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首页> 外文会议>Third International Conference on Discrete Element Methods: Numerical Modeling of Discontinua Sep 23-25, 2002 Santa Fe, New Mexico, USA >Initial Packing in Discrete Element Modeling
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Initial Packing in Discrete Element Modeling

机译：离散元素建模中的初始包装

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In most discrete element modeling, the preliminary effort focuses to create an object to be simulated, which consists of many particles. Unlike the finite element mesh, the initial configuration of particles to form an object cannot be generally determined only from the geometrical information. Except in some special cases such as a particle packing with very loose packing density and a packing arranged in regular lattice, an initial stable particle packing is achieved by (1) generation of particles with specific shape and size, and by (2) arrangement of the particles. Usually, the first procedure is performed from the computational geometry information to generate a pre-initial packing of particles. For the latter procedure, except some cases, there is still no analytical method or golden rule to determine the position and direction of each individual particle in a packing, especially for dense packing of particles with wide range of size and shape. Hence, it generally requires using mechanical ways, and consequently DEM itself is generally used. Depending on the pre-initial packing condition, this initial packing simulation sometimes consumes longer time than the total time of the simulation of main interest. On the other hand, the macroscopic material properties, such as stiffness and yield strength, in discrete element modeling are characterized not only by microscopic parameters but also by the configuration of the particle arrangement after initial packing. It is due to the space distribution of inter-particle contacts or bonds which form a force passing network. In other words, we cannot fully predict the bulk properties of many particles system from the information of single particle or of two or three particles before packing.
机译：在大多数离散元素建模中，初步工作着重于创建要模拟的对象，该对象由许多粒子组成。与有限元网格不同，通常不能仅从几何信息确定形成对象的粒子的初始配置。除在某些特殊情况下（例如堆积密度非常松散的填料和规则排列的填料）外，通过（1）生成具有特定形状和尺寸的颗粒，并通过（2）布置来获得初始的稳定颗粒填料。颗粒。通常，从计算几何信息执行第一过程以生成粒子的初始填充。对于后一种过程，除某些情况外，仍然没有分析方法或黄金法则来确定填料中每个单个颗粒的位置和方向，特别是对于具有大范围尺寸和形状的颗粒的致密填料。因此，通常需要使用机械方式，因此通常使用DEM本身。根据初始包装条件，此初始包装仿真有时会比主要关注的仿真总时间花费更长的时间。另一方面，离散元素建模中的宏观材料特性（例如刚度和屈服强度）不仅由微观参数表征，而且还由初始填充后的颗粒排列构型表征。这是由于形成力传递网络的粒子间接触或键的空间分布。换句话说，我们不能从堆积之前的单个粒子或两个或三个粒子的信息中完全预测许多粒子系统的体积性质。

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