摘要
为了对方形粒子在二维垂直通道中的沉降运动特性进行研究,应用了拉格朗日乘子/虚拟区域方法对不同初始取向角、不同长宽比情况下方形粒子的沉降运动进行了直接数值模拟.结果表明,在所模拟的雷诺数下,方形粒子在二维通道中自由沉降的平衡位置为通道的中心线,粒子在沉降的初始阶段存在横向漂移.粒子的初始取向角和长宽比对其沉降过程有较大影响.初始取向角和长宽比增大,则粒子的横向漂移以及取向角、侧向漂移速度和转动角速度的振荡幅度都增大;同时随着长宽比的增大,粒子的沉降速度相应减小.
The settling behaviors of a rectangular particle with different initial orientation angles and length-width ratios were simulated by using distributed Lagrange multiplier/fictitious domain method. The obtained results show that the final equilibrium position of rectangular particle is the center of the channel under the obtained Reynolds, but there exists lateral motion at the beginning of the sedimentation. The settling behaviors of the rectangular particle were affected significantly by the initial orientation angle and length-width ratio. With the increasing initial orientation angle and length-width ratio, the drifting distance, the fluctuation of the orientation angle, lateral drifting velocity and rotation velocity all increase, while the final settling velocity decreases with the increasing length-width ratio.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2005年第3期453-456,460,共5页
Journal of Zhejiang University：Engineering Science
基金
国家自然科学基金资助项目(10472104).
关键词
方形粒子
沉降
拉格朗日乘子/虚拟区域方法
Computer simulation
Lagrange multipliers
Mathematical models
Numerical methods
Pressure distribution
Sedimentation
Velocity measurement
