Issue |
Europhys. Lett.
Volume 65, Number 2, January 2004
|
|
---|---|---|
Page(s) | 193 - 199 | |
Section | Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics | |
DOI | https://doi.org/10.1209/epl/i2003-10072-8 | |
Published online | 01 January 2004 |
Oscillatory instability in a driven granular gas
Racah Institute of Physics, Hebrew University of Jerusalem - Jerusalem 91904, Israel
Received:
25
July
2003
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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