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Influences of bragg reflection on harbor resonance triggered by irregular wave groups Ocean Eng. (IF 5.0) Pub Date : 2024-04-24 Junliang Gao, Linhui Hou, Yingyi Liu, Huabin Shi
Gao et al. (2021b) attempted for the first time to use Bragg reflection to mitigate the harbor resonance induced by regular long waves and bi-chromatic short wave groups, revealing its remarkable effectiveness. However, in actual coastal/offshore areas, waves usually exist in the form of irregular wave groups. This article considers the more practical irregular wave groups as the incident waves that
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Optimization of energy efficiency for offshore wind farms via wake modeling-free NMPC Ocean Eng. (IF 5.0) Pub Date : 2024-04-24 Qi Yao, Yangming Zhang, Shanxun Sun, Yang Hu, Jizhen Liu, Fang Fang
This paper presents an energy efficiency improvement scheme for offshore wind farms. This scheme uses learning-based nonlinear model predictive control (NMPC) and does not require wake modeling. The main feature is that each wind turbine can independently complete all optimal control, without the need for wind farm wake model calculation and iterative optimization. Specifically, this paper studies
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Wave attenuation by three-dimensional circular floating sea ice: Regular and irregular waves Ocean Eng. (IF 5.0) Pub Date : 2024-04-24 Xiang Wang, Ce Zhang, Liyu Ye, Chao Wang, Fajun Yu
The evolution of ice conditions and wave patterns in polar water areas is complex, and studying the hydrodynamic response between sea ice and waves is crucial. In this study, the hydrodynamic response of sea ice in infinitely deep water is investigated by a sea ice scattering model based on linear potential flow and thin plate approximation theory. Building upon regular wave and sea ice scattering
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Transient gap resonance between two closely-spaced boxes triggered by nonlinear focused wave groups Ocean Eng. (IF 5.0) Pub Date : 2024-04-23 Junliang Gao, Chenglong Mi, Zhiwei Song, Yingyi Liu
A two-dimensional (2D) viscous numerical wave flume is developed based on OpenFOAM® to investigate the transient gap resonance problem triggered by nonlinear focused wave groups. The narrow gap is formed by two closely-spaced boxes, where the weather-side box is allowed to heave freely under wave actions, but the rear one is firmly fixed. The overset mesh method is introduced in the numerical model
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Experimental study of dynamic pressure and wave load on variform vertical cylinders under extreme waves Ocean Eng. (IF 5.0) Pub Date : 2024-04-23 Xin Xu, Jiajia Wang, Wanshui Han, Lili Xiao, Zhiqiang Li, Hao Chen
Extreme waves pose a significant threat to the proliferating marine structures, however, the impact on the vertical cylinder with different cross-sectional shapes remains inadequately evaluated. Herein, we carried out a physical experiment, comprising 45 scenarios generated by three water depths, three wave paddle velocities, and five vertical cylinder models, to measure the extreme wave-induced pressure
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Combined prediction model of joint opening-closing deformation of immersed tube tunnel based on SSA optimized VMD, SVR and GRU Ocean Eng. (IF 5.0) Pub Date : 2024-04-23 Zhongzhe Zhang, Ke Li, Hongyan Guo, Xiao Liang
Prediction of joint opening-closing deformation is crucial to ensure the operation safety of immersed tube tunnels. This paper proposes a novel deformation prediction model based on the framework of "decomposition-prediction-integration", which combines the Sparrow Search Algorithm (SSA), Variational Modal Decomposition (VMD), Support Vector Regression (SVR) and Gated Recurrent Unit (GRU). First, the
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Wave to the dynamic response of the ballast floating breakwater Ocean Eng. (IF 5.0) Pub Date : 2024-04-23 Zhen Zhang, Aifeng Tao, Qiaorui Wu, Yonghe Xie
Despite the severe nonlinearity and randomness of liquid sloshing, it can effectively reduce the rocking effect with rational application. As a result, the dynamic response of ballast breakwater in waves, inspired by the anti-rolling tank, is studied in this paper. To validate the numerical method used in this study, experiments are conducted in the wave flume as part of the current investigation,
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Optimized design of multiple tuned mass dampers for vibration control of offshore wind turbines Ocean Eng. (IF 5.0) Pub Date : 2024-04-23 Donagh McNamara, Amiya Pandit, Abdollah Malekjafarian
