Gyde Andresen-Paulsen, R. U. F. von Bock und Polach, Matthias Donderer
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.
{"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}
The impact of breaking waves on an elastic vertical wall is investigated with a fully-coupled numerical model. The waves breaking on a 1:10 sloped bed is simulated with the computational fluid dynamics (CFD) approach with the stabilized k-ω model for turbulence closure. The deformations and stresses in the elastic vertical wall are investigated with the computational solid mechanics (CSM) approach. The CFD and CSM approaches are fully-coupled in the finite-volume-method-based OpenFOAM framework. The present approach is verified against an existing study of the interaction between non-breaking solitary waves and an elastic vertical wall. Good agreement is obtained. Then the breaking waves are simulated and their interaction with the elastic vertical wall is investigated. It is found that breaking waves can cause strong deformation and vibration of the elastic seawall. The oscillation frequency of the seawall is four times the wave frequency.
{"title":"Hydroelastic Simulation of Breaking Wave Impact on a Flexible Coastal Seawall","authors":"Yuzhu Li, Zhengyun Hu, Luofeng Huang","doi":"10.1115/omae2022-79099","DOIUrl":"https://doi.org/10.1115/omae2022-79099","url":null,"abstract":"\u0000 The impact of breaking waves on an elastic vertical wall is investigated with a fully-coupled numerical model. The waves breaking on a 1:10 sloped bed is simulated with the computational fluid dynamics (CFD) approach with the stabilized k-ω model for turbulence closure. The deformations and stresses in the elastic vertical wall are investigated with the computational solid mechanics (CSM) approach. The CFD and CSM approaches are fully-coupled in the finite-volume-method-based OpenFOAM framework. The present approach is verified against an existing study of the interaction between non-breaking solitary waves and an elastic vertical wall. Good agreement is obtained. Then the breaking waves are simulated and their interaction with the elastic vertical wall is investigated. It is found that breaking waves can cause strong deformation and vibration of the elastic seawall. The oscillation frequency of the seawall is four times the wave frequency.","PeriodicalId":408227,"journal":{"name":"Volume 5A: Ocean Engineering","volume":"144 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":"122909757","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}
While landing Wing-in Ground Effect (WIG) craft are exposed to large hydrodynamic forces which can lead to structural damages. Sea loads can be predicted by solving the free surface problem, known as water entry. The problem has been studied for rigid bodies until most recently, when researchers hypothesized that the structural response of the body can also influence the hydrodynamic pressures. This paper aims to provide deeper understanding of the impact loads during the water entry process of a hard chine section for the case of a common WIG Craft section. A Finite Volume Method (FVM) based computational fluid-structure interaction model is used to solve multi-physics and quantitative comparisons are made between experimental and computational data. Simulations demonstrate that structural dynamics can attenuate the pressure acting on body walls. The deadrise angle, speed in way of water entry and rigidity of the solid body are shown to affect the dynamic response with equivalent stresses maximized and then decaying over time near the chine.
{"title":"The Hydrodynamics of Hard-Chine Sections Entering Water","authors":"S. Tavakoli, A. Babanin, S. Hirdaris","doi":"10.1115/omae2022-80598","DOIUrl":"https://doi.org/10.1115/omae2022-80598","url":null,"abstract":"\u0000 While landing Wing-in Ground Effect (WIG) craft are exposed to large hydrodynamic forces which can lead to structural damages. Sea loads can be predicted by solving the free surface problem, known as water entry. The problem has been studied for rigid bodies until most recently, when researchers hypothesized that the structural response of the body can also influence the hydrodynamic pressures. This paper aims to provide deeper understanding of the impact loads during the water entry process of a hard chine section for the case of a common WIG Craft section. A Finite Volume Method (FVM) based computational fluid-structure interaction model is used to solve multi-physics and quantitative comparisons are made between experimental and computational data. Simulations demonstrate that structural dynamics can attenuate the pressure acting on body walls. The deadrise angle, speed in way of water entry and rigidity of the solid body are shown to affect the dynamic response with equivalent stresses maximized and then decaying over time near the chine.","PeriodicalId":408227,"journal":{"name":"Volume 5A: Ocean Engineering","volume":"48 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":"129338579","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}
L.A. Schiaveto Neto, P. Rosman, Eduardo Aoun Tannuri
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. 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. 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. 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.
{"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}
Structures installed in very shallow water are experiencing forces from a very disturbed flow field, including rapidly changing gradients and breaking waves. Estimating loads on these structures usually involves running full 3D CFD analyses to predict the flow field and calculate the forces. This paper is comparing a full 3D CFD simulation using OpenFOAM to a novel method of wave propagation with a multilayer solver based on Basilisk in order to establish the applicability of such a method in estimating loads on structures in shallow water. By applying the multilayer method the analysis time is reduced so much that one can estimate kinematics with a statistical approach where one analyses a wide range of sea states to estimate loading on the structure. This approach is common in deep water where much of the kinematics are simplified.
