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Numerical investigation of the effects of edge constraints on the wave-induced hydroelastic responses of the single large floating module

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OCEAN ENGINEERING 2025年 326卷

作者： Jia, Ao Wang, Xinyu Li, Aijun Liu, Yong Jiang, Shengchao Ocean Univ China Shandong Prov Key Lab Ocean Engn Qingdao 266100 Peoples R China Dalian Univ Technol State Key Lab Coastal & Offshore Engn Dalian 116024 Peoples R China

This study investigates the hydroelastic performance of the single large floating module (LFM) under six edge constraint configurations representing simplified mooring systems. These edge constraints include fixed, hinged, vertical pile guide, catenary mooring, taut mooring and unconstrained edge conditions. A two-way coupled fluid- structure interaction (FSI) model is introduced and validated against the literature results of the mooring force and structural heave displacement. The validated model is then adopted to analyze the effects of edge constraints, Young's modulus and wave periods on the heave displacement and bending moment of the single LFM. The decomposition of heave displacement based on normal modes indicates that the structural bending modes transition from higher to lower order modes as Young's modulus and incident wave period increase, which is attributed to the increase of local wavelength beneath the LFM measured by the width of the dynamic pressure zone. Choosing the right edge constraints is essential for maintaining equilibrium between heave displacement and bending moment. Fixed constraints reduce displacement but cause higher bending moments. Hinged, vertical pile guide and taut mooring constraints effectively limit the heave displacement while preventing excessive bending moment responses, compared to the unconstrained, fixed and catenary mooring edge constraints.

关键词： Large floating module Edge constraints hydroelastic response

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Assessment of regular and earthquake-induced wave hydrodynamic tests of moored and end-fixed submerged floating tunnels

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JOURNAL OF FLUIDS AND STRUCTURES 2025年 135卷

作者： Liu, Zhongxiang Shi, Xueji Guo, Tong Ren, Hongyu Yu, Jun Southeast Univ Sch Transportat Nanjing 210096 Peoples R China Southeast Univ Key Lab Concrete & Prestressed Concrete Struct Minist Educ Nanjing 210096 Peoples R China Southeast Univ Adv Ocean Inst Nantong 226000 Peoples R China China Ship Sci Res Ctr Wuxi 214028 Peoples R China

Submerged floating tunnel (SFT) is a new type of fully immersed sea-crossing structure for future traffic design, which has a high application prospect in complex bay environment. During the service lifespan, SFTs have the risk of wave impact. Therefore, to ensure safety and stability of the SFTs, hydrodynamic tests of a 1:60 scaled model were carried out in a large pool with underwater vibration table, where data on acceleration, roll, pitch rotation, yaw rotation, displacement, variation table and cable tension were collected. Comprehensive investigation was conducted to explore the excitation effects and hydroelastic responses of the model under regular and earthquake-induced waves with different immersion depths along with the modal characteristic analysis. The results show that the natural frequency of the SFT is significantly influenced by the angle of the cables. As the angle increases, the vertical stiffness of the system also increases, which consequently raises the natural frequency of the structure. According to hydrodynamic analysis, shallower the depth of the SFT, the more it hinders the propagation of waves, resulting in subsequent wave attenuation but aggravating structural responses. Furthermore, under regular and earthquake-induced waves, harmonic resonance can be triggered. The acceleration, roll angle, and cable tension undergo the most significant changes at the mid-span section. The increase in cable tension on the upstream side exceeds the decrease in tension under higher frequency wave due to wave impact force. There are discrepancies in angle responses among the cross-sections and the mid-span section demonstrates larger roll angles and smaller pitch and yaw angles, leading to phase angle deviations among the three variations. For earthquake-induced waves, more pronounced structural responses result from greater seismic acceleration amplitude and shallower immersion depth. And the response relationship between sway and heave, as well as the p

关键词： Submerged floating tunnel Scale experiment hydroelastic response Regular wave Earthquake-induced wave

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hydroelastic responses and interactions of floating fuel storage modules placed side-by-side with floating breakwaters

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MARINE STRUCTURES 2009年第3期22卷 633-658页

作者： Tay, Z. Y. Wang, C. M. Utsunomiya, T. Natl Univ Singapore Dept Civil Engn Singapore 119260 Singapore Kyoto Univ Dept Civil & Earth Resources Engn Kyoto Japan

This paper is concerned with the hydroelastic responses and hydrodynamic interactions of two large floating fuel storage modules placed side-by-side with the presence of floating breakwaters. These modules and breakwaters form the floating fuel storage facility (FFSF). The floating storage modules and breakwaters are modeled as plates and the linear wave theory is used to model the water waves in the numerical model. The numerical model is verified with existing numerical results and validated with experimental test. Numerical simulations are performed to determine the hydroelastic behavior and hydrodynamic interactions of floating storage modules placed adjacent to each other and enclosed by floating breakwaters under various incident wave angles. The effects of breakwaters, drafts, channel spacing formed by the two adjacent modules and water depth on the hydroelastic responses of the modules are investigated. The wave induced responses of multiple floating storage modules enclosed by floating breakwaters are also examined. (C) 2008 Elsevier Ltd. All rights reserved.

