Ocean Engineering最新文献_第10页

A partitioned coupling framework for occupant head injury assessment under water entry impact of a free-fall lifeboat 自由落体救生艇入水冲击下乘员头部损伤评估的分区耦合框架

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2026-04-15 Epub Date: 2026-02-11 DOI: 10.1016/j.oceaneng.2026.124559

Ningge Fan , Gong Chen , Shunhua Chen , Yingying Lin , Di Wang

{"title":"A partitioned coupling framework for occupant head injury assessment under water entry impact of a free-fall lifeboat","authors":"Ningge Fan , Gong Chen , Shunhua Chen , Yingying Lin , Di Wang","doi":"10.1016/j.oceaneng.2026.124559","DOIUrl":"10.1016/j.oceaneng.2026.124559","url":null,"abstract":"<div><div>During the water entry stage, a free-fall lifeboat experiences strong impact and complex two-phase flow, which exposes occupants to injury risk. Existing assessments often rely on combined acceleration response (CAR), a global evaluation standard, for quick screening. However, occupant head injuries during lifeboat impact with the water surface can be fatal, while CAR lacks the precision needed for head-specific assessment. To address this limitation, a partitioned coupling framework for accurate occupant head injury evaluation subjected to water entry impact of a free-fall lifeboat is developed. The fluid and lifeboat motion are solved utilizing a fluid-rigid body interaction manner, in which the fluid is discretized with the finite volume method (FVM). The occupant response is then computed with the dynamic explicit finite element method (FEM) with the aid of a one-way coupling strategy, which improves computational efficiency while maintaining high accuracy. A standardized data interface links the two solvers and transfers displacement and orientation histories from the matched-node region. Occupant head injury is evaluated with the head injury criterion (HIC) using an occupant-seat-restraint finite element model that includes a Hybrid III 50th percentile dummy, a shell seat, and a four-point safety belt. The accuracy and effectiveness of the developed framework are well demonstrated, including a comparison with the 35 mph sled test data. Finally, a parametric study is conducted to examine the influence of vertical velocity, horizontal velocity, and pitch angle on the dynamic response and head injury of an occupant subjected to water entry impact, where the results are compared with those computed via CAR. The proposed framework provides reliable head acceleration histories efficiently, enabling occupant head injury assessment over a wide range of water-entry conditions.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"352 ","pages":"Article 124559"},"PeriodicalIF":5.5,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146154121","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}

引用次数: 0

Dynamic behavior of deep-sea floor drill rigs under the rheological contact force 流变接触力作用下深海钻机的动力特性

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2026-04-15 Epub Date: 2026-02-12 DOI: 10.1016/j.oceaneng.2026.124566

Jingyuan Zhang , Hailong Li , Zhifan Zhang , Jie Yan , Longkan Wang , Guiyong Zhang

{"title":"Dynamic behavior of deep-sea floor drill rigs under the rheological contact force","authors":"Jingyuan Zhang , Hailong Li , Zhifan Zhang , Jie Yan , Longkan Wang , Guiyong Zhang","doi":"10.1016/j.oceaneng.2026.124566","DOIUrl":"10.1016/j.oceaneng.2026.124566","url":null,"abstract":"<div><div>The landing of the deep-sea floor drill rig is a crucial step in its underwater deployment prior to operation. However, traditional Kelvin models fail to accurately describe the rheological behaviors of sediments during the landing impact process. To address this limitation, this paper proposes an improved contact force model that innovatively incorporates the Zener model—capable of characterizing rheological phenomena such as relaxation and creep effects of sediments. The validity of the proposed model is verified through comparison with experimental data, and the maximum fitting error is reduced by 80.45% compared with the traditional Kelvin model. A dynamic model of the deep-sea floor drill rig under rheological contact forces is established using MATLAB. The dynamic interaction (including loading, unloading, and rebound) between the drill rig and the seabed is characterized by defining the motion cycle and three force-bearing phases. This enables the prediction of the drill rig's dynamic parameters under rheological contact forces and resolves the dynamic calculation challenge associated with its landing process. Finally, the effects of landing velocity and drill rig mass on the dynamic parameters and the duration proportion of the three phases are investigated. In addition, the influence of rheological sediment parameters on the extreme dynamic values of the drill rig is analyzed, and it is found that sediment stiffness exerts the most significant effect on these extreme values. Then, Two-factor analysis of variance (ANOVA) is employed to evaluate the drill rig's dynamic behavior under the combined influence of landing velocity and mass, and the safe landing parameter range is determined. This study provides a theoretical reference for the structural design and safety validation of deep-sea floor drill rigs.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"352 ","pages":"Article 124566"},"PeriodicalIF":5.5,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146154123","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}