{"title":"Analysis of Structures in Very Shallow Water: CFD Analysis of Wave Propagation and Breaking Waves","authors":"Magnus Johannesen, Øystein Lande","doi":"10.1115/omae2022-80770","DOIUrl":"https://doi.org/10.1115/omae2022-80770","url":null,"abstract":"\u0000 Structures installed in very shallow water are experiencing forces from a very disturbed flow field, including rapidly changing gradients and breaking waves. Estimating loads on these structures usually involves running full 3D CFD analyses to predict the flow field and calculate the forces.\u0000 This paper is comparing a full 3D CFD simulation using OpenFOAM to a novel method of wave propagation with a multilayer solver based on Basilisk in order to establish the applicability of such a method in estimating loads on structures in shallow water. By applying the multilayer method the analysis time is reduced so much that one can estimate kinematics with a statistical approach where one analyses a wide range of sea states to estimate loading on the structure. This approach is common in deep water where much of the kinematics are simplified.","PeriodicalId":408227,"journal":{"name":"Volume 5A: Ocean Engineering","volume":"3 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":"125973395","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}
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.
{"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}
N. Ventikos, L. Perera, P. Sotiralis, Emmanouil Annetis, Eirini V. Stamatopoulou
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.
{"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}
Floating wind turbine technologies have worldwide applications. Regarding the wind turbine floater stability, there are three principal design philosophies: ballast-, buoyancy- and mooring-stabilized. Although linear hydrostatic stiffness coefficient has been applied in most hydro-aero-elastic codes, accurate calculation of the nonlinear hydrostatic restoring forces is important for the floating stability evaluation and load. This study selects a 5-megawatt spar floating wind turbine as a representative floater. The nonlinear hydrostatic stiffness coefficient for different heeling angles is analytically calculated and compared against those obtained by a hydrodynamic software, and an excellent match is shown. A sensitivity study is carried out to consider the uncertainties in the hydrostatic stiffness due to varying geometry and weight distribution. The present results can be applied in the time-domain simulations for floating wind turbines.
{"title":"Nonlinear Hydrostatic Restoring Characteristics of a Spar Floating Wind Turbine","authors":"Zhengyang Pang, Aichun Feng, Zhiyu Jiang, Amrit Shankar Verma, Ke Chen","doi":"10.1115/omae2022-78799","DOIUrl":"https://doi.org/10.1115/omae2022-78799","url":null,"abstract":"\u0000 Floating wind turbine technologies have worldwide applications. Regarding the wind turbine floater stability, there are three principal design philosophies: ballast-, buoyancy- and mooring-stabilized. Although linear hydrostatic stiffness coefficient has been applied in most hydro-aero-elastic codes, accurate calculation of the nonlinear hydrostatic restoring forces is important for the floating stability evaluation and load. This study selects a 5-megawatt spar floating wind turbine as a representative floater. The nonlinear hydrostatic stiffness coefficient for different heeling angles is analytically calculated and compared against those obtained by a hydrodynamic software, and an excellent match is shown. A sensitivity study is carried out to consider the uncertainties in the hydrostatic stiffness due to varying geometry and weight distribution. The present results can be applied in the time-domain simulations for floating wind turbines.","PeriodicalId":408227,"journal":{"name":"Volume 5A: Ocean Engineering","volume":"2 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":"117075006","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}
The study numerically investigates the three-dimensional (3D) flow features around a mono-pile with scour protection under steady flow condition. A hydrodynamic model based on Volume-averaged Reynolds-averaged Navier-Stokes (VARANS) equations with the Volume-averaged k-ω turbulence closure is developed, which is implemented in OpenFOAM. The numerical model is firstly verified against experiments and known analytical/empirical expressions by simulating simple turbulent flows. Under the steady current, a 3D model using a parabolic transition near the interface is validated against experimental measurements regarding the flow features both inside and outside of the scour protection around a mono-pile. The computed results are reasonably in line with the experiments. The simulations demonstrate the ability of the developed model to evaluate the flow behaviors in scour protection.
{"title":"Numerical Investigation of Flow in Porous Media Around a Mono-Pile Under Steady Current","authors":"Yanyan Zhai, E. D. Christensen","doi":"10.1115/omae2022-79002","DOIUrl":"https://doi.org/10.1115/omae2022-79002","url":null,"abstract":"\u0000 The study numerically investigates the three-dimensional (3D) flow features around a mono-pile with scour protection under steady flow condition. A hydrodynamic model based on Volume-averaged Reynolds-averaged Navier-Stokes (VARANS) equations with the Volume-averaged k-ω turbulence closure is developed, which is implemented in OpenFOAM. The numerical model is firstly verified against experiments and known analytical/empirical expressions by simulating simple turbulent flows. Under the steady current, a 3D model using a parabolic transition near the interface is validated against experimental measurements regarding the flow features both inside and outside of the scour protection around a mono-pile. The computed results are reasonably in line with the experiments. The simulations demonstrate the ability of the developed model to evaluate the flow behaviors in scour protection.","PeriodicalId":408227,"journal":{"name":"Volume 5A: Ocean Engineering","volume":"28 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":"121053973","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}
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. 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.
{"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}
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