Oscillatory instability in a driven granular gas

Details Oscillatory instability in a driven granular gas Oscillatory instability in a driven granular gas

2003-11-13

arxiv.org/abs/cond-mat/0311303v1

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 4 figures, to appear in Europhysics Letters

Scientific paper

10.1209/epl/i2003-10072-8

We discovered an oscillatory instability in a system of inelastically colliding hard spheres, driven by two opposite "thermal" walls at zero gravity. The instability, predicted by a linear stability analysis of the equations of granular hydrodynamics, occurs when the inelasticity of particle collisions exceeds a critical value. Molecular dynamic simulations support the theory and show a stripe-shaped cluster moving back and forth in the middle of the box away from the driving walls. The oscillations are irregular but have a single dominating frequency that is close to the frequency at the instability onset, predicted from hydrodynamics.

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