摘要
In the present review, recent progress on the vortex identification methods are introduced with a focus on the newly proposed omega method（ Ω method）. The advantages of Ω method are summarized with many illustrating examples. Furthermore, comparing with other existing methods（e.g., Q criterion and λ2 criterion）, one of the characteristics of Ω method is its independence on the chosen threshold values for vortex identifications. The important parameters involved for the practical applications of Ω method are further discussed in detail together with the physical interpretation of the Ω and some suggestions of the future work. Other emerging topics（e.g., Lagrangian coherent structure and Rortex） are also introduced with comments.
In the present review, recent progress on the vortex identification methods are introduced with a focus on the newly proposed omega method（ Ω method）. The advantages of Ω method are summarized with many illustrating examples. Furthermore, comparing with other existing methods（e.g., Q criterion and λ2 criterion）, one of the characteristics of Ω method is its independence on the chosen threshold values for vortex identifications. The important parameters involved for the practical applications of Ω method are further discussed in detail together with the physical interpretation of the Ω and some suggestions of the future work. Other emerging topics（e.g., Lagrangian coherent structure and Rortex） are also introduced with comments.
作者
张宇宁
裘勖
陈飞鹏
刘凯华
张宇宁
董祥瑞
Chaoqun Liu
Yu-ning Zhang;Xu Qiu;Fei-peng Chen;Kai-hua Liu;Yu-ning Zhang;Xiang-rui Dong;Chaoqun Liu(Key Laboratory of Condition Monitoring and Control for Power Plant Equipment（Ministry of Education）,School of Energy,Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China;Beijing South-to-North Water Diversion Tuancheng Lake Management Office,Beij＇ing 100195,China;College of Mechanical and Transportation Engineering,China University of Petroleum-Beijing,Beijing 102249,China;Beijing Key Laboratory of Process Fluid Filtration and Separation,China University of Petroleum-Beijing,Beijing 102249,China;National Key Laboratory of Transient Physics,Nanjing University of Science and Technology,Nanjing 210094,China;Department of Mathematics,University of Texas at Arlington,Arlington,Texas,USA)
基金
Project supported by the National Natural Science Foundation of China(Grant Nos.51506051,51606221)
