基于高性能计算的离散介质冲击过程

Impact Process of Discrete Media Based on HPC

基于高性能计算平台,数值模拟离散介质冲击过程,研究颗粒的恢复系数随冲击速度、颗粒尺度分布的变化规律。结果发现,给定冲击速度时,无论单分散还是多分散颗粒,随着链长度增加,颗粒的恢复系数逐渐达到稳定,只与冲击速度以及所冲击的颗粒的尺寸比相关,并且压缩阶段的冲量是一个不随链长度变化的定值。在此状态下,入射颗粒与链冲击后的恢复系数尽管随冲击速度增加而减小,却远大于与无限大半空间固体壁面冲击的恢复系数。对于多分散链恢复系数,其分布呈现典型的高斯分布的形式,并且该分布与颗粒的初始冲击速度以及颗粒的粒径比有关。

Based on a HPC platform,the impact process of discrete media is numerically simulated,and the variation law of particle’s coefficient of restitution(CORs)with impact velocity,particle size distribution is studied.It is found that for a given impact velocity,regardless of monodispersed or multi-dispersed particles,with the increasing of chain’s length,the COR of the particles gradually reached stable,which is only related to the impact velocity and the size ratio of the impacted particles,and the impulse of the compression stage is a stable value which does not vary with chain’s length.At that condition,the COR after the impact between the incident particle and the chain decreases with the increasing of the impact velocity,but it is much larger than the COR of the impact with an infinite half-space solid wall.For the multi-dispersed chain’s COR,its distribution is in the form of a typical Gaussian distribution,and the distributions are related to the impact velocities and the size ratio of the impacted particle.