The mechanism of aerodynamic noise reduction from tandem cylinders in the co-shedding flow regime due to phase shift
The mechanism of aerodynamic noise reduction from tandem cylinders in the co-shedding flow regime due to phase shift
When tandem cylinders are arranged with a certain gap spacing, the aerodynamic noise can be enhanced or suppressed. The mechanism behind this effect remains unclear, especially the role of the phase shift in the flow. This paper investigates the characteristics of the aerodynamic noise generated from tandem cylinders at three spacings in the co-shedding flow regime. Experimental results show that, compared with a single cylinder case, the noise is increased by around 5 dB at a spacing ratio of L/D = 4 and by 1.5 dB at L/D = 6, while it is decreased by about 2 dB at L/D = 5. Although the key flow features of the three tandem-cylinder cases are quite similar, a near in-phase vortex shedding is formed by the upstream and downstream cylinders at L/D = 4, while the vortex shedding in the wake of the two cylinders is close to anti-phase at L/D = 5. At L/D = 6, the vortex shedding of the two cylinders has a phase difference around 120º. Consequently, the far-field aerodynamic noise produced from the tandem cylinders is the highest at L/D = 4 and the lowest at L/D = 5. This demonstrates that the out-of-phase vortex shedding formed by the two cylinders in tandem arrangement at L/D = 5 may strengthen the anti-phase correlation between them and reduce effectively the aerodynamic noise generated.
Zhu, J.Y.
69ffa090-b725-453b-967b-01daafab922c
Yang, H.
40cdba62-bb2e-4404-8cb3-bd29f5f8c9d8
Yuan, Y.Y.
e10b4b8c-95b2-4089-a80b-46323952d7ac
Hu, Z.W.
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
Zhang, X.Y.
cddc4865-9c11-4bcd-b648-d4b6290f7830
Thompson, D.J.
bca37fd3-d692-4779-b663-5916b01edae5
29 November 2025
Zhu, J.Y.
69ffa090-b725-453b-967b-01daafab922c
Yang, H.
40cdba62-bb2e-4404-8cb3-bd29f5f8c9d8
Yuan, Y.Y.
e10b4b8c-95b2-4089-a80b-46323952d7ac
Hu, Z.W.
dd985844-1e6b-44ba-9e1d-fa57c6c88d65
Zhang, X.Y.
cddc4865-9c11-4bcd-b648-d4b6290f7830
Thompson, D.J.
bca37fd3-d692-4779-b663-5916b01edae5
Zhu, J.Y., Yang, H., Yuan, Y.Y., Hu, Z.W., Zhang, X.Y. and Thompson, D.J.
(2025)
The mechanism of aerodynamic noise reduction from tandem cylinders in the co-shedding flow regime due to phase shift.
Journal of Sound and Vibration, 624, [119564].
(doi:10.1016/j.jsv.2025.119564).
Abstract
When tandem cylinders are arranged with a certain gap spacing, the aerodynamic noise can be enhanced or suppressed. The mechanism behind this effect remains unclear, especially the role of the phase shift in the flow. This paper investigates the characteristics of the aerodynamic noise generated from tandem cylinders at three spacings in the co-shedding flow regime. Experimental results show that, compared with a single cylinder case, the noise is increased by around 5 dB at a spacing ratio of L/D = 4 and by 1.5 dB at L/D = 6, while it is decreased by about 2 dB at L/D = 5. Although the key flow features of the three tandem-cylinder cases are quite similar, a near in-phase vortex shedding is formed by the upstream and downstream cylinders at L/D = 4, while the vortex shedding in the wake of the two cylinders is close to anti-phase at L/D = 5. At L/D = 6, the vortex shedding of the two cylinders has a phase difference around 120º. Consequently, the far-field aerodynamic noise produced from the tandem cylinders is the highest at L/D = 4 and the lowest at L/D = 5. This demonstrates that the out-of-phase vortex shedding formed by the two cylinders in tandem arrangement at L/D = 5 may strengthen the anti-phase correlation between them and reduce effectively the aerodynamic noise generated.
Text
Noise reduction effect of tandem cylinders_JSV
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Accepted/In Press date: 21 November 2025
e-pub ahead of print date: 22 November 2025
Published date: 29 November 2025
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Local EPrints ID: 507956
URI: http://eprints.soton.ac.uk/id/eprint/507956
ISSN: 0022-460X
PURE UUID: 8a854f47-0150-4d94-9ea6-63bb6ad78a2e
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Date deposited: 08 Jan 2026 17:40
Last modified: 09 Jan 2026 02:36
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Author:
J.Y. Zhu
Author:
H. Yang
Author:
Y.Y. Yuan
Author:
X.Y. Zhang
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