Experimental investigation on hydrodynamic forces of semi-submerged cylinders in combined steady and oscillatory flow

Experimental investigation on hydrodynamic forces of semi-submerged cylinders in combined steady and oscillatory flow

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Teng-yan HU^a^,^b, Hao-jie REN^a^,^b, Jia-wei SHEN^a^,^b, Zhi-bo NIU^a^,^b, Meng-meng ZHANG^a^,^b, Yu-wang XU^a^,^b, Bin SONG^a^,^b

Journal of Ship Mechanics | 2024, 28(11) : 1643 - 1653

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Journal of Ship Mechanics | 2024, 28(11): 1643-1653

• Hydrodynamics •

Experimental investigation on hydrodynamic forces of semi-submerged cylinders in combined steady and oscillatory flow

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Teng-yan HU^a^,^b, Hao-jie REN^a^,^b, Jia-wei SHEN^a^,^b, Zhi-bo NIU^a^,^b, Meng-meng ZHANG^a^,^b, Yu-wang XU^a^,^b, Bin SONG^a^,^b

Affiliations

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

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

Published: 2024-11-20 doi: 10.3969/j.issn.1007-7294.2024.11.002

Outline

Abstract

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The floating cylindrical structures, such as the floating frame of the fish farming and the floating bodies of wave energy convertor and so on, are generally semi-submerged. However, the investigation on the hydrodynamics on such floating cylinders are few. This status makes the design and analysis of the relevant new structures face the essential problems of the force input uncertainty. The hydrodynamic forces on a semi-submerged cylinder were experimentally investigated under the combined influence of steady and oscillatory flow. To simulate the equivalent combined flow, the cylinder towed by the carriage was forced to oscillate with different amplitudes and periods. A significant mean downward lift force was observed for the semi-submerged cylinders, which was obviously larger than that of the mean drag force. Moreover, the relationship between the hydrodynamic coefficients and multi-sensitive parameters was revealed. It is confirmed that the KC number has a weak influence on the coefficients. The Froude number is seen to be the most important parameter affecting the hydrodynamic coefficients. The empirical models for predicting hydrodynamic coefficients in combined flow are initially developed. This work can provide useful references for the design of the related marine structures and serve as the valuable guideline for future research.

Key words

semi-submerged cylinder / combined flow / hydrodynamic coefficient / overtopping / model experiment

Cite this Article

Teng-yan HU, Hao-jie REN, Jia-wei SHEN, Zhi-bo NIU, Meng-meng ZHANG, Yu-wang XU, Bin SONG. Experimental investigation on hydrodynamic forces of semi-submerged cylinders in combined steady and oscillatory flow[J]. Journal of Ship Mechanics, 2024 , 28 (11) : 1643 -1653 . DOI: 10.3969/j.issn.1007-7294.2024.11.002

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Year 2024 volume 28 Issue 11

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Article Info

doi: 10.3969/j.issn.1007-7294.2024.11.002

Receive Date：2024-05-20
Online Date：2026-03-26
Published：2024-11-20

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History

Received：2024-05-20

Funding

Affiliations

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

^b.Institute of Polar and Ocean Technology, Institute of Marine Equipment, Shanghai Jiao Tong University, 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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