Volume 5A: Ocean Engineering最新文献

A Comparison of Finite Element Computations and an Analytical Approach for Determining Hull-Induced Underwater-Radiated Noise 计算船体水下辐射噪声的有限元方法与解析方法的比较

Volume 5A: Ocean Engineering Pub Date : 2022-06-05 DOI: 10.1115/omae2022-78674

Gyde Andresen-Paulsen, R. U. F. von Bock und Polach, Matthias Donderer

{"title":"A Comparison of Finite Element Computations and an Analytical Approach for Determining Hull-Induced Underwater-Radiated Noise","authors":"Gyde Andresen-Paulsen, R. U. F. von Bock und Polach, Matthias Donderer","doi":"10.1115/omae2022-78674","DOIUrl":"https://doi.org/10.1115/omae2022-78674","url":null,"abstract":"Underwater-radiated noise (URN) of shipping significantly affects marine wildlife and can be a substantial but unwanted signature. Structure- and air-borne noise induced by motions of the main engine lead to a vibrating ship hull that radiates underwater sound. However, until today it is not yet fully understood which structural parameters influence the hull-induced underwater noise radiation, and to what extent. Acoustic tests suffer from long lead times and require high effort, i.e., cost-intensive measuring systems and high personnel costs for setting up and conducting measurements, filtering out background noises, etc. Additionally, they are not well-suited for systematic studies, e.g., for varying geometry parameters. Numerical simulations can serve as a cost-efficient and versatile alternative but their validation is impeded by a lack of available and suitable experimental data. Here, a first step is presented towards validated numerical simulations for investigating the impact of each structural parameter as well as their coupling to URN. Finite element simulations are conducted comparing results with an analytical solution for underwater sound radiation of an infinite plate. The simulations show a good agreement with the analytical solution. Nonetheless, the degree of agreement between the two approaches depends significantly on the boundary conditions as well as on the setup of the numerical model. The analytical solution is valid for an infinite plate and an unconfined fluid domain, by setting boundary conditions in a numerical model these assumptions can be included. Based on the validated numerical model of an infinite plate, a bottom-up approach can be applied, for further investigations of various parameters of more complex structures regarding their influence on URN.","PeriodicalId":408227,"journal":{"name":"Volume 5A: Ocean Engineering","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126942450","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hydroelastic Simulation of Breaking Wave Impact on a Flexible Coastal Seawall 破碎波冲击柔性海堤的水弹性模拟

Volume 5A: Ocean Engineering Pub Date : 2022-06-05 DOI: 10.1115/omae2022-79099

Yuzhu Li, Zhengyun Hu, Luofeng Huang

引用次数: 1

The Hydrodynamics of Hard-Chine Sections Entering Water 硬质合金断面入水的流体力学

Volume 5A: Ocean Engineering Pub Date : 2022-06-05 DOI: 10.1115/omae2022-80598

S. Tavakoli, A. Babanin, S. Hirdaris

引用次数: 0

Shallow Water Equations With Semi-Submerged Structures Solving a Poisson Equation for the Pressure on the Structure Surface 半淹没结构的浅水方程求解结构表面压力的泊松方程

