Ocean Engineering最新文献_第8页

PSO algorithm -improved particle breakage model for calcareous sands based on breakage energy 基于破碎能量的粒子群算法改进钙质砂颗粒破碎模型

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2026-04-30 Epub Date: 2026-02-19 DOI: 10.1016/j.oceaneng.2026.124698

Wei Li , Wenpeng Liu , Junbiao He , Jingli Chen , Alisher Imanov , Nan Zhang

{"title":"PSO algorithm -improved particle breakage model for calcareous sands based on breakage energy","authors":"Wei Li , Wenpeng Liu , Junbiao He , Jingli Chen , Alisher Imanov , Nan Zhang","doi":"10.1016/j.oceaneng.2026.124698","DOIUrl":"10.1016/j.oceaneng.2026.124698","url":null,"abstract":"<div><div>Establishing appropriate breakage constitutive models to predict soil behaviors of calcareous sand holds significant importance for marine geotechnical engineering. However, the majority of existing breakage constitutive models employ the breakage index derived from changes in particle size distribution. This method cannot capture the continuous evolution of particle breakage. To address this issue, this paper calculated the particle breakage energy <span><math><mrow><msub><mi>E</mi><mi>B</mi></msub></mrow></math></span> of calcareous sand based on the stress-dilatancy breakage model framework to characterize particle breakage. The Particle Swarm Optimization (PSO) algorithm was used to rapidly calibrate the initial friction angle <span><math><mrow><msub><mi>ϕ</mi><mi>f</mi></msub></mrow></math></span>. The <span><math><mrow><msub><mi>ϕ</mi><mi>f</mi></msub></mrow></math></span> and <span><math><mrow><msub><mi>E</mi><mi>B</mi></msub></mrow></math></span> were incorporated into the extended modified Mohr-Coulomb model considering particle breakage (MMC-PB). A nonlinear evolution equation was proposed to simulate the hardening-softening behavior of soil. This paper established a novel PSO-improved breakage model for calcareous sand based on particle breakage energy (PSO-MMC-PBE). The model was implemented in the finite element (FE) software ABAQUS to simulate the triaxial compression of calcareous sand and compared with test results. The comparison results show that this model can effectively simulate the stress-strain behavior of calcareous sand and capture the micro-breakage process. The model provides a potential approach for the numerical assessment of the stability of structures on calcareous sand.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"353 ","pages":"Article 124698"},"PeriodicalIF":5.5,"publicationDate":"2026-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147387251","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 theoretical approach for axial compressive analysis of helical piles supporting offshore jacket structures 支撑海上导管结构的螺旋桩轴压分析的理论方法

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2026-04-30 Epub Date: 2026-02-20 DOI: 10.1016/j.oceaneng.2026.124602

Xiaodong Shao , Wenbing Wu , Xiaodong Gao , Meijuan Xu , Yunpeng Zhang , M. Hesham El Naggar , Hao Liu

{"title":"A theoretical approach for axial compressive analysis of helical piles supporting offshore jacket structures","authors":"Xiaodong Shao , Wenbing Wu , Xiaodong Gao , Meijuan Xu , Yunpeng Zhang , M. Hesham El Naggar , Hao Liu","doi":"10.1016/j.oceaneng.2026.124602","DOIUrl":"10.1016/j.oceaneng.2026.124602","url":null,"abstract":"<div><div>Helical piles are extensively employed to support offshore jacket structures and withstand lateral loads through a push-pull mechanism. Nevertheless, there is still a dearth of research on their compressive capacity associated with settlement, especially for multi-helix piles. This limitation impedes the advancement of response-based design methodologies. To address this gap, this study presents a comprehensive unified theoretical framework for analyzing the axial compressive response of multi-helix piles associated with both individual bearing mode and cylindrical shear mode. The analysis framework is based on two key components: (1) a multi-fictitious soil pile model that model effectively integrating the two distinct bearing mechanisms, and (2) a semi-analytical solution for helical pile response derived using the transfer matrix method. Validation against several reported cases demonstrates that the proposed method provides a reliable tool for predicting the axial compressive behavior of helical piles across diverse scenarios, ensuring its applicability to practical engineering design. Furthermore, parametric studies offer valuable insights into the factors influencing pile response and provide practical guidelines for optimizing helix spacing design. This study contributes to advancing the understanding of helical pile behavior and supports the development of more efficient and reliable design methodologies for offshore helical piles.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"353 ","pages":"Article 124602"},"PeriodicalIF":5.5,"publicationDate":"2026-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147387253","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