Offshore wind turbines (OWTs) are dynamically sensitive structures to low-frequency wind-wave loadings due to their low damping and high flexibility. This makes them vulnerable to unwanted vibrations in ocean environments. Therefore, there is a need to implement innovative vibration control devices to suppress undesired vibration and ensure their structural safety. A tuned mass damper (TMD) has been
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Energy efficient coverage path planning for USV-assisted inland bathymetry under current effects: An analysis on sweep direction Ocean Eng. (IF 5.0) Pub Date : 2024-04-23 Liang Zhao, Yong Bai
Effective coverage path planning for USVs is essential to optimize the performance of bathymetric surveys. Traditionally, it is well recognized that the best sweep direction for coverage path planning is the parallel direction that finds the minimum span of the region of interest (ROI). However, the results in this paper first reveals that it is not always the case when the water current is involved
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Effects of wind-wave-current-earthquake interaction on the wave height and hydrodynamic pressure based on CFD method Ocean Eng. (IF 5.0) Pub Date : 2024-04-23 Piguang Wang, Wanli Yu, Mi Zhao, Xiuli Du
Wind-wave-current interaction is a phenomenon which is present in many practical engineering situations and vertical earthquakes may have significant influence on the hydrodynamic pressure of seawater in regions of active seismicity. This study is devoted to probe the wave height and hydrodynamic pressure of seawater caused by the joint wind, wave, current and earthquake action based on computational
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Impact of trajectory simplification methods on modeling carbon dioxide emissions from ships Ocean Eng. (IF 5.0) Pub Date : 2024-04-23 Tadeusz Balcer, Rafal Szlapczynski, Thomas Mestl
Models of ship fuel consumption and emissions play an essential role in estimating global shipping's greenhouse gas emissions. They are also widely used for verification of reported CO emissions for systems like EU MRV (Monitoring, Reporting and Verification) or IMO DCS (Data Collection System). Such models achieve high accuracy using historical spatiotemporal information about each ship from AIS data
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End-to-end multi-sensor fusion method based on deep reinforcement learning in UASNs Ocean Eng. (IF 5.0) Pub Date : 2024-04-23 Linyao Zheng, Meiqin Liu, Senlin Zhang, Zhunga Liu, Shanling Dong
Underwater acoustic sensor networks (UASNs) have attracted considerable attention and are extensively employed for tracking underwater targets. However, due to the complex dynamics of underwater tracking environments, establishing accurate correlations between sensors remains elusive and challenging to precisely model. Traditional multi-sensor fusion methods for handling unknown correlations often
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Scale effects on the hydrodynamic performance of a submerged body Ocean Eng. (IF 5.0) Pub Date : 2024-04-23 Shuang Liu, Guanghua He, Zhengke Wang, Cheng Zhang, Zhigang Zhang
The increasing development and utilization of submerged bodies in ocean exploration have led to significant challenges due to their unique working environment. Conducting experiments with a full-scale submerged body is exceptionally difficult. To investigate scale effects on the hydrodynamic characteristics of submerged bodies, a three-dimensional numerical model for submerged bodies was established
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Large eddy simulation of wind turbulence over non-breaking and breaking waves Ocean Eng. (IF 5.0) Pub Date : 2024-04-23 Tianqi Ma, Chao Sun
Wind-wave interaction affects the wind-wave fields and the combined loading on structures. This study aims to characterize turbulent airflow over non-breaking and breaking waves using a high-fidelity two-phase model in OpenFOAM. The volume of fluid method is utilized to model the complex air–water interface. Wind turbulence is considered via prescribing it at the inlet boundary. The model is validated
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Experimental analysis of bow flare slamming and whipping responses in a ship at different sailing speeds Ocean Eng. (IF 5.0) Pub Date : 2024-04-23 Jian Zou, Hui Li, Zhiyong Sun, Bingbing Han, Zhenyang Wang
This study conducted an experimental investigation using a segmented model to determine bow flare slamming loads and whipping responses of a ship in regular waves. The model simulated the distribution of the vertical and horizontal bending stiffnesses of the hull. A continuous wavelet transform was employed to capture temporal variations in the harmonic components. The influences of sailing speeds
