Volume 85, Number 5, March 2009
|Number of page(s)||6|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||18 March 2009|
Heterogeneous dynamics of a granular pack under vertical tapping
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
Corresponding author: email@example.com
Accepted: 11 February 2009
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
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