Velocity Correlations in Driven Two-Dimensional Granular Media

Details Velocity Correlations in Driven Two-Dimensional Granular Media Velocity Correlations in Driven Two-Dimensional Granular Media

1999-04-09

arxiv.org/abs/cond-mat/9904135v1

Physics

Condensed Matter

Statistical Mechanics

12 pages, 6 figures, 21 references

Scientific paper

Simulations of volumetrically forced granular media in two dimensions produce s tates with nearly homogeneous density. In these states, long-range velocity correlations with a characteristic vortex structure develop; given sufficient time, the correlations fill the entire simulated area. These velocity correlations reduce the rate and violence of collisions, so that pressure is smaller for driven inelastic particles than for undriven elastic particles in the same thermodynamic state. As the simulation box size increases, the effects of veloc ity correlations on the pressure are enhanced rather than reduced.

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