Close-packed granular clusters: Hydrostatics and persistent Gaussian fluctuations
Meerson B, Díez-Minguito M, Schwager T, Pöschel T (2007)
Publication Language: English
Publication Status: Published
Publication Type: Journal article, Original article
Publication year: 2007
Journal
Publisher: Springer Verlag (Germany)
Book Volume: 10
Pages Range: 21-27
Journal Issue: 1
DOI: 10.1007/s10035-007-0055-1
Abstract
Dense granular clusters often behave like macro-particles. We address this interesting phenomenon in a model system of inelastically colliding hard disks inside a circular box, driven by a thermal wall at zero gravity. Molecular dynamics simulations show a close-packed cluster of almost circular shape, weakly fluctuating in space and isolated from the driving wall by a low-density gas. The density profile of the system agrees very well with the azimuthally symmetric solution of granular hydrostatic equations employing constitutive relations by Grossman et al., whereas the widely used Enskog-type constitutive relations show poor accuracy. We find that fluctuations of the center of mass of the system are Gaussian. This suggests an effective Langevin description in terms of a macro-particle, confined by a harmonic potential and driven by delta-correlated noise. Surprisingly, the fluctuations persist when increasing the number of particles in the system. © 2007 Springer-Verlag.
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Israel (IL)
Spain (ES)How to cite
APA:
Meerson, B., Díez-Minguito, M., Schwager, T., & Pöschel, T. (2007). Close-packed granular clusters: Hydrostatics and persistent Gaussian fluctuations. Granular Matter, 10(1), 21-27. https://doi.org/10.1007/s10035-007-0055-1
MLA:
Meerson, Baruch, et al. "Close-packed granular clusters: Hydrostatics and persistent Gaussian fluctuations." Granular Matter 10.1 (2007): 21-27.
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