Regensburg 2007 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 30: Poster II
DY 30.53: Poster
Thursday, March 29, 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)