Numerical Simulation of the Formation of Shock Induced Particle Jets Using the Discrete Element Method

摘要：

　　The dispersal of a cylindrical particle ring by a blast or shock wave induces the formation of coherent structures which take the form of particle jets.The formation of particle jets occurs during the shock wave transit times, making it almost inaccessible to the experimental observation.By the discrete element method (DEM), we performed a quasi-two-dimensional numerical simulation of the shock dispersal of the short cylindrical particle rings.Our study found that during the first hundreds of microseconds, particles around the inner ring surface begin to exhibit the velocity discrepancy.The fast moving particles squeeze into the interior regions, constituting the incipient particle jets.During the outward propagation, the tips of particle jets become blunt, even branch into multiple sub-jets, leading to the increase of the jet number which is a function of the impulsive pressure.The origin of particle jets can be attributed to the heterogeneous network of stress chains which precipitates the non-uniform distribution of particle velocities along the circumference.

关键词： particle ring particle jets discrete element method non-uniform distribution

作者: XUE Kun SUN Lei

作者单位: State Key Laboratory of Explosive Science and Technology, Beijing Institute of Technology, Beijing 100081, China

会议类型: 国际会议

会议名称: The 2016 International Symposium on Safety Science and Technology(2016安全科学与技术国际会议)

会议地点: 昆明

会议语种:英文

页码: 703-707

在线出版日期: 2016-10-17（万方平台首次上网日期，不代表论文的发表时间）