Experimental study on vortex-induced vibration of a flexible free-hanging pipe in uniform flow

Experimental study on vortex-induced vibration of a flexible free-hanging pipe in uniform flow

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Jing WANG^1a^,^1b^,^1c^,², Yu-wang XU^1a^,^1b^,^1c^,², Hao-jie REN^1a^,^1b^,^1c^,², Xue-peng FU^1a^,^1b^,^1c^,², Shi-xiao FU^1a^,^1b^,^1c^,², Meng-meng ZHANG^1a^,^1b^,^1c^,²

Journal of Ship Mechanics | 2024, 28(9) : 1405 - 1419

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Journal of Ship Mechanics | 2024, 28(9): 1405-1419

• Structural Mechanics •

Experimental study on vortex-induced vibration of a flexible free-hanging pipe in uniform flow

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Jing WANG^1a^,^1b^,^1c^,², Yu-wang XU^1a^,^1b^,^1c^,², Hao-jie REN^1a^,^1b^,^1c^,², Xue-peng FU^1a^,^1b^,^1c^,², Shi-xiao FU^1a^,^1b^,^1c^,², Meng-meng ZHANG^1a^,^1b^,^1c^,²

Affiliations

^1a.State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

^1b.School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

^1c.Institute of Polar and Ocean Technology, Institute of Marine Equipment, Shanghai Jiao Tong University, Shanghai 200240, China

^2.Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China

Published: 2024-09-20 doi: 10.3969/j.issn.1007-7294.2024.09.011

Outline

Abstract

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Ocean thermal energy conversion is one of the research hotspots of marine renewable energy in recent years. Free-hanging water intake pipes are the key structure to extract deep cold seawater. At present, the vortex-induced vibration (VIV) response characteristics of free-hanging pipes in deep sea currents are not clear yet. In this paper, model tests of a free-hanging pipe under uniform flow were carried out, and the strain response of vortex-induced vibration was measured by the fiber Bragg grating strain sensor. The amplitude and frequency characteristics of the free-hanging pipe were investigated by modal analysis and wavelet transform data processing methods. It is revealed that the maximum amplitude of the VIV displacement response of the free-hanging pipe under the uniform flow mainly occurs at the bottom. The dominant frequencies in inline (IL) direction is basically two times that in cross flow (CF) direction. However, in the conditions where the modal transition occurs, the dominant frequencies in IL and CF directions are the same, accompanied by obvious "traveling wave", "multi-frequency response" and "time-sharing" phenomenon. In addition, the Strouhal number of the overhanging pipe model in CF and IL under uniform sea currents are 0.15 and 0.30, which are slightly smaller than the results of flexible risers hinged at both ends. This value may serve as the parameter input for the vortex-induced vibration prediction of free-hanging pipes.

Key words

free-hanging pipe / flexible pipe / vortex-induced vibration / model test

Cite this Article

Jing WANG, Yu-wang XU, Hao-jie REN, Xue-peng FU, Shi-xiao FU, Meng-meng ZHANG. Experimental study on vortex-induced vibration of a flexible free-hanging pipe in uniform flow[J]. Journal of Ship Mechanics, 2024 , 28 (9) : 1405 -1419 . DOI: 10.3969/j.issn.1007-7294.2024.09.011

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Year 2024 volume 28 Issue 9

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Article Info

doi: 10.3969/j.issn.1007-7294.2024.09.011

Receive Date：2024-03-24
Online Date：2026-03-26
Published：2024-09-20

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History

Received：2024-03-24

Funding

Affiliations

^1a.State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

^1b.School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

^1c.Institute of Polar and Ocean Technology, Institute of Marine Equipment, Shanghai Jiao Tong University, Shanghai 200240, China

^2.Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China

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表12种不同金属材料的力学参数

科 Family	属数 Number of genus	种数 Number of species	占总种数比例 Percentage of total species (%)	属 Genus	种数 Number of species	占总种数比例 Percentage of total species (%)
鹅膏菌科Amanitaceae	2	11	5.26	鹅膏菌属 Amanita	10	4.78
小菇科 Mycenaceae	2	12	5.74	丝盖伞属 Inocybe	5	2.39
多孔菌科 Polyporaceae	8	14	6.70	蜡蘑属 Laccaria	5	2.39
红菇科 Russulaceae	3	23	11.00	小皮伞属 Marasmius	6	2.87
				小菇属 Mycena	11	5.26
				光柄菇属 Pluteus	5	2.39
				红菇属 Russula	17	8.13
				栓菌属 Trametes	5	2.39

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