Volume 5A: Ocean Engineering Pub Date : 2022-06-05 DOI: 10.1115/omae2022-79603

L.A. Schiaveto Neto, P. Rosman, Eduardo Aoun Tannuri

{"title":"Shallow Water Equations With Semi-Submerged Structures Solving a Poisson Equation for the Pressure on the Structure Surface","authors":"L.A. Schiaveto Neto, P. Rosman, Eduardo Aoun Tannuri","doi":"10.1115/omae2022-79603","DOIUrl":"https://doi.org/10.1115/omae2022-79603","url":null,"abstract":"\u0000 Interaction between currents and semi-submerged structures in coastal areas is a problem of interest in naval and ocean engineering. CFD commercial codes capable of solving these problems have the drawbacks of the high cost of computational resources and time, making them unsuitable for real-time applications in ship maneuvering simulators.\u0000 This work presents a mathematical model that includes semi-submerged structures in the shallow water equations with hydrostatic assumption. The inclusion of a semi-submerged structure implies the addition of a subdomain with no free surface, replaced by the structure surface. The elevation unknown is replaced by the pressure on the structure surface, which is also unknown. Within this subdomain (for the parcel of fluid under the semi-submerged structure), the 2D-integrated continuity equation is replaced by a Poisson-type equation for the pressure on the structure.\u0000 This new model is implemented computationally using the finite element method for spatial discretization, and second order schemes for temporal discretization. The results show promising optimization of calculation time per time step, which can lead to the feasibility of real-time applications of hydrodynamic models in ship maneuvering simulators, for example.\u0000 The numerical results are compared to simulations performed with a CFD commercial code. It shows fairly good agreement in the current magnitude calculations. The elevation and structure surface results are more discrepant, albeit physically realistic. The analysis of CFD results allows concluding that the inclusion of a 3D module and dynamic pressure estimations may improve the results.","PeriodicalId":408227,"journal":{"name":"Volume 5A: Ocean Engineering","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124418693","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Analysis of Structures in Very Shallow Water: CFD Analysis of Wave Propagation and Breaking Waves 浅水结构分析:波浪传播和破波的CFD分析

Volume 5A: Ocean Engineering Pub Date : 2022-06-05 DOI: 10.1115/omae2022-80770

Magnus Johannesen, Øystein Lande

引用次数: 0

On the Effect of Free-Surface Linearization on the Predicted Hydrodynamic Response of Underwater Vehicles Travelling Near the Free-Surface 自由水面线性化对靠近自由水面航行的水下航行器预测水动力响应的影响

Volume 5A: Ocean Engineering Pub Date : 2022-06-05 DOI: 10.1115/omae2022-80485

W. Lambert, S. Brizzolara, C. Woolsey

{"title":"On the Effect of Free-Surface Linearization on the Predicted Hydrodynamic Response of Underwater Vehicles Travelling Near the Free-Surface","authors":"W. Lambert, S. Brizzolara, C. Woolsey","doi":"10.1115/omae2022-80485","DOIUrl":"https://doi.org/10.1115/omae2022-80485","url":null,"abstract":"\u0000 This study presents a comparison of the hydrodynamic responses generated by a boundary element method with linear free-surface boundary conditions and a volume of fluid RANSE CFD method with nonlinear surface capturing for a shallowly submerged prolate spheroid travelling with constant forward velocity. Observing the effects of free-surface proximity and forward velocity on the hydrodynamic forces and wave disturbance between the two numerical methods reveals the influence and importance of considering a nonlinear free-surface. The forces and moments acting on the spheroid using the nonlinear method are generally larger than the linear method showing that nonlinear effects are important in the calculation of wave making resistance. The difference between the linear and nonlinear methods grows as submergence decreases or wave making increases. An additional phenomenon is shown where the difference between the methods displays a trend with respect to Froude number and depth that is similar to the values being compared. The physical response of these nonlinear effects is seen in the steepening of surface waves near the body, which breaks some of the assumptions made in the linear boundary element method.","PeriodicalId":408227,"journal":{"name":"Volume 5A: Ocean Engineering","volume":"72 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116247445","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

A Life-Cycle Cost Framework for Onboard Emission Reduction Technologies: The Case of the Flapping-Foil Thruster Propulsion Innovation 机载减排技术的全寿命周期成本框架:以扑翼型推力器推进创新为例

