Vincent Carpenter **

Vincent Carpenter  **  (Germany)

carpenter  @

Simulations of the Onset of Collective Motion of Sedimenting Particles

Niclas Schneider and Gerhard Wurm have conducted experiments at the University of Duisburg-Essen in which they drop hollow glass beads through a rotating chamber filled with air, and have observed a transition in the sedimentation behavior of the particles.  For average dust to gas ratios above 0.08 (across the entire chamber), individual particles that are located in closely packed groups sediment faster than isolated particles, with an amount of addition speed that depends on how closely packed the groups are. We attempt to replicate these experiments with numerical hydrodynamics simulations using the Pencil Code, both to validate the code and to allow for detailed exploration of the mechanisms involved in triggering the collective motion.

Supervisor:  Hubert Klahr  (MPIA)

**)  to be accepted