引用次数: 0

Evaluation of fatigue performance of post-fire AH32 marine steel welded joints using digital image correlation AH32钢火灾后焊接接头疲劳性能的数字图像相关评价

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2026-04-15 Epub Date: 2026-02-12 DOI: 10.1016/j.oceaneng.2026.124591

Chenfeng Li , Guanchen Wei , Zixiong Kang , Huilong Ren , Guoqing Feng

{"title":"Evaluation of fatigue performance of post-fire AH32 marine steel welded joints using digital image correlation","authors":"Chenfeng Li , Guanchen Wei , Zixiong Kang , Huilong Ren , Guoqing Feng","doi":"10.1016/j.oceaneng.2026.124591","DOIUrl":"10.1016/j.oceaneng.2026.124591","url":null,"abstract":"<div><div>To enhance the safety assessment and repair design reliability of ship structures after fire, fatigue tests are conducted on AH32 marine steel butt joints after elevated-temperature exposure. The fatigue stresses at the welded joints are measured using complementary strain gauge and digital image correlation (DIC) techniques. The results demonstrate that, compared to the strain gauge method, DIC technology can directly acquire strain data at the weld based on digital images, enabling a correction of the <em>S-N</em> curve obtained by the strain gauge method. The modified <em>S-N</em> curve reveals a significant influence of post-fire temperature on the fatigue life of the butt joints, with fatigue life first increasing and then decreasing as the temperature rises. Comparative analysis between experimental <em>S-N</em> curves and those recommended by the International Institute of Welding (IIW) reveals systematic assessment differences: The IIW nominal stress curve demonstrates conservative predictions when validated against strain gauge data. In contrast, the IIW notch stress curve exhibits non-conservative behavior when evaluated using DIC results. Finally, scanning electron microscopy (SEM) is employed to analyze the fatigue fracture morphology, explaining the influence of post-fire temperature on fatigue performance from a micromechanical perspective.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"352 ","pages":"Article 124591"},"PeriodicalIF":5.5,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146154179","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}

引用次数: 0

Mechanical behavior of marine coral sand - coral clay mixtures reinforced with bionic honeycomb polymer grid: Experimental and artificial intelligence methods 仿生蜂窝聚合物网格增强海洋珊瑚砂-珊瑚粘土混合物的力学行为：实验和人工智能方法

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2026-04-15 Epub Date: 2026-02-05 DOI: 10.1016/j.oceaneng.2026.124406

Kaiwei Xu , Jiaqi Luo , Jiaming Zhao , Danda Shi , Zhiming Chao , Titi Sui

引用次数: 0

Free-field response of a seawater-frozen seabed system under obliquely incident SV waves 斜入射SV波作用下海水-冻结海床系统的自由场响应

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2026-04-15 Epub Date: 2026-02-05 DOI: 10.1016/j.oceaneng.2026.124525

Huipeng Jiang , Qiang Ma

{"title":"Free-field response of a seawater-frozen seabed system under obliquely incident SV waves","authors":"Huipeng Jiang , Qiang Ma","doi":"10.1016/j.oceaneng.2026.124525","DOIUrl":"10.1016/j.oceaneng.2026.124525","url":null,"abstract":"<div><div>Submarine permafrost occurs in shallow cold-region shelves, where seismic shaking may threaten offshore infrastructure. This study derives an analytical free-field solution for a coupled seawater-frozen seabed-bedrock system subjected to obliquely incident plane SV waves. Seawater is modelled as an inviscid compressible acoustic layer, the frozen seabed as a frozen saturated three-phase porous medium described by LCAM (Linearised Contact-Adhesion Model), and the bedrock as an elastic half-space. Using Helmholtz-decomposed potentials, Snell's law, and the transmission-reflection (T-R) method, closed-form frequency-domain displacements are obtained, capturing P-SV mode conversion within the frozen layer. Dimensionless horizontal and vertical surface-to-base transfer functions are defined, and pulse-excited time histories are reconstructed via inverse FFT. The solution is verified against published benchmark results for coupled seawater-seabed-bedrock systems. Parametric analyses examine temperature, porosity, incident angle, cementation-related Poisson's ratio, ice-skeleton contact condition, and depth. Results show that both the overlying seawater and the incident angle strongly reshape the transfer functions, with the vertical response particularly sensitive to fluid-solid coupling and interference/mode conversion. Lower temperatures reduce displacements and shift dominant peaks to higher frequencies, whereas higher porosity and weaker inter-phase constraint increase amplification. The formulation provides efficient baseline motions for subsequent seawater-frozen seabed-structure interaction analyses at laterally uniform sites.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"352 ","pages":"Article 124525"},"PeriodicalIF":5.5,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146116760","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}

