摘要： This paper presents an experimental validation of discrete element method (DEM) simulation for falling process of dry granular steps. Three chute slopes were considered in the study. The corresponding physical experiments were carried out in our previous study. The DEM simulations matched well with the experimental results regarding the external flow characteristics such as flow regimes, surface profiles, final deposit angles, velocity profiles at the sidewall, receding upper granular surfaces and flow rates. Subsequently, the DEM simulations were used to explore the internal flow patterns of the granular collapse, including translational velocity profiles and angular velocity profiles inside the granular assembly. According to the DEM simulation results, a mixed velocity profile (an upper convex and lower concave profile) appears in the central part of the chute, whilst the velocity profile follows a sidewall-stabilized heap (SSH) rheology (a concave profile) near the sidewall. The chute inclination facilitates the transformation from the SSH rheology to the mixed velocity profile in a narrow channel. The DEM simulations not only verify the experimental observation but also enhance the understanding of flow patterns induced by the collapse of dry granular steps. The following figure compares the flow characteristics between at the sidewall and at the centerline for the chute slope with θ=10°. These profiles in both locations are quite different in the earlier flow stage, but both exhibit a similar pattern in the later surface flow stage. [Display omitted] ► This paper presents a DEM simulation for falling process of dry granular steps. ► The DEM simulation matched well with the experiment for the flow behaviour. ► A mixed profile is characterized by an upper convex and lower concave profile. ► The central part of the chute exhibits a mixed velocity profile. 出版者： Amsterdam: Elsevier B.V 出版日期： 2012-11-01 出處： Powder technology, 2012-11, Vol.231, p.122-134 資源來源： ScienceDirect - Freedom Collection 版權： 2012 Elsevier B.V. 版權： 2015 INIST-CNRS 識別號： ISSN: 0032-5910 識別號： EISSN: 1873-328X 識別號： DOI: 10.1016/j.powtec.2012.08.001 識別號： CODEN: POTEBX
