Journal of Ocean Engineering and Science最新文献_第7页

Numerical investigation into water entry problems of a flat plate with air pockets 带气穴平板入水问题的数值研究

IF 7.1 1区工程技术

Journal of Ocean Engineering and Science Pub Date : 2023-08-01 DOI: 10.1016/j.joes.2022.04.011

Casey O'Connor, Saeed Mohajernasab, Nagi Abdussamie

{"title":"Numerical investigation into water entry problems of a flat plate with air pockets","authors":"Casey O'Connor, Saeed Mohajernasab, Nagi Abdussamie","doi":"10.1016/j.joes.2022.04.011","DOIUrl":"10.1016/j.joes.2022.04.011","url":null,"abstract":"<div><p>Computational Fluid Dynamics (CFD) investigations into water entry problems of a rigid flat plate with air pockets were systematically conducted. The Volume of Fluid (VOF) model was utilised to capture localised slamming phenomena that occur during, and post-impact events. The model's geometry was modified to include a pocket on the slamming impact surface to investigate the effect of air entrapment on the magnitude and distribution of slamming forces and pressures. A parametric study was conducted on the geometric parameters of the modelled pocket by altering its area, depth, and volume to examine the response of slamming force and pressure loading under several impact velocities. The numerical results of slamming forces and pressures were in good agreement with experimental drop test measurements (with relative error of -6% and 7% for the magnitude of slamming force and pressure, respectively). The numerical results proved that the peak pressure is proportional to the magnitude of impact velocity squared (<span><math><mrow><msub><mi>p</mi><mrow><mi>m</mi><mi>a</mi><mi>x</mi></mrow></msub><mo>∝</mo><msup><mi>v</mi><mn>2</mn></msup></mrow></math></span>).</p></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"8 4","pages":"Pages 386-400"},"PeriodicalIF":7.1,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45276042","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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: 5

Numerical analysis method of ship-ice collision-induced vibration of the polar transport vessel based on the full coupling of ship-ice-water-air 基于船-冰-水-气全耦合的极地运输船船冰碰撞诱发振动数值分析方法

IF 7.1 1区工程技术

Journal of Ocean Engineering and Science Pub Date : 2023-08-01 DOI: 10.1016/j.joes.2023.04.002

Yuan-He Shi , De-Qing Yang , Wen-Wei Wu

{"title":"Numerical analysis method of ship-ice collision-induced vibration of the polar transport vessel based on the full coupling of ship-ice-water-air","authors":"Yuan-He Shi , De-Qing Yang , Wen-Wei Wu","doi":"10.1016/j.joes.2023.04.002","DOIUrl":"10.1016/j.joes.2023.04.002","url":null,"abstract":"<div><p>As the Arctic Channel continues to be developed, collisions between polar navigation vessels and sea ice are inevitable, which will directly affect structural safety and vibration comfort. However, the numerical analysis method of ship–ice collision-induced vibration is not perfect, and the effect of fluid coupling is not typically considered. In this paper, a simplified numerical analysis method for ship–ice collision-induced vibration is proposed, in which a reliable ice load is obtained by first performing ship–ice–water–air coupled collision calculations, followed by ship–ice–water coupled vibration calculations to obtain the vibration response of the structure. In addition, this paper investigates the full coupling method and the modeling ranges and meshing sizes involved in the analysis ship–ice collision-induced vibration, and the computational efficiencies of the traditional ALE algorithm and S-ALE algorithm are compared. The results indicate that the simplified simulation analysis method and gradient meshing model improve the calculation accuracy and efficiency in ship-ice collision and vibration response analysis. Moreover, the modeling range of the water and air models cannot be less than 6 times the ship width, 2 times the ship length, and 1 times the ship depth, and the S-ALE algorithm saves 47.86% time compared to the ALE algorithm. The research results in this paper can provide a reference for the numerical simulation of ship–ice collision-induced vibration.</p></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"8 4","pages":"Pages 323-335"},"PeriodicalIF":7.1,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41558026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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 useful guide of effective mesh-size decision in predicting the ultimate strength of flat- and curved plates in compression 在预测扁板和弯板的压缩极限强度时，有效确定网格尺寸的有用指南

IF 7.1 1区工程技术

Journal of Ocean Engineering and Science Pub Date : 2023-08-01 DOI: 10.1016/j.joes.2022.02.014

