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DY: Fachverband Dynamik und Statistische Physik

DY 30: Poster II

DY 30.53: Poster

Donnerstag, 29. März 2007, 16:00–18:00, Poster D

Granular gas cooling and relaxation to the steady state in regard to the overpopulated tail of the velocity distribution — •Thorsten Poeschel¹, Nikolai Brilliantov², and Arno Formella³ — ¹Charité, Augustenburger Platz, 10439 Berlin — ²Institut für Physik, Universität Potsdam, Am Neuen Palais 10, 14469 Potsdam — ³Universidad de Vigo, Department of Computer Science, Edificio Politécnico, 32004 Ourense, Spain

We present a universal description of the velocity distribution function of granular gases, f(v), valid for both, small and intermediate velocities where v is close to the thermal velocity and also for large v where the distribution function reveals an exponentially decaying tail. By means of large-scale Monte Carlo simulations and by kinetic theory we show that the deviation from the Maxwell distribution in the high-energy tail leads to small but detectable variation of the cooling coefficient and to extraordinary large relaxation time.

Reference: T. Pöschel, N. Brilliantov, and A. Formella, Phys. Rev.E 74, 041302 (2006)