Large-eddy simulations and vortex structures of turbulent jets in crossflow

作     者：GUAN Hui1,2 & WU ChuiJie2 1 School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China 2 Research Center for Fluid Dynamics,PLA University of Science and Technology,Nanjing 211101,China 

作者机构：School of Mechanical and Power Engineering East China University of Science and Technology Shanghai China Research Center for Fluid Dynamics PLA University of Science and Technology Nanjing China 

出 版 物：《Science China(Physics,Mechanics & Astronomy)》 (中国科学：物理学、力学、天文学（英文版）)

年 卷 期：2007年第50卷第1期

页      面：118-132页

核心收录：

学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）] 

基　　金：Supported by the National Natural Science Foundation of China (Grant No. 19472077) the Key Project of the Natural Science Foundation of Jiangsu Province (Grant No. BK2003208) 

主　　题：turbulent jet in crossflow coherent structure large-eddy simulation 

摘      要：Using the method of large-eddy simulation, the 3-dimensional turbulent jets in crossflow with stream-wise and transverse arrangements of nozzle are simulated, emphasizing on the dynamical process of generation and evolution of vortex structures in these flows. The results show that the basic vortex structures in literatures, such as the counter-rotating vortex pair, leading-edge vortices, lee-side vortices, hanging vortices, kidney vortices and anti-kidney vortices, are not independent physical substances, but local structures of the basic vortex structure of turbulent jets in crossflow-the 3-D stretching vortex rings originating from the orifice of the nozzle, which is discovered in this study. Therefore, the most important large-scale structures of turbulent jets in crossflow are unified to the 3-D vortex rings which stretch and twist in stream-wise and swing in transverse directions. We also found that the shedding frequencies of vortex rings are much lower than the one corresponding to the appearance of leading-edge and lee-side vortices in the turbulent jets.