关键词： hydroelastic response Hydrodynamic interactions Very large floating structures (VLFS) Floating fuel storage facility (FFSF) Floating breakwater

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Numerical and experimental investigation on hydroelastic responses of an 8-module VLFS near a typical island

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OCEAN ENGINEERING 2020年 214卷

作者： Ding, Jun Xie, Zhuoyu Wu, Yousheng Xu, Shengwen Qiu, Gengyao Wang, Yitao Wang, Qibin China Ship Sci Res Ctr Wuxi 214082 Jiangsu Peoples R China Shanghai Jiao Tong Univ Natl Lab Naval Architecture & Ocean Engn Shanghai 200240 Peoples R China

The very large floating structure (VLFS) deployed near seashore, islands and reefs are always exposed to the extremely complex encountering waves. Traditional methods with homogeneous wave inputs are not applicable for the hydroelastic analysis of this type VLFS. In this paper, the authors carry out a numerical and experimental investigation on hydroelastic responses of an 8-module VLFS near a typical island. A direct coupling analysis method is established on the basis of the Boussinesq equation and RANKINE source method. The detailed theoretical derivation, numerical method and relevant calculation program THAFTS-BR are presented. Wave propagation near the island, motions and connector loads of the VLFS deployed a typical island are investigated based on the numerical method and model tests. Several useful conclusions are obtained, which can provide a reference for the analysis of dynamic responses, design and construction of the floating structures near islands and seashores.

关键词： 8-Module VLFS hydroelastic response Complicated wave condition Direct coupling analysis method Experiment

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Overview: Research on hydroelastic responses of VLFS in complex environments

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MARINE STRUCTURES 2021年 78卷

作者： Ding, Jun Wu, Yousheng Xie, Zhuoyu Yang, Weinan Wang, Siyu Yu, Jun Yu, Tao China Ship Sci Res Ctr Wuxi 214082 Jiangsu Peoples R China

In the past several decades, extensive investigations have been carried out on the hydroelastic responses of Very Large Floating Structures (VLFS) in the deep open sea by researchers around the world. However, when tackling the hydroelastic problems of VLFS used as the protection and exploitation of marine resources near offshore and islands, the effects of complex environments, such as the seabed profile and inhomogeneous wave conditions should be taken into account. Based on the development history of VLFS and the process of classical hydroelasticity of VLFS, the research results of hydroelastic responses of VLFS in complex environments have been systematically summarized in this paper, so as to provide a basis for the further research.

关键词： Very large floating structure hydroelastic response Complex environment Coupled method

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Mitigation of hydroelastic responses in a Very Large Floating Structure by a Connected Vertical Porous Flexible Barrier

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WATER 2022年第3期14卷

作者： Pu, Jun Lu, Dong-Qiang Shanghai Univ Shanghai Inst Appl Math & Mech Sch Mech & Engn Sci Yanchang Rd Shanghai 200072 Peoples R China Shanghai Key Lab Mech Energy Engn Yanchang Rd Shanghai 200072 Peoples R China

The hydroelastic response of an elastic thin plate combined with a vertical porous flexible plate floating on a single- or a two-layer fluid is analyzed in the two-dimensional Cartesian coordinate system. The vertical and the horizontal plates are placed in an inverted-L shape and rigidly connected together. The problem is studied with the aid of the method of matched eigenfunction expansions within the framework of linear potential flow theory. The fluid is assumed to be inviscid and incompressible, and the motion is assumed to be irrotational. Time-harmonic incident waves of the traveling mode with a given angular frequency are considered. Then, the least-squares approximation method and the inner product are used to obtain the expansion coefficients of the velocity potentials. Graphical results show the interaction between the water waves and the structure. The effects of several physical parameters, including the length and the complex porous-effect parameter of the vertical plate, on the wave reflection and transmission are discussed. The results show that a vertical plate can effectively eliminate the hydroelastic response of the very large floating structure. The longer a vertical plate is, the more waves are reflected by the vertical plate. With the increase in the porous-effect parameter, the deflection of vertical plate decreases. Besides the effects of the flexural rigidity, the lateral stress, the mooring line angle, the fluid density ratio, and the position of interface on the wave reflection and transmission are discussed. Numerical results show the significant mitigation effect due to the presence of the additional vertical plate.

