Reference : Dynamical clustering in driven granular gas
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/2268/129371
Dynamical clustering in driven granular gas
English
Opsomer, Eric mailto [Université de Liège - ULg > Département de physique > Physique statistique >]
Ludewig, François mailto [Université de Liège - ULg > Département de physique > Physique statistique >]
Vandewalle, Nicolas mailto [Université de Liège - ULg > Département de physique > Physique statistique >]
20-Aug-2012
Europhysics Letters [=EPL]
EDP Sciences
99
Yes (verified by ORBi)
International
0295-5075
1286-4854
Les Ulis
France
[en] granular gas ; microgravity ; numerical simulations
[en] Driven granular gases present rich dynamical behaviors. Due to inelastic collisions, particles may form dense and slow regions. These clusters emerge naturally during a cooling phenomenon but another dynamical clustering is observed when the system is continuously excited. In this paper, the physical processes that trigger the transition from a granular gas to a dynamical cluster are evidenced through numerical simulations. At the granular scale, the transition is evidenced by the observation of caging effects. At the scale of the system, the transition is emphasized by density fluctuations. Physical arguments, based on relaxation times, provide an analytical prediction for the edge between dynamical regimes.
http://hdl.handle.net/2268/129371

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