Investigation on scour evolution of bridge groups under tidal currents 潮流作用下桥群冲刷演化研究

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2026-04-30 Epub Date: 2026-02-20 DOI: 10.1016/j.oceaneng.2026.124683

Songyuan Tan , Zhongxiang Liu , Zhiyu Jiang , Tong Guo , Zhen Sun , Dongdong Jia

{"title":"Investigation on scour evolution of bridge groups under tidal currents","authors":"Songyuan Tan , Zhongxiang Liu , Zhiyu Jiang , Tong Guo , Zhen Sun , Dongdong Jia","doi":"10.1016/j.oceaneng.2026.124683","DOIUrl":"10.1016/j.oceaneng.2026.124683","url":null,"abstract":"<div><div>Local scour threatens closely spaced bridge groups, identifying the evolution mechanism of scour is crucial for proposing targeted protection measures, thereby sustaining the safety of structures in service. This study investigates the scour evolution around a bridge group under tidal reflux peak conditions, using a combination of flume experiments and numerical simulations. Besides, the influence of key hydraulic and sedimentary parameters on scouring dynamics is quantitatively elucidated via a series of parameter analyses. The numerical results demonstrate a strong correlation with the experimental data. The upstream structures, within a certain distance, create a wake-shielding effect that alleviates scour around downstream piers. However, closely spaced bridge groups tend to exacerbate scour, with the deepest scour occurring in wake zones where flow deflection intensifies shear stresses. The study reveals that short pier spacing, multiple piers, and continuous bridge group construction lead to increased scour severity. Among the factors influencing scour, flow velocity had the most significant impact, followed by water depth and sediment grain size. As water depth increases, the reduction in near-bed flow velocity and vortex intensity slows the growth of scour depth. Additionally, scour intensity increases with higher flow velocities, smaller sediment grain sizes, and an optimal water depth.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"353 ","pages":"Article 124683"},"PeriodicalIF":5.5,"publicationDate":"2026-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147387260","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

Numerical evaluation on the flow field of an aquaculture vessel 水产养殖船流场的数值评价

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2026-04-30 Epub Date: 2026-02-20 DOI: 10.1016/j.oceaneng.2026.124702

Jian Ji , Lilan Zhou , Neng Zhang , Bin Liu , C. Guedes Soares

{"title":"Numerical evaluation on the flow field of an aquaculture vessel","authors":"Jian Ji , Lilan Zhou , Neng Zhang , Bin Liu , C. Guedes Soares","doi":"10.1016/j.oceaneng.2026.124702","DOIUrl":"10.1016/j.oceaneng.2026.124702","url":null,"abstract":"<div><div>This study presents a numerical investigation of the flow field distribution of a large semi-submersible hybrid aquaculture vessel in uniform flow. A coupled numerical framework is developed to simulate viscous flow behaviour inside and around the vessel. The influences of three key factors, such as the existence of the fishing net, the net solidity and the net-to-truss spacing on the flow field distribution are evaluated. The results indicate that the presence and arrangement of the fishing net have a pronounced influence on flow velocity and flow-field uniformity. It suggests that a reasonable combination of net types can effectively reduce drag force and optimize flow uniformity around the aquaculture vessel. Net solidity should be optimised to ensure both structural stability and breeding environment quality. Furthermore, the net-to-truss spacing plays a relatively important role in the spatial distribution of internal flows. The research also demonstrates the role of the fore and aft buoyancy tanks in attenuating velocity and in vortex development within and around the aquaculture vessel. This study elucidates the flow-field characteristics under different net configurations, providing insights for the design and optimisation of fishing nets.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"353 ","pages":"Article 124702"},"PeriodicalIF":5.5,"publicationDate":"2026-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147387263","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

Transformer-based multimodal target detection and projection-based pose estimation for autonomous deployment and recovery of surface-state UUVs 基于变压器的多模态目标检测和基于投影的姿态估计，用于表面状态uuv的自主部署和回收

