title: Diffusivity and weak clustering in a quasi-two-dimensional granular gas.
abstract: We present results from a detailed simulation of a quasi-two-dimensional dissipative granular gas, kept in a noncondensed steady state via vertical shaking over a rough substrate. This gas shows a weak power-law decay in the tails of its pair distribution functions, indicating clustering. This clustering depends monotonically on the dissipation coefficient and disappears when the sphere-sphere collisions are conservative. Clustering is also sensitive to the packing fraction. This gas also displays the standard nonequilibrium characteristics of similar systems, including non-Maxwellian velocity distributions. The diffusion coefficients are calculated over all the conditions of the simulations, and it is found that diluted gases are more diffusive for smaller restitution coefficients.
authors.affiliation: Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados del IPN, Unidad Mérida, AP 73 Cordemex, 97310 Mérida, Yucatán, Mexico. jperera@mda.cinvestav.mx
authors.forename: J A
authors.initials: JA
authors.lastname: Perera-Burgos
authors.forename: G
authors.initials: G
authors.lastname: Pérez-Ángel
authors.forename: Y
authors.initials: Y
authors.lastname: Nahmad-Molinari