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Experimental investigation on coupled cross-flow and in-line vortex-induced vibration responses of two staggered circular cylinders

Experimental investigation on coupled cross-flow and in-line vortex-induced vibration responses of two staggered circular cylinders
Experimental investigation on coupled cross-flow and in-line vortex-induced vibration responses of two staggered circular cylinders
In order to better understand the vortex-induced vibration (VIV) mechanism of multiple cylinders, this paper takes a relatively simple case of two staggered circular cylinders as the embarkation point, and investigates their VIV characteristics by model test. The experimental Reynolds number ranges from 22000 to 88000. The in-line gap L is set as 3.0D, 3.6D, 4.2D and 5.5D in turn, and the cross-flow gap T is set as 0.7D, 1.1D, 1.5D, 1.9D, 2.3D and 2.7D respectively. By measuring the vibrating response in model test, the response differences between the two staggered cylinders and the isolated cylinder and the effects of the gaps are discussed. The results indicate that the variation trend of response of the upstream cylinder with reduced velocity is basically similar with that of the isolated cylinder. However, the downstream cylinder shows some great differences. When the in-line gap ratio L/D is 3.6, the cross-flow amplitude curve of downstream cylinder changes from “single peak” to “double peaks” with the increase of cross-flow gap ratio T/D, and in-line amplitude curve even shows four different kinds of forms. When L/D is increasing, maximum amplitudes of the downstream cylinder in two directions also show an increasing trend, and the wake galloping phenomenon even appears in some conditions. Generally, the case of staggered cylinders is a generalized combination of two circular cylinders in tandem and side-by-side arrangements, and this paper has extended the research scope of the double-cylinder VIV to arbitrary flow direction.
staggered circular cylinders; vortex-induced vibration; model test; in-line and cross-flow gaps; amplitude response
1475-0902
1-13
Zhang, Cheng
91b90b4c-2df8-47f9-957f-50f267493539
Kang, Zhuang
48258e9f-87b5-4fbe-ab06-3ab7edc63538
Xiong, Yeping
51be8714-186e-4d2f-8e03-f44c428a4a49
Ai, Shangmao
9fbeb6fa-135a-4f65-8247-488f22e3c909
Ma, Gang
e1fadc67-6db8-4dfc-9ff3-3e246f081faf
Zhang, Cheng
91b90b4c-2df8-47f9-957f-50f267493539
Kang, Zhuang
48258e9f-87b5-4fbe-ab06-3ab7edc63538
Xiong, Yeping
51be8714-186e-4d2f-8e03-f44c428a4a49
Ai, Shangmao
9fbeb6fa-135a-4f65-8247-488f22e3c909
Ma, Gang
e1fadc67-6db8-4dfc-9ff3-3e246f081faf

Zhang, Cheng, Kang, Zhuang, Xiong, Yeping, Ai, Shangmao and Ma, Gang (2020) Experimental investigation on coupled cross-flow and in-line vortex-induced vibration responses of two staggered circular cylinders. Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment, 1-13. (doi:10.1177/1475090220907473).

Record type: Article

Abstract

In order to better understand the vortex-induced vibration (VIV) mechanism of multiple cylinders, this paper takes a relatively simple case of two staggered circular cylinders as the embarkation point, and investigates their VIV characteristics by model test. The experimental Reynolds number ranges from 22000 to 88000. The in-line gap L is set as 3.0D, 3.6D, 4.2D and 5.5D in turn, and the cross-flow gap T is set as 0.7D, 1.1D, 1.5D, 1.9D, 2.3D and 2.7D respectively. By measuring the vibrating response in model test, the response differences between the two staggered cylinders and the isolated cylinder and the effects of the gaps are discussed. The results indicate that the variation trend of response of the upstream cylinder with reduced velocity is basically similar with that of the isolated cylinder. However, the downstream cylinder shows some great differences. When the in-line gap ratio L/D is 3.6, the cross-flow amplitude curve of downstream cylinder changes from “single peak” to “double peaks” with the increase of cross-flow gap ratio T/D, and in-line amplitude curve even shows four different kinds of forms. When L/D is increasing, maximum amplitudes of the downstream cylinder in two directions also show an increasing trend, and the wake galloping phenomenon even appears in some conditions. Generally, the case of staggered cylinders is a generalized combination of two circular cylinders in tandem and side-by-side arrangements, and this paper has extended the research scope of the double-cylinder VIV to arbitrary flow direction.

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Accepted/In Press date: 21 January 2020
e-pub ahead of print date: 7 March 2020
Keywords: staggered circular cylinders; vortex-induced vibration; model test; in-line and cross-flow gaps; amplitude response

Identifiers

Local EPrints ID: 438463
URI: http://eprints.soton.ac.uk/id/eprint/438463
ISSN: 1475-0902
PURE UUID: 8393ea68-635f-4d3d-9ed5-9f53535a5084
ORCID for Yeping Xiong: ORCID iD orcid.org/0000-0002-0135-8464

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Date deposited: 10 Mar 2020 17:33
Last modified: 07 Oct 2020 01:45

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