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Experimental and numerical investigation of fairing countermeasure for tsunami forces on three different types of bridge superstructure Ocean Eng. (IF 5.0) Pub Date : 2024-04-23 Guoji Xu, Qinghong Wu, Shihao Xue, Jinsheng Wang, Maolin Tang
By extending Wu et al. (2023)'s research of reducing tsunami loads on bridge decks through fairings and openings, this study aims to optimize fairing designs for three typical bridge superstructures, i.e., T-girders, Single-box girders, and Multi-box girders, and assess the effectiveness of fairings in mitigating hydrodynamic forces from extreme waves. A comprehensive methodology including both experimental
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Smart interference galloping energy harvester with optimally tunable gap between the bluff body and interference Ocean Eng. (IF 5.0) Pub Date : 2024-04-23 Yonghao Liu, Junyoung Lee, Youngsup Kim, Jongwon Seok
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A long sequence time-series forecasting model for ship motion attitude based on informer Ocean Eng. (IF 5.0) Pub Date : 2024-04-23 Lingyi Hou, Xiao Wang, Hang Sun, Yuwen Sun, Zhiyuan Wei
Influenced by marine environmental factors, a ship sailing at sea will experience six degrees of freedom oscillating motions. These oscillating motions pose safety risks to ship navigation and maritime operations. Especially in severe weather conditions, these oscillating motions have a significant impact on the takeoff and landing of carrier aircraft, as well as the launch of carrier missiles. Therefore
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A novel evolutionary algorithm for structural model updating with a hybrid initialization and multi-stage update strategy Ocean Eng. (IF 5.0) Pub Date : 2024-04-23 Yufeng Jiang, Chunke Ma, Shuqing Wang, Yunhui Li
Measurement errors, spatial incompleteness, and parameter uncertainties frequently lead to significant deviations between the estimated correction coefficients of structural model updating and their actual values. To address the limitations, a novel multi-objective evolutionary algorithm called MOEA-HiMs is proposed for structural model updating, which incorporates a hybrid initialization and multi-stage
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Linear wave interaction by multiple vertical cylinders of non-circular smooth cross-section: An iterative-asymptotic approach Ocean Eng. (IF 5.0) Pub Date : 2024-04-23 N.B. Disibuyuk, O. Yilmaz
The three-dimensional problem of water wave diffraction by multiple cylinders of non-circular smooth cross-sections is studied. The rigid cylinders extend from the sea bottom to the free surface in water of finite depth. The flow is described by the linear theory of potential flow. A fourth-order asymptotic solution of the diffraction problem by a single cylinder with the asymptotic parameter being
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Turbulent flow around submerged foundation arrays for ocean energy Ocean Eng. (IF 5.0) Pub Date : 2024-04-23 Saroj Gautam, Baafour Nyantekyi-Kwakye, Kevin Pope
Submerged ocean energy foundations experience dynamic loading due to the non-uniform approach velocity and wake propagation behind them. This paper investigates the unsteady turbulent flow dynamics and propagation of large-scale vortical structures around submerged foundations using a large eddy simulation. The computational domain constituted an array of eight foundations arranged in an inline configuration
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Real-time safety risk assessment of floating offshore platforms based on on-site monitoring Ocean Eng. (IF 5.0) Pub Date : 2024-04-23 Da Li, Baicheng Lyu, Xueping Bai, Wei Gao, Yidi Gao
Real-time safety risk assessment of in-service marine engineering structures is one of the key components for the intelligent development of marine resources. Floating platforms typically have weak modes and time-varying characteristics, and hence, traditional structural damage identification and safety assessment methods cannot be directly applied to floating platforms. The objective of this study
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Prediction of mooring tensions of a wave energy converter considering the effects of nonlinear axial stiffness by a deep learning neural network Ocean Eng. (IF 5.0) Pub Date : 2024-04-23 Sheng Xu, Shan Wang, C. Guedes Soares
A validated numerical tool is applied to conduct a fully coupled dynamic analysis for a wave energy converter moored by three taut nylon ropes with nonlinear axial stiffness considered. After that, a bi-directional long short-term memory neural network (Bi-LSTM) is developed to predict mooring tension time series, and the simulated data are used to train and check the accuracy of the Bi-LSTM. The influence
