No abstract

Hard Disks system is a paradicmatic model well suited, numericaly, to test new approaches to nonequilibrium fenomena, being also easy and fast to simulate due to efficient event driven algorithms present in the literature. In this poster we study several properties of the model under a temperature gradient on the stationary regime. In this situation the sistem has well defined gradients in temperatures and densities allowing us to calculate experimentaly the thermal conductivity. We found this result compatible with the Enskog expresion even for large gradients. We also check that Henderson's state equation, although is an expresion derived under equilibrium conditions, is valid in our system for a wide range of temperatures gradients. We explain this fact showing that the system reach a local thermal equilibrium. Finaly we focus on the role of fluctuations of the energy current finding good agreement with the, recently introduced, Isometric Fluctuation Relation (IFR). We conclude that IFR also stands in our system, although it was formulated from a much simpler case.