Regensburg 2010 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 13: Granular Matter/ Contact Dynamics II

DY 13.3: Vortrag

Mittwoch, 24. März 2010, 10:15–10:30, H47

Driven two-dimensional granular fluids exhibit precursors to glass transition — •Iraj Gholami, Andrea Fiege, and Annette Zippelius — Institute of Theoretical Physics, University of Göttingen, Germany

We employ event-driven simulations of two-dimensional granular systems with constant coefficient of restitution to investigate its long-time behavior for different volume fractions up to 0.82. The driving is chosen such that momentum is conserved on local scales and a stationary state is reached, allowing us to calculate time dependent correlation functions and the mean square displacement. In order to avoid crystallization we use bi-disperse systems. The mean square displacement shows a pronounced plateau when increasing the volume fraction while the velocity autocorrelation function exhibits long-time tails ∝ t⁻¹.