Regensburg 2016 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 3: Granular Matter
DY 3.6: Vortrag
Montag, 7. März 2016, 11:15–11:30, H46
Declustering in a granular gas as a finite size effect — •Mathias Hummel and Marco Giacomo Mazza — Max Planck Institute for Dynamics and Self-Organization
For realistic models of granular collisions, where the coefficient of restitution depends on the impact velocity, the existence of dense clusters has been shown to be a transient phenomenon. We report direct numerical simulations that elucidate the conditions for the disappearance of structures. We find that upon cluster formation the granular temperature and the convective kinetic energy couple and both follow Haff’s law. Furthermore, we show that clusters will eventually dissolve in all finite size systems. We find the strong power law t′∝ L12 for the declustering time. Our results imply that only in systems close to the initial critical system size both the clustering and declustering transitions are observable.