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2026-04-30 Epub Date: 2026-02-21 DOI: 10.1016/j.oceaneng.2026.124720

Yinguang Wu, Fei Peng, Zhong Wang, Qingxu Meng

{"title":"Transformer-based multimodal target detection and projection-based pose estimation for autonomous deployment and recovery of surface-state UUVs","authors":"Yinguang Wu, Fei Peng, Zhong Wang, Qingxu Meng","doi":"10.1016/j.oceaneng.2026.124720","DOIUrl":"10.1016/j.oceaneng.2026.124720","url":null,"abstract":"<div><div>Target detection and pose estimation are critical for the autonomous deployment and recovery of water surface Unmanned Underwater Vehicles (UUVs), yet they face substantial challenges, including sparse point clouds, occlusion, insufficient feature fusion, and strict real-time constraints. To address these issues, this paper proposes a robust multimodal perception framework. First, a multimodal detection network, termed MultiFormer Net, is introduced. This network integrates a Transformer-based cross-attention mechanism to fuse image features with projected point cloud representations, and further incorporates a point-channel dual attention fusion module to effectively extract discriminative features from sparse voxel data. Second, to overcome the high computational cost and sensitivity to sparsity associated with traditional pose estimation methods, two projection-based algorithms are proposed: DensE-Pose, which leverages density entropy optimization to determine attitude angles efficiently, and Dual-PCA, which integrates the Minimum Covariance Determinant (MCD) method to robustly extract geometric structures from projected data containing outliers. Experimental results obtained from both ROS-based simulations and real-world model tests demonstrate the effectiveness of the proposed methods. Specifically, MultiFormer Net achieves a detection accuracy of 67.96% (AP at IoU = 0.75) with an inference speed of 118 FPS, significantly outperforming unimodal and existing multimodal baselines. Furthermore, the proposed pose estimation algorithms reduce computational time to 147 ms for DensE-Pose and 193 ms for Dual-PCA, much faster than ICP-based methods, while maintaining high precision. Rotation errors are constrained within 1.5°, and position errors remain below 0.8 m in complex operating scenarios, outperforming comparable methods. The proposed framework effectively balances detection accuracy with real-time performance for surface-state UUV recovery.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"353 ","pages":"Article 124720"},"PeriodicalIF":5.5,"publicationDate":"2026-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147387098","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

Eigenvalue stability analysis of a pipe conveying fluid with a squeeze film damper 带挤压膜阻尼器管道输送流体的特征值稳定性分析

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2026-04-30 Epub Date: 2026-02-19 DOI: 10.1016/j.oceaneng.2026.124663

Xinyu Zhang, Jiang Lai

{"title":"Eigenvalue stability analysis of a pipe conveying fluid with a squeeze film damper","authors":"Xinyu Zhang, Jiang Lai","doi":"10.1016/j.oceaneng.2026.124663","DOIUrl":"10.1016/j.oceaneng.2026.124663","url":null,"abstract":"<div><div>The stability of a pipeline conveying fluid is vital for its safe operation and is equally critical for mitigating underwater acoustic pollution, as flow-induced pipeline vibration is a significant source of hydrodynamic noise. This paper examines the application of a squeeze film damper (SFD) in internal flow pipelines, focusing on how the squeeze film effect affects the stability of the pipeline's eigenvalues. The objective of this study is to provide a theoretical framework for developing SFDs suitable for internal flow systems. To accomplish this, we developed a mathematical model of a fluid-conveying pipe that accounts for the effects of the SFD. We investigated the eigenvalue problem of the pipe system to understand how the squeeze film effect influences its dynamic stability. The research examined the impact of squeeze film thickness, kinematic viscosity coefficient, and the installation position of the SFD on the eigenvalue stability of the pipe system. Numerical results reveal that both the thickness of the squeeze film and the kinematic viscosity coefficient are critical factors affecting the stability of eigenvalues in the pipe system. Additionally, the mode of instability in the pipe is an important consideration when determining the optimal installation position for the SFD.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"353 ","pages":"Article 124663"},"PeriodicalIF":5.5,"publicationDate":"2026-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147387100","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

Research on container ship trajectory prediction based on the EMD-PSO-GRU-RBFNN algorithm 基于EMD-PSO-GRU-RBFNN算法的集装箱船轨迹预测研究

