基于SPH方法高速射流冲刷的模拟  

Numerical Simulation of High Speed Water Jets Erode Sand Bed Based on SPH

作　　者：张德义[1,2] 倪福生[1,2] 王辉[1,2] 顾磊 

机构地区：[1]疏浚技术教育部工程研究中心(河海大学) [2]河海大学机电工程学院,常州213022

出　　处：《科学技术与工程》2014年第24期165-168,194,共5页Science Technology and Engineering

基　　金：河海大学中央高校基本科研业务费项目(2013B19114)资助

摘　　要：针对有限单元法在处理大变形中的网格重构、网格畸变等问题的困难,采用SPH方法模拟高速射流冲刷过程。SPH方法是一种纯拉格朗日型的无网格粒子法,能够有效地避免大变形中的各种网格问题。采用该种方法主要模拟不同工况下的冲坑发展情况,冲刷对象选LS-DYNA中的MAT147材料模型。计算结果表明采用SPH方法可以形象、直观地反映高速射流冲刷的过程,并且能够清楚地描述粒子速度场和砂床内部压力场的演变,所得结果可以为高速淹没射流的研究提供参考。Due to the difficulty of grid reconstruction and distortion in large deformation using FEM,SPH was used to simulate the process of high speed water jets erode sand bed.SPH is a Lagrangian particle method without grid,it can avoid the problems in large deformation effectively.The method was used to simulate dynamic development of scour in the condition of different speed and height of water jet,and the MAT147 in LS-DYNA is chosen to be the material model of sand bed.The results show that SPH could describe the process vividly and intuitively,and can demonstrate evolution of particle velocity field and san bed pressure field clearly,which will be helpful for the research on high speed submerged water jets erosion.

关 键 词：光滑粒子动力学方法 高速射流冲刷 材料模型 粒子 

分 类 号：O358[理学—流体力学]