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Experimental and numerical study on motion characteristics of a bucket foundation during immersion process Ocean Eng. (IF 5.0) Pub Date : 2024-04-23 Tianrun Xiao, Jijian Lian, Fangdi Ye, Dongzhi Xiong, Xiong Hao
To ensure that the hexagonal bucket foundation (HBF) for offshore wind turbines (OWTs) can be immersed and landed safely at different installation water depths, an experimental study with a 1:60 scale model was conducted to investigate the motion characteristics of the HBF during the immersion process. Self-stability tests, free decay tests, and motion response tests in regular waves were performed
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Research on measurement and control system of deep-sea self-contained static cone penetration probe Ocean Eng. (IF 5.0) Pub Date : 2024-04-23 Peng Zhou, Junrong Chen, Hang Zhou, Ziqiang Ren, Zhenwu Yu, Yongqiang Ge, Zhonghui Zhou, Jianling Zhou, Yulin Si, Jiawang Chen
The geotechnical engineering properties of seabed soils hold vital significance in various marine engineering domains, including offshore petroleum platforms, underwater tunnels, oil and gas pipelines, submarine cables, topographic surveys, and underwater disaster forecasting. However, existing equipment for measuring seabed geotechnical parameters generally suffers from issues such as the inability
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A study on wave climate variability along the nearshore regions of Bohai Sea based on long term observation data Ocean Eng. (IF 5.0) Pub Date : 2024-04-22 Qingsheng Miao, Jinkun Yang, Zhifeng Wang, Yansheng Zhang, Yang Yang, Guanghao Wei, Feng Ding, Libin Cheng
The Bohai Sea off the coast of northern China plays important economic and ecological roles. No studies have been conducted on wave characteristics in the Bohai Sea nearshore area using ocean station data in the past. Observational data (1998–2022) from eight ocean-stations in the Bohai Sea were used in the present study. Overall, wave height () was small; winter seasons had higher than summer seasons
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A study on the interaction of waves with a submerged vertical elastic plate present in either layer of a two-layer fluid Ocean Eng. (IF 5.0) Pub Date : 2024-04-22 Najnin Islam, Somdutta Kayal, Souvik Kundu
The problems of interactions between an elastic plate and surface as well as interface waves are considered and analyzed using the theory of linearized water waves. Considering the ocean’s multilayered nature, a two-layered fluid system that serves as the foundation for a more complex multilayered fluid model is examined. It is taken into consideration when an elastic plate is present in either layer
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A fast and accurate hybrid method for short-term forecasting significant wave height Ocean Eng. (IF 5.0) Pub Date : 2024-04-22 Sheng Xu, Longfei Xiao, Huidong Zhang
This paper proposes a hybrid method for forecasting significant wave height (SWH). The wavelet decomposition algorithm is applied to decompose the original signal into different components, and suitable models are selected to predict wave heights for each component. To validate the performance of the proposed hybrid model in forecasting SWH with varying characteristics, wave data measured from three
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Insights into turbulent flow structure and energy dissipation in centrifugal pumps: A study utilizing time-resolved particle image velocimetry and proper orthogonal decomposition Ocean Eng. (IF 5.0) Pub Date : 2024-04-22 Bo Chen, Lu Yu, Xiaojun Li, Zuchao Zhu
The purpose of the study is to investigate the flow structure and energy dissipation mechanism within centrifugal pump impellers. The velocity fields at the mid-sections of the flow passages of 4- and 5-blade impellers were measured under various flow rates using the Time-resolved Particle Image Velocimetry (TR-PIV) technique; the proper orthogonal decomposition (POD) analysis was performed to extract
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Investigation of front hydrofoil position influence on the hydrofoil-assisted craft Ocean Eng. (IF 5.0) Pub Date : 2024-04-22 Karim Akbari Vakilabadi, Hamid Reza Ghafari, Hassan Ghassemi
The hydrofoil is utilized to generate lift force and craft center of gravity (CoG) rise-up, resulting in reduced total resistance and improved performance of hydrofoil-assisted craft. This study focuses on the performance of a hydrofoil-assisted craft equipped with a double front foil and a single rear foil. The position of the front hydrofoil is adjusted by shifting it back and ahead by one chord
