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A TIME DOMAIN INVESTIGATION ON THE HYDRODYNAMIC RESONANCE PHENOMENA OF 3-D MULTIPLE FLOATING STRUCTURES

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Journal of Hydrodynamics 2008年第5期20卷 611-616页

作者： ZHU Hai-rong ZHU Ren-chuan MIAO Guo-ping The state key laboratory of ocean engineering School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai 200030 China

A 3-D time domain method is developed to investigate the gap influence on the wave threes for 3-D multiple floating structures. Special hydrodynamic resonance due to small gaps between multiple floating structures on wave forces is examined. Strong and complicate hydrodynamic interactions between the floating bodies are observed and the numerical computations have proved the existence of the sharp peak force response on each floating body at some special resonant wave numbers. By comparison with the results from the frequency domain technique, the results obtained from the time domain method reveal the similar resonant phenomena and hydrodynamic interaction. The resonant wave numbers are also proved around kL-nπ （n = 1,2 ……∞） with a corresponding frequency shift. The strong hydrodynamic interaction feature is practically significant for the design of module structures and the links （connection） in whole the floating body system.

关键词： time domain resonance hydrodynamic interaction multiple floating bodies gap influence

NUMERICAL SIMULATIONS OF HIGHLY NONLINEAR STEADY AND UNSTEADY FREE SURFACE FLOWS

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Journal of Hydrodynamics 2011年第6期23卷 683-696页

作者： YANG Chi HUANG Fuxin WANG Lijue WAN De-cheng Center for Computational Fluid Dynamics George Mason University Fairfax Virginia USA state key laboratory of ocean engineering School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai 200240 China

A numerical simulation model based on an open source Computational Fluid Dynamics （CFD） package-Open Field Operation and Manipulation （OpenFOAM） has been developed to study highly nonlinear steady and unsteady free surface flows. A two-fluid formulation is used in this model and the free surface is captured using the classical Volume Of Fluid （VOF） method. The incompressible Euler/Navier-Stokes equations are solved using a finite volume method on unstructured polyhedral cells. Both steady and unsteady free surface flows are simulated, which include：（1） a submerged NACA0012 2-D hydrofoil moving at a constant speed, （2） the Wigley hull moving at a constant speed, （3） numerical wave tank, （4） green water overtopping a fixed 2-D deck, （5） green water impact on a fixed 3-D body without or with a vertical wall on the deck. The numerical results obtained have been compared with the experimental measurements and other CFD results, and the agreements are satisfactory. The present numerical model can thus be used to simulate highly nonlinear steady and unsteady free surface flows.

关键词： finite volume Volume Of Fluid (VOF) method nonlinear free surface flows wave body interaction

Quadratic and cubic eddy-viscosity models in turbulent supercavitating flow computation

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Theoretical & Applied Mechanics Letters 2011年第3期1卷 66-70页

作者： Ying Chen,~(1,a)) Chuanjing Lu,~(1,2) and Xin Chen~1 1)Department of engineering Mechanics,School of naval architecture,ocean and civil engineering, shanghai jiao tong university,shanghai 2.02.0,china 2)state key laboratory of ocean engineering,shanghai jiao tong university,shanghai 2.02.0,china state key laboratory of ocean engineering Shanghai Jiao Tong University Shanghai 200240 China

Quadratic and cubic non-linear eddy-viscosity turbulence models(NLEVM) with low Reynolds number(Re) correction were presented to provide better description of anisotropic turbulence stresses in the numerical prediction of supercavitating flows,which are accompanied with large density ratio and large-scaled swirling flow *** applications of the NLEVM were carried out through a self-developed cavitation codes,coupled with a cavitation model based on the transport equation of liquid *** NLEVM were verified capable of capturing more accurate macroscopic shape and hydrodynamic property of supercavity by the benchmark problems of supercavities over simple ***,the cubic NLEVM was further applied to the numerical prediction of supercavitating flow around a complex submerged *** corresponding cavitation behaviors were explored in detail to provide beneficial experience for further research.

