we present a quite simple boundary condition which takes the distribution of solid particles, minimal distance between fluid and solid particles, and the velocity of fluid particle into consider. By generating an attempered velocity, the approaching fluid particles are forced back into fluid area softly. This boundary condition is good at preventing penetration and keeping the interfacial properties and meanwhile easy to implement. Three representative cases are studied to show its advantages in simulating solid/fluid systems.