Control of cylinder wake using oscillatory morphing surface

In this study, the wake of a cylinder was actively controlled by the cylinder's oscillatory morphing surface. Experiments were conducted in a closed-loop water channel. A cylinder of diameter 36 mm was placed in 0.09 m/s water flow, resulting in the Reynolds number 3240 and the vortex shedding...

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Main Authors: Zeng, Lingwei, New, Tze How, Tang, Hui
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2024
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Online Access:https://hdl.handle.net/10356/178913
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1789132024-07-13T16:48:10Z Control of cylinder wake using oscillatory morphing surface Zeng, Lingwei New, Tze How Tang, Hui School of Mechanical and Aerospace Engineering Engineering Cylinder wake Morphing In this study, the wake of a cylinder was actively controlled by the cylinder's oscillatory morphing surface. Experiments were conducted in a closed-loop water channel. A cylinder of diameter 36 mm was placed in 0.09 m/s water flow, resulting in the Reynolds number 3240 and the vortex shedding frequency around 0.5 Hz. The cylinder's morphing surface oscillated at four different frequencies, i.e., 0.5, 1, 2, and 4 Hz. It was found that, compared to the rigid circular cylinder, the cylinder with oscillatory morphing surface can generally produce a smaller vortex formation length, especially at intermediate oscillation frequencies. The shear layers developed from the cylinder transit and roll up earlier due to enhanced flow instabilities. With the highest-frequency oscillations, the shear layer develops into a train of many small vortices that follow the trace of undisturbed shear layer. This study reveals some physical insights into this novel flow control method, which could be useful in future engineering applications. Nanyang Technological University Published version This study was financially supported by the Research Grants Council of Hong Kong under General Research Fund (Project No. 15218421); L.Z. would like to acknowledge the financial support provided by The Hong Kong Polytechnic University through Research Student Attachment Program. T.H.N. acknowledges the support from the School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore. 2024-07-10T05:09:08Z 2024-07-10T05:09:08Z 2024 Journal Article Zeng, L., New, T. H. & Tang, H. (2024). Control of cylinder wake using oscillatory morphing surface. Physics of Fluids, 36(5), 057144-. https://dx.doi.org/10.1063/5.0208868 1070-6631 https://hdl.handle.net/10356/178913 10.1063/5.0208868 2-s2.0-85194154035 5 36 057144 en Physics of Fluids © 2024 Author(s). Published under an exclusive license by AIP Publishing. This article may be downloaded for personal use only. Any other use requires prior permission of the copyright holder. The Version of Record is available online at http://doi.org/10.1063/5.0208868 application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering
Cylinder wake
Morphing
spellingShingle Engineering
Cylinder wake
Morphing
Zeng, Lingwei
New, Tze How
Tang, Hui
Control of cylinder wake using oscillatory morphing surface
description In this study, the wake of a cylinder was actively controlled by the cylinder's oscillatory morphing surface. Experiments were conducted in a closed-loop water channel. A cylinder of diameter 36 mm was placed in 0.09 m/s water flow, resulting in the Reynolds number 3240 and the vortex shedding frequency around 0.5 Hz. The cylinder's morphing surface oscillated at four different frequencies, i.e., 0.5, 1, 2, and 4 Hz. It was found that, compared to the rigid circular cylinder, the cylinder with oscillatory morphing surface can generally produce a smaller vortex formation length, especially at intermediate oscillation frequencies. The shear layers developed from the cylinder transit and roll up earlier due to enhanced flow instabilities. With the highest-frequency oscillations, the shear layer develops into a train of many small vortices that follow the trace of undisturbed shear layer. This study reveals some physical insights into this novel flow control method, which could be useful in future engineering applications.
author2 School of Mechanical and Aerospace Engineering
author_facet School of Mechanical and Aerospace Engineering
Zeng, Lingwei
New, Tze How
Tang, Hui
format Article
author Zeng, Lingwei
New, Tze How
Tang, Hui
author_sort Zeng, Lingwei
title Control of cylinder wake using oscillatory morphing surface
title_short Control of cylinder wake using oscillatory morphing surface
title_full Control of cylinder wake using oscillatory morphing surface
title_fullStr Control of cylinder wake using oscillatory morphing surface
title_full_unstemmed Control of cylinder wake using oscillatory morphing surface
title_sort control of cylinder wake using oscillatory morphing surface
publishDate 2024
url https://hdl.handle.net/10356/178913
_version_ 1814047200755318784