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Modelling of multi-bodies in close proximity under water waves——Fluid resonance in narrow gaps

Science China(Physics,Mechanics & Astronomy) 2011年第1期54卷 16-25页

作者： Lu Lin1,2.TENG Bin3,CHENG Liang 4,SuN Liang5 & CHEN XiaoBo6 1 Center for Deepwater engineering,Dalian university of Technology,Dalian 11602.,China 2.State key Laboratory of Structural Analysis for Industrial Equipment,Dalian university of Technology,Dalian 11602.,China 3 State key Laboratory of Coastal and Offshore engineering,Dalian university of Technology,Dalian 11602.,China 4 School of civil and Resource engineering,The university of Western Australia,Crawly 6003,Australia 5 centre for Offshore Research and engineering,Department of civil engineering,National university of Singapore,117576,Singapore 6 Research Department,Bureau Veritas,Neuilly-Sur-Seine,92.70,France Center for Deepwater engineering Dalian University of Technology Dalian China State key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian China State key Laboratory of Coastal and Offshore engineering Dalian University of Technology Dalian China School of civil and Resource engineering The University of Western Australia Crawly Australia centre for Offshore Research and engineering Department of Civil Engineering National University of Singapore Singapore Singapore Research Department Bureau Veritas Neuilly-Sur-Seine France

Viscous fluid model and potential flow model with and without artificial damping force(f=-μV,μ the damping coefficient and V the local averaging flow velocity) are employed in this work to investigate the phenomenon of fluid resonance in narrow gaps between multi-bodies in close proximity under water *** numerical results are compared with experimental data available in the *** comparison demonstrates that both the viscous fluid model and the potential flow model are able to predict the resonant frequency reasonably *** the conventional potential flow model(without artificial damping term) significantly over-predicts the wave height in narrow gaps around the resonant *** order to calibrate the appropriate damping coefficient used for the potential model and make it work as well as the viscous fluid model in predicting the resonant wave height in narrow gaps but with little computational efforts,the dependence of damping coefficient μ on the body geometric dimensions is examined considering the parameters of gap width Bg,body draft D,body breadth ratio Br and body number n(n = 2.3),where Br = BB/BA for the case of two bodies(Body A and Body B) with different breadths of BA and BB,*** was confirmed that the damping coefficient used for the potential flow model is not sensitive to the geometric dimensions and spatial *** was found that μ∈ [0.4,0.5] may guarantee the variation of Hg/H0 with kh to be generally in good agreement with the experimental data and the results of viscous fluid model,where Hg is the excited wave height in narrow gaps under various dimensionless incident wave frequencies kh,H0 is the incident wave height,k = 2./L is the wave number and h is the water depth.

关键词： narrow gap fluid resonance water wave viscous fluid model potential flow model finite element method boundary element method

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Communications in Nonlinear Science and Numerical Simulation 1999年第3期4卷 186-190页

作者： Guoqian CHEN and J. H. W. LEE(centre for Environmental Sciences, Peking university, Beijing 100871, China) (Department of {2. engineering, university of Hong kong, Hong kong, China) centre for Environmental Sciences Peking University Beijing 100871 China Department of civil engineering University of Hong Kong Hong Kong China

IntroductionThethermal,abodyofbuoyalfluidinafluidwithwhichitcanmixandgivennamebygliderpilotstothosemassesofwarmairrisingfromhotgroundwarmedbysunshineinwhichtheycansoar,***],duetoi... 详细信息

IntroductionThethermal,abodyofbuoyalfluidinafluidwithwhichitcanmixandgivennamebygliderpilotstothosemassesofwarmairrisingfromhotgroundwarmedbysunshineinwhichtheycansoar,***],duetoi...

关键词： environmental fluid mechanics thermal turbulence modeling

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Excited response of granular ores in vibrating field

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Journal of Central South university of Technology 2001年第2期8卷 120-124页

作者： LI Jian hua 1,2., SuN Ye zhi 1, Wu Ai xiang 1, CHEN Shou ru 1 (1.College of Resources, Environment and civil engineering, Central South {2., Changsha 410083, China 2.The 5th Building Company in Guangdong Province, Shaoguan 512.2., C College of Resources Environment and Civil Engineering Central South University Changsha China The 5th Building Company in Guangdong Province Shaoguan China

The dynamical theory was utilized to probe into the law of the excited response of granular ores generated by the exciting action of exciter and the influence of wave propagation in vibrating field. The exciter with double axes was presented as an example, and the principle of exciter and its mathematical expression of the excitation force were given. The granular ores have viscidity and damping speciality, on the basis of which the motion equation of excited response of ores was established and the approximate expression of mode displacement by harmonic excitation and the steady effect solution of coordinate response were deduced. utilizing the step by step integration method, the recursion relation matrix of displacement, velocity and acceleration of the excited response of ores were obtained, and the computational flow chart and a computational example were given. The results show that the excited response can change the dynamical character and the flowing characteristic of granular ores.

