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首页> 外文期刊>Journal of Computational Physics >SIMULATION OF THE QUASI-STATIC MECHANICS AND SCALAR TRANSPORT PROPERTIES OF IDEAL GRANULAR ASSEMBLAGES
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SIMULATION OF THE QUASI-STATIC MECHANICS AND SCALAR TRANSPORT PROPERTIES OF IDEAL GRANULAR ASSEMBLAGES

机译：理想颗粒组合的准静态力学和标量传输性质的模拟

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The current article reports on the further development of a new technique for the computer simulation of the quasi-static mechanics and scalar transport properties of sphere assemblages. In an extension of a previous 2D simulation to 3D, we have developed an improved computation based on several innovations: a shuffling algorithm to rapidly generate random loose-packed configurations of particles; a microcell-adjacency method to accelerate particle-contact search; a relaxation method to overcome singularities in the static transport equations; and a simulated mechanical compression to generate dense random initial states. The improved algorithm allows for 3D simulations on a workstation platform. As major results, the dilatancy (volume expansion) computed for random dense-packed assemblages is found to depend on interparticle friction, contrary to the classical Reynolds hypothesis. Also, the use of linear-elastic contacts is found to be valid near the rigid-particle limit of interest here. Experimental data from (''triaxial'' compression) tests agree well with the simulations of both the shear strength and the electrical conductivity of sphere assemblages, when proper account is taken of the actual electrical contact resistance between steel balls as a function of load. One major conclusion is that scalar transport can serve as a useful macroscopic probe of particle-contact topology in granular media. (C) 1995 Academic Press, Inc. [References: 57]
机译：本文报道了一种新技术的进一步发展，该新技术用于对球体组件的准静态力学和标量传输特性进行计算机仿真。在将以前的2D模拟扩展到3D的过程中，我们基于以下几项创新开发了一种改进的计算方法：一种可以快速生成随机随机堆积的粒子配置的混洗算法；一种微细胞邻接法，以加速粒子接触搜索；一种克服静态输运方程奇点的松弛方法；以及模拟的机械压缩以生成密集的随机初始状态。改进的算法允许在工作站平台上进行3D仿真。作为主要结果，发现与随机密集堆积组合计算的膨胀率（体积膨胀）取决于粒子间的摩擦，这与经典的雷诺兹假设相反。同样，在这里，线性弹性接触的使用在所关注的刚性颗粒极限附近是有效的。当适当考虑钢球之间的实际电接触电阻与载荷的关系时，（“三轴”压缩）试验的实验数据与球体组件的剪切强度和电导率的模拟非常吻合。一个主要结论是，标量传输可以用作颗粒介质中粒子接触拓扑的有用的宏观探针。 （C）1995 Academic Press，Inc. [参考：57]

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