Discrete element method can effectively simulate the discontinuity,inhomogeneity and large deformation and failure of rock and soil.Based on the innovative matrix computing of the discrete element method,the highperfo...Discrete element method can effectively simulate the discontinuity,inhomogeneity and large deformation and failure of rock and soil.Based on the innovative matrix computing of the discrete element method,the highperformance discrete element software MatDEM may handle millions of elements in one computer,and enables the discrete element simulation at the engineering scale.It supports heat calculation,multi-field and fluidsolid coupling numerical simulations.Furthermore,the software integrates pre-processing,solver,postprocessing,and powerful secondary development,allowing recompiling new discrete element software.The basic principles of the DEM,the implement and development of the MatDEM software,and its applications are introduced in this paper.The software and sample source code are available online(http://matdem.com).展开更多
岩土颗粒材料的力学响应呈现多尺度特性,开展有限元法(Finite Element Method,FEM)和离散元法(Discrete Element Method,DEM)耦合的多尺度模拟可在反映多尺度响应的同时兼顾计算效率.为此,基于国产高性能离散元软件MatDEM开发了GPU并行F...岩土颗粒材料的力学响应呈现多尺度特性,开展有限元法(Finite Element Method,FEM)和离散元法(Discrete Element Method,DEM)耦合的多尺度模拟可在反映多尺度响应的同时兼顾计算效率.为此,基于国产高性能离散元软件MatDEM开发了GPU并行FEM-DEM耦合计算程序,并结合颗粒孔隙分形特征对计算参数和结果进行分析.首先,采用多重分形理论研究了颗粒孔隙空间分布特征,确定了关键分形指标.其次,通过单元和双轴压缩试验验证了FEM-DEM耦合程序的可靠性.最后,基于双轴压缩试验研究了不同位置处表征元(Representative Volume Element,RVE)的细观响应.结果表明,RVE内孔隙空间分布具有多重分形特征,当颗粒数量超过400时,孔隙空间分布的自相似性确保了RVE内颗粒集合均匀化后输出应力-应变响应的稳定性.容量维数D_(0)和奇异指数α_(0)由于表征孔隙分布的平均信息而与RVE体应变具有线性相关性,可作为反映颗粒材料空间特征复杂性的简洁内变量.研究结果为分析工程尺度颗粒堆积体的宏-细观力学联系提供了一种方法探索.展开更多
基金Financial supports from the Natural Science Foundation of China(41761134089,41977218)Six Talent Peaks Project of Jiangsu Province(RJFW-003)the Fundamental Research Funds for the Central Universities(14380103)are gratefully acknowledged.
文摘Discrete element method can effectively simulate the discontinuity,inhomogeneity and large deformation and failure of rock and soil.Based on the innovative matrix computing of the discrete element method,the highperformance discrete element software MatDEM may handle millions of elements in one computer,and enables the discrete element simulation at the engineering scale.It supports heat calculation,multi-field and fluidsolid coupling numerical simulations.Furthermore,the software integrates pre-processing,solver,postprocessing,and powerful secondary development,allowing recompiling new discrete element software.The basic principles of the DEM,the implement and development of the MatDEM software,and its applications are introduced in this paper.The software and sample source code are available online(http://matdem.com).
文摘岩土颗粒材料的力学响应呈现多尺度特性,开展有限元法(Finite Element Method,FEM)和离散元法(Discrete Element Method,DEM)耦合的多尺度模拟可在反映多尺度响应的同时兼顾计算效率.为此,基于国产高性能离散元软件MatDEM开发了GPU并行FEM-DEM耦合计算程序,并结合颗粒孔隙分形特征对计算参数和结果进行分析.首先,采用多重分形理论研究了颗粒孔隙空间分布特征,确定了关键分形指标.其次,通过单元和双轴压缩试验验证了FEM-DEM耦合程序的可靠性.最后,基于双轴压缩试验研究了不同位置处表征元(Representative Volume Element,RVE)的细观响应.结果表明,RVE内孔隙空间分布具有多重分形特征,当颗粒数量超过400时,孔隙空间分布的自相似性确保了RVE内颗粒集合均匀化后输出应力-应变响应的稳定性.容量维数D_(0)和奇异指数α_(0)由于表征孔隙分布的平均信息而与RVE体应变具有线性相关性,可作为反映颗粒材料空间特征复杂性的简洁内变量.研究结果为分析工程尺度颗粒堆积体的宏-细观力学联系提供了一种方法探索.