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On the spectral wave climate of the French Atlantic Ocean Ocean Eng. (IF 5.0) Pub Date : 2024-04-22 Ludovica Sartini, Alessandro Antonini
The accurate description of wave climate at different spatio-temporal scales requires the application of advanced statistical models together with a good knowledge of geophysical processes. Furthermore, accurate modelling of multimodal sea states is of primary importance for most of offshore and coastal activities, such as wave energy device optimization, maritime design practice and for safety at
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Simplified analytical method for predicting the large deformation of stiffened plates with initial cracks under repeated impacts Ocean Eng. (IF 5.0) Pub Date : 2024-04-22 Jiacheng Xu, Yuhao Guo, Zikang He, Zhengjie Li, Gang Liu, YiWei He
The impact resistance capacity of structures can be affected by the formation of cracks. To address the issue of repeated impacts on structures with initial cracks, a relationship was established between cracks and the energy dissipation of stiffened plates based on rigid–plastic theory. A simplified analytical method was proposed to predict the large plastic deformation of stiffened plates with initial
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Wave excitation force prediction for arrays of wave energy converters in directional waves Ocean Eng. (IF 5.0) Pub Date : 2024-04-22 Zhenquan Zhang, Jian Qin, Shuting Huang, Yanjun Liu, Gang Xue
The implementation of advanced control strategies is an effective means of maximizing the energy production of wave energy converters (WECs), and most of them require future wave excitation forces to determine the optimal control sequence. The WECs deployed in arrays can enable a significant reduction in the cost of wave energy and improve prediction performance by incorporating excitation forces from
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Investigation on target point approaching control of bionic robotic fish in static flow Ocean Eng. (IF 5.0) Pub Date : 2024-04-22 Kangzheng Wang, Guanwen Chen, Qixin Wang, Yong Zhong
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An efficient procedure for modal seismic response analysis of axisymmetric structures surrounded by water Ocean Eng. (IF 5.0) Pub Date : 2024-04-22 Ramtin Kouhdasti, Najib Bouaanani
This paper presents a new procedure for the seismic response assessment of water-surrounded axisymmetric structures through the inclusion of earthquake-induced hydrodynamic effects into input ground motion accelerations. The resulting modified time-history and spectral ground motion accelerations can then be applied directly to the dry axisymmetric structure ( without water) through dynamic modal superposition
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Multi-AUV cooperative control and autonomous obstacle avoidance study Ocean Eng. (IF 5.0) Pub Date : 2024-04-22 Yixiao Zhang, Qi Wang, Yue Shen, Ning Dai, Bo He
In response to the intricate marine environment and the need for diverse, intelligent, and large-scale operations, clustered Autonomous Underwater Vehicles (AUVs) have emerged as a pivotal trend in AUV oceanic applications. This paper delves into three key aspects of clustered AUV control: optimal formation assembly, dynamic cooperative control, and autonomous obstacle avoidance. The formation assembly
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Seismic-tsunami fragility analysis for box-girder simple-support bridge with transverse RC constrainers Ocean Eng. (IF 5.0) Pub Date : 2024-04-22 Heng Mei, Anxin Guo
In recent decades, earthquakes and subsequent tsunamis have increasingly affected coastal bridges. The sequential occurrence of these hazards has frequently led to numerous bridge destructions owing to the separated girder-pier configuration and limited constraints on girders. The failure mechanisms of these bridges are complicated because of the separate configuration and complex loads induced by
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Collaborative ship scheduling decision model for green tide salvage based on evolutionary population dynamics Ocean Eng. (IF 5.0) Pub Date : 2024-04-21 Naibin Tang, Xiaoliang Wang, Song Gao, Bo Ai, Benshuai Li, Hengshuai Shang
Since 2007, green tide outbreaks of have occurred continuously in the Yellow Sea, seriously damaging the coastal ecosystem and affecting urban economic development. Currently, the disposal of is primarily performed through ship salvage operations. However, humans schedule salvage operations, which makes them subjective and inefficient. Scheduling tasks for ships requires the coordination of available
