Applied Ocean Research最新文献_第5页

Improved diffuse interface-immersed boundary method for three-dimensional multiphase fluids–structure interaction with moving contact lines 移动接触线三维多相流体与结构相互作用的改进型扩散界面浸润边界法

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-08-18 DOI: 10.1016/j.apor.2024.104181

{"title":"Improved diffuse interface-immersed boundary method for three-dimensional multiphase fluids–structure interaction with moving contact lines","authors":"","doi":"10.1016/j.apor.2024.104181","DOIUrl":"10.1016/j.apor.2024.104181","url":null,"abstract":"<div><p>In the realm of numerical algorithms for investigating interactions between multiphase fluids and structure, the accurate computation of moving contact lines (MCLs) dynamics and the substantial computational resource demands bring challenges in three-dimensional simulations. In this study, an improved diffuse interface-immersed boundary method is proposed to efficiently investigate three-dimensional multiphase fluids–structure interactions. The present work commences with the development of the explicit correction scheme and the simplified Dirac function coefficient, designed to efficiently implement the immersed boundary technique. To validate the effectiveness and accuracy of the proposed method, the simulations of water entry and exit for a half-buoyant sphere are carried out, which conclusively demonstrate that the proposed method offers significant advantages in terms of both efficiency and accuracy, faithfully capturing the dynamic response of solid structures and the substantial deformation of free surfaces at the three-dimensional scale. Additionally, a comparative analysis of the results obtained using the proposed method for the free water exit of a hollow sphere against previous experimental data is conducted, highlighting the promising potential of the proposed method for applications.</p></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142002303","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

Interpretation of the global tsunami amplitude distribution due to the air pressure waves from the 2022 Hunga Tonga–Hunga Ha`apai volcanic eruption 2022 年洪加-汤加-洪加-哈`阿派火山爆发气压波引起的全球海啸振幅分布解读

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-08-17 DOI: 10.1016/j.apor.2024.104168

引用次数: 0

Hydro-acoustic optimization of propellers: A review of design methods 螺旋桨的水声优化：设计方法综述

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-08-17 DOI: 10.1016/j.apor.2024.104158

{"title":"Hydro-acoustic optimization of propellers: A review of design methods","authors":"","doi":"10.1016/j.apor.2024.104158","DOIUrl":"10.1016/j.apor.2024.104158","url":null,"abstract":"<div><p>In recent years, the escalation of anthropogenic noise within marine environments has become a pressing ecological concern. Despite the proliferation of guidelines aimed at mitigating this issue, their adoption remains non-compulsory. The International Maritime Organization (IMO) advocates for noise reduction through the refinement of propeller design and heightened research to curtail acoustic emissions, ensuring that such measures do not compromise propulsive efficiency. This review delves into the array of strategies devised to attenuate noise pollution. It scrutinizes the methodologies employed to evaluate the hydroacoustic attributes of propellers, including experimental and computational approaches. Furthermore, it summarizes the techniques employed in the multiobjective optimization of propellers, which involves balancing the maximization of efficiency against the minimization of noise emission. The findings highlight the necessity for a comprehensive, interdisciplinary approach to the hydroacoustic optimization of marine propellers, encompassing cavitation experiments and advanced numerical simulations. In the field of propeller optimization, the traditional reliance on genetic algorithms is giving way to the adoption of neural networks and surrogate models derived from computational fluid dynamics data, particularly when addressing complex, nonlinear phenomena such as hydro-acoustics and cavitation.</p></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0141118724002797/pdfft?md5=8f39381f0067ccd99390f92df2dfbe55&pid=1-s2.0-S0141118724002797-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141997846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental investigation of flow and sediment transport on an equilibrium beach formed by surging breaker 涌浪断路器形成的平衡海滩上的水流和沉积物迁移实验研究

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-08-16 DOI: 10.1016/j.apor.2024.104180

{"title":"Experimental investigation of flow and sediment transport on an equilibrium beach formed by surging breaker","authors":"","doi":"10.1016/j.apor.2024.104180","DOIUrl":"10.1016/j.apor.2024.104180","url":null,"abstract":"<div><p>Flow patterns and sediment transport induced by breaking waves on a beach profile have been studied in a laboratory wave flume. Two parallel experiments were conducted on the same profiled rigid bed and sediment (mobile) bed, each subjected to identical wave forcing. The rigid bed experiments include measurements of bed shear stress and water-surface elevation, while the sediment bed experiments involve the measurement of pore-water pressures. The beach profile features a beach step leading to the generation of a hydraulic jump at the end of the rundown phase and accordingly forms a backwash vortex. The bed shear stress measurements revealed that the maximum onshore directed mean bed shear stress occurs after the wave breaking whereas the offshore directed one occurs during rundown at the same section. The increase of the bed shear stress with respect to that in the approaching wave boundary layer during the wave breaking and hydraulic jump processes can be by as much as a factor of 13 and 4, respectively. The effect of the wave breaking on turbulence is also more pronounced by a factor of 2.2 than the hydraulic jump in terms of r.m.s values of the fluctuating component of the bed shear stress. The pore pressure measurements showed that the vortex generated during the wave breaking creates an impulsive, upward-directed pressure gradient force that can be up to 1.2 times the submerged weight of the sediment. The sediment transport occurs in the sheet flow regime in a large part of the beach profile. The turbulence generated by the backwash vortex and the hydraulic jump at the beach step directly impacts the local sediment suspension which serves as the source for the advected sediment in the swash zone. The results are compared with a previous study that used the same methodology but involved plunging waves and the initial bed profile.</p></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-08-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141993395","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

Leveraging deep learning for coastal monitoring: A VGG16-based approach to spectral and textural classification of coastal areas with sentinel-2A data 利用深度学习进行海岸监测：利用哨兵-2A 数据对沿海地区进行光谱和纹理分类的基于 VGG16 的方法

