Dynamics of vibrated granular monolayers
Theoretical Division and Center for Nonlinear Studies
Los Alamos National Laboratory - Los Alamos, NM 87545, USA
2 IBM Research Division, T. J. Watson Research Center P.O. Box 218, Yorktown Heights, NY 10598, USA
Accepted: 5 April 2000
We study statistical properties of vibrated granular monolayers using molecular dynamics simulations. We show that at high excitation strengths, the system is in a gas state, particle motion is isotropic, and the velocity distributions are Gaussian. As the vibration strength is lowered, the system's dimensionality is effectively reduced from three to two. Below a critical excitation strength, a cluster phase occurs, and the velocity distribution becomes bimodal. In this phase, the system consists of clusters of immobile particles arranged in close-packed hexagonal arrays, and gas particles whose energy equals the first excited state of an isolated particle on a vibrated plate.
PACS: 81.05.Rm – Porous materials; granular materials / 05.70.Fh – Phase transitions: general studies / 02.70.Ns – Molecular dynamics and particle methods
© EDP Sciences, 2000