Do Kyun Kim , Imjun Ban , Bee Yee Poh , Sung-Chul Shin

{"title":"A useful guide of effective mesh-size decision in predicting the ultimate strength of flat- and curved plates in compression","authors":"Do Kyun Kim , Imjun Ban , Bee Yee Poh , Sung-Chul Shin","doi":"10.1016/j.joes.2022.02.014","DOIUrl":"10.1016/j.joes.2022.02.014","url":null,"abstract":"<div><p>The present study aims to determine the appropriate size of mesh or the number of the element (NoE) for flat- and curved plates, which is suggested to assess its safety subjected to axial compression based on the ultimate limit state (ULS) design and analysis concept. The unstiffened panel (= plate) and stiffened panel, considered primary members of ships and ship-shaped offshore structures, are subjected to repeated axial compression and tension caused by continued vertical bending moments applied to the hull girder. Plates are attached with stiffeners by welding, and 6, 8 or 10 elements are generally recommended to allocate in flat-plate's breadth direction in between stiffeners for finite-element (FE) modelling, which enables the presentation of the shape of initial deflection applied to the plate. In the case of the load-shorting curve for curved plate, it is reported that the nonlinear behaviour characteristics, i.e., snap-through, snap-back, secondary buckling and others, appear in typical flank angle. To take this into account, we investigated the preferred number of elements (6, 8 or 10) generally applied to the flat plate whether it is an appropriate or more fine-sized element (or mesh) that should be considered. A useful guide is documented based on obtained outcomes which may help structural engineers select optimised mesh-size to predict ultimate strength and understand its characteristic of the flat and curved plates.</p></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"8 4","pages":"Pages 401-417"},"PeriodicalIF":7.1,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48315019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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: 3

Experimental hydrodynamic assessment of a cylindrical-type floating solar system exposed to waves 波浪作用下圆柱形漂浮太阳系的实验流体动力学评估

IF 7.1 1区工程技术

Journal of Ocean Engineering and Science Pub Date : 2023-08-01 DOI: 10.1016/j.joes.2023.08.004

Dallán Friel , Madjid Karimirad , Trevor Whittaker , John Doran

{"title":"Experimental hydrodynamic assessment of a cylindrical-type floating solar system exposed to waves","authors":"Dallán Friel , Madjid Karimirad , Trevor Whittaker , John Doran","doi":"10.1016/j.joes.2023.08.004","DOIUrl":"https://doi.org/10.1016/j.joes.2023.08.004","url":null,"abstract":"<div><p>In this paper, an experimental investigation on the wave loads and structural motions of two semi-fixed semi-immersed horizontal cylinders type rafts in the free surface zone is conducted. The physical models are tested at the 1:4.5 scale and exposed to a range of regular and irregular waves in a wave flume at Queen's University Belfast. The physical models and experimental setup are discussed alongside an investigation of the hydrodynamic phenomena, surge forces, and dynamic responses that each structure exhibits in the coastal wave climates. Furthermore, an investigation into the wave attenuation by both models is carried out. The results show that the surge forces have a positive correlation with wave steepness for both models. Hydrodynamic phenomena such as wave runup and overtopping, radiative damping and reflected waves, constructive interference, diffraction and flow separation were identified during the experiments. A negative mean heave displacement is observed during the monochromatic sea states which could result in impact loading and submergence of the superstructure components and photovoltaic panels at full-scale. The results presented in this paper may be used to calibrate and verify numerical models that calculate the global responses and hydrodynamic forces. It may also benefit the design processes of geometrically similar floating solar technologies by providing data on surge loads, motion responses and hydrodynamic observations.</p></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"8 4","pages":"Pages 461-473"},"PeriodicalIF":7.1,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50176849","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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

Cross-sectional mechanical characteristics and sensitivity analysis of unbonded flexible risers under axial loads 轴向载荷作用下无粘结柔性立管的截面力学特性及灵敏度分析

IF 7.1 1区工程技术

Journal of Ocean Engineering and Science Pub Date : 2023-08-01 DOI: 10.1016/j.joes.2023.08.005

Xiansheng Zhang, Weiping Huang, Weilin Ma, Su Lei, Tian Haoyu, Yongchun Yang

引用次数: 0

Hydroelasticity analysis of a vessel-shaped fish cage under incident, diffraction and radiation wave fields 船形网箱在入射、衍射和辐射波场作用下的水弹性分析

IF 7.1 1区工程技术

Journal of Ocean Engineering and Science Pub Date : 2023-08-01 DOI: 10.1016/j.joes.2023.05.001

