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THE COMPUTATION OF SEEPAGE FORCE ON MARINE STRUCTURES WITH FINITE ELEMENT METHOD

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Journal of Hydrodynamics 1990年第3期2卷 36-44页

作者： Tang Ling Shanghai institute of applied Mathematics and {2.,Shanghai {3. of technology,Shanghai 2.0072.P.R.China Liu Ying-zhong Shanghai Jiaotong {3.,Shanghai 2.003.,P.R.China

The wave-induced seepage force is investigated on marine structures resting on or buried in the *** bed is modelled as a poroelastic medium containing a nearly saturated *** governing equations are solved with Finite Element *** a pipeline buried in the seabed,agreement between the present numerical results and that of Cheng H.D.(1986)is quite satisfactory.

关键词： THE COMPUTATION OF SEEPAGE FORCE ON MARINE STRUCTURES WITH FINITE ELEMENT METHOD

A preliminary study of variations of the Changjiang Diluted Water between August of 1999 and 2.06

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Acta Oceanologica Sinica 2009年第6期28卷 1-11页

作者： ZHOU Feng XUAN Jiliang NI Xiaobo HUANG Daji Department of Fluid mechanics School of Aeronautics and Astronautics of ZhejiangUniversity Hangzhou310027 China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute ofOceanography State Oceanic Administration Hangzhou 310012 China

A large area hypoxia has been already reported respectively by two interdisciplinary surveys off the Changjiang Estuary since summer of 1999 and 2.06. The bypoxic zone shows distinct year-to-year variations. Observed oceanographic data are first analysized and reveal a big difference for the Changjiang Diluted Water （CDW） between these two periods. These great changes are related to the tremendous reduction of the freshwater discharge and variations of wind fields between these two years. It is also found that the monthly mean intrusion of Kuroshio and its branches has increased in the northern East China Sea （ECS）, but decreased in the southern ECS in August of 2.06 as compared with 1999 on the base of general circulation models. Then, the Regional Ocean Modelling Systems is applied to the East China Sea to evaluate the contributions and relative importance of impacts from the river discharge, wind forcing and open boundary data. Our simulations reproduce the phenomena that more fresh water extends northeastward in 2.06 and forms a negative SSS anomaly to the northeast of the river mouth as compared with 1999, which is consistent with observations. The five group numerical tests suggest that the wind forcing dominates the CDW variations followed by the Kuroshio and its branches. The study implies important roles played by hydrodynamic processes on the variability of hypoxic zone in the study areas.

关键词： Changjiang Diluted Water variations dynamics hypoxia

GENERAL CAUCHY PROBLEM FOR THE LINEAR SHALLOW-WATER EQUATIONS ON AN EQUATORIAL BETA-PLANE

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Journal of Hydrodynamics 2006年第3期18卷 303-309页

作者： SHEN Chun SHI Wei-hui School of Mathematics and Information Yantai Normal University Yantai 264025 China Shanghai institute of applied Mathematics and {2. Shanghai University Shanghai 200072 China Department of Mathematics Shanghai University Shanghai 200444 China

Based on the theory of stratification, the well-posedness of the initial value problem for the linear shallow-water equations on an equatorial beta-plane was discussed. The sufficient and necessary conditions of the existence and uniqueness for the local solution of the equations were presented and the existence conditions for formal solutions of the equations vere also given. For the Cauchy problem on the hyper-plane {t = O}, the local analytic solution were worked out and a special case was discussed. Finally, an example was used to explain the variety of formal solutions for the ill-posed problem.

关键词： stratification initial value problem,well-posedness shallow-water equations

The Weighted Estimates of the Schrdinger Operators on the Nilpotent Lie Group

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Journal of Mathematical Research with Applications 2010年第6期 1023-1031页

作者： Yu LIU Department of Mathematics and mechanics,School of applied Science,{2. of Science and {3. Beijing,Beijing 100083.P.R.China

In this paper we consider the Schrdinger operator-△G + W on the nilpotent Lie group G where the nonnegative potential W belongs to the reverse Hlder class Bq1 for some q1 ≥ D2.and D is the dimension at infinity ... 详细信息

关键词： nilpotent Lie group Schrdinger operators reverse Hlder class.

On Safety Monitoring of Raft Foundation under Sloping Bedrock Conditions

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On Safety Monitoring of Raft Foundation under Sloping Bedroc...

Experimental and Large-Eddy Simulation Studies on Three-Dimensional Vortices Produced by an Impinging Transverse Jet

2.04安全科学与技术国际会议

作者： HU Chunlin1 2.LI Kun2.HU Shenggang2.& YANG Zhiyong2.(1 Shanghai institute of applied Mathematics and {2. Shanghai {3. Shanghai 2.0072.China) (2.College of Civil Engineering and Architecture Wuhan {3. of technology Wuhan 43.070 Hubei China)

It is synthetically analyzed about the safety monitoring methods and monitoring results of the stress and strain of the main steel of the raft, deformations of the raft, soil pressures under the raft,

关键词： raft foundation safety monitoring sloping bedrock synthetical analysis

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Experimental and Large-Eddy Simulation Studies on Three-Dime...

