Flow characteristics around a circular cylinder undergoing vortex-induced vibration in the initial branch
Vortex-induced vibration (VIV) has been studied extensively and much attention has been devoted to the “lock-in” phenomenon, which is primarily responsible for fatigue damage to structures. Nevertheless, the behavior of the surrounding flow can also be important. This paper investigates the flow cha...
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Format: | Journal Article |
Language: | English |
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2018
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Online Access: | https://hdl.handle.net/10356/87426 http://hdl.handle.net/10220/44435 |
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author | Hsieh, Shih-Chun Low, Ying Min Chiew, Yee-Meng |
author2 | School of Civil and Environmental Engineering |
author_facet | School of Civil and Environmental Engineering Hsieh, Shih-Chun Low, Ying Min Chiew, Yee-Meng |
author_sort | Hsieh, Shih-Chun |
collection | NTU |
description | Vortex-induced vibration (VIV) has been studied extensively and much attention has been devoted to the “lock-in” phenomenon, which is primarily responsible for fatigue damage to structures. Nevertheless, the behavior of the surrounding flow can also be important. This paper investigates the flow characteristics of the wake in the initial branch for a vibrating cylinder using a new PIV technique capable of a high sampling rate of 200 Hz. The experiments were carried out over a wide range of reduced velocities to better understand the important trends. The mean velocities and turbulence characteristics were obtained by ensemble averaging repeated velocity measurements. This study reveals new insights on the flow characteristics of the wake in the initial branch. In particular, the cylinder vibration is found to lead to the formation of oblique jets, which have a profound influence on the mean flow velocity, turbulence intensity, formation and convection of the vortices, and variations to the stagnation and separation points of the cylinder during vibration. |
first_indexed | 2024-10-01T07:46:53Z |
format | Journal Article |
id | ntu-10356/87426 |
institution | Nanyang Technological University |
language | English |
last_indexed | 2024-10-01T07:46:53Z |
publishDate | 2018 |
record_format | dspace |
spelling | ntu-10356/874262020-03-07T11:43:36Z Flow characteristics around a circular cylinder undergoing vortex-induced vibration in the initial branch Hsieh, Shih-Chun Low, Ying Min Chiew, Yee-Meng School of Civil and Environmental Engineering Maritime Institute Vortex-induced Vibration Particle Image Velocimetry Vortex-induced vibration (VIV) has been studied extensively and much attention has been devoted to the “lock-in” phenomenon, which is primarily responsible for fatigue damage to structures. Nevertheless, the behavior of the surrounding flow can also be important. This paper investigates the flow characteristics of the wake in the initial branch for a vibrating cylinder using a new PIV technique capable of a high sampling rate of 200 Hz. The experiments were carried out over a wide range of reduced velocities to better understand the important trends. The mean velocities and turbulence characteristics were obtained by ensemble averaging repeated velocity measurements. This study reveals new insights on the flow characteristics of the wake in the initial branch. In particular, the cylinder vibration is found to lead to the formation of oblique jets, which have a profound influence on the mean flow velocity, turbulence intensity, formation and convection of the vortices, and variations to the stagnation and separation points of the cylinder during vibration. Accepted version 2018-02-12T07:56:02Z 2019-12-06T16:41:37Z 2018-02-12T07:56:02Z 2019-12-06T16:41:37Z 2016 Journal Article Hsieh, S.-C., Low, Y. M., & Chiew, Y.-M. (2017). Flow characteristics around a circular cylinder undergoing vortex-induced vibration in the initial branch. Ocean Engineering, 129, 265-278. 0029-8018 https://hdl.handle.net/10356/87426 http://hdl.handle.net/10220/44435 10.1016/j.oceaneng.2016.11.019 en Ocean Engineering © 2016 Elsevier Ltd. This is the author created version of a work that has been peer reviewed and accepted for publication by Ocean Engineering, Elsevier Ltd. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [http://dx.doi.org/10.1016/j.oceaneng.2016.11.019]. 47 p. application/pdf |
spellingShingle | Vortex-induced Vibration Particle Image Velocimetry Hsieh, Shih-Chun Low, Ying Min Chiew, Yee-Meng Flow characteristics around a circular cylinder undergoing vortex-induced vibration in the initial branch |
title | Flow characteristics around a circular cylinder undergoing vortex-induced vibration in the initial branch |
title_full | Flow characteristics around a circular cylinder undergoing vortex-induced vibration in the initial branch |
title_fullStr | Flow characteristics around a circular cylinder undergoing vortex-induced vibration in the initial branch |
title_full_unstemmed | Flow characteristics around a circular cylinder undergoing vortex-induced vibration in the initial branch |
title_short | Flow characteristics around a circular cylinder undergoing vortex-induced vibration in the initial branch |
title_sort | flow characteristics around a circular cylinder undergoing vortex induced vibration in the initial branch |
topic | Vortex-induced Vibration Particle Image Velocimetry |
url | https://hdl.handle.net/10356/87426 http://hdl.handle.net/10220/44435 |
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