引用次数: 0

Digital twin system for deepwater well construction: Enhancing operational efficiency and safety 深水井建设数字孪生系统：提高作业效率和安全性

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2026-04-15 Epub Date: 2026-02-09 DOI: 10.1016/j.oceaneng.2026.124378

Dongsheng Xu , Jin Yang , Haiyan Zheng , Bin Chen , De Yan , Jianchun Fan , Qingying Tang , Yingfang Zhou

{"title":"Digital twin system for deepwater well construction: Enhancing operational efficiency and safety","authors":"Dongsheng Xu , Jin Yang , Haiyan Zheng , Bin Chen , De Yan , Jianchun Fan , Qingying Tang , Yingfang Zhou","doi":"10.1016/j.oceaneng.2026.124378","DOIUrl":"10.1016/j.oceaneng.2026.124378","url":null,"abstract":"<div><div>Deepwater oil and gas resources are vital to global energy supply, yet their development often faces challenges such as prolonged construction cycles, low efficiency, high emissions, and operational failures. To tackle these challenges, this study analyzes how operational and geotechnical factors affect conductor installation time and bearing capacity, during jetting and waiting stages. The intelligent optimization algorithm integrating MT-FCNN, LSTM, and PSO was proposed. A digital twin system for deepwater well construction is established for the first time, employing a modularly coupled architecture to integrate installation and post-installation processes. Validation results show that the DWC system exhibits strong performance in predicting jetting flow rates and controlling ROP during conductor installation. The model achieved a coefficient of determination R<sup>2</sup> above 0.95 and MAPE below 6 %. In beach-scale experiments, all measured values of time-varying bearing capacity fell within the 95 % confidence interval of the DWC system predictions, demonstrating its high accuracy. Finally, the case study was conducted to analyze the impact of flow rate and waiting time on construction parameters and operational decisions. The findings provide a solid theoretical and technical foundation for intelligent decision-making and enhanced reliability in deepwater well construction.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"352 ","pages":"Article 124378"},"PeriodicalIF":5.5,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192085","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}

引用次数: 0

Fully nonlinear analysis of wave diffraction by cylinders on a sloping terrain using the Irrotational Green-Naghdi model 用irrotation Green-Naghdi模型对倾斜地形上圆柱波衍射的完全非线性分析

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2026-04-15 Epub Date: 2026-02-07 DOI: 10.1016/j.oceaneng.2026.124375

Gao-fei Su , Ying Gou , Bo Zhou , Bin Teng , Yuzhu Pearl Li

{"title":"Fully nonlinear analysis of wave diffraction by cylinders on a sloping terrain using the Irrotational Green-Naghdi model","authors":"Gao-fei Su , Ying Gou , Bo Zhou , Bin Teng , Yuzhu Pearl Li","doi":"10.1016/j.oceaneng.2026.124375","DOIUrl":"10.1016/j.oceaneng.2026.124375","url":null,"abstract":"<div><div>This study develops a finite element numerical model based on the Irrotational Green-Naghdi (IGN) equations to investigate wave diffraction around an infinitely long array of side-by-side vertical cylinders under head-sea conditions on a sloping seabed. In numerical implementation, the horizontal momentum equations of the IGN equations are solved simultaneously in the local coordinate system of curved boundaries to ensure precise satisfaction of the impermeable boundary condition. Model validation is performed through wave flume experiments measuring wave diffraction around a single vertical cylinder. The numerical predictions of wave forces and free water surface elevations show strong consistency with experimental measurements. The validated model is applied to systematically examine how water depth, seabed slope, cylinder spacing, and cylinder radius influence the wave forces. Numerical analysis demonstrates that wave resonance occurs when the spacing between adjacent cylinders equals half, one, or two times the incident wavelength, amplifying the wave forces. Moreover, for incident wave frequencies just below the resonance frequency, the steep seabed can cause peaks or troughs of the wave surface elevation behind the cylinders to shift between adjacent cylinders, resulting in wave force reduction.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"352 ","pages":"Article 124375"},"PeriodicalIF":5.5,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192081","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}

