title: Hydrodynamic theory for granular gases
abstract: A granular gas subjected to a permanent injection of energy is described by means of hydrodynamic equations derived from a moment expansion method. The method uses as reference function not a Maxwellian distribution f(M) but a distribution f(0)=Phif(M), such that Phi adds a fourth cumulant kappa to the velocity distribution. The formalism is applied to a stationary conductive case showing that the theory fits extraordinarily well the results coming from our Newtonian molecular dynamic simulations once we determine kappa as a function of the inelasticity of the particle-particle collisions. The shape of kappa is independent of the size N of the system.
authors.affiliation: Departamento de Fisica, Universidad de Chile, Santiago, Chile and CECAM, ENS-Lyon, 46 Allee d'Italie, 69007 Lyon, France.
authors.initials: R
authors.lastname: Ramirez
authors.initials: D
authors.lastname: Risso
authors.initials: R
authors.lastname: Soto
authors.initials: P
authors.lastname: Cordero