Ocean EngineeringPub Date : 2025-06-30DOI: 10.1016/j.oceaneng.2025.122000
Pu Xu , Jixiang Zheng , Weiwei Lin , Yiming Hu , Naiquan Ye
{"title":"Numerical acceleration method for static and dynamic analysis of deepwater laying pipelines","authors":"Pu Xu , Jixiang Zheng , Weiwei Lin , Yiming Hu , Naiquan Ye","doi":"10.1016/j.oceaneng.2025.122000","DOIUrl":"10.1016/j.oceaneng.2025.122000","url":null,"abstract":"<div><div>The deepwater pipelay finite element model often uses relatively small time steps for numerous iterative calculations to ensure sufficient precision, resulting in significant computational time consumption. In this paper, a novel numerical acceleration method is proposed, combining the vector form intrinsic finite element (VFIFE) method with GPU parallel techniques to address this issue. Efficient GPU computational solvers for static and dynamic analyses of deepwater J-lay and S-lay pipelines are developed by utilizing CUDA-based algorithms to handle key mechanical processes, including the calculation of pipeline internal forces and moments, top excitation, pipe-stinger roller interaction, hydrodynamic forces, and pipe-seabed soil interaction, etc. The method is applied to shell element, beam element, and refined beam element models, with coding strategies optimized for GPU parallel execution. Subsequently, localized pipeline solvers and global pipelay solvers are established to showcase the method's potential to significantly reduce computational time while maintaining accuracy. This study emphasizes the advantages of combining the VFIFE method with GPU parallel techniques and contributes efficient computational solvers for the mechanical analysis of deepwater pipeline laying.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"338 ","pages":"Article 122000"},"PeriodicalIF":4.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144513674","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ocean EngineeringPub Date : 2025-06-30DOI: 10.1016/j.oceaneng.2025.122042
R. Ganesh
{"title":"Evaluation of undrained breakout capacity of shallowly buried plate anchors in cohesive soils using a tension-truncated Tresca strength criterion","authors":"R. Ganesh","doi":"10.1016/j.oceaneng.2025.122042","DOIUrl":"10.1016/j.oceaneng.2025.122042","url":null,"abstract":"<div><div>Plate anchors are widely used to provide economical mooring systems for many offshore infrastructures. Previous studies examining the undrained breakout capacity of plate anchors in purely cohesive soils were predominantly based on the classical Tresca (CT) strength criterion, which assumes equal uniaxial yield strengths in compression and tension. However, the observed uniaxial tensile strength of cohesive soils is often much lower than its compression counterpart, emphasizing the need to consider realistic tensile strength in practical engineering applications. This research investigates the potential impact of a tensile strength cutoff on the ultimate undrained breakout capacity of shallowly buried horizontal plate anchors in purely cohesive soils, utilizing a tension-truncated Tresca (TT) strength criterion. The analysis employs the discrete sum method based on horizontal slices within the upper bound plasticity theory to calculate the undrained breakout capacity of plate anchors under varying shapes, including circular, square, rectangular, and strip. A comparison of results obtained using both CT and TT strength criteria reveals a significant effect of the tension cutoff on the ultimate undrained breakout capacity of plate anchors in cohesive soils. Additionally, the study explores the influence of different anchor-soil interface conditions and the associated breakout failure surfaces under typical parameter combinations. Remarkably, the results of this study align well with the available numerical and experimental results in the existing literature.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"338 ","pages":"Article 122042"},"PeriodicalIF":4.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144519112","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ocean EngineeringPub Date : 2025-06-30DOI: 10.1016/j.oceaneng.2025.121936
Lin Zhou , Zhongchao Deng , Nan Zhou , Guiqiang Bai , Hongde Qin , Zhongben Zhu
{"title":"Boundary adaptive and dynamic neural network dual layer path planning algorithm for polar multi-mission area under-ice feature scanning","authors":"Lin Zhou , Zhongchao Deng , Nan Zhou , Guiqiang Bai , Hongde Qin , Zhongben Zhu","doi":"10.1016/j.oceaneng.2025.121936","DOIUrl":"10.1016/j.oceaneng.2025.121936","url":null,"abstract":"<div><div>Autonomous Underwater Vehicles play a crucial role in polar under-ice feature scanning, contributing to explore ecological changes in polar regions. However, multi-mission under-ice feature scanning face significant challenges due to complex boundaries, energy constraints, and environmental uncertainties. To address these issues, this paper proposes a Boundary Adaptive and Dynamic Neural Network Dual Layer path planning algorithm, which consists of coverage path planning and connectivity path planning. First, Boundary Adaptive Coverage based on Dynamic Grid algorithm is introduced, which optimizes coverage paths by adaptively inserting boundary waypoints to improve coverage efficiency of AUV. Second, Dynamic Neural Network based on Ocean Current Energy Consumption algorithm is proposed, which integrates ocean current effects to save energy and real time replan connection paths. Simulation results demonstrate that it outperforms current methods in terms of total path length, turning times, and energy consumption, and its practicality is verified by “Xing Hai 1000” AUV field experiments.