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Hydrodynamic performance of a floating fluid-filled membrane breakwater: experimental and numerical study

Published online by Cambridge University Press:  11 December 2024

Chaofan Lv Open the ORCID record for Chaofan Lv [Opens in a new window] ,
Xizeng Zhao Open the ORCID record for Xizeng Zhao [Opens in a new window] ,
Kaiyuan Zheng ,
Yiyang Zong ,
Siming Zheng Open the ORCID record for Siming Zheng [Opens in a new window] ,
Hongyi Jiang Open the ORCID record for Hongyi Jiang [Opens in a new window] ,
Shiming Yao  and
Hualong Luan
Chaofan Lv
Affiliation:
Changjiang River Scientific Research Institute, Wuhan 430010, Hubei, PR China Ocean College, Zhejiang University, Zhoushan 316021, Zhejiang, PR China Key Laboratory of River and Lake Regulation and Flood Control in the Middle and Lower Reaches of the Changjiang River of Ministry of Water Resources, Wuhan 430010, Hubei, PR China
Xizeng Zhao*
Affiliation:
Ocean College, Zhejiang University, Zhoushan 316021, Zhejiang, PR China Ocean Research Centre of Zhoushan, Zhejiang University, Zhoushan 316021, Zhejiang, PR China
Kaiyuan Zheng
Affiliation:
Ocean College, Zhejiang University, Zhoushan 316021, Zhejiang, PR China
Yiyang Zong
Affiliation:
Shanghai Investigation, Design and Research Institute, Shanghai 200335, PR China
Siming Zheng
Affiliation:
Ocean College, Zhejiang University, Zhoushan 316021, Zhejiang, PR China School of Engineering, Computing and Mathematics, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK
Hongyi Jiang
Affiliation:
Ocean College, Zhejiang University, Zhoushan 316021, Zhejiang, PR China
Shiming Yao
Affiliation:
Changjiang River Scientific Research Institute, Wuhan 430010, Hubei, PR China Key Laboratory of River and Lake Regulation and Flood Control in the Middle and Lower Reaches of the Changjiang River of Ministry of Water Resources, Wuhan 430010, Hubei, PR China
Hualong Luan
Affiliation:
Changjiang River Scientific Research Institute, Wuhan 430010, Hubei, PR China Key Laboratory of River and Lake Regulation and Flood Control in the Middle and Lower Reaches of the Changjiang River of Ministry of Water Resources, Wuhan 430010, Hubei, PR China
*
†Email address for correspondence: [email protected]
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Abstract

Floating fluid-filled membrane breakwater (FFMB) is a temporary structure that can attenuate waves in the deep sea. In this paper the hydrodynamic performance of the FFMB is analysed by using the eigenfunction expansion boundary element method (EEBEM) and physical model experiments. A general motion equation is derived that considers both the dynamic tension and curvature of the membrane. Moreover, an integral expression for the dynamic tension is provided. On this basis, a linear model for solving wave–membrane interaction is established through the EEBEM. Newly designed physical experiments are performed to verify the model and elucidate the nonlinear characteristics of the FFMB. Following verification of the model, this paper investigates the effects of various structural parameters of the FFMB on the wave transmission coefficient, reflection coefficient, horizontal wave force, vertical wave force and dynamic tension. Furthermore, the interrelationship between the structural resonant response and the hydrodynamic performance is elucidated, and the optimal density and filling ratio of the FFMB for engineering applications are proposed. The results demonstrate that the numerical and experimental results are in good agreement, indicating that the model and the motion equation are both practical and highly accurate. By optimizing the structural parameters, the FFMB is capable of effectively attenuating waves within a specific frequency band, while minimizing the wave force.

JFM classification

Waves/Free-surface Flows: Wave-structure interactions Waves/Free-surface Flows: Surface gravity waves Waves/Free-surface Flows: Wave scattering
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 1001 , 25 December 2024 , A21
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Copyright
© The Author(s), 2024. Published by Cambridge University Press

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