The Fifth International Conference on Fluid mechanics

作者： J.Y.Fan~1 Y.Zhang~(2.3. D.Z.Wang~(1 *) 1 Shanghai institute of {2. Mathematics and {2. Shanghai {3. Shanghai 2.0072.China 2.Key Laboratory of Advanced Display and System Applications(Shanghai {3.) Ministry of Education and SMIT Center Shanghai {3. Shanghai 2.0072.China 3.Department of {2. {2. Chalmers {3. of technology SE-412.96 Gothenburg Sweden

＜正＞The flow pattern and entrainment feature of highly three-dimensional vortices produced by an impinging jet in crossflow were investigated by means of LIF flow visualization,PIV measurement and LES *** distinctive vortex modes of the slightly skewed jet shear layer in the proximal region close to jet nozzle are identified mainly depending upon the velocity ratio between the jet and crossflow,namely changing from approximately axisymmetric mode to helical mode with the decreasing velocity ratios varying from 2. to *** the case of intense jet impingement upon the wall,the scarf vortex wrapped around the impinging jet in near-wall region is well reproduced showing somewhat asymmetry in respect of its bilateral spiral legs within near *** addition, the entrainment of the ambient crossflow fluid by the scarf vortex occurs in large part on the surface of the spiral roller structures of itself due to the presence of smaller and unorganized eddies.

关键词： PIV measurement large-eddy simulation impinging jet crossflow vortical structure

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参数激励下圆柱壳的混沌运动

武汉理工大学学报 2010年第9期32卷 233-236页

作者：王建军韩志军崔艳路国运张善元太原理工大学应用力学与生物医学工程研究所太原030024

考虑有限变形,研究了一端固定一端夹支的弹性圆柱壳在轴向参数激励作用下的混沌运动。不计转动惯性和横向剪切变形,通过Hamilton变分原理导出了圆柱壳轴对称变形的动力控制方程。采用Galerkin原理将其转化为二阶三次非线性微分动力系统... 详细信息

考虑有限变形,研究了一端固定一端夹支的弹性圆柱壳在轴向参数激励作用下的混沌运动。不计转动惯性和横向剪切变形,通过Hamilton变分原理导出了圆柱壳轴对称变形的动力控制方程。采用Galerkin原理将其转化为二阶三次非线性微分动力系统。用Runge-Kutta法对其进行数值计算,通过分岔图、位移时程曲线、相平面图和Poincaré映射描述了系统的运动行为。研究表明:外部激励和外部常载荷对微分动力系统的形式有着明显的影响;随着外部激励的变化,系统会出现定常运动和混沌运动;在外部激励连续取值的某一范围内,系统都会出现混沌运动即会出现混沌层现象。

关键词：圆柱壳参数激励混沌

Experimental realization of lower-frequency complete band gaps in 2. phononic crystals

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Experimental realization of lower-frequency complete band ga...

Averaging Analysis of Self-Excited Motion of a Quasi-Axisymmetrical Gyrostat

2.11年全国压电和声波理论及器件应用研讨会

作者： Huan-yu ZHAO~(1,*) Cun-fu He~2.Yue-sheng WANG~1 Bin WU~2.1 institute of Engineering mechanics,Beijing Jiaotong {2.,Beijing 100044 2.College of Mechanical Engineering & {3. Electronics technology,Beijing {2. of technology, Beijing,10012.,

＜正＞The lattice configurations are used to produce the different effects of band *** on the well-known ultrasonic immersion transmission technique,the experimental investigation of acoustic wave propagation in two-dimensional phononic crystals for square,honeycomb and（4.8 ） lattices of steel rods in water is reported at the same normalized *** the plane-wave expansion method we calculate the band structures of phononic ***

关键词： Phononic crystal Lattice configuration Experimental investigation Band gap

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Journal of Shanghai university(English Edition) 2002年第2期6卷 125-129页

作者：薛纭陈立群 ShanghaiinstituteofappliedMathematicsand{2. ShanghaiUniversityShanghai200072China；ShanghaiInstituteofTechnologyCaobaoRoad120Shanghai200233China ShanghaiinstituteofappliedMathematicsandMech

The averaging analysis was carried out to study the motion of a quasi axisymmetrical gyrostat under a small magnitude self excited control torque. The common approach to investigating the problem of rigid body rotation under the action of a small torque known in the body frame was described. Using this approach, the problem (Grammel's problem for the case of small torque) that is maintaining the angular velocity of a quasi axisymmetrical gyrostat using a control torque quadratic in the angular velocity was solved.

关键词： gyrostat self excited motion averaging method phase trajectories.