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ROV trajectory tracking control based on disturbance observer and combinatorial reaching law of sliding mode Ocean Eng. (IF 5.0) Pub Date : 2024-04-21 Gaosheng Luo, Shimin Gao, Zhe Jiang, Chuankun Luo, Wenfeng Zhang, Huanhuan Wang
To ensure that underwater remotely operated vehicles have the ability to complete trajectory tracking in the presence of external disturbances and model parameter uncertainties, this paper proposes a double-closed-loop integrative sliding mode ROV tracking control based on the nonlinear expansion state observer. Firstly, to address the issue of oscillatory vibrations in the stable state of the dual
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Numerical study on stem-generated turbulence due to emergent rigid vegetation in water waves Ocean Eng. (IF 5.0) Pub Date : 2024-04-20 Jun Tang, Yuxi Chen, Yongming Shen, Shirui Cao
Based on the RANS equations and applying the waves2Foam solver in OpenFOAM, the study numerically investigated the turbulent kinetic energy () generated due to emergent rigid vegetation in water waves. The numerical results show that the generated due to emergent vegetation in water waves increases with decreasing water depth and increasing wave height and period, as well as vegetation density and
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Dynamic response analysis of a semisubmersible floating offshore wind turbine subjected to mooring line failure under normal and extreme environmental conditions Ocean Eng. (IF 5.0) Pub Date : 2024-04-20 A. Subbulakshmi, Mohit Verma
Floating offshore wind turbines (FOWTs) offer a significant opportunity for harnessing wind energy and achieving clean energy goals. This paper investigates the effects of mooring line failure in semisubmersible FOWTs under normal and extreme environmental conditions. The OC4 DeepCwind type semisubmersible with an NREL 5 MW wind turbine is considered for investigating the behavior of FOWT under intact
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Drag reduction performance of discrete superhydrophobic surfaces in von Kármán swirling flow Ocean Eng. (IF 5.0) Pub Date : 2024-04-20 Shuai Qiao, Chujiang Cai, Chong Pan, Yanpeng Liu, Qingfu Zhang
Enhancing the energy efficiency and mitigating environmental pollution in maritime transportation relies significantly on minimizing frictional drag of ships. In this study, we employ wettability dividing lines and convex stripes to discretize the continuous air layer on superhydrophobic surfaces, offering a mechanism to enhance their drag reduction efficacy. Initially, we theoretically analyze the
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The influence of bottom disturbances on wave generation in a viscous liquid in the presence of uniform current Ocean Eng. (IF 5.0) Pub Date : 2024-04-20 I.M. Prasad, H. Behera, B.N. Mandal
In the present paper, the effect of bottom disturbances on wave generation in a viscous liquid in the presence of uniform current is studied. The wave potential and Stokes stream function are used to formulate this problem. Multiple integrals representing the free surface elevation are obtained by mathematical analysis using the Laplace transform in time and the Fourier transform in space. This is
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Experimental study on focused wave breaking on an inclined plate Ocean Eng. (IF 5.0) Pub Date : 2024-04-20 Jingbo Qing, Jiabin Liu, Anxin Guo
This study conducts an experimental investigation into the impact of focused wave breaking on an inclined plate, examining characteristics including wave shape, acoustic properties, and impact pressure. The wave's pressure characteristics are primarily dictated by the patterns of wave impact. Variations in the pattern of wave impact are observed with changes in the focal position of the wave group
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Prediction of pressure drop in solid-liquid two-phase pipe flow for deep-sea mining based on machine learning Ocean Eng. (IF 5.0) Pub Date : 2024-04-20 Chuyi Wan, Hongbo Zhu, Shengpeng Xiao, Dai Zhou, Yan Bao, Xu Liu, Zhaolong Han
In deep-sea mining, the accurate and rapid prediction of the pressure drop in a solid–liquid two-phase pipe flow (SLPF) with different parameters including particles, pipes, and flow fields, remains an issue yet to be fully resolved. In this study, an extensive investigation of the pressure drop in a slpf is conducted using machine-learning techniques. By collecting 1290 sets of data from 13 experimental
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Assessment for burst failure of subsea production pipeline systems based on machine learning Ocean Eng. (IF 5.0) Pub Date : 2024-04-20 Yichi Zhang, Lele Yang, Hui Fang, Yuxin Ma, Bo Ning
