Regensburg 2013 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 21: Granular Matter / Contact Dynamics

DY 21.5: Vortrag

Mittwoch, 13. März 2013, 16:00–16:15, H47

Collective Granular Dynamics in a Shaken Container at Low Gravity Conditions — •Jonathan Kollmer, Achim Sack, Michael Heckel, Fabian Zimber, and Thorsten Pöschel — MSS, FAU Erlangen-Nürnberg, Erlangen, Germany

A rectangular container partially filled with steel beads is subjected to sinusoidal motion at a set of frequencies, and amplitudes that are comparable to the length of the container. We observe the dynamics inside during the low gravitational acceleration achieved on a parabolic flight. An optical flow method is used to study the compaction dynamics and particle wall collisions are characterized using a microphone. We see different regimes of excitation from a very loose state to a more ordered "collect & collide" behavior. We compare the experimental data to force-based molecular dynamics simulations and investigate the limits of describing the system using an effective one-particle model. Understanding the dynamics of this kind of system allows for better modeling and optimization of, for example, granular dampers.