Yihou Wang , Shixiao Fu , Torgeir Moan , Yuwang Xu , Tianhu Cheng

{"title":"Hydroelasticity analysis of a vessel-shaped fish cage under incident, diffraction and radiation wave fields","authors":"Yihou Wang , Shixiao Fu , Torgeir Moan , Yuwang Xu , Tianhu Cheng","doi":"10.1016/j.joes.2023.05.001","DOIUrl":"10.1016/j.joes.2023.05.001","url":null,"abstract":"<div><p>Vessel-shaped fish cages are promising large aquaculture structures developed in recent years, with an overall length of nearly 400 m. In this paper, a coupled hydroelasticity model of a vessel-shaped fish cage is used to calculate the motion and structural response in the time domain. First, the floating body of the cage is discretized into a multimodule system to calculate the frequency-domain hydrodynamic loads. Then, the multimodule system is connected by equivalent elastic beams to consider the hydroelastic behavior in the time domain. The hydrodynamic loads of the multimodule system are transformed from the frequency-domain loads. Moreover, based on the velocity field transfer functions and the motion of the multimodule system, coupling wave fields considering incident, diffraction and radiation waves are built and used to calculate the loads on the net and steel frame. By iterating the motion response of the multimodule system and the hydrodynamic loads on the net and steel frame in the time domain, the balanced hydroelasticity response of the whole cage is finally obtained. The results show that the hydroelasticity effects have a significant influence on the vertical displacement and cross-sectional load effects of the vessel-shaped fish cage.</p></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"8 4","pages":"Pages 418-434"},"PeriodicalIF":7.1,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44341939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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: 2

Large eddy simulation of plunging solitary wave: understanding the breaking and turbulent mechanisms along shoaling region 骤降孤立波的大涡模拟：对浅水区破碎和湍流机制的理解

IF 7.1 1区工程技术

Journal of Ocean Engineering and Science Pub Date : 2023-08-01 DOI: 10.1016/j.joes.2023.07.008

Abbas Rahmani, A. Keramat, Jinghua Wang, H. Duan

引用次数: 0

A machine learning model for fast approximation of free-surface Green's function and its application 自由曲面格林函数快速逼近的机器学习模型及其应用

IF 7.1 1区工程技术

Journal of Ocean Engineering and Science Pub Date : 2023-08-01 DOI: 10.1016/j.joes.2023.08.002

Ke Zhan, R. Zhu, Dekang Xu

引用次数: 0

Numerical simulation of violent interactions between dam break flow and a floating box using a modified MPS method 用改进的MPS方法数值模拟溃坝流与浮箱的剧烈相互作用

IF 7.1 1区工程技术

Journal of Ocean Engineering and Science Pub Date : 2023-08-01 DOI: 10.1016/j.joes.2023.08.003

Date Li, Huaixin Zhang, Guangfei Qin

引用次数: 0

Time-domain floater stress analysis for a floating wind turbine 浮式风力发电机浮子应力时域分析

IF 7.1 1区工程技术

Journal of Ocean Engineering and Science Pub Date : 2023-08-01 DOI: 10.1016/j.joes.2023.08.001

Zhen Gao , Daniel Merino , Kai-Jia Han , Haoran Li , Stian Fiskvik

{"title":"Time-domain floater stress analysis for a floating wind turbine","authors":"Zhen Gao , Daniel Merino , Kai-Jia Han , Haoran Li , Stian Fiskvik","doi":"10.1016/j.joes.2023.08.001","DOIUrl":"10.1016/j.joes.2023.08.001","url":null,"abstract":"<div><p>There are increasing focuses on developing cost-effective floating wind turbines, for which efficient stress analysis methods are needed for floater structural design. Most of the today's studies focus on global analysis methods in which the floater is assumed as a rigid body or multiple rigid bodies and the stress distributions in the floater cannot be directly obtained. As part of the COWI Fonden funded EMULF project, a summary about the methodology, the numerical modeling procedure and the verification for stress response analysis of a semi-submersible floater for a 15MW wind turbine is presented. This analysis procedure includes the regeneration of the hydrodynamic pressure loads on the external wet surface of the floater due to wave diffraction, radiation and hydrostatic pressure change, and the application of these pressure loads, together with the time-varying gravity due motions, the inertial loads and the forces/moments at the boundaries (i.e. tower bottom and mooring line fairleads) of the floater to obtain the deformation and the stresses of the floater in the time domain. The analysis procedure is implemented in a developed MATLAB code and the DNV software package. The importance of the different hydrodynamic pressure components was discussed considering representative sea states. A verification of the obtained stress time series and statistics using this method against the regeneration from a linear frequency-domain approach was made considering irregular wave actions only, and a very good agreement was obtained. The developed methodology can provide an efficient solution for structural design analysis of floating wind turbines.</p></div>","PeriodicalId":48514,"journal":{"name":"Journal of Ocean Engineering and Science","volume":"8 4","pages":"Pages 435-445"},"PeriodicalIF":7.1,"publicationDate":"2023-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41437049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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: 3