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Computational analysis of fluid-structure interaction in moving mechanical valves

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Computational analysis of fluid-structure interaction in mov...

第五届国际非线性力学会议

作者： De-cheng Wan (State Key Laboratory of ocean engineering School of Naval Architecture ocean and civil engineering Shanghai Jiao Tong University Shanghai 200030 China)

＜正＞The multigrid fictitious boundary finite element method for numerical simulations of a two-dimensional induced-moving rigid heart valve in a channel with sinus cavity was *** main advantage of this methodology is to allow the numerical treatment on a fixed structured mesh and the use of fast *** examples were provided to show the efficiency of the presented method for detailed simulations of valve induced-motion and fluid flows around the valve in incompressible viscous flows.

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球与细长圆锥杆纵向碰撞问题动力学分析

上海交通大学学报 2009年第10期43卷 1662-1666页

作者：董富祥洪嘉振上海交通大学船舶海洋与建筑工程学院上海200240

基于波传播法对球与细长圆锥杆纵向碰撞动力学问题进行研究.建立了考虑非线性弹性接触变形的球与圆锥杆纵向碰撞的动力学方程,通过引入分段求解的思想,提出了球与圆锥杆碰撞动力学方程的求解算法.通过对钢球与铝圆锥杆低速碰撞问题进行... 详细信息

基于波传播法对球与细长圆锥杆纵向碰撞动力学问题进行研究.建立了考虑非线性弹性接触变形的球与圆锥杆纵向碰撞的动力学方程,通过引入分段求解的思想,提出了球与圆锥杆碰撞动力学方程的求解算法.通过对钢球与铝圆锥杆低速碰撞问题进行数值仿真,讨论了不同锥度和质量比等因素对碰撞力和动力学响应的影响,研究了不同锥度条件下应变波传播性质,为今后实验和数值研究提供了理论参考.研究结果表明:圆锥杆锥度和质量比等参数对碰撞力和圆锥杆上速度响应作用明显;由截面不等引起的锥度对应变波传播造成的影响不可忽视.

关键词：纵向碰撞球圆锥形杆波传播法局部接触原理

Axi-symmetric Active Earth Pressure for Layered Backfills Obtained by the Slip Line Method

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Journal of Shanghai Jiaotong university(Science) 2008年第5期13卷 579-584页

作者：刘发前王建华张璐璐 School of Naval Architecture Ocean and Civil Engineering Shanghai Jiaotong University

The axi-symmetric active earth pressure for layered backfills was investigated using the slip line method. Due to different soil properties, the interfaces of the soil layers were considered as discontinuity surface. Accordingly, the change of the major principal direction was obtained and a new computation scheme was proposed to deal with the discontinuity in the calculation, finally the slip line method was extended to layered backfills. Results indicate that, the major principal direction, as well as the earth pressure, has a finite jump on passing the soil interfaces. The magnitude of the jump depends on the soil properties mainly. Generally, the active earth pressure when a strong layer is overlying a weak layer is much larger than that when the weak layer is lying on the strong layer. The present solution can be reduced to plane strain case and it has been compared with Rankine's and Coulomb's results, and a good agreement is observed.

关键词： axi-symmetry earth pressure slip line method layered backfill soil-wall friction

OPTIMIZING LAYOUT OF URBAN STREET CANYON USING NUMERICAL SIMULATION COUPLING WITH MATHEMATICAL OPTIMIZATION

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Journal of Hydrodynamics 2006年第3期18卷 345-351页

作者： WANG Jia-song ZHAO Bao-qing YE Chun YANG De-qing HUANG Zhen School of Mechanical and Power engineering Shanghai Jiaotong University Shanghai 200030 China School of Naval Architecture Ocean and Civil Engineering Shanghai Jiaotong University Shanghai 200030China

Optimizing the layout of the urban street canyon to achieve the maximum environmental benefits should become a new idea for modem urban street design and planning. This paper aims to find out the optimized street canyon from a viewpoint of environmental protection by using the two-dimensional numerical simulation model with the κ-ω turbulence model, coupling with the mathematical optimization method. The total pollutant concentration within and at top of the specific street canyons was taken as the objective function, and the height of one side of the canyon as the constrained condition. A nonlinearly improved constrained variable metric solver was used. The effect of the height of the leeward building and windward building on the integrated pollutant dispersion was studied to achieve the most beneficial configuration of the urban geometry. The optimization of layout for an asymmetrical street canyon was obtained. It is further found that the step-down street canyon with a large height difference is generally a good layout favoring to reduce the concentration accumulation in the street canyon.

关键词： street canyon mathematical optimization numerical simulation street layout

PC/ABS高分子合金材料的热黏塑性内时本构模型

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上海交通大学学报 2011年第10期45卷 1465-1468,1474页

作者：鲁佳宝赵社戌上海交通大学船舶海洋与建筑工程学院上海200240

针对PC/ABS(聚碳酸酯/丙烯腈-丁二烯-苯乙烯)高分子合金材料在冲击压缩下所表现出的强非线性行为,包括温度相关性、率相关性及应变强化-软化-再强化的特性等,建立了一个考虑ABS增韧机理的内时变量的内时本构模型,由此对PC/ABS合金在20°... 详细信息

针对PC/ABS(聚碳酸酯/丙烯腈-丁二烯-苯乙烯)高分子合金材料在冲击压缩下所表现出的强非线性行为,包括温度相关性、率相关性及应变强化-软化-再强化的特性等,建立了一个考虑ABS增韧机理的内时变量的内时本构模型,由此对PC/ABS合金在20°C、70°C下,压缩冲击应变率分别为8.0×102、2.7×103、1.0×104s-1时的真应力-应变曲线进行了模拟,并与相关文献中的实验数据进行了比较.结果表明,文中所建热黏塑性内时本构模型能够较好地描述PC/ABS合金材料的冲击压缩响应.

