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Flow Behavior Behind A Freely suspended cylinder in the Wake of A Stationary cylinder

China Ocean Engineering 2020年第5期34卷 708-717页

作者： GAO Yang-yang CHEN Wei-yi TAN Soon Keat ZHANG Bao-feng Ocean College Zhejiang UniversityZhoushan 316021China Maritime Research Centre School of Civil Environmental EngineeringNanyang Technological University639798Singapore Powerchina Huadong Engineering Corporation Limited Hangzhou 311122China

The experiment of flow past a freely suspended circular cylinder in the wake of an upstream stationary cylinder was carried out in a re-circulating water channel using the Particle Image Velocimetry(PIV) technique. The upstream cylinder was fixed, while the downstream cylinder was suspended from a platform and allowed to move freely in the horizontal plane. The centre-to-centre spacing ratio between two tandem cylinders was initially kept at a constant value of 3.0. The instantaneous flow field and the orbital trajectories were analyzed to reveal the effect of the presence of the upstream cylinder and flow velocity on the dynamic response of the downstream suspended *** results showed that the upstream stationary cylinder has significant effect on modifying the flow patterns behind two tandem cylinders. Different trajectories of the downstream suspended cylinder with variation of flow velocity U were observed, such as:(1) depicting a figure-8 type motion at U = 0.27 m/s;(2) undergoing intermittent oscillations as it travels downstream at 0.3 m/s ≤ U ≤ 0.37 m/s;(3) successive moving downstream, no obvious streamwise oscillation observed at U = 0.43 m/s.

关键词： downstream suspended cylinder PIV camera orbital response flow pattern

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Flow Behavior behind a Freely suspended cylinder in the Wake of a Stationary cylinder

Flow Behavior behind a Freely Suspended Cylinder in the Wake...

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第十三届全国水动力学学术会议暨第二十六届全国水动力学研讨会

作者： GAO Yang-yang Danielle S.TAN TAN Soon Keat Ocean College Zhejiang University State Key Laboraory of Satellite Ocean Environment Dynamics (Second Institute of Oceanography SOA) Department of Mechanical Engineering National University of Singapore Nanyang Environment and Water Research Institute Nanyang Technological University Maritime research Centre School of Civil and Environmental EngineeringNanyang Technological University

Experiments studying the flow past a freely suspended circular cylinder in the wake of an upstream stationary cylinder were carried out in a re-circulating water channel. The upstream cylinder was fixed, while the downstream cylinder was suspended from a platform and allowed to move freely in the horizontal plane. The centre-to-centre spacing ratio between two cylinders was kept at a constant value of 3.0. The Particle Image Velocimetry(PIV) technique and camera were used to capture the flow field and trajectory of the downstream cylinder, respectively. The effects of upstream stationary cylinder on the orbiting response and vortex wake mode of the downstream suspended cylinder were examined.

关键词： downstream suspended cylinder Wake of stationary cylinder Orbiting response PIV Flow behavior

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