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Basic models of farfield ship waves in shallow water

Journal of Ocean Engineering and Science 2018年第2期3卷 109-126页

作者： Yi Zhu Jaiyi He Huiyu Wu Wei Li Francis Noblesse State Key Laboratory of Ocean Engineering School of Naval ArchitectureOcean&Civil EngineeringCollaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai Jiao Tong UniversityShanghaiChina

Basic models of the farfield waves created by a monohull ship or a catamaran that travels at a constant speed in calm water of uniform finite depth are considered.A classical basic model is the 1-point ship model introduced by Kelvin in 1887 for deep water and extended to uniform finite water depth by Havelock in *** basic model is the 2-point ship model,which considers the two dominant waves created by the bow and the stern of a monohull ship or by the twin bows of a catamaran,and therefore accounts for main wave interference *** 2-point ship models contain information that cannot be found in the classical patterns for the 1-point ship model commonly used since *** particular,whereas Havelock’s classical wave patterns for the 1-point model only depend on the Froude number based on the water depth,the farfield waves for the 2-point models of a monohull ship or a catamaran also depend on the Froude number associated with the length of the monohull ship or the spacing between the twin hulls of the ***,the‘apparent wake angles’associated with the highest waves that result from constructive wave interferences can greatly differ from the cusp or asymptote angles of Havelock’s wave patterns.

关键词： Farfield ship waves Shallow water ship models Wave interferences

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EXPERIMENTAL STUDY AND NUMERICAL CALCULATION OF HYDRODYNAMIC FORCES AND MOMENTS ACTING ON A HIGH-SPEED TRANSOMSTERN ship RUNNING OBLIQUE TO THE COURSE

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Journal of Hydrodynamics 1991年第1期3卷 1-10页

作者： Fan, Shang-yong Lu, Shao-kang Acad of Naval Engineering Wuhan China

On the basis of oblique towing tests and flow visualizations of ship models, the flow pattern around a high-speed transom-stern ship, its motion attitudes (sinkage and trim) and the characteristics of hydrodynamic forces are analysed. It is concluded that the variation of ship motion attitudes, caused by ship speed, has a great influence over the coefficients of hydrodynamic forces and moments acting on the oblique running ship. ship attitudes related to different speed and drift angles are calculated by Hess-Smith method. By distributing complex singularities over the surface of a double model and by considering separated vortex sheets in the wake at the lee side of the model, pressures and velocities of the fluid around the model may be calculated directly by solving a three-dimensional body with lift problem. The transom stern stream-lines are extended to form a virtual length. In this way, the hydrodynamic lateral forces, yaw moments and pressure distribution are calculated. The results show good agreement with those measured from model tests.

关键词： Flow of Fluids Visualization Mathematical Techniques Matrix Algebra Mechanical Variables Measurement Angles ship models ships Hulls

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ON THE RELATION BETWEEN CAVITATION INCEPTION AND FLOW PATTERN ON PROPELLER BLADES

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Journal of Hydrodynamics 1992年第2期4卷 79-86页

作者： Ji, Zhiye China ship Scientific Research Center Wuxi China

Experimental results of model propeller are obvious different from that of prototype for the stage of cavitation inception, which is called scale effect. The differences in flow pattern between model and full-scale condition can be eliminated using tripping devices at leading edge of model propeller. In this paper, oil flow visualization on the model propeller with and without tripping devices at the leading edge was revealed. The cavitation inception was observed at different Reynolds numbers to examine the dependence of cavitation inception with flow pattern. Detection of cavitation erosion was made and compared the location erosions of model propeller and prototype to investigate cavitation phenomena on the model propeller. The calculations of pressure distribution and the behaviour of boundary layer on the propeller blade were done by theoretical method. For better understanding of cavitation inception, further study is necessary.

关键词： Propellers Cavitation ship models ships Simulators

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Test Study on Current Force on Mooring ships

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China Ocean Engineering 1993年第2期8卷 225-242页

作者： Zhang, Furan Zhao, Jun Zhang, Xueqin Tianjin Research Inst of Water Transport Engineering Tianjin China

In respect of an offshore berthing pillar, the test study result of current force acting on mooring ships is described in this paper. Empirical and semi-empirical relationships of current force coefficient are given according to the angle between the flow direction and the ship's longitudinal axis, which are coincident with the result of theoretical analysis.

关键词： Flow of water Loads (forces) Mathematical models Numerical methods Ocean currents ship models ships

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