Abstract
A wide range of gravity-driven dense granular flows are studied numerically by using the discrete element method and statistical analysis. Intermittency and avalanche phenomenon of slow granular flows are illustrated clearly. Through analyzing time-energy data of flows with different velocities, the transformation of flow behavior from quasi-static to kinetic regimes is observed. More importantly, a general statistical rule on time-energy distribution of dense granular system under gravity is suggested. Based on this rule, the gravity-driven dense granular flows can be characterized quantitatively and categorized into three sub-regimes according to their primary features.
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