关键词：聚碳酸酯/丙烯腈-丁二烯-苯乙烯合金内时变量热黏塑性本构模型

Numerical Analysis of Incompressible Viscous Flows Interacting with Flexible Structures

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Numerical Analysis of Incompressible Viscous Flows Interacti...

Numerical Simulations of Viscous Flow around Multi-Hull Ship by Overset Grid Techniques

The Fifth International Conference on Fluid Mechanics

作者： D.C.Wan State Key Laboratory of ocean engineering School of Naval Architecture ocean and civil engineering Shanghai Jiao Tong University Shanghai 200030 China

＜正＞In this paper,an efficient way to treat the interaction between an incompressible viscous fluid and an elastic body in a fully coupled arbitrary Lagrangian-Eulerian formulation is presented. The constitutive relations for both fluid and flexible body are unified into the same form,and flexible body part is imagined as a special fluid which can have the same form of governing equations as the Navier-Stokes equations for fluid *** example of an incompressible viscous channel flow around an elastic plate attached on the solid channel wall which results in self-induced oscillations of the structure is provided to show the efficiency of the presented method for detailed simulations of incompressible viscous flows interacting with flexible structures.

关键词： flexible structure viscous flows ALE FEM

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Numerical Simulations of Viscous Flow around Multi-Hull Ship...

Numerical Simulation of Rock Fracturing under Uniaxial Compression Using Virtual Internal Bond Model

第十五届中国海洋（岸）工程学术讨论会

作者： Shen Zhirong,Ma Juan,Wan Decheng (State Key Laboratory of ocean engineering,School of Naval Architecture,ocean and civil engineering,Shanghai Jiao Tong University,Shanghai 200240)

Since multi-hull ship has good resistance and seakeeping performances in sea waves as well as a bigger deck area compared with the ordinary mono-hull ship,it has been applied not only for civil use but also for *** present work,numerical simulation of viscous flows around two common types,catamaran and trimaran,based on RANS method coupled with overset grid technique and level set method,is *** free-surface is taken into account and treated by level-set *** grid technique is employed to embed the body-fit hull grids into an orthogonal background *** distance gap between ship hulls can be adjusted easily by the overset grid technique without regenerating the mesh,such that the optimal distance gap between ship hulls can be figured *** for each distance gap,a serial of calculation with different Froude numbers is carried out to predict the resistance characteristics and find out the optimal distance gap and ship hull *** also includes the complex wave patterns produced by the multi-hull ship.

关键词： Catamaran trimaran overset grid Level-set resistance

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Journal of Shanghai Jiaotong university(Science) 2009年第4期14卷 423-428页

作者：柯长仁蒋俊玲葛修润 School of Naval Architecture Ocean and Civil Engineering Shanghai Jiaotong University School of civil engineering Hubei University of Technology Institute of Rock and Soil Mechanics The Chinese Academy of Science

A multi-scale virtual internal bond (VIB) model for the isotropic materials has been recently proposed to describe the material deformation and fracturing. During the simulation process of material fracturing using VIB, the fracture criterion is directly built into the constitutive formulation of the material using the cohesive force law. Enlightened by the similarity of the damage constitutive model of rock under uniaxial compression and the cohesive force law of VIB, a VIB density function of rock under uniaxial compression is suggested. The elastic modulus tensor is formulated on the basis of the density function. Thus the complete deformation process of rock under the uniaxial compression is simulated.

关键词： virtual internal bond rock uniaxial compression stress-strain curve

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大变形弹塑性梁的刚-柔耦合动力学特性

上海交通大学学报 2011年第10期45卷 1469-1474页

作者：石望刘锦阳上海交通大学船舶海洋与建筑工程学院上海200240

研究了大变形弹塑性梁的刚-柔耦合动力学特性.从弹塑性梁的非线性本构关系和非线性应变-位移关系出发,给出了曲率的精确表达式;基于绝对节点坐标法,用虚功原理建立了大变形弹塑性梁的动力学变分方程;用有限元法对梁进行离散,建立了大变... 详细信息

研究了大变形弹塑性梁的刚-柔耦合动力学特性.从弹塑性梁的非线性本构关系和非线性应变-位移关系出发,给出了曲率的精确表达式;基于绝对节点坐标法,用虚功原理建立了大变形弹塑性梁的动力学变分方程;用有限元法对梁进行离散,建立了大变形弹塑性梁的刚-柔耦合动力学方程.对重力作用下的柔性单摆进行数值仿真.结果表明,弹塑性梁的横向变形呈现平均值大和振幅衰减的特征,计算结果较基于小变形理论的一次近似模型稳定,适用于大变形问题.

关键词：大变形弹塑性梁非线性本构关系动力学