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"338 ","pages":"Article 121936"},"PeriodicalIF":4.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144513667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ocean EngineeringPub Date : 2025-06-30DOI: 10.1016/j.oceaneng.2025.121991
Mohammad Saemian, Josep M. Bergadà
{"title":"Active flow control actuators on wind turbines; comprehensive review","authors":"Mohammad Saemian, Josep M. Bergadà","doi":"10.1016/j.oceaneng.2025.121991","DOIUrl":"10.1016/j.oceaneng.2025.121991","url":null,"abstract":"<div><div>Active flow control (AFC) techniques are designed to add or subtract momentum into/from the flow field in order to modify (usually delay) the boundary layer separation. AFC strategies are being considered in many industrial applications, particularly in aeronautics/aerodynamics, where the early separation of the boundary layer drastically affects the forces acting on an airfoil. AFC devices are divided into three different types, including fluidic actuators, plasma ones, and moving surfaces. The present paper is a comprehensive review of the different AFC actuators employed in wind turbines, including Dielectric Barrier Discharge (DBD) plasma actuator (PA), synthetic jet actuator (SJA), and suction and blowing actuators. All AFC applications on Horizontal axis wind turbines (HAWT) and Vertical ones (VAWT), whether reporting numerical or experimental methods, are considered. The actuation when employing moving surfaces shall be presented in a different review. AFC implementation on wind turbines needs to employ a strategy consisting of setting/optimizing the AFC parameters, as well as considering an energy assessment. This review is highlighting the research that has already addressed these points. Eventually, a comparison of the main achievements gathered from previous publications is presented and discussed in detail to assist researchers and engineers and give them a tool to design future AFC applications on WTs.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"339 ","pages":"Article 121991"},"PeriodicalIF":4.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144518616","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ocean EngineeringPub Date : 2025-06-30DOI: 10.1016/j.oceaneng.2025.121897
Renjie Yang , Yu Zhang , Yangye He , Menglan Duan , Shuang Wang
{"title":"Local buckling and compressive strain capacity of metallurgically clad pipes with dent defects at girth welds","authors":"Renjie Yang , Yu Zhang , Yangye He , Menglan Duan , Shuang Wang","doi":"10.1016/j.oceaneng.2025.121897","DOIUrl":"10.1016/j.oceaneng.2025.121897","url":null,"abstract":"<div><div>Metallurgically clad pipes (MCPs) have effectively addressed corrosion issues associated with deep-sea oil and gas transportation. However, MCPs frequently suffer dent damage resulting from third-party impacts during the installation and operational conditions. Such dent defects may precipitate local buckling failures under combined loading scenarios involving bending moments, axial forces, and internal pressure. In this study, a three-dimensional finite element model incorporating girth welds is developed to investigate the local buckling failure mechanism of MCPs induced by dents located in weld regions under combined loading conditions. Traditional strain-based assessment approaches are inherently limited and thus inadequate for evaluating MCPs with dent-induced damage in the girth weld area. To overcome this limitation, a novel calculation method utilizing the far-field average strain approach is proposed to predict local buckling failure accurately. Comprehensive analyses examine the influence of critical parameters, namely including bending moment, internal pressure, external pressure, dent depth, and the spatial proximity between dents and girth welds, on the MCP's buckling behavior and compressive strain capacity. The proposed method is validated through comparisons with established critical buckling failure loads. Results indicate that dents near girth weld regions significantly compromise the limited compressive strain capacity of MCPs, with dent depth, internal pressure, and external pressure notably influencing the local buckling failure modes. A predictive formula quantifies the limited compressive strain capacity, incorporating the effects of external pressure, internal pressure, dent depth, and dent-to-weld distance. The prediction errors are all within 10 %, satisfying the requirements of practical engineering applications. The proposed method provides a valuable reference for the integrity assessment of metallurgically clad pipes.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"338 ","pages":"Article 121897"},"PeriodicalIF":4.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144513670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ocean EngineeringPub Date : 2025-06-30DOI: 10.1016/j.oceaneng.2025.122026
