Berlin 2015 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 12: Granular Matter / Contact Dynamics Part II
DY 12.4: Talk
Monday, March 16, 2015, 16:15–16:30, BH-N 128
The Mach number determines the onset of clustering in a dissipative gas — •Mathias Hummel, James Clewett, Stephan Herminghaus, and Marco G. Mazza — Max Planck Institut für Dynamik und Selbstorganisation
We perform direct numerical simulations of granular hydrodynamics to study the clustering of a dissipative gas for constant coefficients of restitution in three dimensions. We demonstrate that clustering appears when the ratio between local bulk velocity and local thermal velocity, that is the Mach number, reaches a threshold value Mt ≈ 10−3, independently of the coefficient of restitution. We also find that the local Mach numbers, and not the coefficient of restitution, determine the evolution of the clusters.