讲座主题：离散元开源程序及其在工程中的应用
时间：2015年12月30日（周三）上午9:30-11:00
地点：延长校区西部仪表楼（土木工程系）208讲演厅
报告人：陈枫 博士（Louisiana State University, USA）
报告人简介：陈枫博士在同济大学获得学士学位和硕士学位，2009年在美国田纳西大学获得博士学位。陈枫博士研究领域为土木工程中的数值模拟方法，包括离散元，有限元/有限插分/有限体积法，计算流体动力学等。陈枫博士目前是路易斯安那州立大学的计算科学家，维护路易斯安那州立大学的高性能计算机（HPC）。
报告摘要：The Discrete Element Method (DEM) is a numerical method used in civil engineering. The usage of open source DEM package has drawn wide attention during the last decade. This presentation will introduce 3 major open source DEM packages including YADE-OpenDEM, ESyS-Particle and LIGGGHTS/CFDEM with a few of their engineering applications.
The study starts with the verification of the open source 3D DEM code (YADE) by investigating simple, one and two-particle contact problems, and DEM results are shown to compare very well with the classical 1D vibration solutions. This is followed by an investigation of a fluid-solid two phase flow system. The fluid phase is modeled by solving the averaged Navier-Stokes equation using the Finite Volume Method (FVM) and the solid phase was modeled using the DEM. 1D solutions for the classic upward seepage flow and consolidation were obtained and compared well with the analytical solutions. The coupled DEM-CFD code is then used in the solution of a classical 2D seepage problem of flow beneath a sheet pile and the slurry packing of a chromatography column. Finally, two engineering examples: uni-axial compression of biomass using ESyS-Particle and the 3D simulation of sedimentation process using LIGGGHTS/CFDEM on high performance computers (HPC) will be briefly introduced.