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.

通过离散数值模拟研究了受限颗粒流的性质。比较了两种具有不同边界的流：（i）重力驱动的流，其顶部具有自由表面，并且位于侵蚀平衡增加的基底上（ii）剪切驱动的流，其顶部施加恒定压力而底部颠簸移动以恒定的速度。在这两种情况下，我们都观察到蠕变区域之上或之下的剪切局部化。我们表明，尽管不同的边界会引起不同的流动特性（例如横向速度剖面的剪切局部化），