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GPU-Based DEM Simulations of Global Ice Resistance on Ship hull During Navigation in Level Ice

China Ocean Engineering 2021年第2期35卷 228-237页

作者： HU Bing LIU Lu WANG De-yu JI Shun-ying State Key laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China China COSCO SHIPPING Corporation Limited Shanghai 200027China State Key laboratory of Structural Analysis for Industrial Equipment Dalian University of TechnologyDalian 116023China

The ice resistance on a ship hull affects the safety of the hull structure and the ship maneuvering performance in icecovered *** this paper,the discrete element method(DEM)is adopted to simulate the interaction between level ice and ship *** level ice is modeled with 3D bonded spherical elements considering the buoyancy and drag force of the *** parallel bonding approach and the de-bonding criterion are adopted to model the freezing and breakage of level *** ship hull is constructed with rigid triangle *** improve computational efficiency,the GPU-based parallel computational algorithm was developed for the DEM *** the interaction between the ship hull and level ice,the ice cover is broken into small blocks when the interparticle stress approaches the bonding *** global ice resistance on the hull is calculated through the contacts between ice elements and hull elements during the navigation *** influences of the ice thickness and navigation speed on the dynamic ice force are analyzed considering the breakage mechanism of ice *** Lindqvist and Riska formulas for the determination of ice resistance on ship hull are employed to validate the DEM *** comparison of results of DEM,Lindqvist,and Riska formula show that the DEM result is between those the Lindqvist formula and Riska *** the proposed DEM is an effective approach to determine the ice resistance on the ship *** work can be aided in the hull structure design and the navigation operation in ice-covered fields.

关键词： global ice resistance ship hull discrete element method level ice GPU-based parallel computation

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Recent Advances to Change the Standards in designing hulls in Waves, a Validation Using an Efficient SWENSE Level-Set Approach

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Journal of Shipping and Ocean Engineering 2016年第6期6卷 323-338页

作者： Ivan Schrooyen Mikael Berton Karl Randle ULSTEIN design & SOLUTIONS Ulsteinvik/Norway LEMMA Biot/France

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Parametric design Techniques Applied to Creative Hollow out Product design with 3D Voronoi Patterns

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Journal of Computer and Communications 2021年第8期9卷 32-47页

作者： Hui-Chin Chang Department of Creative Product design HungKuo Delin University of Technology Taiwan

The creation of hollow out art includes a variety of materials, techniques and categories, its content mostly emphasizes the ancient philosophy performance of the alternation of virtual and real, and Yin-Yang depends on the essence of Chinese culture deduction. If this feature is applied to product design, in addition to emphasizing functional orientation, this traditional arts integration with the new media, will give users a different visual inspire. This thesis is mainly in view of the importance of hollow out art in Chinese cultural heritage, and the 3D hollow out production craft has gradually lost. Therefore, the Delaunay triangle is constructed based on the Convex hull interpolation algorithm, and the Voronoi Diagram feature is constructed based on the Divide and Conquer algorithm. And with Rhino modeling software as the main body, combined with the application of the parametric plug-in design program (GH), the 3D models of the parametric creative hollow pen holder and the parametric creative hollow lampshade were respectively completed. The traditional craftsmanship is integrated into the modern manufacturing process with innovative techniques, and the Chinese cultural spirit and beauty of nature are successfully connected.

关键词： Parametric design Hollow Out Product 3D Voronoi Patterns

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An investigation on HOBEM in evaluating ship wave of high speed displacement ship

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Journal of Hydrodynamics 2019年第3期31卷 531-541页

作者： Xi Chen Ren-chuan Zhu Ya-lan Song Ju Fan Marine design & Research Institute of China Shanghai 200011 China State Key L aboratory of Ocean Engineering Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai 200240 China