Volume 5A: Ocean Engineering Pub Date : 2022-06-05 DOI: 10.1115/omae2022-79031

N. Ventikos, L. Perera, P. Sotiralis, Emmanouil Annetis, Eirini V. Stamatopoulou

{"title":"A Life-Cycle Cost Framework for Onboard Emission Reduction Technologies: The Case of the Flapping-Foil Thruster Propulsion Innovation","authors":"N. Ventikos, L. Perera, P. Sotiralis, Emmanouil Annetis, Eirini V. Stamatopoulou","doi":"10.1115/omae2022-79031","DOIUrl":"https://doi.org/10.1115/omae2022-79031","url":null,"abstract":"\u0000 To deal with the decarbonization challenge in an efficient way in terms of cost-effectiveness, reliability and feasibility for newbuilding and retrofit solutions in maritime industry, Seatech H2020 project develops a flapping-foil thruster propulsion innovation, together with a dual-fuel engine innovation to increase fuel efficiency and reduce emissions. The focus of this study is on the foil thruster, which is arranged at the bow and slightly in front of the ship, and it utilises the energy from wave-induced motions by converting it into thrust. For such innovations, a clear picture of its economic impacts facilitates their adoption. Thus, to deal with the economic aspects, from a life cycle perspective, the paper introduces a life-cycle cost analysis (LCCA) framework, which includes all four phases of the system’s life cycle; construction, operation, maintenance and end-of-life. In the context of the developed framework, the initial challenge for the LCCA exercise is to fully define the design details of the system, which will facilitate the cost approximation, mainly for construction, maintenance and end-of-life phases. The results from the materialisation of the LCCA provide significant insight with respect to the lifecycle costs and may support the decision-making process for newbuilding and retrofitting investments.","PeriodicalId":408227,"journal":{"name":"Volume 5A: Ocean Engineering","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128651190","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Nonlinear Hydrostatic Restoring Characteristics of a Spar Floating Wind Turbine 浮式风力机非线性静水恢复特性研究

Volume 5A: Ocean Engineering Pub Date : 2022-06-05 DOI: 10.1115/omae2022-78799

Zhengyang Pang, Aichun Feng, Zhiyu Jiang, Amrit Shankar Verma, Ke Chen

引用次数: 0

Numerical Investigation of Flow in Porous Media Around a Mono-Pile Under Steady Current 恒流作用下单桩周围多孔介质流动的数值研究

Volume 5A: Ocean Engineering Pub Date : 2022-06-05 DOI: 10.1115/omae2022-79002

Yanyan Zhai, E. D. Christensen

引用次数: 0

The Comparison of Two Kinematic Motion Models for Autonomous Shipping Maneuvers 船舶自主机动两种运动模型的比较

Volume 5A: Ocean Engineering Pub Date : 2022-06-05 DOI: 10.1115/omae2022-79583

Yufei Wang, L. Perera, B. Batalden

{"title":"The Comparison of Two Kinematic Motion Models for Autonomous Shipping Maneuvers","authors":"Yufei Wang, L. Perera, B. Batalden","doi":"10.1115/omae2022-79583","DOIUrl":"https://doi.org/10.1115/omae2022-79583","url":null,"abstract":"\u0000 Autonomous shipping with adequate decision support systems is widely considered as a high-potential development direction in the maritime industry in the upcoming years. Prediction technologies are one of the key components in these decision support systems and they usually require a large number of data sets to estimate vessel states. Certain vessel motion models are generally implemented with the above-mentioned prediction technologies to improve the accuracy and robustness of the estimated states. In contrast to wider research studies of different motion models for the applications of ground vehicles, the studies of appropriate motion models for maritime transport applications are still insufficient. Therefore, it is necessary to develop reliable motion models for vessels, and that can improve the decision supporting capabilities in future vessels, especially in autonomous shipping.\u0000 In this paper, two kinematic motion models which can be used to estimate various vessel maneuvering states are examined and compared. In the current stage, the proposed models are used to investigate ship maneuvers produced by a ship bridge simulator. Two nonlinear filter algorithms combined with Monte Carlo-based simulation tests are applied to estimate the respective vessel states. In the conclusion, a comprehensive comparison of the estimation algorithms is presented with the estimated vessel states. Hence, this study provides robust and convenient estimation algorithms that can support autonomous shipping navigation in the future.","PeriodicalId":408227,"journal":{"name":"Volume 5A: Ocean Engineering","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129213538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0