Largest particles grow at the expense of small ones. Material properties are those of copper at 900°C. Particle size 12µm initially. Final particle size 40 µm. Periodic conditions are imposed (this is why particles comes in and out of the simulation box).
C L Martin, L C R Schneider, L Olmos, D Bouvard. Discrete element modeling of metallic powder sintering. Scripta Mater. 55, 425-428 (2006).