Subsea production system occupies an important position in the development of deep-sea resources. As a key part of the subsea production system, the safety and reliability of the pipeline system of the subsea production system is crucially important. In recent years, with the development of artificial intelligence technology, the use of machine learning algorithms for large-scale complex pipeline system
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A kinematic model for collaborative icebreaker convoy operations in ice-covered waters Ocean Eng. (IF 5.0) Pub Date : 2024-04-20 Weibin Zhang, Ye Xiao, Cong Liu, Mingyang Zhang, Long Wang, Luqi Feng
Icebreaker assistance is a common yet intricate operation in ice-covered waters, frequently leading to collisions between ships and icebreakers. This underscores the need for advanced kinematic models to improve safety and coordination in convoy operations. Consequently, this paper introduces a kinematic model for guiding intelligent ships under icebreaker assistance. The model, grounded in the Traffic
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The effect of forward speed on hydrodynamic response of a containership in head waves Ocean Eng. (IF 5.0) Pub Date : 2024-04-20 Ye Lu, Qiu Jin, Ji Yang, Chao Tian, Hailong Si, Qingyun Zhou
Hydrodynamic and hydroelastic responses of a large container ship advancing forward in head regular waves are analysed by experimental study and three-dimension (3D) linear frequency domain hydroelasticity theory. A set of model tests for a 20,000 TEU containership were carried out to investigate the ship hydroelastic characteristics in the seakeeping wave basin of CSSRC. The natural frequency and
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Study on wake characteristics of fixed wind turbines and floating wind turbines arranged in tandem Ocean Eng. (IF 5.0) Pub Date : 2024-04-20 Kai Wang, Siqi Chen, Jiahao Chen, Mengshang Zhao, Yifeng Lin
Because of the growing demand for floating wind turbines with a limited number of floating prototypes, offshore wind farms require a hybrid arrangement of fixed and floating wind turbines. Studying the wake characteristics of bottom-fixed and floating wind turbines, as well as the layout optimization of hybrid wind farms, is important for utilizing more wind energy through hybrid wind farms. In this
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Floating offshore wind farm installation, challenges and opportunities: A comprehensive survey Ocean Eng. (IF 5.0) Pub Date : 2024-04-20 Sunghun Hong, Jade McMorland, Houxiang Zhang, Maurizio Collu, Karl Henning Halse
The deployment of floating offshore wind farms marks a pivotal step in unlocking the vast potential of offshore wind energy and propelling the world towards sustainable energy solutions. Despite the compelling prospects of floating wind technology, its implementation is challenging. Complex installation procedures, associated high costs, and evolving regulations can hinder widespread adoption. However
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Parametric analysis on the frequency lock-in phenomenon of an elastic hydrofoil Ocean Eng. (IF 5.0) Pub Date : 2024-04-20 Fugeng Li, Xusheng Li, Shili Sun, Zibin Wang, Xiaoshen Ning, Jian Hu
Vortex-induced vibration (VIV) of hydrofoils is a pivotal concern in the field of ocean engineering. This study performs a parametric analysis on VIV of an elastic hydrofoil, specifically focusing on the vortex shedding frequency, trailing edge vibration and vortex intensity. The effects induced by vortex shedding are captured through combining the finite volume solid stress method and the Shear Stress
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Reinforcement learning-based moving-target enclosing control for an unmanned surface vehicle in multi-obstacle environments Ocean Eng. (IF 5.0) Pub Date : 2024-04-19 Qiang Wang, Chun Liu, Yizhen Meng, Xiaoqiang Ren, Xiaofan Wang
This paper investigates the moving-target enclosing problem in multi-obstacle environments for an unmanned surface vehicle (USV) with complex unknown factors, including target dynamics, vehicle dynamics, and disturbances. A reinforcement learning-based moving-target enclosing control scheme is proposed to ensure collision-free behavior and bolster the enclosing capability. Specifically, an extended
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Numerical investigation of vortex-induced vibrations (VIV) of a rotating cylinder in in-line and cross-flow directions subjected to oscillatory flow Ocean Eng. (IF 5.0) Pub Date : 2024-04-19 Ubaid Ur Rehman, Adnan Munir, Niaz Bahadur Khan, Ming Zhao, Muhammad Kashif, Mohammad S. Islam, Zeeshan Saeed, Mian Ashfaq Ali