Kaihang Zhang, Wei Zhang, Qiyang Wu, Xue Du
{"title":"Adaptive fixed-time disturbance observer-based anti-saturation distributed sliding mode formation tracking control for multi-underactuated AUVs under lumped disturbances","authors":"Kaihang Zhang, Wei Zhang, Qiyang Wu, Xue Du","doi":"10.1016/j.oceaneng.2025.122026","DOIUrl":"10.1016/j.oceaneng.2025.122026","url":null,"abstract":"<div><div>During trajectory tracking missions, formations of multi-underactuated autonomous underwater vehicles (AUVs) encounter substantial challenges from lumped disturbances—including unknown environmental effects and model parameter uncertainties—as well as actuator input saturation. To address these issues, this paper proposes a distributed anti-saturation integral sliding mode formation control strategy. The proposed framework incorporates an adaptive fixed-time disturbance observer (AFDO) that employs adaptive parameters to compensate for lumped disturbances, ensuring system stability and reliable performance. To prevent actuator saturation, a novel fixed-time dynamic auxiliary system is introduced to limit actuator inputs within permissible bounds. Additionally, a distributed anti-saturation sliding mode controller using a fixed-time integral sliding mode surface is designed to achieve rapid and stable formation control independent of the initial system state. This approach mitigates saturation effects and ensures a prompt system response. Numerical simulations confirm the effectiveness and reliability of the proposed control strategy.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"339 ","pages":"Article 122026"},"PeriodicalIF":4.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144518617","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ocean EngineeringPub Date : 2025-06-30DOI: 10.1016/j.oceaneng.2025.121933
Jian Tan , Yu Zhang , Yulong Zhang , Le Sun , Shuai Cui , Chen An , Segen F. Estefen
{"title":"Vortex-induced vibrations of variable cross-section CWPs under axially varying tension: Numerical investigation with three flow profiles","authors":"Jian Tan , Yu Zhang , Yulong Zhang , Le Sun , Shuai Cui , Chen An , Segen F. Estefen","doi":"10.1016/j.oceaneng.2025.121933","DOIUrl":"10.1016/j.oceaneng.2025.121933","url":null,"abstract":"<div><div>Vortex-induced vibration (VIV) poses significant challenges to the structural reliability of Cold-water pipes (CWPs) in Ocean Thermal Energy Conversion (OTEC) systems, particularly when geometric variation and non-uniform axial tension are present. This study develops a high-fidelity semi-analytical framework that combines the Generalized Integral Transform Technique (GITT) with Sturm-Liouville Eigenvalues Using Theta matrices (SLEUTH) method. To analyze the VIV of CWPs with variable cross-sections under three realistic flow profiles: uniform, linear shear, and exponential shear. Validation against finite element simulations and existing literatures confirms the accuracy of the proposed model. Results demonstrate that while uniform flow produces stable standing-wave responses, linear and exponential shear flows introduce progressive mode transitions, nonlinear mode coupling, and broadened excitation spectra. Notably, exponential shear induces spatially asynchronous vortex shedding and chaotic lock-in behavior, revealing energy transfer from dominant to higher-order modes. These phenomena are strongly influenced by the interplay between velocity gradients and structural heterogeneity. The findings provide critical insights into the physical mechanisms governing VIV and offer design guidance for mitigating fatigue-critical responses in CWPs. This work addresses gaps in the current literature by accounting for coupled geometric-tension-flow effects and proposes a robust computational tool for future engineering optimization of marine energy systems.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"338 ","pages":"Article 121933"},"PeriodicalIF":4.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144513665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ocean EngineeringPub Date : 2025-06-30DOI: 10.1016/j.oceaneng.2025.122005
Yunling Ye , Jin Gan , Huabing Liu , Weiguo Wu , Lin Wang , Junyu Guo , He Li
