Journal
EUROPHYSICS LETTERS
Volume 65, Issue 2, Pages 193-199Publisher
EDP SCIENCES S A
DOI: 10.1209/epl/i2003-10072-8
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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-dynamics 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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