EXPERIMENTAL STUDY OF FLOW STRUCTURE BEHIND A CIRCULAR CYLINDER WITH WAVY SURFACE BY PIV

作     者：ZHANG Wei Daichin ZHANG WeiDepartment of Mechanical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea DaichinShanghai Institute of Applied Mathematics and Mechanics, Shanghai University, Shanghai 200072, ChinaDepartment of Mechanical Engineering, Pohang University of Science and Technology, Pohang 790-784, Korea

作者机构：Department of Mechanical Engineering Pohang University of Science and Technology Pohang 790-784 Korea Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China 

出 版 物：《Journal of Hydrodynamics》 (水动力学研究与进展B辑（英文版）)

年 卷 期：2006年第18卷第1期

页      面：97-103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] 0801[工学-力学（可授工学、理学学位）] 

主　　题：wavy cylinder wake structure PIV 

摘      要：The wake behind a circular cylinder with wavy surface was investigated using single-frame PIV technique at Re=5200. The mean flow field and spatial distribution of turbulence statistics in the nodal, saddle and middle planes were presentcd and compared with those of a smooth cylinder. The near wake behind the wavy cylinder shows pronounced spanwise periodicity of flow structures. Compated with a smooth cylinder, the vortex formation region considerably expands in the streamwise direction, particularly reaching maxi mum in the saddle plane of the wavy cylinder. However, the longitudinal vortices in the nodal plane were noticeably suppressed in the transverse direction. In addition, the wake in the nodal plane contains the peak value of turbulent kinetic en ergy and the Reynolds shearing stress due to the intensive entrainment of free flow and the momentum exchange in the spanwise direction.