Volume 65, Number 2, January 2004
|Page(s)||193 - 199|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||01 January 2004|
Oscillatory instability in a driven granular gas
Racah Institute of Physics, Hebrew University of Jerusalem - Jerusalem 91904, Israel
Accepted: 12 November 2003
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.
PACS: 45.70.-n – Granular systems / 45.70.Qj – Pattern formation
© EDP Sciences, 2004
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