Nonlinear perturbation developments in flow around a vibrating cylinder
作者机构:State Key Laboratory of Fluid Power and Mechatronic SystemsDepartment of MechanicsZhejiang UniversityHangzhou 310027China Faculty of EngineeringUniversity of NottinghamNottinghamUK
出 版 物:《Journal of Hydrodynamics》 (水动力学研究与进展B辑(英文版))
年 卷 期:2021年第33卷第6期
页 面:1129-1138页
核心收录:
学科分类:080103[工学-流体力学] 08[工学] 080104[工学-工程力学] 081502[工学-水力学及河流动力学] 0815[工学-水利工程] 0701[理学-数学] 0801[工学-力学(可授工学、理学学位)]
基 金:Projects supported by the National Natural Science Foundation of China(Grant Nos.11772299 11922212)
主 题:Vortex induced vibration nonlinear optimal perturbation Orr mechanism
摘 要:We investigate the flow around a circular cylinder vibrating with a prescribed magnitude and frequency at Reynolds number *** Navier-stokes equations and the adjoint equations are solved to search for the 3-D nonlinear optimal initial perturbation,which is amplified by the attached shear via the Orr mechanism and then activates wake *** energy growth and the spanwise distributions of the nonlinear optimal perturbation vary significantly with the initial phase to introduce the *** the initial perturbation energy increases,linear amplification,nonlinear saturation and nonlinear growth are sequently *** last one is owing to the generation of a spanwise homogeneous mode,which modifies the pressure distributions on the cylinder surface and induces an extra lift ***,at all the initial phases,this force is opposite to the acceleration of the cylinder,illustrating the potential to reduce the magnitude of vibration.