关键词： excitation system excited response granular ore step by step integration method

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双肢薄壁高墩施工过程稳定性分析的快速算法

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铁道学报 2004年第5期26卷 86-90页

作者：李开言陈政清韩艳中南大学土木建筑学院湖南长沙410075 湖南大学土木工程学院湖南长沙410082

根据能量原理,推导了双肢薄壁高墩在施工荷载作用下静力稳定系数的代数表达式。算例分析表明,运用本文推导的稳定系数表达式计算结果与ANSYS有限元计算结果非常相近。本文方法运用方便、准确性高,具有很高的现场应用价值。

关键词：双肢薄壁高墩稳定分析能量原理

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Generating function approach to reliability analysis of structural systems

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Science China(Technological Sciences) 2009年第10期52卷 2849-2858页

作者： ZHOu JinYu1 & XIE LiYang2.1 Jiangsu Teacher’s university of Technology, Changzhou 2.3001, China 2.Northeastern university, Shenyang 110004, China Jiangsu Teacher’s university of Technology Changzhou China Northeastern university Shenyang China

The generating function approach is an important tool for performance assessment in multi-state systems. Aiming at strength reliability analysis of structural systems, generating function approach is introduced and developed. Static reliability models of statically determinate, indeterminate systems and fatigue reliability models are built by constructing special generating functions, which are used to describe probability distributions of strength (resistance), stress (load) and fatigue life, by defining composite operators of generating functions and performance structure functions thereof. When composition operators are executed, computational costs can be reduced by a big margin by means of collecting like terms. The results of theoretical analysis and numerical simulation show that the generating function approach can be widely used for probability modeling of large complex systems with hierarchical structures due to the unified form, compact expression, computer program realizability and high universality. Because the new method considers twin loads giving rise to component failure dependency, it can provide a theoretical reference and act as a powerful tool for static, dynamic reliability analysis in civil {2. structures and mechanical equipment systems with multi-mode damage coupling.

关键词： structure reliability generating function static strength failure fatigue failure failure dependence

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Advances in numerical methods for the solution of population balance equations for disperse phase systems

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Science China Chemistry 2009年第8期52卷 1063-1079页

作者： Su JunWei1,Gu ZhaoLin2.3 & Xu X.Yun41 Department of Mechanical engineering and Automation,School of Mechanical engineering,Xi’an Jiaotong {2.,Xi’an 710049,China 2.key Laboratory of Mechanics on Disaster and Environment in Western China,Ministry of Education,Lanzhou 730000,China 3 Department of Environmental Science and Technology,School of Human Settlements and civil engineering,Xi’an Jiaotong {2.,Xi’an 710049,China 4 Department of Chemical engineering,Imperial College London,London SW7 2.Z,uk Department of Mechanical engineering and Automation School of Mechanical Engineering Xi’an Jiaotong University Xi’an China key Laboratory of Mechanics on Disaster and Environment in Western China Ministry of Education Lanzhou China Department of Environmental Science and Technology School of Human Settlements and Civil Engineering Xi’an Jiaotong University Xi’an China Department of Chemical engineering Imperial College London London UK

Accurate prediction of the evolution of particle size distribution is critical to determining the dynamic flow structure of a disperse phase system.A population balance equation(PBE),a non-linear hyperbolic equation of the number density function,is usually employed to describe the micro-behavior(aggregation,breakage,growth,etc.) of a disperse phase and its effect on particle size *** solution is the only choice in most *** this paper,three different numerical methods(direct discretization methods,Monte Carlo methods,and moment methods) for the solution of a PBE are evaluated with regard to their ease of implementation,computational load and numerical *** attention is paid to the relatively new and superior moment methods including quadrature method of moments(QMOM),direct quadrature method of moments(DQMOM),modified quadrature method of moments(M-QMOM),adaptive direct quadrature method of moments(ADQMOM),fixed pivot quadrature method of moments(FPQMOM),moving particle ensemble method(MPEM) and local fixed pivot quadrature method of moments(LFPQMOM).The prospects of these methods are discussed in the final section,based on their individual merits and current state of development of the field.

