Direct numerical simulation of particle-fluid flows in turbulent mixing layer  

作　　者：ZHENG Youqu, FAN Jianren, ZHA Xudong and CEN Kefa(Department of Energy Engineering, Zhejiang University, Hangzhou 310027, China) 

出　　处：《Progress in Natural Science:Materials International》2002年第3期231-235,共5页自然科学进展·国际材料（英文版）

基　　金：Supported by the Major State Basic Research Development Program of China (Grant No. G 19990222)

摘　　要：The coherent structures of a three-dimensional temporally mixing layer and the associated dispersion patterns of particles are numerically studied using a pseudospectral method for fluid and the Lagrangian approach for tracing particles at different Stokes numbers without consideration of particle-particle interactions. The results show that the particles with Stokes number of the order of unity have the largest concentration near the outer edges of the large-scale spanwise vortex structures. The study validates the effect of the streamwise large-scale structures on the particle distribution along the spanwise and transverse directions and it enhances with the development of the three-dimensionality of the mixing layer, which results in a ‘mushroom’ shape of the particle distribution in the spanwise direction.The coherent structures of a three-dimensional temporally mixing layer and the associated dispersion patterns of particles are numerically studied using a pseudospectral method for fluid and the Lagrangian approach for tracing particles at different Stokes numbers without consideration of particle-particle interactions. The results show that the particles with Stokes number of the order of unity have the largest concentration near the outer edges of the large-scale spanwise vortex structures. The study validates the effect of the streamwise large-scale structures on the particle distribution along the spanwise and transverse directions and it enhances with the development of the three-dimensionality of the mixing layer, which results in a ' mushroom' shape of the particle distribution in the spanwise direction .

关 键 词：direct numerical simulation  particle dispersion  MIXING layer  PSEUDOSPECTRAL method  LAGRANGIAN approach. 

分 类 号：O572.2[理学—粒子物理与原子核物理]