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ANALYTICAL SOLUTIONS FOR THE SLOSHING LOADING ON CIRCULAR CYLINDRICAL LIQUID TANKS WITH INTERIOR SEMI-POROUS BARRIERS

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Journal of Hydrodynamics 2001年第2期13卷 32-39页

作者： Miao, G.P. Ishida, H. Saitoh, T. Kurosaki, K. sch. of naval arch. and ocean eng. Shanghai Jiaotong Univ. Shanghai 200030 China

The estimation of sloshing loading on liquid tanks is of fundamental importance due to the wide and important applications of liquid tanks in various eng.neering aspects. Analytical solutions for the sloshing loading on circular cylindrical liquid tanks with an interior concentric vertical thin semi-porous barrier under external excitations are presented. And the extensions of the solutions to the elastic vibrations and to the high frequency limit to count for the earthquake response are also included. A clear view on the influence of semi-porous barriers to the sloshing response of oscillating tanks is obtained by the analyses of systematic computational results. The present results may offer guidance to the corresponding design for liquid tanks of various applications and also a basis of comparison for the development of more sophisticated numerical methods for hydrodynamic and hydro-elastic analyses.

关键词： Boundary conditions Mathematical models Tanks (containers) Vibration measurement

NUMERICAL SIMULATION OF TIP-CLEARANCE FLOW IN CASCADE

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Journal of Hydrodynamics 2003年第1期15卷 62-66页

作者： Chen Long, Yang Chen jun, Wang Guo qiangsch.ol of naval arch.tecture and ocean eng.neering, Shanghai Jiaotong University, Shanghai 200030, China sch. of naval arch. and ocean eng. Shanghai Jiaotong Univ. Shanghai 200030 China

The tip-clearance flow in a cascade was numerically simulated by solving theRANS equations of incompressible fluids. The computational model was based upon the artificialcompressibility formulation proposed by Chorin. The Baldwin-Lomax turbulence model was used to makethe governing equations closed. For the specific structure of tip-clearance flow, a multi-block gridstructure was adopted to facilitate numerical compulations. The comparison of numerical resultswith experimental data indicates that the present method is capable of simulating tip-clearanceflows with satisfactory accuracy.

关键词： cascade flow tip-clearance flow multi-block grid structure

Dynamic Analysis of a Turret-Moored Tanker

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China ocean eng.neering 2000年第1期15卷 103-112页

作者：范菊陈小红季春群 sch. of Nav. arch. and ocean eng. Shanghai Jiaotong University (SJTU) Shanghai 200030 China

In this paper, the second-order perturbation method in frequency domain is used to calculate RAO and spectra of motion and mooring line tension of a turret-moored tanker in ballast condition. The calculated results are compared with corresponding experiment results. In the experiment the wave heading is 180 degrees, and the wave spectra is the P-M spectrum and white noise spectrum. In the theoretical calculations, the damping coefficient of slow oscillation of the tanker is determined on the basis of the damping obtained from a test of irregular waves where the mooring system is replaced by a nonlinear spring with nonlinear stiffness similar to that of the mooring system. From the comparison between theoretical calculations and experiment al results, it can be found that the theoretical results obtained by the second-order perturbation method in frequency domain are in good agreement with the experimental results, indicating that the damping coefficient of slow oscillation of the tanker required in frequency domain calculation can be determined by reference to the damping coefficient of the tanker moored by a spring system in irregular waves, and the second-order perturbation method can be used to analyze the dynamic response of a turret-moored tanker.

关键词： turret-moored tanker dynamic analysis second-order perturbation

Economic Analysis of Energy-efficient Buildings in China

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Journal of Shanghai Jiaotong university(Science) 2007年第5期12卷 673-679页

作者：胡昊杨志明 sch.ol of naval arch. Ocean & Civil Eng.Shanghai Jiaotong Univ.

Applying energy-saving measures in residential buildings is usually constrained by the increase of initial investment. ＂However, if it is analyzed from the view of energy cost and life-cycle cost, the energy-saving benefit can offset ~he increase of initial investment. An analysis method based on life-cycle concept was developed to calcu- late the energy cost of residential building flats. Several uncertain factors were included into the model, making it more accurate to reflect practical situation. The model was solved using the software DeST and applied to one resi- dential building project in Shanghai. The case study shows that the initial investment （cost） is paid back during the operational phase through less consumption of energy. It further indicates that the investment recovery period is between 10 and 19 years which are acceptable to households and developers in China.