{"title":"Bending behaviour of rigid-flexible combined inflatable membrane structures for floating bridge modules","authors":"Yunling Ye , Jin Gan , Huabing Liu , Weiguo Wu , Lin Wang , Junyu Guo , He Li","doi":"10.1016/j.oceaneng.2025.122005","DOIUrl":"10.1016/j.oceaneng.2025.122005","url":null,"abstract":"<div><div>This paper investigates the load-bearing characteristics of rigid-flexible combined inflatable floating bridge modules. A simplified numerical model incorporating air-membrane coupling is first developed and validated by experimental data. Accordingly, a numerical method is subsequently employed to analyse the structural behaviour of the floating bridge module, including load-deformation feature, failure modes, and the effects of key structural parameters on the structural behaviour. The results reveal an initial linear load-deformation followed by softening, leading to local buckling failures. The parametric study indicates that an increased deck plate thickness, deck height, and internal pressure effectively enhance the load-bearing capacity of the floating bridge module. An equivalent stiffness prediction model is constructed with a prediction error of 0.594 % against numerical results. Overall, this study advances the understanding of load-bearing characteristics for inflated rigid-flexible combined floating bridge modules.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"338 ","pages":"Article 122005"},"PeriodicalIF":4.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144513666","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ocean EngineeringPub Date : 2025-06-30DOI: 10.1016/j.oceaneng.2025.121817
Shasha Ren , Deqiong Kong , Yueming Du , Yuan Chen , Bin Zhu
{"title":"Numerical modeling of multi-directional lateral behaviour of pile foundations for offshore wind turbines in clay","authors":"Shasha Ren , Deqiong Kong , Yueming Du , Yuan Chen , Bin Zhu","doi":"10.1016/j.oceaneng.2025.121817","DOIUrl":"10.1016/j.oceaneng.2025.121817","url":null,"abstract":"<div><div>This study investigates the lateral behavior of pile foundations for offshore wind turbines (OWT) under various loading paths in clay, including arc-shaped and cross-shaped trajectories, as well as the impact of occasional deviated loads on displacement accumulation. A finite element model that incorporates soil softening behaviour is established and validated against centrifuge tests conducted by the authors as well as reported in the literature. Following that a parametric study is conducted to explore the complex pile-soil interactions and examine how multi-directional loading influences the behavior of pile foundations. The results show that multi-directional loading significantly enhances pile displacement accumulation, with non-coaxial behavior observed as a mismatch between peak load and peak displacement. It is for the first time revealed that the most undesirable deviated loading angle ranges between 45° and 60°, and even one occasional event of deviated load can substantially impact cumulative displacement. The study further emphasizes the need to introduce a multi-directional loading factor to the design of OWT pile foundations.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"338 ","pages":"Article 121817"},"PeriodicalIF":4.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144513671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ocean EngineeringPub Date : 2025-06-30DOI: 10.1016/j.oceaneng.2025.122041
Yi Qin , Hangjun Yu , Dingliang Chen , Yongfang Mao
{"title":"A prognostic driven dynamic predictive maintenance decision-making model for offshore wind turbine systems","authors":"Yi Qin , Hangjun Yu , Dingliang Chen , Yongfang Mao","doi":"10.1016/j.oceaneng.2025.122041","DOIUrl":"10.1016/j.oceaneng.2025.122041","url":null,"abstract":"<div><div>The existing researches on predictive maintenance for offshore wind turbine systems primarily focus on optimizing maintenance costs over a long term, lacking a more detailed assessment of the balance between utilizing the remaining useful life value of degraded components and optimizing maintenance costs. Moreover, the current methods on spare parts management and maintenance scheduling for wind turbines have poor dynamic response characteristics and cannot effectively utilize the prognostic information. To achieve the optimized health management of wind turbine systems, this paper explores a prognostic driven dynamic predictive maintenance decision-making method. Considering two typical health management activities of wind turbine systems, an individual maintenance decision-making model and multi-component maintenance decision-making model are constructed, where two new expected net operation and maintenance cost functions are defined. Based on these two models and the dynamical prognostic information, a system-level dynamic maintenance decision-making model is established to obtain the optimized maintenance schedule of wind turbine systems. Finally, the effectiveness and superiority of the proposed method are validated through an actual offshore wind turbine dataset and several simulation cases.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"338 ","pages":"Article 122041"},"PeriodicalIF":4.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144513672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}