Volume 5A: Ocean Engineering最新文献_第4页

Preliminary Study of Floating Offshore Wind Turbines Motions Using the Smoothed Particle Hydrodynamics Method 基于光滑质点流体力学方法的海上浮式风力机运动初步研究

Volume 5A: Ocean Engineering Pub Date : 2022-06-05 DOI: 10.1115/omae2022-78419

B. Tagliafierro, M. Karimirad, I. Martínez-Estévez, J. Dominguez, A. Crespo, M. Gómez-Gesteira, G. Viccione

{"title":"Preliminary Study of Floating Offshore Wind Turbines Motions Using the Smoothed Particle Hydrodynamics Method","authors":"B. Tagliafierro, M. Karimirad, I. Martínez-Estévez, J. Dominguez, A. Crespo, M. Gómez-Gesteira, G. Viccione","doi":"10.1115/omae2022-78419","DOIUrl":"https://doi.org/10.1115/omae2022-78419","url":null,"abstract":"\u0000 The open-source code DualSPHysics, based on the Smoothed Particle Hydrodynamics (SPH) method for solving fluid mechanics problems, defines a complete numerical environment for simulating the interaction of floating structures with waves and currents, and includes external libraries to simulate kinematic- and dynamic-type restrictions. In this work, we propose a full validation of the presented SPH framework using validation data available for an experimental test campaign on a 1:37th-scale FOWT TLP. The first set of validation cases includes a surge decay test, to assess the quality of the fluid-solid interaction, and regular wave tests, which stimulate the mooring system to a large extent. During this phase, tendons (tension legs) that are simulated by MoorDyn+ are validated. Secondly, the numerical model has proven to predict with a high degree of accuracy the response of the investigated TLP under regular waves. Spectral comparison shows that the model is able to capture the surge and pitch dynamic amplification that occurs around the resonant fundamental mode of vibration.","PeriodicalId":408227,"journal":{"name":"Volume 5A: Ocean Engineering","volume":"46 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":"130865902","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

Computational Study on the Transmission of COVID-19 Virus Inside a Ship 新型冠状病毒在船舶内传播的计算研究

Volume 5A: Ocean Engineering Pub Date : 2022-06-05 DOI: 10.1115/omae2022-80182

Luofeng Huang, Seogeng Riyadi, I. Utama, Giles Thomas

{"title":"Computational Study on the Transmission of COVID-19 Virus Inside a Ship","authors":"Luofeng Huang, Seogeng Riyadi, I. Utama, Giles Thomas","doi":"10.1115/omae2022-80182","DOIUrl":"https://doi.org/10.1115/omae2022-80182","url":null,"abstract":"\u0000 To investigate the operational improvements of vessels under the impact of COVID-19, this work has developed a Computational Fluid Dynamics model combined with Lagrangian particles to study the airborne transmission of COVID-19 viruses inside a ship. Initially a generic model was established to enable validation against experimental results for the diffusion of flu virus in an idealised room. Following this, the room geometry was replaced by the superstructure of a full-scale crew boat. Considering the boat advancing in open water, simulations were conducted to study the particulate flow due to a person coughing and speaking, with the boat’s forward door open and closed. The results have shown that, when the forward door is open, a significant airflow can carry the viruses to make extensive contacts with the passengers. This led to the suggestion of keeping the door closed. However, when the forward door is shut, face-to-face speaking can generate viruses that can float in the air for a long time, and it was found that the viruses mainly stay within a half-meter distance in front of the speaking person, before sinking to attach to the deck. Thus, a social-distancing suggestion on seat arrangement has been highlighted to minimise the risk of contagion. Overall, this work is expected to inform guidelines on hygienic and reconfiguring means for operators to counter COVID-19 and potentially the spread of similar viruses in the future.","PeriodicalId":408227,"journal":{"name":"Volume 5A: Ocean Engineering","volume":"10 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":"129914755","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

Application of Dipole Damper Panels in Modelling Gap Resonance 偶极阻尼板在间隙共振建模中的应用

Volume 5A: Ocean Engineering Pub Date : 2022-06-05 DOI: 10.1115/omae2022-78986

Babak Ommani, Senthuran Ravinthrakumar, T. Kristiansen, Idunn Olimb, Bernt Karsten Lyngvær

