A study on turbulence modulation via an analysis of turbulence anisotropy-invariants  

作　　者：Michael MANHART 

机构地区：[1]Fachgebiet Hydromechanik, Technische Universitaet Muechen, Munich 80333, Germany

出　　处：《Science China(Physics,Mechanics & Astronomy)》2010年第3期508-513,共6页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 50706021);the Ph.D. Programs Foundation of Ministry of Education of China (Grant No. 20070003018);the Scientific Research Foundation for the Returned Overseas Chinese Scholars, Ministry of Education of China;a (TNList) Cross-discipline Foundation

摘　　要：We investigate the turbulence modulation by particles in a turbulent two-phase channel flow via an analysis of turbulence anisotropy-invariants. The fluid turbulence is calculated by a large eddy simulation with a point-force two-way coupling model and particles are tracked by the Lagrangian trajectory method. The channel turbulence follows the two-component turbulence state within the viscous sub-layer region and outside the region the turbulence tends to follow the right curve of the anisotropy-invariant. The channel turbulence, interacting with heavy particles, is modulated to the two-component turbulence limit state near the wall and is separate from the axisymmetric turbulence state in the turbulence anisotropy-invariants map. The fluctuations of streamwise component are transferred to the other two components and hence the anisotropy decreases due to particle modulation. The study has deepened the understanding of the turbulence modulation mechanism in two-phase turbulent flows.We investigate the turbulence modulation by particles in a turbulent two-phase channel flow via an analysis of turbulence anisotropy-invariants. The fluid turbulence is calculated by a large eddy simulation with a point-force two-way coupling model and particles are tracked by the Lagrangian trajectory method. The channel turbulence follows the two-component turbulence state within the viscous sub-layer region and outside the region the turbulence tends to follow the right curve of the anisotropy-invariant. The channel turbulence, interacting with heavy particles, is modulated to the two-component turbulence limit state near the wall and is separate from the axisymmetric turbulence state in the turbulence anisotropy-invariants map. The fluctuations of streamwise component are transferred to the other two components and hence the anisotropy decreases due to particle modulation. The study has deepened the understanding of the turbulence modulation mechanism in two-phase turbulent flows.

关 键 词：TURBULENCE modulation TURBULENCE ANISOTROPY TURBULENT TWO-PHASE channel flow large EDDY simulation two-way coupling 

分 类 号：O357.5[理学—流体力学]