关键词： the methods of matched eigenfunction expansions hydroelastic response vertical porous flexible very large floating structure

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Research on hydroelastic responses of VLFS: Recent progress and future work

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INTERNATIONAL JOURNAL OF OFFSHORE AND POLAR ENGINEERING 2000年第2期10卷 81-90页

作者： Kashiwagi, M Kyushu Univ Res Inst Appl Mech Fukuoka Japan

This paper presents a review of recent studies on the prediction of hydroelastic responses of a very large floating structure (VLFS). It is divided into the pontoon type and column-supported type structures. Studies on the pontoon type are divided further into the frequency-domain and time-domain analyses. A new calculation method for general time-dependent problems is also described, which is one of the-future works required. The hierarchical interaction theory, developed recently by the author for analyzing hydrodynamic interactions among a large number of columns, is explained with some equations and numerical results. However, experimental work is not reviewed in detail, because this paper focuses on analytical calculation methods.

关键词： very large floating structure pontoon type column-supported type hydroelastic response mode-expansion method direct method state of the art

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Prediction on hydroelastic responses of very large floating structure with the eigenfunction expansion-matching method

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INTERNATIONAL JOURNAL OF COMPUTER APPLICATIONS IN TECHNOLOGY 2020年第4期62卷 338-347页

作者： Wan Zhinan Zhai Gangjun Cheng Yong CCCC FHDI Engn Co Ltd Guangzhou 510230 Peoples R China Dalian Univ Technol Deep Sea Engn Res Ctr Dept Construct Engn Dalian 116024 Peoples R China Jiangsu Univ Sci & Technol Sch Naval Architecture & Ocean Engn Zhenjiang 212003 Jiangsu Peoples R China

This paper investigates the hydroelastic responses of a mat-like, rectangular very large floating structure (VLFS) with analytical method. The VLFS is considered as a two-dimensional thick plate and the wave linearity theory is employed. The flow field is divided into three regions and the eigenfunction expansion-matching method is applied in determining the velocity potential of each region, and then the Rayleigh-Ritz method is used to solve the elastic equation of motion. The analytical method is verified by comparing with the published numerical and experimental results. The elastic deformation and wave exciting force of the VLFS are computed and the effects of water depth, wavelength, draft and stiffness on the elastic deformation of the VLFS are further discussed. The deformation increases with the increase of wavelength in general, decreases with the increase of stiffness, increases slightly with the increase of draught, and does not change significantly with the depth of water.

关键词： very large floating structure eigenfunction expansion-matching method Rayleigh-Ritz method hydroelastic response

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Numerical analysis of added mass and damping of elastic hydrofoils

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Journal of Hydrodynamics 2020年第5期32卷 1009-1023页

作者： Jia-sheng Li Ye-gao Qu Hong-xing Hua School of Naval Architecture and Ocean Engineering Huazhong University of Science and TechnologyWuhan 430074China Hubei Provincial Engineering Research Center of Data Techniques and Supporting Software for Ships(DTSSS) Wuhan 430074China State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong UniversityShanghai 200240China

A numerical model is proposed for analyzing the effects of added mass and damping on the dynamic behaviors of *** coupled fluid-structure interactions(FSIs)of hydrofoils are analyzed by using the 3-D panel method for the fluid and the finite element method for the *** added mass and damping matrices due to the external fluid of the hydrofoil are asymmetric and computational *** computational inefficiencies associated with these asymmetric matrices are overcome by using a modal reduction technique,in which the first several wet mode vectors of the hydrofoil are employed in the analysis of the FSI *** discretized system of equations of motion for the hydrofoil are solved using the Wilson-6 *** present methods are validated by comparing the computed results with those obtained from the finite element *** is found that the stationary flow is sufficient for determining the wet modes of the hydrofoil under the condition of single-phase potential flow and without phase *** the case of relatively large inflow velocity,the added damping of the fluid can significantly affect the structural responses of the hydrofoil.

关键词： Fluid-structure interaction(FSI) hydroelastic response hydrofoil added mass added damping

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Oblique Wave-Induced responses of A VLFS Edged with A Pair of Inclined Perforated Plates

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China Ocean Engineering 2018年第1期32卷 14-25页

作者： CHENG Yong JI Chun-yan ZHAI Gang-jun Gaidai Oleg School of Naval Architecture and Ocean Engineering Jiangsu University of Science and Technology Deepwater Engineering Research Center Dalian University of Technology Centre for Ships and Ocean Structures Norwegian University of Science and Technology

This paper is concerned with the hydroelastic responses of a mat-like, rectangular very large floating structure(VLFS) edged with a pair of horizontal/inclined perforated anti-motion plates in the context of the direct coupling method. The updated Lagrangian formulae are applied to establish the equilibrium equations of the VLFS and the total potential formula is employed for fluids in the numerical model including the viscous effect of the perforated plates through the Darcy’s law. The hybrid finite element-boundary element(FE-BE) method is implemented to determine the response reduction of VLFS with attached perforated plates under various oblique incident ***, the numerical solutions are validated against a series of experimental tests. The effectiveness of the attached perforated plates in reducing the deflections of the VLFS can be significantly improved by selecting the proper design parameters such as the porous parameter, submergence depth, plate width and inclination angle for the given sea conditions.

关键词： very large floating structure(VLFS) anti-motion device hydroelastic response numerical analysis experiment

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