Ocean Engineering最新文献_第5页

Effects of the wall shear stress on the energy dissipation in the fluid-filled riser subjected to heave motion 升沉运动下充液立管壁面剪应力对能量耗散的影响

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-09-30 DOI: 10.1016/j.oceaneng.2025.122695

Huade Cao , Dingbang Wei , Yazhi Han , Jianxin Xia , Zhenhua Zhao , Shunan Hou

{"title":"Effects of the wall shear stress on the energy dissipation in the fluid-filled riser subjected to heave motion","authors":"Huade Cao , Dingbang Wei , Yazhi Han , Jianxin Xia , Zhenhua Zhao , Shunan Hou","doi":"10.1016/j.oceaneng.2025.122695","DOIUrl":"10.1016/j.oceaneng.2025.122695","url":null,"abstract":"<div><div>For deep-sea mining risers subjected to heave motion, longitudinal vibration induces unsteady internal flow primarily governed by wall shear stress effects. This study proposes both the extended and partitioned shell-based water hammer models to analyze the axisymmetric dynamic response of fluid-filled risers under heave excitation. Three wall shear stress formulations, quasi-steady, Brunone, and weighting function-based models, are implemented to assess their impact on system energy dissipation. The numerical models are validated against experimental data from a reservoir-pipe-valve system, demonstrating good agreement with measured pressure histories. Analysis of numerical dissipation reveals that non-unity Courant numbers introduce significant artificial energy loss, whereas structural damping and wall shear stress represent the primary physical mechanisms for energy dissipations. For deep-sea mining risers under heave motion, results indicate that the choice of wall shear stress expression has negligible influence on dynamic amplification factors and energy dissipation rates. The system exhibits resonance at frequencies corresponding to both structural natural frequencies and fluid-structure interaction modes, with energy dissipation rates generally increasing with heave frequency and local maxima observed at pressure wave oscillation frequencies. These findings provide important insights of energy dissipation patterns under varying operational conditions of the deep-sea mining riser subjected to heave motion.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"342 ","pages":"Article 122695"},"PeriodicalIF":5.5,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222546","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 modelling of mooring system for integrated analysis of floating offshore wind turbines 海上浮式风力机系泊系统动力学建模

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-09-30 DOI: 10.1016/j.oceaneng.2025.122916

Jihuai Yang, Zhiqiang Hu

{"title":"Dynamic modelling of mooring system for integrated analysis of floating offshore wind turbines","authors":"Jihuai Yang, Zhiqiang Hu","doi":"10.1016/j.oceaneng.2025.122916","DOIUrl":"10.1016/j.oceaneng.2025.122916","url":null,"abstract":"<div><div>This paper presents a theoretical model and numerical tool for the dynamic analysis for mooring system of floating offshore wind turbines. The theoretical framework was built based on the lumped-mass mathematical model, with the initial configuration determined based on multi-segment catenary mooring line theory. Morison's Equation was employed to calculate the drag component of fluid damping loads, and the seabed interaction was accounted by prescribing the upthrust load on the lay-down segment. Furthermore, the dynamic mooring line module was integrated into an in-house program, <em>DARwind</em><strong><em>,</em></strong> an advanced aero-hydro-structural-servo solver designed for global dynamic analysis of floating offshore wind turbines. By incorporating the proposed mooring dynamic model, <em>DARwind</em> is enhanced using a multi-body dynamic framework, employing the Newton-Euler method alongside Kane's Dynamic Equations. Numerical simulations were conducted using <em>DARwind</em> incorporated with dynamic mooring line model, the simulation results were benchmarked against the those from <em>OpenFAST</em>. Comparative results between lumped mass and quasi-static catenary mooring line model are presented. This upgrade enables <em>DARwind</em> to capture the dynamic responses of floating offshore wind turbines with feasibility and accuracy. The analysis results demonstrate that the proposed mooring dynamic model integrates effectively with the <em>DARwind</em> program, the RMS deviations of fairlead tensions between <em>DARwind</em> and OpenFAST are less than 13 %. The underprediction of fairlead tension in quasi-static approach are highlighted. This research will upgrade <em>DARwind</em> to become a more reliable numerical tool for integrated analysis of floating offshore wind turbine.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"342 ","pages":"Article 122916"},"PeriodicalIF":5.5,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222550","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

