个人信息Personal Information
教授
博士生导师
硕士生导师
任职 : 海洋油气工程国际合作联合实验室主任
性别:男
毕业院校:大连理工大学
学位:博士
所在单位:建设工程学院
电子邮箱:ghdong@dlut.edu.cn
Vortex Formation in the Wake of a Streamwisely Oscillating Cylinder in Steady Flow
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论文类型:会议论文
发表时间:2016-01-01
收录刊物:CPCI-S、SCIE
页面范围:429-434
关键字:Oscillation; Lock-on; Synchronization; Flow structure
摘要:This study presents the vortex formation in the wake of a cylinder undergoing streamwise oscillations in steady flow. It is found that the global wake structure possesses a spatial-temporal symmetry over N periods of cylinder oscillation when sub-harmonic synchronizations occur. The sub-harmonic synchronization modes are characterized by shedding of M pairs (1 <= M < N) of vortices in N periods of cylinder oscillation. The wake of M/N modes is comprised of vortex groups of M vortices arranged in a similar way to Karman vortex street. The lift force shows excellent periodicity when lock-on occurs, and presents multiple peaks in its spectrum. The primary flow mechanism responsible for the sub-harmonic lock-on is identified as the interaction of the small sized shear bands induced by the cylinder oscillation with the shear layers induced by the steady flow.