Issue
EPL
Volume 85, Number 5, March 2009
Article Number 58004
Number of page(s) 6
Section Interdisciplinary Physics and Related Areas of Science and Technology
DOI http://dx.doi.org/10.1209/0295-5075/85/58004
Published online 18 March 2009
EPL, 85 (2009) 58004
DOI: 10.1209/0295-5075/85/58004

Heterogeneous dynamics of a granular pack under vertical tapping

S. Kiesgen de Richter, G. Le Caër and R. Delannay

Institut de Physique de Rennes - UMR UR1-CNRS 6251, Université de Rennes 1, Bât. 11A, Campus de Beaulieu 263 av. Général Leclerc, 35042, Rennes Cedex, France, EU

sebastien.kiesgen@univ-rennes1.fr

received 1 December 2008; accepted in final form 11 February 2009; published March 2009
published online 18 March 2009

Abstract
The dynamics of a tri-dimensional dense granular packing under gravity and vertical tapping is numerically investigated in a stationary state. A slowing-down of the dynamics is observed close to the bottom of the packing with a correlation length of 5–6d. In this perturbed zone, the self-intermediate scattering function, decaying slower than exponentially, suggests the existence of a heterogeneous dynamics. A characteristic time scale of the dynamics depending on the distance from the bottom of the packing is extracted. Our numerical results open the way to a systematic study of the influence of external driving force and of boundary conditions on the heterogeneity of the dynamics of granular packings under gravity.

PACS
83.80.Fg - Granular solids.
05.40.-a - Fluctuation phenomena, random processes, noise, and Brownian motion.
45.70.Cc - Static sandpiles; granular compaction.

© EPLA 2009