Molecular dynamics of inelastic collisions of non-point particles with non-unitary restitution coefficients for particle-particle and particle-wall interactions in a gravitational field with quadratic drag force. The moment of inertia of particles is neglected, and only two-body collisions are considered.
Animation 1: 100 balls in a gravitational field without energy injection
Animation 2: 100 balls in a gravitational field with periodic energy injection on the lower edge
Animation 3: Illustration of a collective coalescence effect with 50'000 particles in a gravitational field with periodic energy injection on the lower edge
Animation 4: Illustration of the phase transition of the 2-urn model (as well as a convection roll) with 2'000 particles in a gravitational field with periodic energy injection on the lower edge
