The effects of cactus inspired spines on the aerodynamics of a cylinder |
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| Institution: | 1. Department of Civil, Chemical & Environmental Engineering, University of Genova, Italy;2. Centre for Interdisciplinary Sciences, Tata Institute of Fundamental Research, Hyderabad, India;1. School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore 639798, Republic of Singapore;2. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong SAR, China;3. Singapore Institute of Technology, Singapore 179104, Republic of Singapore |
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| Abstract: | The effect of cactus-like spines on the topology and the dynamics of the flow past a stationary or pivoted cylinder are experimentally studied. The experiments are performed either in a water channel or a wind tunnel at low to moderate Reynolds number (390–12 500). The instantaneous velocity field is recorded using TR-PIV and investigated for three different configurations: no spines, short spines (0.1D) and long spines (0.2D). The results show how the spines are able to slow the flow past the cylinder and then increase the recirculation area by up to 128% while the maximum fluctuating kinetic energy intensity is decreased by up to 35%. Moreover, the spines have a significant effect on the vortex shedding and the dynamic pressure at the surface of the cylinder, thus significantly reducing both the amplitude and the frequency at which a pivoted cylinder oscillates. |
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| Keywords: | VIV Vortex shedding Pivoted cylinder Spines Cactus |
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