Prediction of added resistance in regular and irregular head waves for a 1,800 TEU container ship using CFD 1800teu集装箱船规则和不规则头浪附加阻力CFD预测

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-09-30 DOI: 10.1016/j.oceaneng.2025.122991

Yechang Park , Jin-Won Yu , Jung-Eun Choi , Inwon Lee

引用次数: 0

Coupled effects of backstep structure and jet intensity on the dynamics of ventilated cavity 后台阶结构和射流强度对通风空腔动力学的耦合影响

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-09-30 DOI: 10.1016/j.oceaneng.2025.123009

Yangqing Liu, Min Xiang, Ziguang Huang, Zenghui Xu, Shengquan Zhang

{"title":"Coupled effects of backstep structure and jet intensity on the dynamics of ventilated cavity","authors":"Yangqing Liu, Min Xiang, Ziguang Huang, Zenghui Xu, Shengquan Zhang","doi":"10.1016/j.oceaneng.2025.123009","DOIUrl":"10.1016/j.oceaneng.2025.123009","url":null,"abstract":"<div><div>Supercavitation reduces underwater vehicle drag by forming a supercavity, yet its stability is highly sensitive to projectile configuration and engine exhaust jets. Therefore, it is essential to investigate supercavity behavior under coupled effects of these two factors. A numerical method based on the OpenFOAM platform is developed for compressible gas-liquid two-phase flow and experiments are conducted for further validation. This study reveals the influence of jets with various intensities on cavity morphology and stability. Then the coupled effects of backstep structures and jet intensities on cavity closure characteristics, the stability, and pressure fluctuations are systematically analyzed. The results demonstrate that increased jet intensity transitions the cavity from a supercavity to a partial cavity, accompanied by high-frequency pressure oscillations and rapid velocity reduction along the jet axis. A larger backstep diameter suppresses the upstream propagation of the re-entrant jet, stabilizing pressure within the cavity and maintaining a consistent thrust-to-drag ratio under different jet intensities. However, an excessively large backstep diameter disturbs the cavity interface and increases drag. An initial supercavity-to-projectile diameter ratio of approximately 2.1 helps maintain favorable cavity morphology and dynamic characteristics. These findings offer a novel perspective for the matching design of the backstep structure of the projectile and the engine exhaust jet.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"342 ","pages":"Article 123009"},"PeriodicalIF":5.5,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222416","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

A two-stage ship path planning method based on trial maneuvers 基于试验机动的两阶段船舶路径规划方法

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-09-30 DOI: 10.1016/j.oceaneng.2025.122936

Yangyu Zhou , Shuxiu Liang , Qiaofeng Ma , Qingren Xue , Jia Li , Ziyu Deng , Ran Yan

{"title":"A two-stage ship path planning method based on trial maneuvers","authors":"Yangyu Zhou , Shuxiu Liang , Qiaofeng Ma , Qingren Xue , Jia Li , Ziyu Deng , Ran Yan","doi":"10.1016/j.oceaneng.2025.122936","DOIUrl":"10.1016/j.oceaneng.2025.122936","url":null,"abstract":"<div><div>Ship path planning is a core technology in achieving fully autonomous ship navigation. This paper proposes a novel path planning method based on ship trial maneuvers for nearshore waters. The method consists of two main stages: global route planning and local path planning. For global route planning, ocean environment numerical models are employed to forecast nearshore hydrodynamic environments. Then, the improved Dijkstra algorithm is developed to plan the shortest travel-time routes, followed by key waypoint extraction using Douglas-Peucker (DP) algorithm. For local path planning, collision avoidance strategy in close-quarters single-ship encounters is primary focus. The predefined trial maneuver strategy is established considering International Regulations for Preventing Collisions at Sea (COLREGs). By integrating hydrodynamic environmental data with a ship motion model, trajectories with different maneuvers strategies are simulated. These trajectories are assessed for collision risk to select the safest maneuver. The key advantage of this method is its integration of critical dynamic constraints for ship navigation in real sea, which is often neglected in traditional methods. Case studies demonstrate the effectiveness of this method, showing that the proposed method effectively plans feasible paths for ships in nearshore waters, offering important support for navigation safety and autonomous ship development.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"342 ","pages":"Article 122936"},"PeriodicalIF":5.5,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222545","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