A practical numerical tool is developed to evaluate ship waves of high speed displacement ships on the basis of potential flow theory, in which high order boundary element method (HOBEM) based on biquadratic shape functions is applied to solve the boundary value problem. Since the sinkage and trim of ship at high speeds are notable, influences of ship attitude on wave drag are investigated and three kinds of models are used to evaluate them. To make the numerical approach highly efficient, an incomplete LU factorization preconditioner is adopted and incorporated with the restarted generalized minimal residual method GMRES (m) to solve the boundary integral equation. A corresponding Fortran code is developed and applied to evaluate ship waves of the Wigley hull and 4a model, a transom stem ship. Computations are performed for both monohulls and catamarans over a wide range of Froude numbers (Fr= 0.10-l.00). Numerical issues including mesh convergence and computational efficiency are investigated at first. Computed results of the wave drag, sinkage and trim show generally good agreement with experimental data. Reasonable wave patterns are obtained and physical phenomena that wake angle max, where the largest waves occur, would become narrow at high speeds is also captured by the present computations. Numerical results indicate the proposed method would be accurate and efficient to evaluate resistance for hull design of high speed displacement ship.

关键词： High speed ship ship waves HOBEM ILU-GMRES sinkage and trim

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Dynamic Stress Analysis of the Leg Joints of Self-Elevating Platform

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China Ocean Engineering 2011年第2期25卷 319-326页

作者：黄曌宇唐文勇汪怡王文涛 State Key laboratory of Ocean Engineering Shanghai Jiao Tong University Shanghai Zhenhua Heavy Industry Co.Ltd

Since a self-elevating platform often works in water for a long time, the lattice leg is largely influenced by wave and current. The amplitude of leg joint stresses is a very important factor for the fatigue life of the platform. However, there are not many researches having been done on the mechanism and dynamic stress analysis of these leg joints. This paper focuses on the dynamic stress analysis and suppression methods of the leg joints of self-elevating platforms. Firstly, the dynamic stresses of the lattice leg joints are analyzed for a self-elevating platform by use of the 5th-order Stokes wave theory. Secondly, the axial and bending stresses are studied due to their large contributions to total stresses. And then, different joint types are considered and the leg-hull interface stiffness is analyzed for the improvement of the joint dynamic stress amplitude. Finally, some useful conclusions are drawn for the optimization design of the self-elevating platform.

关键词： self-elevating platform leg joint dynamic stress stress amplitude improvement

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Optimal Structural design of the Midship of a VLCC Based on the Strategy Integrating SVM and GA

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Journal of Marine Science and Application 2012年第1期11卷 59-67页

作者： Li Sun (1) welqi1986@*** Deyu Wang (1) State Key laboratory of Ocean Engineering Shanghai Jiao Tong University

在这份报纸，当模特儿和优化的一个混合过程，集成一台支持向量机器(SVM ) 和基因算法(GA ) ，被介绍在轮船的结构的优化减少高时间费用。SVM，根植于统计学习理论和结构的风险最小化的方法的近似实现，能在真实问题并且因而的输入产量... 详细信息

在这份报纸，当模特儿和优化的一个混合过程，集成一台支持向量机器(SVM ) 和基因算法(GA ) ，被介绍在轮船的结构的优化减少高时间费用。SVM，根植于统计学习理论和结构的风险最小化的方法的近似实现，能在真实问题并且因而的输入产量关系高减少的 metamodeling 提供好归纳表演时间在真实问题的分析花费了，例如女性的分析。作为一种强大的优化技术， GA 为几乎不能与普通基于坡度的优化方法被优化的问题拥有显著优点，它为优化 SVM 造的模型使它合适。基于 SVM-GA 策略，在一个很大的粗略的搬运人( VLCC )的船体中央部的结构的少量的优化轮船在普通结构的规则( CSR )根据直接力量评价方法被执行，它最后在优化轮船表明 SVM-GA 的高效率在重计算复杂性下面的结构的少量。有 SVM-GA 的这优化的时间费用严厉地被减少了，许多更多的环在时间的小数量以内被处理了，设计显著地被改进了。

关键词：优化结构设计超大型油轮船舶结构 GA优化 SVM 结构风险最小化支持向量机时间成本

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Homotopy Method for Inverse design of the Bulbous Bow of A Container Ship

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China Ocean Engineering 2017年第1期31卷 98-102页

作者： HUANG Yu-jia FENG Bai-wei HOU Guo-xiang GAO Liang XIAO Mi School of Naval Architecture and Ocean Engineering Huazhong University of Science and Technology Wuhan 430074 China Key laboratory of High Performance Ship Technology of Ministry of Education Wuhan University of Technology Wuhan 430063 China State Key laboratory of Digital Manufacturing Equipment and Technology Huazhong University of Science and Technology Wuhan 430074 China

The homotopy method is utilized in the present inverse hull design problem to minimize the wave-making coefficient of a 1300 TEU container ship with a bulbous bow. Moreover, in order to improve the computational efficiency of the algorithm, a properly smooth function is employed to update the homotopy parameter during iteration. Numerical results show that the homotopy method has been successfully applied in the inverse design of the ship hull. This method has an advantage of high performance on convergence and it is credible and valuable for engineering practice.

