论文标题
侧向限制对颗粒流的影响：剪切驱动和重力驱动流之间的比较
Influence of lateral confinement on granular flows: comparison between shear-driven and gravity-driven flows
论文作者
论文摘要
通过离散的数值模拟研究了狭窄的颗粒流的特性。比较了两种具有不同边界的流量：（i）重力驱动的流动，上面是自由表面，在底座上，侵蚀平衡（II）剪切驱动的流动在其顶部施加恒定压力，并且在恒定速度下以颠簸的底部施加恒定压力。在这两种情况下，我们都会观察到剪切定位在或/和蠕变区域下。我们表明，尽管不同的边界会引起不同的流量特性（例如，横向速度曲线的剪切定位），但两种类型的流量具有共同的特性，例如（i）颗粒温度和剪切速率之间的功率定律关系（它们的指数从1的稀释流量到2的稀释流量）和（ii）与FRED的较弱的流动相同的流量相比，该范围较弱。
The properties of confined granular flows are studied through discrete numerical simulations. Two types of flows with different boundaries are compared: (i) gravity-driven flows topped with a free surface and over a base where erosion balances accretion (ii) shear-driven flows with a constant pressure applied at their top and a bumpy bottom moving at constant velocity. In both cases we observe shear localization over or/and under a creep zone. We show that, although the different boundaries induce different flow properties (e.g. shear localization of transverse velocity profiles), the two types of flow share common properties like (i) a power law relation between the granular temperature and the shear rate (whose exponent varies from 1 for dense flows to 2 for dilute flows) and (ii) a weakening of friction at the sidewalls which gradually decreases with the depth within the flow.
