Abstract
We investigate using a discrete element method the kinetic properties of a system composed of a bilayer of granular spheres submitted to a vertical vibration. For moderate dimensionless acceleration, no mixing between layers is observed and the horizontal velocity distributions of the top-layer particles with are quasi-Gaussian. The robustness of this phenomenon is examined for a variety of physical parameters (acceleration of the bottom plate, mass ratio, layer coverage, etc.). A microscopic analysis of the simulation dynamics leads to a simple picture of the underlying mechanisms.
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