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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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 |
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Engineering Cylinder wake Morphing Zeng, Lingwei New, Tze How Tang, Hui Control of cylinder wake using oscillatory morphing surface |
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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. |
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School of Mechanical and Aerospace Engineering |
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School of Mechanical and Aerospace Engineering Zeng, Lingwei New, Tze How Tang, Hui |
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Article |
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Zeng, Lingwei New, Tze How Tang, Hui |
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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 |
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Control of cylinder wake using oscillatory morphing surface |
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Control of cylinder wake using oscillatory morphing surface |
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control of cylinder wake using oscillatory morphing surface |
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2024 |
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https://hdl.handle.net/10356/178913 |
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