Three-Dimensional Bursting Phenomena in Meander Channel  

作　　者：刘小谢 白玉川 

机构地区：[1]State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University [2]Institute for Sedimentation on River and Coastal Engineering, Tianjin University

出　　处：《Transactions of Tianjin University》2013年第1期17-24,共8页天津大学学报（英文版）

基　　金：Supported by National Natural Science Foundation of China(No.50979066 and No.51279124);Foundation for Creative Research Groups of National Natural Science Foundation of China(No.51021004)

摘　　要：Experiments were conducted in a U-shaped open-channel flume with the intention of investigating the bursting phenomena in the meander channel. The experimental results of the secondary flow fields and the Reynolds shear stress distributions show that the velocity and velocity fluctuation in the transverse direction are not negligible. Moreover, the bursting process is investigated using the three-dimensional quadrant analysis, which is more accurate than using the traditional two-dimensional quadrant analysis for the meandering channel. It is obtained from the experimental results that the internal group of events occurs more frequently than the external group, particularly the internal ejection and internal sweep events. In addition, the transition probabilities of the movements, which are defined as the changes of events from the current situation to the next situation in a time series, show that the stable organizations of events are the most possible movements, whereas the cross organizations of events have the least possible movements.Experiments were conducted in a U-shaped open-channel flume with the intention of investigating the bursting phenomena in the meander channel. The experimental results of the secondary flow fields and the Reynolds shear stress distributions show that the velocity and velocity fluctuation in the transverse direction are not negligible. Moreover, the bursting process is investigated using the three-dimensional quadrant analysis, which is more accurate than using the traditional two-dimensional quadrant analysis for the meandering channel. It is obtained from the experimental results that the internal group of events occurs more frequently than the external group, particularly the internal ejection and internal sweep events. In addition, the transition probabilities of the movements, which are defined as the changes of events from the current situation to the next situation in a time series, show that the stable organizations of events are the most possible movements, whereas the cross organizations of events have the least possible movements.

关 键 词：meander channel  bursting phenomena  turbulent characteristics  three-dimension 

分 类 号：TV133[水利工程—水力学及河流动力学]