关键词： population balance equation direct discretization method Monte Carlo method moment methods disperse phase system

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Study on multi-scheme analysis and evaluation method for concrete sequence placement of high arch dam

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Science China(Technological Sciences) 2011年第S1期54卷 47-53页

作者： ZHONG GuiLiang,REN BingYu & TONG DaWei Department of Hydraulic and Hydroelectric engineering,School of civil engineering,Tianjin university,Tianjin 300072.China Department of Hydraulic and Hydroelectric engineering School of Civil Engineering Tianjin University Tianjin China

A complete scheme for solving the key scientific problems of how to make concrete sequence placement scheme of high arch dam reasonable and feasible and how to meet the need of construction process was ***,based on a coupling analysis of concrete sequence placement system of high arch dam,a mathematical model considering complex construction constraints was ***,a multi-scheme computational analysis method for concrete sequence placement of high arch dam was proposed based on dynamic ***,a multi-scheme evaluation method for concrete sequence placement was put forward based on analytic hierarchy ***,feedback guidance for progress control and management in the high arch dam construction process was ***,these methods were applied to a practical project to show that the methods can analyze and evaluate multi-scheme for concrete sequence placement of high arch dam effectively,optimize the process of dam concrete sequence placement,and recommend engineering *** methods provide new theoretical principles and technical measures for real-time progress control in the high arch dam construction.

关键词： sequence placement analysis multi-scheme evaluation dynamic simulation analytic hierarchy process high arch dam construction

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THE TRANSFORMED NONPARAMETRIC FLOOD FREQuENCY ANALYSIS

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Journal of computational Mathematics 1994年第4期12卷 330-338页

作者： kaz Adamowski(Department of civil engineering {2. of Ottawa, Ottawa, Canada)Wojciech Feluch(Institute of Environmental engineering , Technical {2. of Warsaw, Warsaw, Poland) university of Ottawa 加拿大 Technical university of Warsaw 波兰

The nonparametric kernel estimation of probability density function (PDF) pro-vides a uniform and accurate estimate of flood frequency-magnitude ***, the kernel estimate has the disadvantage that the smoothing factor h is estimate empirically and is not locally adjusted, thus possibly resulting in deteri oration of density estimate when PDF is not smooth and is heavy-tailed. Such a problem can be alleviate by estimating the density of a transformed random vari able, and then taking the inverse transform. A new and efficient circular transform is proposed and investigated in this paper

关键词： TRT Res THE TRANSFORMED NONPARAMETRIC FLOOD FREQuENCY ANALYSIS

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Optimization of Regulation Valve Location for Heating System

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湖南大学学报（自然科学版） 2009年第S1期36卷 88-90页

作者： LIu Ling-ling,CHEN Hong-bing,LI De-ying(School of Environment and Energy engineering,Beijing university of {2. engineering and Architecture,Beijing 100044,China) School of Environment and Energy engineering Beijing University of Civil Engineering and Architecture Beijing 100044 China

This paper mainly studied how to determine the best location of the self-operated flow control valve at the heating system *** the location of regulating valve directly affects the pipe network performance,the simulation and analysis of pressure change in heating system was carried out with computational Fluid Dynamics(CFD)*** study shows the best location of regulating valve varies with the change of the supply and return pipe length when the heating area of each user is small,and when the heating area of each user is large(2.000 000～3 000 000 m2.,the best location is on the supply pipe.

关键词： regulating valve optimization CFD simulation

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EFFECTS OF WATER-DEPTH ON HYDRODYNAMIC FORCE OF ARTIFICIAL REEF

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Journal of Hydrodynamics 2007年第3期19卷 372-377页

作者： MIAO Zhen-qing XIE Yong-he College of Environmental Science and engineering Ocean University of China Qingdao 266003 China School of Naval Architecture and civil engineering Zhejiang Ocean University Zhoushan 316004China School of Naval Architecture and civil engineering Zhejiang Ocean University Zhoushan 316004 China

The effects of water-depth on the hydrodynamic force of the artificial reef were studied by simulating regular and irregular waves. The computational results show that the water-depth has a substantial effect on hydrodynamic force. The hydrodynamic force increases with the decrease of water-depth in shallow. Especially, in the ultra-shallow water these loads increase very evidently with the decrease of water-depth. The long-term values of hydrodynamic force increase with the decrease of the ratio of water-depth to reef height, and are about 10% larger than those of deep water when the ratio of water-depth to reef height is 4.0. However water-depth hardly affects the long term values of hydrodynamic force when the ratio of water-depth to reef height is larger than 6.0.

关键词： artificial reef water-depth hydrodynamic force

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