Enhancement of hydrodynamics modeling for floating offshore wind turbines using multi-objective genetic algorithm 基于多目标遗传算法的海上浮式风力机流体动力学建模

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-09-30 DOI: 10.1016/j.oceaneng.2025.122842

Doyal Sarker, Tri Ngo, Tuhin Das

{"title":"Enhancement of hydrodynamics modeling for floating offshore wind turbines using multi-objective genetic algorithm","authors":"Doyal Sarker, Tri Ngo, Tuhin Das","doi":"10.1016/j.oceaneng.2025.122842","DOIUrl":"10.1016/j.oceaneng.2025.122842","url":null,"abstract":"<div><div>Floating offshore wind turbines (FOWTs) are pivotal for enhancing the U.S. energy supply by harnessing deep-water wind resources with higher capacity factors. Accurate hydrodynamic modeling is essential for predicting FOWT responses to varying sea states, as hydrodynamic coefficients—added mass, damping, and drag—govern platform dynamics. However, these coefficients are highly sensitive to platform geometry and environmental conditions, presenting significant challenges for predictive modeling. This study presents an optimization framework that automates the tuning of hydrodynamic coefficients across varying sea states. The hydrodynamics model is developed based on Morison’s equation and enhanced with second-order wave kinematics, wave stretching, MacCamy-Fuchs corrections, depth-dependent coefficients, and component-wise discretization. A multi-objective Genetic Algorithm (GA) is employed to calibrate coefficients using data from free-decay and irregular wave tests. The framework treats hydrodynamic coefficients as design variables and evaluates fitness based on dynamic responses in both time and frequency domains. To support generalization, regression models are developed to estimate damping coefficients under varying sea states. Validation on two reference platforms—the OC3 Spar-Buoy and VolturnUS-S Semi-Submersible—demonstrates the framework’s adaptability. Results show that incorporating depth- and sea-state-dependent coefficients significantly improves response predictions compared to decay-test-only models, highlighting the benefits of automated hydrodynamic optimization for FOWT modeling.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"342 ","pages":"Article 122842"},"PeriodicalIF":5.5,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222326","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

Buckling of a hollow double-folded sandwich pressure shell under hydrostatic external pressure 静水外压作用下空心双折叠夹芯受压壳的屈曲

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-09-30 DOI: 10.1016/j.oceaneng.2025.122982

Yongmei Zhu , Zhijing Zuo , Xilu Zhao

{"title":"Buckling of a hollow double-folded sandwich pressure shell under hydrostatic external pressure","authors":"Yongmei Zhu , Zhijing Zuo , Xilu Zhao","doi":"10.1016/j.oceaneng.2025.122982","DOIUrl":"10.1016/j.oceaneng.2025.122982","url":null,"abstract":"<div><div>Based on the principle of origami engineering, a carbon fiber-reinforced polymer (CFRP) pressure shell with a hollow double-folded sandwich structure was designed to enhance its buckling under hydrostatic external pressure. The structure integrates a checkerboard-patterned hollow core with localized folding units, combining a lightweight PVC core and high-strength CFRP skins to maximize the sectional moment of inertia while minimizing mass. This configuration capitalizes on the multi-stability and energy-absorption advantages inherent to origami-inspired geometries. The ultimate buckling load was investigated through nonlinear numerical analysis and hydrostatic pressure tests. Results demonstrate that the shell buckled symmetrically along its central axis, with experimental data showing high repeatability. Nonlinear simulations agreed with experimental values within a 10 % margin. Crucially, the origami-engineered shell exhibited a significantly higher buckling load than a traditional double-layer shell of equivalent mass, confirming the efficacy of the sandwich architecture in boosting structural stability.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"342 ","pages":"Article 122982"},"PeriodicalIF":5.5,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222548","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

