Cooling of a lattice granular fluid as an ordering process

A. Baldassarri, U. Marini Bettolo Marconi, and A. Puglisi
Phys. Rev. E 65, 051301 – Published 2 May 2002
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Abstract

We present a microscopic model of granular medium to study the role of dynamical correlations and the onset of spatial order induced by the inelasticity of the interactions on the velocity field. In spite of its simplicity and intrinsic limitations, it features several aspects of the rich phenomenology observed in granular materials and allows to make contact with other topics of statistical mechanics such as diffusion processes, domain growth, aging phenomena. Interestingly, while local observables, being controlled by the largest wavelength fluctuations, seem to suggest a purely diffusive behavior, the formation of spatially extended structures and topological defects, such as vortices and shocks, reveals a more complex scenario. Finally, only for quasielastic systems, we observe a neat scale separation, which represents a fundamental hypothesis to develop a granular hydrodynamics.

  • Received 16 May 2001

DOI:https://doi.org/10.1103/PhysRevE.65.051301

©2002 American Physical Society

Authors & Affiliations

A. Baldassarri1,2, U. Marini Bettolo Marconi1, and A. Puglisi2

  • 1INFM Udr Camerino, Dipartimento di Matematica e Fisica, Universita di Camerino, Via Madonna delle Carceri I-62032 Camerino, Italy
  • 2Universitá “La Sapienza,” Piazzale Aldo Moro 2, 00185 Roma, Italy

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Vol. 65, Iss. 5 — May 2002

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