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2026-04-30 Epub Date: 2026-02-18 DOI: 10.1016/j.oceaneng.2026.124712

Lijun Wang , Jingyu Guan , Sisi Wang , Shenghao Liao , Jianchuan Yin , Wei Wang , Zeguo Zhang , Ronghui Li

{"title":"Research on container ship trajectory prediction based on the EMD-PSO-GRU-RBFNN algorithm","authors":"Lijun Wang , Jingyu Guan , Sisi Wang , Shenghao Liao , Jianchuan Yin , Wei Wang , Zeguo Zhang , Ronghui Li","doi":"10.1016/j.oceaneng.2026.124712","DOIUrl":"10.1016/j.oceaneng.2026.124712","url":null,"abstract":"<div><div>Ship trajectory prediction is challenging due to its strongly time-varying, non-stationary, and highly nonlinear characteristics. To address this issue, a hybrid prediction framework integrating Empirical Mode Decomposition (EMD), Particle Swarm Optimization (PSO), Gated Recurrent Unit (GRU), and Radial Basis Function Neural Network (RBFNN) is proposed. First, a PSO-RBFNN model generates preliminary predictions of vessel latitude and longitude, and residual sequences are obtained by subtracting the predicted values from the observations. EMD is then applied to decompose the residual sequence into multiple Intrinsic Mode Function (IMF) components with different frequency characteristics, along with a residual component, thereby reducing data complexity and nonlinearity. PSO is employed to optimize key hyperparameters of the RBFNN and GRU models using training and validation data, and the optimized configuration is fixed and reused for modeling all decomposed subsequences. Each component is independently modeled and predicted, and the final vessel trajectory is reconstructed by aggregating the predicted components. Validation using Automatic Identification System (AIS) data demonstrates that the proposed EMD-PSO-GRU-RBFNN model achieves strong stability and superior predictive accuracy compared with existing methods. This study provides an effective framework for high-precision ship trajectory prediction and shows considerable potential for practical maritime applications.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"353 ","pages":"Article 124712"},"PeriodicalIF":5.5,"publicationDate":"2026-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386428","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

Flow control over a horizontal cylinder by symmetrically distributed flexible body 对称分布柔性体在水平圆柱上的流动控制

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2026-04-30 Epub Date: 2026-02-18 DOI: 10.1016/j.oceaneng.2026.124675

Jianjun Zhou , Zaijin You , Jiabin Liu , Anxin Guo

{"title":"Flow control over a horizontal cylinder by symmetrically distributed flexible body","authors":"Jianjun Zhou , Zaijin You , Jiabin Liu , Anxin Guo","doi":"10.1016/j.oceaneng.2026.124675","DOIUrl":"10.1016/j.oceaneng.2026.124675","url":null,"abstract":"<div><div>The flow control over a horizontal cylinder using a flexible body was experimentally investigated in this study. The upper and lower parts of the symmetrical flexible body were attached to the submerged cylinder model in a laboratory wave–current tank. Particle image velocimetry (PIV) was used to analyze the transient interaction between the flow field and the flexible body. By varying the attachment position, length and thickness of the flexible body, the load–reduction effect on the structure was systematically examined. The experimental results demonstrate that the flexible body significantly reduces the lift under both uniform currents and wave–current conditions. The control mechanism was revealed through fluctuations in the pressure distribution and the unsteady flow characteristics. The flexible body exhibits distributed deformation and reaches its maximum curvature during the formation of the wake vortex, with a phase-lagged response to the vortex action. Optimal flow control performance occurs under an appropriate parameter combination of the flexible body. This research provides experimental evidence supporting the feasibility of using flexible structures to modulate wake dynamics for load reduction in marine engineering applications.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"353 ","pages":"Article 124675"},"PeriodicalIF":5.5,"publicationDate":"2026-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386430","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

Second-order wave excitation forces in WEC-Sim/MOST: Implementation, experimental validation, and code-to-code comparison WEC-Sim/MOST中的二阶波激励力：实现、实验验证和代码间比较

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2026-04-30 Epub Date: 2026-02-23 DOI: 10.1016/j.oceaneng.2026.124605

Davide Issoglio , Mohamed A. Shabara , Ermando Petracca , Francesco Niosi , Adam Keester , Massimo Sirigu , Giovanni Bracco