{"title":"Application of Dipole Damper Panels in Modelling Gap Resonance","authors":"Babak Ommani, Senthuran Ravinthrakumar, T. Kristiansen, Idunn Olimb, Bernt Karsten Lyngvær","doi":"10.1115/omae2022-78986","DOIUrl":"https://doi.org/10.1115/omae2022-78986","url":null,"abstract":"\u0000 Modelling the fluid response in a gap using conventional frequency domain potential flow solvers is a challenge due to its resonance behavior and the importance of viscous effects. Damping panels, or lids, are usually used to represent the main viscous effects, when more direct method of calculation is not applicable due to limitations on time or computation resources. Although, it is known that the main contributor to the damping is the flow separation at the gap inlet, these methods usually relate the magnitude of the effective damping to the vertical fluid velocity at the surface. In the present study, the application of dipole damping surfaces, as introduced in potential flow code WAMIT, is studied for modelling the flow separation effects more consistently. The relative fluid velocity at the inlet is used to model the damping effect of flow separation. Simplified empirical models are proposed to estimate the magnitude of the damping. The experimental study of flow between two side by side barges by Molin et a. 2009 [1] has been selected to evaluate the present modelling approach. The numerical results show good agreement with the measurements while providing a more consistent basis to apply stochastic linearization of the quadratic damping due to flow separation at the gap inlet.","PeriodicalId":408227,"journal":{"name":"Volume 5A: Ocean Engineering","volume":"1 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":"116132211","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

Further Investigation on Wave Impact Loads on the Underside of a 2D Flat-Bottomed Model 二维平面模型底面波浪冲击载荷的进一步研究

Volume 5A: Ocean Engineering Pub Date : 2022-06-05 DOI: 10.1115/omae2022-78926

Daniel de Oliveira Costa, Julia Perim, Joel Sena Sales Junior, A. C. Fernandes

{"title":"Further Investigation on Wave Impact Loads on the Underside of a 2D Flat-Bottomed Model","authors":"Daniel de Oliveira Costa, Julia Perim, Joel Sena Sales Junior, A. C. Fernandes","doi":"10.1115/omae2022-78926","DOIUrl":"https://doi.org/10.1115/omae2022-78926","url":null,"abstract":"\u0000 Slamming loads due to wave impact is a topic which can be related to several different situations in the areas of ocean engineering, such as the lowering of a subsea module through the wave splash zone during launching operations or wave loads underneath riser decks and other appendages on stationary units. In a previous study, the case of a flat-bottomed model submitted to regular incoming waves was explored numerically and experimentally to reproduce, in a reduced scale, cases available in the literature.\u0000 The present work aims to further investigate the case of a flat box, extending the analysis to a broader combination of wave properties to verify their effects over the coefficients. Slamming and suction coefficients are adopted to represent the loads through nondimensional parameters. Experimental data is presented for a 2D assembly, with a detailed discussion on the methods for the evaluation of the nondimensional coefficients. Typical time series are presented, and different types of impact events are displayed. Estimations based on the von Karman based approach are presented and compared to experimental data. Model tests are carried out at the wave tank of the Laboratory of Waves and Currents (LOC – COPPE/UFRJ).","PeriodicalId":408227,"journal":{"name":"Volume 5A: Ocean Engineering","volume":"54 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":"114469125","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

Data Driven Digital Twin Applications Towards Green Ship Operations 数据驱动的数字孪生应用于绿色船舶运营

