摘要：颗粒流问题是众多工农业生产领域中的常见问题,然而人们至今对颗粒流机理认识不深。目前一种基于离散元的数值模拟方法被用以模拟和分析颗粒流问题,研究实践表明该方法是散体力学分析的一种有效的工具。本文介绍了颗粒流研究的背景以及离散元法的发展过程,概述了颗粒流动力学研究的动理论模型和摩擦塑性模型,综述了离散元法的理论和各种颗粒作用模型及其在粉体工程领域的应用,讨论了颗粒流研究的主要困难和离散元法发展中亟待解决的问题。

关键词：颗粒流；数值模拟；离散元法

Abstract：Granular flow problems are very common in many agricultural and industrial areas,but still people don't know the mechanism of granular flow quite well.Nowadays a numerical simulation method which is based on discrete element is applied in simulating and analysing granular flow problems.The research practices indicate this method is a useful implement in granular mechanics analysis.The background of granular flow researches,and the development of the discrete element method are introduced.The kinetic theory model and the friction-plasticity model of granular flow dynamics researches are summarized.The theory of the discrete element method and various models of particle interaction,as well as the applications of the discrete element method in area of powder engineering are briefly described.Finally the main difficulties in granular flow researches and the future research topics in the discrete element method are discussed.

Keywords：granular flow;numerical simulation;discrete element method