This study investigates vortex-induced vibration (VIV) generated by a rotating circular cylinder across various rotation rates ( = 0, 0.25, 0.50, 0.75, and 1) subjected to oscillatory flow through two-dimensional numerical simulations. Numerical simulations are performed for two Keulegan-Carpenter () numbers, 5 and 10, at Reynolds number () of 150. A wide range of Reduced Velocity () is considered
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Testing methods for multi-energy ship energy management system: A systematic review Ocean Eng. (IF 5.0) Pub Date : 2024-04-19 Hanyou Liu, Ailong Fan, Yongping Li, Nikola Vladimir
There is a lack of comprehensive and systematic research on ship energy management system (EMS) testing. This study firstly adopts the bibliometric method to review the current status and trend of ship EMS testing. Second, by comparing with vehicle EMS testing in terms of objectives, structure, optimisation, and characteristics, the challenges faced by ship EMS testing are explained. Again, the ship
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Control co-design optimization of nonlinear wave energy converters Ocean Eng. (IF 5.0) Pub Date : 2024-04-19 Habeebullah Abdulkadir, Ossama Abdelkhalik
This paper presents a study in which both the control and the shape of a Wave Energy Converter (WEC) are optimized simultaneously. A heaving point absorber WEC is assumed. To optimize the shape of the WEC’s buoy, nonlinear hydrodynamics need to be evaluated. One main contribution of this paper is the integration of nonlinear hydrodynamics and nonlinear control during the optimization of the WEC’s buoy
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Effects of dynamic load application, irregular wave conditions, and base flexibility on the structural response of a vertical pile platform Ocean Eng. (IF 5.0) Pub Date : 2024-04-18 Kevin Tobar Fuentes, Christian Ledezma
The dynamic structural response of a vertical pile port platform under the action of irregular wave loads considering soil-structure interaction is studied. Deck displacement and bending moment on the piles were evaluated for a set of structural, hydraulic, and geotechnical parameters. Static structural analyses with the maximum base shear produced by wave loads and dynamic time-history analyses are
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Communication topology for AUV formation consensus based on optimal cost control under time-varying communication and input delays Ocean Eng. (IF 5.0) Pub Date : 2024-04-18 Jian Xu, Shunxing Wei, Liangang Yin
This study investigates the optimal communication topology for consensus in autonomous underwater vehicle (AUV) formations, considering both leader-following and leaderless scenarios. Initially, a second-order dynamic model of the AUV is established using the feedback linearization method. To address time-varying delays, a universal predictor-based consensus protocol is introduced, capable of operation
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Effect of padeye offset ratio on keying behaviours and capacity of square plate anchors in clay Ocean Eng. (IF 5.0) Pub Date : 2024-04-18 Li Cheng, Fujun Niu, Muhammad S. Hossain, Qi Wang, Youngho Kim
This paper reports the effect of padeye offset ratio on the keying behaviours and capacity of square plate anchors in clay. The investigation is conducted through three-dimensional large deformation finite element analyses using the Remeshing and Interpolation Technique with Small Strain in ABAQUS. Strain rate dependency of the undrained shear strength and soil remoulding are accounted for adopting
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An accurate and efficient method to analyze the short-term extreme tension distribution of mooring line under irregular waves Ocean Eng. (IF 5.0) Pub Date : 2024-04-18 Hui-Min Hou, Yong Liu
The short-term extreme tension distribution of the mooring line is often calculated by fully random time-domain simulations, which is acceptably accurate but extremely time-consuming. As an alternative approach, the Constrained NewWave method can significantly reduce the computational duration of nonlinear dynamic analysis and may be used for estimating the short-term extreme tension distribution.
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Vibration mitigation of spar-buoy floating wind turbines using a nonlinear energy sink Ocean Eng. (IF 5.0) Pub Date : 2024-04-18 Sara Ying Zhang, Guibin Tan, Yanfei Deng, Yongkang Zhang, Yong Wang, Zhongze Wang
This work investigates the possibility of mitigating the wind-wave exerted vibration of floating offshore wind turbines using a nonlinear energy sink (NES). The vibration mitigation of floating wind turbines using passive linear control strategies have been intensively investigated, however, the effectiveness of the linear absorbers only works in a narrow frequency band, resulting in limited vibration