关键词： supercavitating flow numerical simulation non-linear turbulence model

Calculation of ship squat in restricted waterways by using a 3D panel method

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Calculation of ship squat in restricted waterways by using a...

船舶PDM管理Windchill系统中大批量数据导入技术的研究

第九届国际水动力学会议

作者： Jian-xi Yao 1,Zao-jian Zou 1,2.1 School of naval architecture,ocean and civil engineering,shanghai jiao tong university,shanghai,china 2 state key laboratory of ocean engineering,shanghai jiao tong university,shanghai,china

A panel method is applied to calculate the sinkage and trim of a ship sailing in a shallow *** hull surface,free surface and channel wall surfaces are discretized into panels on which Rankine sources of constant strengths are *** iterative scheme is used to deal with the nonlinear boundary conditions on free *** boundary condition on water bottom is satisfied by the method of images,whereas the radiation condition is satisfied by raised panels above free *** vertical force and pitching moment are obtained by integrating the hydrodynamic pressure over the hull surface,and the sinkage and trim are calculated according to dynamic *** calculations are performed for Series 60（C B =0.6） *** numerical results are in good agreement with experimental data.

关键词： sinkage trim panel method shallow channel.

来源： cnki会议评论

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cnki会议

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中国造船 2012年第1期53卷 199-206页

作者：常守明汪学锋上海交通大学船舶海洋与建筑工程学院上海200240 上海交通大学海洋工程国家重点实验室上海200240

利用Windchill系统管理船舶设计制造信息,首先遇到的问题是大批量数据的导入。针对Windchill本身在处理大批量数据导入时所提供的文档导入功能的不足,开发了以常用的压缩文件的形式、将大批量数据压缩后上传到Windchill服务器端并解压... 详细信息

利用Windchill系统管理船舶设计制造信息,首先遇到的问题是大批量数据的导入。针对Windchill本身在处理大批量数据导入时所提供的文档导入功能的不足,开发了以常用的压缩文件的形式、将大批量数据压缩后上传到Windchill服务器端并解压保存到Windchill数据库的方法,成功实现了大批量数据的高效导入。该方法简洁、方便、快捷,为Windchill在船舶PDM管理中的有效应用,提供了具有一定实用价值的手段。

关键词： Windchill 解压缩文件数据库

Effect of preforming on the formability of TRIP steel sheet forming processes

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Baosteel Technical Research 2012年第1期6卷 27-31页

作者： LUO Aihui1,2),DAN Wenjiao3) and ZHANG Weigang3) 1) Auto Steel Division,Research Institute,Baoshan Iron & Steel Co.,Ltd.,shanghai 2.1900,china 2) state key laboratory of Development and Application Technology of Automotive Steels (Baosteel),shanghai 2.1900,china 3) School of naval architecture,ocean and civil engineering,shanghai jiao tong university,shanghai 2.02.0,china Auto Steel Division Research Institute Baoshan Iron & Steel Co. Ltd. Shanghai 201900 China state key laboratory of Development and Application Technology of Automotive Steels(Baosteel) Shanghai 201900 China School of naval architecture Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai 200240 China

In this study,the formability of transformation-induced plasticity (TRIP) steel is studied during deep-drawing processes with *** effects of preforming on theminimum thickness of can are investigated with a constitutive model accompanying strain-induced martensite transformation in prestrain *** constitutive model has been implemented into ABAQUS/UMAT for analysis of TRIP steel-forming *** results show that preforming slightly influences the thickness uniformity of TRIP steel in forming.

