Passive increase in driving force in vortex-induced vibration of a semi-hollow cylinder for Reynolds number 200
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DOI 10.1007/s12206-020-0519-3
Journal of Mechanical Science and Technology 34 (6) 2020 Original Article DOI 10.1007/s12206-020-0519-3 Keywords: · Computational fluid dynamics · Fluid-structure interaction · Vortex-induced vibration · Energy harvester
Passive increase in driving force in vortex-induced vibration of a semi-hollow cylinder for Reynolds number 200 Seungmin Kang1 and Sungmin Ryu2 1
Correspondence to: Sungmin Ryu [email protected]
Citation: Kang, S., Ryu, S. (2020). Passive increase in driving force in vortex-induced vibration of a semi-hollow cylinder for Reynolds number 200. Journal of Mechanical Science and Technology 34 (6) (2020) 2435~2442. http://doi.org/10.1007/s12206-020-0519-3
Received October 23rd, 2019 Revised
February 26th, 2020
2
Department of Mechanical Engineering, Hanyang University, Seoul 04763, Korea, Department of Mechanical Engineering, Incheon National University, Incheon 22012, Korea
Abstract
We present a semi-hollow body as an effective strategy to increase the driving force for vortex-induced vibrations (VIVs) of a circular cylinder. The hollow-body concept is evaluated numerically at Reynolds number Re = 200 and in a range of reduced velocity 3 ≤ Ured ≤ 8 with a mass-spring system released to vibrate in the transverse direction. Our numerical solutions reveal that, compared with solid-cylinder counterparts, the net transverse force is increased significantly through the semi-hollow body. The transverse force acting on the inner surface is found to be developed as a consequence of semi-confined flows driven by the cylinder oscillation. Furthermore, it is shown that the inner force has a phase difference with respect to the force acting on the outer surface. Based on a systematic force analysis, the appreciable increase in the transverse force is attributed to the constructive interference between the inner and outer forces.
Accepted March 16th, 2020 † Recommended by Editor Yang Na
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
1. Introduction Engineering applications involving vortex-induced vibrations (VIVs) have multiplied. VIVs are regarded as destructive in designing structures in civil engineering [1], but recently, they have served as an energy conversion mechanism for energy harvesters [2]. As VIVs are considered undesirable or utilizable depending on engineering situations, suppression or amplification of the phenomenon is necessary for facilitating beneficial functions. Studies related to VIVs have hence been directed towards developing a method to control the phenomenon in a passive or active sense. An active VIV control has attracted as on-demand control is available through a manipulatable actuation. However, this effective approach requires input energy for the actuation. We then aim to find a cost-effective method to control VIVs in a passive sense, especially to achieve a significant level of amplification in the driving force. The comprehension of VIVs of a single rigid body forms the foun
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