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Experimental investigation of the effect of a downstream square plate on vortex-induced vibration and galloping of a square cylinder

A square cylinder exposed to a fluid flow is regarded as the simplest model of the structures in sea water or air flow, and known to show the Karman vortex induced vibration (KVIV) and the galloping in separate or overlapping ranges of flow velocity. In this study, wind tunnel experiments were perfo...

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Main Authors: Mohamed, A., Zaki, S. A., Shirakashi, M., Ali, M. S. M., Samsudin, M. Z., Mohammad, A. F.
Format: Article
Language:English
Published: Penerbit Akademia Baru 2020
Subjects:
T Technology (General)
Online Access:http://eprints.utm.my/id/eprint/87896/1/SheikhAhmadZaki2020_ExperimentalInvestigationOfTheEffectOfADownstream.pdf
http://eprints.utm.my/id/eprint/87896/
http://www.dx.doi.org/10.37934/arfmts.68.1.98113
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spelling my.utm.878962020-11-30T13:36:39Z http://eprints.utm.my/id/eprint/87896/ Experimental investigation of the effect of a downstream square plate on vortex-induced vibration and galloping of a square cylinder Mohamed, A. Zaki, S. A. Shirakashi, M. Ali, M. S. M. Samsudin, M. Z. Mohammad, A. F. T Technology (General) A square cylinder exposed to a fluid flow is regarded as the simplest model of the structures in sea water or air flow, and known to show the Karman vortex induced vibration (KVIV) and the galloping in separate or overlapping ranges of flow velocity. In this study, wind tunnel experiments were performed on the cross-flow vibration of a square cylinder, and effects of a downstream square plate on the vibration were investigated to develop a convenient passive technique for vibration control. The square plate has a side length w equal to the side length of the square cylinder D (= 26 mm) and set downstream with the gap ratio S/D in the range of 0.12 to 2.90 where S is the separation gap. The results show that the square plate has only little influence on KVIV and enhances the galloping, resulting in the lower critical reduced velocity of galloping Ug i.e. the onset velocity of galloping reduced to about half of the isolated counterpart at S/D = 0.98. Most remarkable effect of the downstream square plate is the enhancement of the vibration near the peak velocity of KVIV at S/D = 1.17, which is around five times larger as compared with the isolated counterpart. This may indicate occurrence of the wake-body-interference fluid elastic vibration. Penerbit Akademia Baru 2020 Article PeerReviewed application/pdf en http://eprints.utm.my/id/eprint/87896/1/SheikhAhmadZaki2020_ExperimentalInvestigationOfTheEffectOfADownstream.pdf Mohamed, A. and Zaki, S. A. and Shirakashi, M. and Ali, M. S. M. and Samsudin, M. Z. and Mohammad, A. F. (2020) Experimental investigation of the effect of a downstream square plate on vortex-induced vibration and galloping of a square cylinder. Journal of Advanced Research in Fluid Mechanics and Thermal Sciences, 68 (1). pp. 98-113. ISSN 2289-7879 http://www.dx.doi.org/10.37934/arfmts.68.1.98113 DOI: 10.37934/arfmts.68.1.98113
institution Universiti Teknologi Malaysia
building UTM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Malaysia
content_source UTM Institutional Repository
url_provider http://eprints.utm.my/
language English
topic T Technology (General)
spellingShingle T Technology (General)
Mohamed, A.
Zaki, S. A.
Shirakashi, M.
Ali, M. S. M.
Samsudin, M. Z.
Mohammad, A. F.
Experimental investigation of the effect of a downstream square plate on vortex-induced vibration and galloping of a square cylinder
description A square cylinder exposed to a fluid flow is regarded as the simplest model of the structures in sea water or air flow, and known to show the Karman vortex induced vibration (KVIV) and the galloping in separate or overlapping ranges of flow velocity. In this study, wind tunnel experiments were performed on the cross-flow vibration of a square cylinder, and effects of a downstream square plate on the vibration were investigated to develop a convenient passive technique for vibration control. The square plate has a side length w equal to the side length of the square cylinder D (= 26 mm) and set downstream with the gap ratio S/D in the range of 0.12 to 2.90 where S is the separation gap. The results show that the square plate has only little influence on KVIV and enhances the galloping, resulting in the lower critical reduced velocity of galloping Ug i.e. the onset velocity of galloping reduced to about half of the isolated counterpart at S/D = 0.98. Most remarkable effect of the downstream square plate is the enhancement of the vibration near the peak velocity of KVIV at S/D = 1.17, which is around five times larger as compared with the isolated counterpart. This may indicate occurrence of the wake-body-interference fluid elastic vibration.
format Article
author Mohamed, A.
Zaki, S. A.
Shirakashi, M.
Ali, M. S. M.
Samsudin, M. Z.
Mohammad, A. F.
author_facet Mohamed, A.
Zaki, S. A.
Shirakashi, M.
Ali, M. S. M.
Samsudin, M. Z.
Mohammad, A. F.
author_sort Mohamed, A.
title Experimental investigation of the effect of a downstream square plate on vortex-induced vibration and galloping of a square cylinder
title_short Experimental investigation of the effect of a downstream square plate on vortex-induced vibration and galloping of a square cylinder
title_full Experimental investigation of the effect of a downstream square plate on vortex-induced vibration and galloping of a square cylinder
title_fullStr Experimental investigation of the effect of a downstream square plate on vortex-induced vibration and galloping of a square cylinder
title_full_unstemmed Experimental investigation of the effect of a downstream square plate on vortex-induced vibration and galloping of a square cylinder
title_sort experimental investigation of the effect of a downstream square plate on vortex-induced vibration and galloping of a square cylinder
publisher Penerbit Akademia Baru
publishDate 2020
url http://eprints.utm.my/id/eprint/87896/1/SheikhAhmadZaki2020_ExperimentalInvestigationOfTheEffectOfADownstream.pdf
http://eprints.utm.my/id/eprint/87896/
http://www.dx.doi.org/10.37934/arfmts.68.1.98113
_version_ 1685579005748576256
score 13.211869

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