不同大小粒子之间相互作用的直接数值模拟  

Interactions Between Two Sedimenting Particles With Different Sizes

作　　者：邵雪明[1] 刘杨[1] 余钊圣[2] 

机构地区：[1]浙江大学力学系,杭州310027 [2]悉尼大学机械工程系

出　　处：《应用数学和力学》2005年第3期372-378,共7页Applied Mathematics and Mechanics

基　　金：国家自然科学基金资助项目(10472104);浙江省自然科学基金资助项目(101047)

摘　　要：　应用改进的拉格朗日乘子/虚拟区域算法对不同大小的两个圆形粒子在二维方槽中的沉降过程和相互作用进行了直接数值模拟,并进行了实验验证·　结果表明不同大小的两个粒子在沉降过程中的相互作用可以描述为追尾、接触、旋转和分离4个过程,只有当两个粒子尺度差异很小时,才会重复进行DKT过程·　在两个粒子相互作用的过程中,小粒子的运动受到大粒子的影响更剧烈一些。An improved implementation of Distributed Lagrange multiplier/fictitious domain method was presented and used to simulate the interactions between two circular particles sedimenting in a two-dimensional channel. The simulation results were verified by comparison with experiments. The results show that the interactions between two particles with different sizes can be described as drafting, kissing, tumbling and separating. Only for small diameter ratio, the two particles will interact undergoing repeated DKT process. Otherwise, the two particles will separate after their tumbling. The results also show that, during the interaction process, the motion of the small particle is strongly affected while the large particle is affected slightly.

关 键 词：粒子运动 直接数值模拟 相互作用 沉降过程 拉格朗日乘子 实验验证 二维 影响 大小 分离 

分 类 号：O357[理学—流体力学] O572[理学—力学]