Volume 5A: Ocean Engineering Pub Date : 2022-06-05 DOI: 10.1115/omae2022-78775

Mahmood Taghavi, L. Perera

{"title":"Data Driven Digital Twin Applications Towards Green Ship Operations","authors":"Mahmood Taghavi, L. Perera","doi":"10.1115/omae2022-78775","DOIUrl":"https://doi.org/10.1115/omae2022-78775","url":null,"abstract":"\u0000 Due to the growing rate of energy consumption and its consequent emissions, the International Maritime Organization (IMO) has devised strict rules for an extensive reduction in Greenhouse Emissions (GHG), which forces the shipping industry to search for more energy-efficient solutions. Therefore, alongside with the Energy Efficiency Design Index (EEDI), improving the energy efficiency of existing ships under the Energy Efficiency Existing Ship Index (EEXI) is of considerable importance. This paper address this issue by proposing a digital twin framework supported by big data analytics for ship performance monitoring. The proposed framework is developed by the respective data sets from a selected vessel. For this purpose, a cluster analysis is implemented using the Gaussian Mixture Models (GMMs) with the Expectation Maximization (EM) algorithm. By this approach, the most frequent operating regions of the engine is detected, the shapes of these frequent operating regions are captured, and the relationships between different navigation and performance parameters of the engine are determined. That will make the basis for a digital twin application in shipping. The main objective of this research study is to develop a digital twin of a marine engine by considering the engine operational conditions that can be utilized toward green ship operations. The contribution of this paper and the outcomes can facilitate the shipping industry to meet the IMO requirements enforced by its regulations.","PeriodicalId":408227,"journal":{"name":"Volume 5A: Ocean Engineering","volume":"1 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":"122826153","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

Dynamic Response of Local Hull Structures Under Moving Slamming Loads 运动冲击荷载作用下船体局部结构的动力响应

Volume 5A: Ocean Engineering Pub Date : 2022-06-05 DOI: 10.1115/omae2022-81032

Yunbin Chen, Ling Zhu

{"title":"Dynamic Response of Local Hull Structures Under Moving Slamming Loads","authors":"Yunbin Chen, Ling Zhu","doi":"10.1115/omae2022-81032","DOIUrl":"https://doi.org/10.1115/omae2022-81032","url":null,"abstract":"\u0000 The bow of a ship is often subjected to the action of moving slamming loads, and the slamming phenomenon occurs frequently, which has significant effect on the local and global structural response. In this paper, Euler-Bernoulli beam theory and modal superposition method are adopted to study the dynamic response of a beam under the moving slamming load. The slamming pressure is characterized as pulse load that moving along the longitudinal direction at a constant speed. The problem is solved using a Fourier sine integral transformation in space and a Laplace-Carson integral transformation in time. Deflection and stress as functions of time and position for different speeds, bending stiffnesses, etc. are given. The cases that arrival of a pulse load on a beam, steady-state vibration, departure of a pulse load from a beam all have been considerated in theoretical model. Based on the proposed theoretical model, the influence of parameters such as load rising section coefficient, migration velocity on the dynamic response of beams under moving slamming load is studied and the associated results are compared with those using the finite element method. The proposed theoretical model is useful in understanding the slamming impact and evaluating the dynamic response of structural components under slamming loads.","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":"116739817","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

Use of a Linear Discretization of the Velocity Potential in the Frequency-Domain Linear Potential Flow Theory 频率域线性势流理论中速度势线性离散化的应用

Volume 5A: Ocean Engineering Pub Date : 2022-06-05 DOI: 10.1115/omae2022-80174

P. Wuillaume, Lucas Letournel, F. Rongère, Camille Chauvigné

引用次数: 0

Numerical Modeling of Moored Floating Platforms for Wave Energy Converters Using DualSPHysics 波浪能转换器系泊浮式平台的双物理数值模拟

Volume 5A: Ocean Engineering Pub Date : 2022-06-05 DOI: 10.1115/omae2022-78810

B. Tagliafierro, I. Martínez-Estévez, César Crego-Loureiro, J. Dominguez, A. Crespo, R. Coe, G. Bacelli, M. Gómez-Gesteira, G. Viccione

{"title":"Numerical Modeling of Moored Floating Platforms for Wave Energy Converters Using DualSPHysics","authors":"B. Tagliafierro, I. Martínez-Estévez, César Crego-Loureiro, J. Dominguez, A. Crespo, R. Coe, G. Bacelli, M. Gómez-Gesteira, G. Viccione","doi":"10.1115/omae2022-78810","DOIUrl":"https://doi.org/10.1115/omae2022-78810","url":null,"abstract":"\u0000 The DualSPHysics open-source code establishes a comprehensive and efficient framework for simulating coastal and ocean engineering structures, which has been proven to be particularly reliable in wave energy converter (WEC) simulation. In this research, the experimental data of the floating oscillating surge wave energy converter (FOSWEC), is used for validation purposes. The FOSWEC2 device developed by SANDIA National Laboratories (US) is quite complex as it has several floating parts, anchor legs and a power take-off system (PTO) connected to the pitching motion of two flaps. Kinetic energy is in fact converted from the relative rotation between the flaps and a movable frame of the platform, setting a significant challenge for the validation of the FOSWEC with time-domain integrated methods. This work proposes a first validation campaign carried out using regular waves, and considering different parameters for the definition of the PTO system. The numerical model prediction for the platform motion (surge and pitch) and the relative flap pitch angle (bow and aft) shows that the model is able to deal with multi-body dynamics interacting with wave-induced forces.","PeriodicalId":408227,"journal":{"name":"Volume 5A: Ocean Engineering","volume":"1 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":"129365191","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