{"title":"Second-order wave excitation forces in WEC-Sim/MOST: Implementation, experimental validation, and code-to-code comparison","authors":"Davide Issoglio , Mohamed A. Shabara , Ermando Petracca , Francesco Niosi , Adam Keester , Massimo Sirigu , Giovanni Bracco","doi":"10.1016/j.oceaneng.2026.124605","DOIUrl":"10.1016/j.oceaneng.2026.124605","url":null,"abstract":"<div><div>Accurate prediction of second-order hydrodynamic loads is essential for floating bodies, including floating offshore wind turbines, wave energy converters, and hybrid wind–wave platforms. These nonlinear effects, arising from both sum- and difference-frequency forcing, are critical for capturing key response characteristics but remain challenging to model efficiently. In this work, we extend the open-source Wave Energy Converter Simulator / MATLAB for Offshore Simulation Tool by implementing second-order wave excitation forces, supporting both the full Quadratic Transfer Function formulation and the Newman approximation. The full Quadratic Transfer Function method is used for all code-to-code comparisons and experimental validation, while the Newman approximation is provided as a computationally lighter alternative. To benchmark the new capability, we perform a code-to-code comparison with OpenFAST and OrcaFlex. We then validate the enhanced model using wave-tank measurements of a 1:96 scale DeepCwind semi-submersible, showing that second-order effects are required to reproduce platform motions. The implementation employs a computationally efficient pre-computation strategy for second-order wave excitation forces, reducing simulation cost while maintaining engineering accuracy. Overall, this work advances the tool as an open-source and versatile tool for modelling floating offshore renewable-energy systems requiring second-order hydrodynamic fidelity.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"353 ","pages":"Article 124605"},"PeriodicalIF":5.5,"publicationDate":"2026-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386614","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

Investigated effects of cylinder proximity on the hydrodynamic performance of axisymmetric AUV by using CFD 利用CFD技术研究了轴对称水下航行器筒体接近度对其水动力性能的影响

IF 5.5 2区工程技术

Ocean Engineering Pub Date : 2026-04-30 Epub Date: 2026-02-18 DOI: 10.1016/j.oceaneng.2026.124637

Ngo Van He , Bui Thanh Danh , Phan Anh Tuan , Nguyen Van Duc

{"title":"Investigated effects of cylinder proximity on the hydrodynamic performance of axisymmetric AUV by using CFD","authors":"Ngo Van He , Bui Thanh Danh , Phan Anh Tuan , Nguyen Van Duc","doi":"10.1016/j.oceaneng.2026.124637","DOIUrl":"10.1016/j.oceaneng.2026.124637","url":null,"abstract":"<div><div>1Autonomous underwater vehicles (AUVs) are widely used in confined and structure-rich underwater environments such as offshore platforms, subsea mining, and infrastructure inspection. In such conditions, hydrodynamic performance is strongly influenced by wall proximity effects, which modify resistance and flow separation, thereby affecting energy efficiency and operational safety. This study presents a numerical investigation of the hydrodynamic performance of an axisymmetric AUV operating near a cylindrical offshore structure. Commercial CFD simulations are conducted for Reynolds numbers ranging from 0.87 × 10<sup>6</sup> to 3.48 × 10<sup>6</sup> and clearance distances defined by the ratio h/L<sub>A</sub> from 0.32 to 1.61. The near-wall results are systematically compared with open-water conditions. The results indicate that the resistance coefficient of the AUV remains approximately constant at 0.005 in open water. However, in near-wall operation, it increases significantly up to 64.3%, reaching values between 0.0091 and 0.0136. When h/L<sub>A</sub> < 0.9, resistance increases sharply as the clearance decreases, whereas beyond this value, the wall effect diminishes and the resistance coefficient stabilizes. Flow field analysis reveals pronounced pressure asymmetry and enhanced flow separation in close-proximity conditions, explaining the observed resistance increase. These findings contribute to improving energy efficiency, maneuverability, and operational safety of AUVs operating near offshore structures and in confined underwater environments.</div></div>","PeriodicalId":19403,"journal":{"name":"Ocean Engineering","volume":"353 ","pages":"Article 124637"},"PeriodicalIF":5.5,"publicationDate":"2026-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147386348","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