关键词： martensite transformation TRIP steel deep-drawing preforming formability

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船舶管线隔振支座布局优化设计的规范法

中国造船 2012年第1期53卷 62-78页

作者：杨德庆马涛陈卫林新志上海交通大学船舶海洋与建筑工程学院海洋工程国家重点实验室上海200030 美国西北大学机械工程系中国船舶重工集团公司第七二五研究所洛阳471039

国内关于船舶管道隔振支承布局优化设计的标准和方法目前还没有建立,有关优化模型及算法的研究有待开展。借鉴美国ASME B31规范和综合考虑强度、刚度、稳定性、固有频率及振级落差等约束条件,提出了管线系统支座布局优化设计模型及规范... 详细信息

国内关于船舶管道隔振支承布局优化设计的标准和方法目前还没有建立,有关优化模型及算法的研究有待开展。借鉴美国ASME B31规范和综合考虑强度、刚度、稳定性、固有频率及振级落差等约束条件,提出了管线系统支座布局优化设计模型及规范设计法。该方法根据ASME B31规范初步确定支座的数量,通过几何优化设计支座的间距。提出迭代优化算法求解这上述问题,获得较优的支座数目与支座间距。通过算例,研究了不同优化目标函数的选择,(如支座造价、管线最大下垂或结构应变能等),对优化结果的影响;证明了有关模型与算法的有效性和实用性。

关键词：管线支座布局优化隔振

The jet over a stretching wall with suction or injection

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Science china(Physics,Mechanics & Astronomy) 2011年第3期54卷 502-510页

作者： XU Hang wu guoxiong state key laboratory of ocean engineering School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai 200240 China Department of Mechanical engineering University College London London WC1E7JE UK

The steady laminar wall jet over a stretching surface in the presence of lateral suction or injection is considered. Similarity solutions absent in previous publications are found in some new ranges of parameters in the governing equation. The accuracy and reliability of the solutions have been checked through detailed convergence study and compared with the solutions from the numerical method and analytic method, and excellent agreement has been found. This gives the strongest evidence that those solutions are indeed new ones.

关键词： wall jet stretching wall injection/suction similarity solution

Experimental Study on engineering Behavior of Solidified Soil for Scour Repair and Protection

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china ocean engineering 2024年第4期38卷 625-635页

作者： wu Xiao-ni LI Ru-yu SHU Jian TANG Chao CHEN Jin-jian WANG Hui-li JIANG Hai-li WANG Xiao state key laboratory of ocean engineering Department of Civil EngineeringShanghai Jiao Tong UniversityShanghai 200240China shanghai Road and Bridge Group Co. Ltd.Shanghai 200433China shanghai engineering Research Center of Urban Infrastructure Renewal Shanghai 200032China Jiangsu Kunze Technology Co. Ltd.Nanjing 210000China

A new scour countermeasure using solidified slurry for offshore foundation has been proposed *** solidified slurry is pumped to seabed area around foundation for scour protection or pumped into the developed scour holes for scour repair as the fluidized material solidifies *** the pumping operation and solidification,the engineering behaviors of solidified slurry require to be considered synthetically for the reliable application in scour repair and protection of ocean engineering such as the pumpability related flow value,flow diffusion behavior related rheological property,anti-scour performance related retention rate in solidification and bearing capacity related strength property after *** this study,a series of laboratory tests are conducted to investigate the effects of mix proportion(initial water content and binder content)on the flow value,rheological properties,density,retention rate of solidified slurry and unconfined compressive strength(UCS).The results reveal that the flow value increases with the water content and decreases with the binder *** the solidified slurry exhibits Bingham plastic behavior when the shear rate is larger than 5 s^(-1).The Bingham model has been employed to fit the rheology test results,and empirical formulas for obtaining the density,yield stress and viscosity are established,providing scientific support for the numerical assessment of flow and diffusion of solidified *** rate of solidified slurry decreases with the water flow velocity and flow value,which means the pumpability of solidified slurry is contrary to anti-scour *** unconfined compressive strength after solidification reduces as the water content increases and binder content decreases.A design and application procedure of solidified soil for scour repair and protection is also proposed for engineering reference.

关键词： scour repair and protection solidified soil pumpability strength flow properties anti-scour performance