Berlin 2012 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 29: Posters II

DY 29.54: Poster

Donnerstag, 29. März 2012, 17:00–19:00, Poster A

Dynamics of an Intruder in Dense Granular Fluids — •Matthias Grob, Andrea Fiege, and Annette Zippelius — Institut für Theoretische Physik, Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany

We investigate the dynamics of an intruder pulled by a constant force in a dense two-dimensional granular fluid by means of event-driven molecular dynamics simulations. We show how a propagating momentum front develops and compactifies the system when reflected by the boundaries. We then add a frictional force acting on each particle, proportional to the particle's velocity. Frictional motion in an event-driven simulation is implemented which allows us to carry out extensive numerical simulations aiming at the dependence of the intruder's velocity on packing fraction and pulling force. We identify a linear relation for small and a nonlinear regime for high pulling forces.