A Study on Safer New Optimal Route for Anti-Collision in Coastal Waters 沿海水域安全新型最优避碰路线研究

Volume 5A: Ocean Engineering Pub Date : 2022-06-05 DOI: 10.1115/omae2022-79685

Won-Ouk Kim, Song-Jin Kang, Young-Rong Kim, Chang-Je Kim

{"title":"A Study on Safer New Optimal Route for Anti-Collision in Coastal Waters","authors":"Won-Ouk Kim, Song-Jin Kang, Young-Rong Kim, Chang-Je Kim","doi":"10.1115/omae2022-79685","DOIUrl":"https://doi.org/10.1115/omae2022-79685","url":null,"abstract":"\u0000 Although radar and AIS alarm functions have been used as support measures for collision prevention in many ships, they lacked the function to identify actual collision risk ships and inform the degree of risk and did not provide information on avoidance routes. This study aims to design a newly developed safer new optimal route for anti-collision based on the Collision Risk Zone assessment method, targeting mainly very small-sized ships that caused most of the collision accidents due to human errors. Designing a safer new optimal route is composed of three segments according to the ship’s characteristics. That is, empirical method for small-sized ships, collision risk zone method for larger ships and then combination method between empirical and collision risk method. In addition, this study analyzed the collision risk of various scenarios according to the navigation relationships and speed conditions between the two meeting ships. As a result, the model proposed in this study numerically calculated the risk of collision according to the navigation situation and could provide a safe optimal avoidance path accordingly. Therefore, this model can be applied to build the collision avoidance model of not only the current ship but remote-controlled ship, which is under compliance with COLREG regulations and involves the possibility of human error in an operation.","PeriodicalId":408227,"journal":{"name":"Volume 5A: Ocean Engineering","volume":"1 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":"129131850","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

Wave Drift Forces and Low Frequency Drift Motions for Mooring Analysis of a Spread Moored FPSO 扩张式系泊FPSO系泊的波浪漂移力和低频漂移运动分析

Volume 5A: Ocean Engineering Pub Date : 2022-06-05 DOI: 10.1115/omae2022-79066

M. Zhang, Nuoya Xu, Tianen Yang, N. Fonseca, F. Mood

{"title":"Wave Drift Forces and Low Frequency Drift Motions for Mooring Analysis of a Spread Moored FPSO","authors":"M. Zhang, Nuoya Xu, Tianen Yang, N. Fonseca, F. Mood","doi":"10.1115/omae2022-79066","DOIUrl":"https://doi.org/10.1115/omae2022-79066","url":null,"abstract":"\u0000 This paper presents a comparison study on wave drift models as well as corresponding low frequency (LF) drift motions for mooring analysis of a spread moored FPSO in moderate seastates with and without current. There are four wave drift force models applied in this study, including two numerical models from potential theory with Newman’s approximation and full quadratic transfer functions (QTFs), two combined models determined from cross bi-spectral (CBS) analysis of model test data and merged with two numerical potential flow wave drift force models at low and high frequencies, respectively. The comparison is performed in terms of both diagonal and off diagonals with constant difference frequency.\u0000 The equations of motion are solved in the time domain with a fully coupled method, accounting for different wave drift forces models. Both the LF motion response spectra and the time domain series are presented and discussed. The LF damping is adjusted by comparing simulations to the corresponding model test data and tuning the results. The results show the underestimates of wave drift forces as well as the corresponding LF motions by second order potential flow theory, especially in the cases with current. Application of full QTFs can improve the simulation results in terms of phasing of LF responses.","PeriodicalId":408227,"journal":{"name":"Volume 5A: Ocean Engineering","volume":"43 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":"124115017","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