关键词： energy-saving energy cost life cycle analysis energy simulation

Vortex Patterns and Roll Damping on Various Cross Sections of Ships

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China ocean eng.neering 2000年第2期15卷 185-192页

作者：张怀新刘应中缪国平 sch. of Nav. arch. and ocean eng. Shanghai Jiao Tong University Shanghai 200030 China

A numerical study is presented on roll damping of ships by solving Navier-Stokes equation. Two Dimensional unsteady incompressible viscous flow around the rolling cylinders of various ship-like cross sections are numerically simulated by use of the computational sch.me previously developed by the authors. The numerical results show that the location of the vortices is very similar to the existing experimental result. For comparison of vortex patterns and roll damping on various ship-like cross sections, various distributions of shear stress and pressure on the rolling ship hull surface are presented in this paper. It is found that there are two vortices around the midship-like section and there is one vortex around the fore or stern section. Based on these simulation results, the roll damping of a ship including viscous effects is calculated. The contribution of pressure to the roll moment is larger than the contribution of frictional shear stress.

关键词： viscous flow numerical simulation vortex pattern roll damping

EXPERIMENTS OF HYDRODYNAMICS AND STABILITY OF IMMERSED TUBE TUNNEL ON TRANSPORTATION AND IMMERSING

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Journal of Hydrodynamics 2001年第2期13卷 121-126页

作者： Zhan, D.X. Wang, X.Q. Dept. of naval arch. and ocean eng. Wuhan Univ. of Technol. Wuhan 430063 China

Effects of environment conditions, such as current, wave etc., are more important for immersed tube tunnel's transportation and immersing. The hydrodynamics and stability of immersed tube tunnel during its towing and immersing are interested for departments of design and construction. A serial model tests are made in towing tank and water channel for Nanjing immersed tube tunnel, and the first immersed tunnel has been designed in Yangtzi River in China. The hydrodynamic forces and rope tensions of the tunnel are measured with strain balances when it is towed by ship and immersed by winches for a different current velocity and wave height. In addition, the stability of tunnel for a different ballast water is tested and discussed.

关键词： Hydrodynamics Stability Tensile testing Test facilities

HYDRODYNAMIC ANALYSIS OF SHORELINE OWC TYPE WAVE ENERGY CONVERTERS

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Journal of Hydrodynamics 2002年第1期14卷 8-15页

作者： Wang, Dong-Jiao Katory, Mahmoud Bakountouzis, Lambros Dept. of naval arch. and ocean eng. South China Univ. of Technol. Guangzhou 510640 China

A numerical model to predict the hydrodynamic performance of a shoreline-mounted wave energy converter, normally referred to as Oscillating Water Column (OWC), was established. Based on the 3D boundary integral equation method, the 3D Green's function was utilized to describe the hydrodynamic flow around the device. Using geometrical data of a wave absorber device symmetrically placed in a channel with various barrier depths, the hydrodynamic efficiencies were calculated for regular waves. The results were then compared with analytical results published elsewhere Malmo[8]. And the comparison is shown to be good, thus validating the proposed numerical model. Furthermore, extensive experiments were also made in a wave tank with a 1:12 scale model of an OWC device of different geometrical configurations. The experimental measurements were compared with calculations using the newly developed numerical model. The comparison, which is also shown to be satisfactory, provides further support of the correctness and the accuracy of the numerical method presented.

关键词： Hydrodynamics Mathematical models

A Precise Integration Method for Linear Viscoelastic Solid

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Journal of Shanghai Jiaotong university(Science) 2005年第1期10卷 57-60页

作者：刘靖华吴长春黄若煜 sch.ol of naval arch. Ocean & Civil Eng.Shanghai Jiaotong Univ. Shanghai 200030China

This paper presented a new convenient method for viscoelastic problems which are generally solved through complex Laplace transform. State space equation is derived from the differential form of constitutive equation of linear viscoelastic solid that can be solved by a precise integration method which is used in many fields with the advantages of high precision and convenience. For linear viscoelastic solids and crack, the finite elements program of the precise integration method is developed, which appears to be efficient and precise.

关键词： precise integration viscoelastic finite element

Probabilistic Distribution of Ice Forces on a Solitary Pile in the Liaodong Bay

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China ocean eng.neering 1996年第1期11卷 65-70页

作者： Wang Yonggang Shi Qingzeng.Postgraduate, Tianjin University, Tianjin 300072 Professor, Dept. of ocean eng. and naval arch., Tianjin Univ., Tianjin 300072 Tianjin University Tianjin 300072 Dept. of ocean eng. and naval arch. Tianjin Univ. Tianjin 300072

The level ice thickness and compressive streng.h at the four measuring stations in the Liaodong Bay are inferred according to the hydrologic and meteorologic data there, then the yearly extreme ice forces on a solitary pile are calculated by the use of appropriate formula of ice forces and its probabilistic distribution is determined. Generally, the yearly extreme ice force follows Weibull distribution best as compared with Normal, Lognormal, and Extreme Value I distribution. On the other hand, the short-term distribution of ice forces on a solitary pile is obtained from the model experiment data analysis: It does not refuse Extreme Value I distribution.

关键词： solitary pile ice forces yearly extreme value distribution short-term distribution