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-08-14 DOI: 10.1016/j.apor.2024.104163

{"title":"Leveraging deep learning for coastal monitoring: A VGG16-based approach to spectral and textural classification of coastal areas with sentinel-2A data","authors":"","doi":"10.1016/j.apor.2024.104163","DOIUrl":"10.1016/j.apor.2024.104163","url":null,"abstract":"<div><p>Coastal ecosystems are vital for the planet's health, providing essential habitats for diverse species and supporting human communities. However, these complex environments face increasing threats from climate change and human activities. Effective monitoring of these areas requires large-scale, efficient, and accurate methods. This study explores the potential of deep learning for automated coastal land cover classification using Sentinel-2A satellite imagery on the Google Earth Engine (GEE) platform. We investigate the impact of transfer learning and spectral band combinations on classification accuracy for five coastal types: artificial, bedrock, sandy, muddy, and vegetation-covered. Our findings demonstrate that a pre-trained VGG16 Convolutional Neural Network (CNN) with transfer learning significantly improves classification accuracy (average 19.3% increase) compared to using default weights. Notably, including the near-infrared (NIR) band in training data leads to superior results, particularly for artificial and bedrock coastlines, where the NIR band's effectiveness in separating land-water boundaries enhances classification accuracy. These results highlight the potential of deep learning for large-scale, automated coastal monitoring, informing applications in sustainable fisheries management, coastal vulnerability assessment, and marine ecosystem conservation.</p></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141984680","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

On-bottom stability of a radial fin integrated surface-laid pipe-section against vertical penetration 径向鳍片集成表面铺设管道断面底部抗垂直渗透的稳定性

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-08-14 DOI: 10.1016/j.apor.2024.104165

{"title":"On-bottom stability of a radial fin integrated surface-laid pipe-section against vertical penetration","authors":"","doi":"10.1016/j.apor.2024.104165","DOIUrl":"10.1016/j.apor.2024.104165","url":null,"abstract":"<div><p>This study focuses on the on-bottom stability of surface-laid submarine pipelines during vertical penetration under thermal-induced buckling. Submarine pipelines are susceptible to buckling due to their high slenderness ratio, and the resistance to such displacement relies on pipeline stiffness and soil resistance. To investigate this, laboratory model tests were conducted using a scaled-down pipe section placed on a clay bed. The clay bed was prepared with remoulded Kaolin clay, ensuring uniform moisture content, and the model pipe was scaled down from a typical industry prototype. These tests were conducted in 2D plane strain conditions within a tank, equipped with observation windows to monitor pipe movement and soil behaviour. A significant improvement in the pipe section's penetration resistance and on-bottom stability was observed after incorporating fin in the pipe. The addition of fins altered the earth pressure distribution beneath the vertically loaded pipe, leading to a larger failure mechanism in the adjacent soil. Furthermore, the soil-surface-heaving progressed towards the tank wall with increasing angular distance between the radial fins. Thus, the research demonstrated the effectiveness of radial fins in enhancing the stability and resistance of submarine pipelines against vertical penetration, shedding light on potential improvements in submarine pipeline design and deployment.</p></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141990633","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

Viscous and nonlinear effects on Helmholtz resonance in a gap induced by waves 波诱导间隙亥姆霍兹共振的粘性和非线性效应

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-08-13 DOI: 10.1016/j.apor.2024.104161

{"title":"Viscous and nonlinear effects on Helmholtz resonance in a gap induced by waves","authors":"","doi":"10.1016/j.apor.2024.104161","DOIUrl":"10.1016/j.apor.2024.104161","url":null,"abstract":"<div><p>Viscous and nonlinear effects on the gap resonance between a deep-draft hull and a vertical wall are investigated numerically, with particular attention to the low-frequency response, i.e., Helmholtz resonance. Viscous-flow computations indicate that the free-surface response in the gap initially increases and then decreases as the hull draft-to-depth ratio varies from 0.4 to 0.98. Conditions in which there is near complete dissipation and minimal wave reflection (i.e., <em>K</em><sub><em>d</em></sub> = 0.99, <em>K<sub>r</sub></em> = 0.07) are identified and the effect of wave height is evaluated. Vorticity contours are used to study the flow field between the hull and boundaries. Significant flow blockage is shown to occur when the hull approaches the bottom boundary, attenuating the gap resonance. In this case, full development of these vortices and water transport into and out of the gap is restricted, leading to increased wave reflection. Numerical simulations for various incident wave heights demonstrate that the Helmholtz resonance still results in substantial wave dissipation (i.e., <em>K</em><sub><em>d</em></sub> > 0.89), which is in contrast to the behaviour observed for conventional gap problems. The findings may inform innovative designs for long wave absorbing breakwaters and Oscillating Water Column devices.</p></div>","PeriodicalId":8261,"journal":{"name":"Applied Ocean Research","volume":null,"pages":null},"PeriodicalIF":4.3,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141984679","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

Configuration design of a steel double lazy wave riser based on metamodel-assisted metaheuristic algorithms 基于元模型辅助元启发式算法的钢制双懒惰波浪立管配置设计

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-08-12 DOI: 10.1016/j.apor.2024.104159

引用次数: 0

The roles of individual force components on the capture mechanism of bubbles around a vortical flow 气泡在涡流周围的捕获机制中各个力的作用

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-08-12 DOI: 10.1016/j.apor.2024.104154

引用次数: 0

Self-management of ROV umbilical using sliding element: A general 3D-model 利用滑动元件对 ROV 脐带进行自我管理：通用三维模型

IF 4.3 2区工程技术

Applied Ocean Research Pub Date : 2024-08-11 DOI: 10.1016/j.apor.2024.104164

引用次数: 0