引用次数: 0

Cavitation-sand synergistic erosion in Francis turbines: Three-Phase flow simulation and runner optimization for enhanced operational stability 混流式水轮机的空化-砂协同侵蚀：三相流模拟和转轮优化，以提高运行稳定性

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2026-04-15 Epub Date: 2026-02-07 DOI: 10.1016/j.oceaneng.2026.124563

Longgang Sun , Tingting Ji , Zhaoning Wang , Yanyan Li , Pengcheng Guo

{"title":"Cavitation-sand synergistic erosion in Francis turbines: Three-Phase flow simulation and runner optimization for enhanced operational stability","authors":"Longgang Sun , Tingting Ji , Zhaoning Wang , Yanyan Li , Pengcheng Guo","doi":"10.1016/j.oceaneng.2026.124563","DOIUrl":"10.1016/j.oceaneng.2026.124563","url":null,"abstract":"<div><div>Francis turbines operating under sediment-laden conditions suffer from cavitation and sediment erosion, whose synergistic interaction critically threatens operational stability. This study employs a three-phase numerical framework for a Francis turbine and develops a multi-objective optimization strategy integrating hydraulics enhancement, cavitation alleviation, and erosion resistance. Two inter-blade cavitation vortices and a sheet-like flow-separation cavitation are identified at different guide vane openings, causing flow blockage, velocity redistribution, and particle accumulation near vortex peripheries. Erosion is strongly correlated with these vortical structures, exhibiting high intensity at vortex boundaries due to elevated particle velocity and concentration, whereas remaining weak in vortex cores and wall-vortex interfaces. Runner optimization with increased inlet-edge twist effectively modifies the flow pattern and sediment transport. Under two inter-blade cavitation vortex conditions, optimized hydraulic efficiency increases by 2.858% and 1.846%, with cavitation volume reduced by 33.405% and 62.265%, and average blade erosion rate decreased by 19.659% and 23.363%, respectively. Under the sheet-like cavitation condition, hydraulic efficiency increases by 0.169%, accompanied by reductions of 91.898% in cavitation volume and 30.868% in erosion rate. Morphologically, high-erosion regions induced by inter-blade vortices are significantly alleviated. These findings elucidate cavitation-erosion coupling mechanisms and confirm the effectiveness of integrated optimization in suppressing cavitation and erosion.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"352 ","pages":"Article 124563"},"PeriodicalIF":5.5,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192159","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}

引用次数: 0

Experimental study and analysis of flow field characteristics of floating breakwaters with different cross-sectional shapes 不同断面形状浮式防波堤流场特性的试验研究与分析

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2026-04-15 Epub Date: 2026-02-06 DOI: 10.1016/j.oceaneng.2026.124527

Bin Sun , Jianyu Wang , Danyang Di , Chunyang He , Feifei Wang

{"title":"Experimental study and analysis of flow field characteristics of floating breakwaters with different cross-sectional shapes","authors":"Bin Sun , Jianyu Wang , Danyang Di , Chunyang He , Feifei Wang","doi":"10.1016/j.oceaneng.2026.124527","DOIUrl":"10.1016/j.oceaneng.2026.124527","url":null,"abstract":"<div><div>As a critical protective facility in marine engineering, floating breakwaters serve as an essential technical means for mitigating marine environmental risks and ensuring the safety of engineering structures. Given that the shape of floating breakwaters significantly influences their energy dissipation effectiveness, this study systematically investigates the wave attenuation efficiency and dynamic response characteristics of rectangular, trapezoidal, and triangular floating breakwaters. In the study, six floating breakwater models were constructed by designing trapezoidal floating breakwaters with six different base angles. A combined approach of physical wave tank experiments and numerical simulations was employed to analyze the wave attenuation performance and dynamic response characteristics of these six models. The findings reveal that under constant wave height, draft depth, and period conditions, the 45° trapezoidal floating breakwater, with its gentler slope, more effectively suppresses mooring force growth, thereby extending the service life of the floating structure. Furthermore, precise adjustment of the inclination angle enables optimization of the breakwater's wave-attenuation performance under various operational conditions.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"352 ","pages":"Article 124527"},"PeriodicalIF":5.5,"publicationDate":"2026-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"146192639","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}

引用次数: 0

Convex formulation of the maritime fleet size and mix problem considering battery electric ships 考虑纯电动船舶的海上船队规模和混合问题的凸公式

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2026-04-15 Epub Date: 2026-02-12 DOI: 10.1016/j.oceaneng.2026.124415

Antti Ritari, Jani Romanoff, Kari Tammi

引用次数: 0