A deep learning-based method for rapid prediction of transient loads on flexible regions of local flexible hydrofoils 基于深度学习的局部柔性水翼柔性区瞬态载荷快速预测方法

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-09-30 DOI: 10.1016/j.oceaneng.2025.123003

Jian Dong , Jinling Lu , Kai Wang , Like Wang , Wei Fu

{"title":"A deep learning-based method for rapid prediction of transient loads on flexible regions of local flexible hydrofoils","authors":"Jian Dong , Jinling Lu , Kai Wang , Like Wang , Wei Fu","doi":"10.1016/j.oceaneng.2025.123003","DOIUrl":"10.1016/j.oceaneng.2025.123003","url":null,"abstract":"<div><div>As an essential component of maritime renewable energy apparatus, the rational design of local flexible hydrofoils is crucial for enhancing energy capture efficiency. However, the efficacy of optimization process is limited by the inability of conventional preliminary design frameworks to rapidly acquire transient load distributions, which are necessary for precise subsequent design to establish the appropriate optimization threshold. To determine the relationship between geometric parameters, boundary conditions, and transient load, a hybrid neural network is established, which includes convolutional neural networks (CNN) for geometric feature extraction, bidirectional long short-term memory (BiLSTM) for dynamic information capture, and an attention mechanism to enhance critical features. The modified grey wolf optimizer, combining nonlinear adaptation and adaptive dynamic weight factors, enhances prediction performance through hyperparameter optimization. The CNN-BiLSTM-Attention model captures dynamic pressure load fluctuations with an accuracy of approximately 96 %, displaying strong generalization across varied geometric factors and boundary conditions. Nevertheless, the inherent unsteady spatiotemporal characteristics of unstable flows such as vortex shedding and transient separation increases the difficulty of accurate prediction. Compared to existing algorithms, the improved Grey Wolf Optimizer (IGWO) has higher robustness and convergence rates for complicated nonlinear problems. Furthermore, hyperparameter optimization enhances prediction accuracy and computing efficiency. These results demonstrate the effectiveness of this deep-learning approach for improving the design of localized flexible hydrofoils.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"342 ","pages":"Article 123003"},"PeriodicalIF":5.5,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222335","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

The influence of rotating cylinder with curved plates on Vortex-Induced Vibration 带弯曲板的旋转圆柱对涡激振动的影响

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-09-30 DOI: 10.1016/j.oceaneng.2025.123012

Huichao Li , Xue Jiang , Jiwei Song , Boyang Li , Baoshou Zhang , Hualin Yang , Xiaoyu Qin

引用次数: 0

Experimental investigation of anti-roll performance of a ship with flap-type fin stabilizers in oblique waves at zero speed 带襟翼减摇器的船舶零航速斜波减摇性能试验研究

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2025-09-30 DOI: 10.1016/j.oceaneng.2025.123010

Jialong Jiao , Yuanting Zou , Wenhua Xu , Zheng Yang

{"title":"Experimental investigation of anti-roll performance of a ship with flap-type fin stabilizers in oblique waves at zero speed","authors":"Jialong Jiao , Yuanting Zou , Wenhua Xu , Zheng Yang","doi":"10.1016/j.oceaneng.2025.123010","DOIUrl":"10.1016/j.oceaneng.2025.123010","url":null,"abstract":"<div><div>This paper experimentally studies the anti-rolling performance of ship in oblique waves by using flap-type fin stabilizers. Without loss of generality, a standard model of S175 containership is made and the essential experimental devices including fin stabilizer system and forced rolling system are assembled to carry out the tank experiments. The Proximal Policy Optimization (PPO) algorithm is used to control the movement of fin stabilizers by data driven and artificial intelligence technologies. The PPO model was trained with the help of the forced rolling device in an efficient and cost-effective way when the ship model was in calm water. Tank experiments were conducted for the ship in both regular and irregular waves with bow quarter oblique wave heading. The experimental results demonstrated that the developed anti-rolling scheme exhibits very good performance to reduce ship roll motion in oblique wave environments over a wide range of wave frequency conditions, which highlights the potential application values of the developed intelligent anti-rolling control system.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"342 ","pages":"Article 123010"},"PeriodicalIF":5.5,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145222329","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