摘要
伴随着全球气候变暖,雪崩灾害的风险逐渐增加。因此,调查雪崩的发展规律和内在机理十分迫切和必要。而使用实验的方法来研究往往效率低下,并且只能获得宏观数据。为了更深入地了解雪崩效应,提出结合计算机仿真技术和转鼓雪崩实验,通过建立基于离散元法(DEM)的仿真模型来模拟发生雪崩时的颗粒流态。通过运用Hertz-Mindlin接触理论和牛顿第二定律塑造的仿真模型以及在相同配置下的物理实验的对比,证明了离散元法研究雪崩效应的有效性。基于该模型,我们跟踪每个颗粒的运动状态,并研究了自由表面上参与雪崩的颗粒数量的变化。参与雪崩的颗粒数量的增长速度经历了先增加,然后恒定,最后减少的过程。我们还发现不同区域内的颗粒平均速度随时间都呈现先增大后减小的规律。离散元仿真方法为雪崩颗粒流的研究提供了参考。
With global warming, the risk of avalanche disasters is increasing. Therefore, it is urgent and necessary to investigate the development rule and internal mechanism of avalanches. Studing by experimental methods is often inefficient and can only obtain macro-data. In order to learn more about the avalanche effect, a combination of computer simulation technology and drum avalanche experiments is proposed. The particle flow pattern during an avalanche is simulated by establishing a simulation model based on the discrete element method(DEM). By comparing the simulation model using Hertz-Mindlin contact theory and Newton’s second law with the physical experiments under the same configuration, the validity of studing avalanche effect by discrete element method is proved. Based on this model, we track the motion of each particle and investigate the quantitative change of particles involved in avalanches on the free surface. The growth rate of avalanching particles number experiences a process of increasing, then stabilizing, and finally reducing. We also find that the average velocity of particles in different regions increase at first and then decrease. The discrete element method provides a reference for the research of avalanche particle flow.
作者
冯靖禹
韩韧
张宇峰
辛昱鋆
FENG Jing-yu;HAN Ren;ZHANG Yu-feng;XIN Yu-yun(School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《软件》
2020年第7期264-268,共5页
Software
关键词
水平转鼓
雪崩
仿真
离散元法
Horizontal rotating drum
Avalanche
Simulation
Discrete element method