关键词： Container iteration inverse utilized properly minimize container valuable Marquardt consuming

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The Numerical Simulation of a Towing Cylinder Based on Immersed Body Boundary Method

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Journal of Shanghai Jiaotong university(Science) 2016年第2期21卷 136-142页

作者：钱鹏易宏李英辉 State Key laboratory of Ocean Engineering School of Naval Architecture Ocean and Civil EngineeringShanghai Jiaotong University

An immersed body boundary method is adopted to track the motions of a towing cylinder, and a homogenous multiphase Eulerian-Eulerian fluid approach is used to capture the free surface. The Reynolds average Navier-Stockes(RANS) solver is applied to all gird nodes to deal with different velocities of the nodes that are in the body boundary, near the boundary and out of the boundary and their effect on the fluid. The towing cylinder resistance at different submerged depths in the tank is presented. The simulation results are compared with the experimental data, and the method is verified and validated. Finally, the hydrodynamic characters of the cylinder are discussed further. The numerical and experimental results show that at high speeds, the deeper the cylinder submerges, the lower resistance it suffers. The resistance coefficient trough is obtained at Froude number in the range of 0.3 hull(SWATH) design.

关键词： immersed body boundary method towing cylinder two-phase flow model experiment

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Dynamic Stability Analysis of Backhoe Dredger Based on Time Domain Method

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Journal of Shanghai Jiaotong university(Science) 2022年第3期27卷 339-345页

作者：陈熠画陈新权杨启欧阳义平 Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration State Key Laboratory of Ocean EngineeringSchool of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China Shanghai Jiao Tong University Underwater Engineering Institute Co. Ltd.Shanghai 200231China

When incidents happen with the positioning spud of a backhoe dredger,the hull loses stability,heels significantly,and may even capsize under extreme *** the hydrodynamics and spud vibrations,this paper investigates the dynamic stability of a backhoe dredger after spud failure based on the time domain *** maximum dynamic heeling angle verifies the stability of the backhoe *** identify the influences of environmental load,operating conditions,and spud-soil interactions,numerical motion simulations were conducted in the time *** main conclusions on dynamic stability consider the influences of relative environmental and operational *** study provides a powerful and efficient approach to analyze the dynamic stability of backhoe dredgers and to design flooding angles.

关键词： backhoe dredger dynamic stability spud failure time domain

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Practical evaluation of the drag of a ship for design and optimization

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Journal of Hydrodynamics 2013年第5期25卷 645-654页

作者： YANG Chi HUANG Fuxin NOBLESSE Francis Center for Computational Fluid DynamicsGeorge Mason University State Key laboratory of Ocean Engineering and School of Naval Architecture Ocean and Civil EngineeringShanghai Jiao Tong University

We consider two major components of the drag of a ship, the ＂friction drag＂ and the ＂wave drag＂, that are related to viscous friction at the hull surface and wavemaking, and mostly depend on the Reynolds number and the Froude number, respectively. We also consider the influence of sinkage and trim, viscosity, and nonlinearities on the drag. The sum of the friction drag given by the classical ITTC friction formula and the wave drag predicted by the modification, called Neumann-Michell （NM） theory, of the classical Neumann-Kelvin theory of ship waves is found to be within about 10% of experimental drag measurements for four ship hulls for which theoretical predictions and experimental measurements are compared. The sum of the ITTC friction drag and the NM wave drag can then be expected to yield realistic practical estimates that can be useful for routine applications to design and hull- form optimization of a broad range of displacement ships. Furthermore, we note several simple extensions of this highly simplified approach that can be expected to significantly improve accuracy.

关键词： friction drag wave drag Neumann-Michell (NM) theory sinkage and trim nonlinear effects

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