Volume 79, Number 6, September 2007
Article Number 60001
Number of page(s) 6
Section General
Published online 07 August 2007
EPL, 79 (2007) 60001
DOI: 10.1209/0295-5075/79/60001

Computer-aided kinetic theory and granular gases

S. H. Noskowicz, O. Bar-Lev, D. Serero and I. Goldhirsch

School of Mechanical Engineering, Faculty of Engineering, Tel-Aviv University - Ramat-Aviv, Tel-Aviv 69978, Israel

received 22 June 2007; accepted in final form 24 July 2007; published September 2007
published online 7 August 2007

A novel computer-aided method for solving kinetic equations has been developed and implemented in a study of the Boltzmann equation corresponding to elastic and inelastic hard spheres. Accurate results are obtained for the linear transport coefficients for all physical values of the coefficient of normal restitution, $\alpha $. These coefficients are bounded and nonsingular even in the limit of vanishing $\alpha $. Using the new method we also calculated the full homogeneous cooling state (HCS) distribution function (after replacing the standard divergent expansion by a convergent one) and confirmed the conjecture that it possesses an exponential tail. Further implications and applications of these results are outlined.

05.20.Dd - Kinetic theory.
45.70.-n - Granular systems .
47.45.Ab - Kinetic theory of gases.

© Europhysics Letters Association 2007