Cohesive granular material
We have a hopper, filled with particles. Additional to the repulsive forces due to collisions we have cohesive forces. You can find more information in this publications.
Blocked Funnel
The walls of the hopper are not as steep as in the other examples. The flow ends when an arch forms spontaneously and the hopper is blocked.
Balls in container
A very tiny simulation. 36 balls are being thrown into a container. The rolling of the particles leads to a final configuration, which is virtually flat.
A Hole as a Funnel
Not quite a hopper, but a hole in the floor.