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中文摘要：
离散颗粒模型是计算稠密颗粒两相流的一种重要模型，该模型通常采用硬球模式描述颗粒问的作用。提出一种在二维非结构化网格下结合硬球模式求解颗粒群运动的数值方法，对颗粒间的碰撞检测策略进行了优化，通过对颗粒采用局部移动的方法大大提高了计算的效率。数值算例显示在颗粒粒径小于网格尺度时，该方法能适应多种类型的网格，这为进一步实现不规则区域下稠密颗粒两相流的数值模拟奠定了基础。
英文摘要：
The discrete particle model is a very important approach to simulate dense particulate flows and the hard sphere model is often cooperated to describe the particle-particle interactions. A numerical method based on the hard sphere model is presented to simulate granular flows applying unstructured meshes. To speed up the computation, an efficient algorithm for collision searching and adopted. Numerical experiments show that the method a local movement strategy for particle position updating are can be used to simulate 2D granular flows without regard to the cell shape of the mesh given the particle diameter smaller than the cell face. The numerical method presented here gives a good start for future work to simulate dense two-phase flows in complex region applying unstructured meshes.
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