湍流边界层中重粒子弥散的随机模型  

A Stochastic Model of Heavy Particle Dispersion in Turbulent Boundary Layer

作　　者：郭宇[1] 崔桂香[1] 许春晓[1] 张兆顺[1] Michel Ayrault 

机构地区：[1]清华大学工程力学系,北京100084 [2]里昂中央理工大学

出　　处：《计算物理》2004年第6期515-522,共8页Chinese Journal of Computational Physics

摘　　要：　在重粒子轨道模型的基础上,引入了Saffman力,并考虑了粒子 固壁碰撞和粒子 粒子碰撞的影响,建立了重粒子运动方程,耦合湍流脉动的随机方程,发展了重粒子弥散的随机模型,并在湍流边界层中考察该模型.将数值计算结果与实验结果进行比较,同时考察了Saffman力和粒子碰撞对计算结果的影响.A stochastic model of heavy particle dispersion is proposed.It is based on the coupling of the stochastic equation of turbulent fluid motion with the heavy particle crossing trajectory equation in which Saffman force,particle-wall collision and particle-particle collision are included.The model is also tested in a turbulent boundary layer with heavy particles.The numerical results are in good agreement with previous experimental data.The effect of Saffman force and particle collision on the heavy particle dispersion is investigated numerically as well.

关 键 词：粒子碰撞 湍流边界层 运动方程 随机模型 弥散 轨道模型 数值计算 重粒子 影响 实验结果 

分 类 号：O357[理学—流体力学] O359[理学—力学]