Title: Response characteristics of vortex around the fixed and freely rotating rectangular cylinder with different width to height ratios

Authors: Yong Gap Park; Gwansik Min; Man Yeong Ha; Hyun Sik Yoon

Addresses: School of Mechanical Engineering, Pusan National University, Jang Jeon 2-Dong, Geum Jeong Gu, Busan 609-735, Republic of Korea ' School of Mechanical Engineering, Pusan National University, Jang Jeon 2-Dong, Geum Jeong Gu, Busan 609-735, Republic of Korea ' School of Mechanical Engineering, Pusan National University, Jang Jeon 2-Dong, Geum Jeong Gu, Busan 609-735, Republic of Korea ' Global Core Research Center for Ships and Offshore Plants, Pusan National University, Jang Jeon 2-Dong, Geum Jeong Gu, Busan 609-735, Republic of Korea

Abstract: This paper presents a numerical investigation for the response characteristics of vortex around the fixed and freely rotating rectangular cylinder about a fixed axis through its centroid. The direct-forcing/fictitious domain (DF/FD) method is used to realise fluid-structure interaction (FSI) problem. In order to identify the effect of Reynolds number and width to height ratio on the flow characteristics and structure motion by FSI, we consider flow over a rectangular cylinder in the range of 50 ≤ Re ≤ 150 and 0.2 ≤ W/H ≤ 1.0, where Re and W/H are the Reynolds number and the width to height ratio. We also compare the freely rotating cylinder case with the fixed cylinder case. In the freely rotating case, the motion of rectangular cylinder is classified into the two different regimes. In the first regime, the rectangular cylinder exhibits periodic oscillation behaviour. In the second regime, it reveals autorotation. All the cases show the periodic oscillation behaviour except the cases of Re = 100 and 150 with W/H = 1.0 whose motion is autorotation.

Keywords: fluid-structure interaction; FSI; width to height ratios; vortex shedding; response characteristics; rotating rectangular cylinders; periodic oscillation; autorotation.

DOI: 10.1504/PCFD.2015.067328

Progress in Computational Fluid Dynamics, An International Journal, 2015 Vol.15 No.1, pp.1 - 9

Received: 08 May 2021
Accepted: 12 May 2021

Published online: 04 Feb 2015 *

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