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A comparison between DNS derived and measured streamwise oscillating-cylinder wake

Yu Zhou
Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong; Institute for Turbulence-Noise-Vibration Interaction and Control Shenzhen Graduate School, Harbin Institute of Technology Shenzhen, 518055, China

Song Fu
Department of Engineering Mechanics, School of Aerospace Engineering, Tsinghua University, Beijing, 100084, China

Shi-Hong Liu
Department of Engineering Mechanics Tsinghua University, Beijing 100084, China

Y Liu
Dept. of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong


The wake of a streamwise oscillating cylinder is presently investigated. The Reynolds number, based the cylinder diameter d, investigated is 300. The cylinder oscillates at an amplitude of 0.5d and a frequency fe/fs, where fe is the cylinder oscillating frequency and fs is the natural vortex shedding frequency of a stationary cylinder. Under these conditions the flow is essentially two dimensional. A two-dimensional direct numerical simulation (DNS) scheme has been developed to calculate the flow. The DNS results display a street of vortices symmetrical about the centreline, each containing two counter-rotating structures, which is in excellent agreement with measurements. The drag and lift on the cylinder have also been examined.