Bifurcations of a driven granular system under gravity

Details Bifurcations of a driven granular system under gravity Bifurcations of a driven granular system under gravity

2001-06-25

arxiv.org/abs/cond-mat/0106500v1

Phys. Rev. E 64, 031304 (2001)

Physics

Condensed Matter

Statistical Mechanics

35 pages, 17 figures, to be published in PRE

Scientific paper

10.1103/PhysRevE.64.031304

Molecular dynamics study on the granular bifurcation in a simple model is presented. The model consists of hard disks, which undergo inelastic collisions; the system is under the uniform external gravity and is driven by the heat bath. The competition between the two effects, namely, the gravitational force and the heat bath, is carefully studied. We found that the system shows three phases, namely, the condensed phase, locally fluidized phase, and granular turbulent phase, upon increasing the external control parameter. We conclude that the transition from the condensed phase to the locally fluidized phase is distinguished by the existence of fluidized holes, and the transition from the locally fluidized phase to the granular turbulent phase is understood by the destabilization transition of the fluidized holes due to mutual interference.

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