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Observations and computations of narrow Kelvin ship wakes

Journal of Ocean Engineering and Science 2016年第1期1卷 52-65页

作者： Francis Noblesse Chenliang Zhang Jiayi He Yi Zhu Chenjun Yang Wei Li State Key Laboratory of Ocean Engineering School of Naval ArchitectureOcean&Civil EngineeringShanghai Jiao Tong UniversityShanghaiChina

Computations of far-field ship wave.,based on linear potential flow theory and the Hogner approximation,are reported for monohull ships and ***,far-field ship wave. are computed for six monohull ships at four Froude numbers F≡V/√gL=0.58,0.68,0.86,1.58 and for six catamarans with nondimensional hull spacing s≡S/L=0.25 at two Froude numbers F s≡V/√gS=1 and ***,g is the gravitational acceleration,V and L denote the ship speed and length,and S is the separation distance between the twin hulls of a *** computations show that,although the amplitudes of the wave. created by a ship are strongly influenced by the shape of the ship hull,as well known,the ray angles where the largest wave. are found are only weakly influenced by the hull shape and indeed are mostly a kinematic feature of the flow around a ship *** important practical consequence of this flow feature is that the apparent wake angle of general monohull ships or catamarans(with arbitrarily-shaped hulls)can be estimated,without computations,by means of simple analytical relations;these relations,obtained elsewhere via parametric computations,are given ***,the influence of the two parameters F s and s that largely determine the ray angles of the dominant wave. created by a catamaran is illustrated via computations for three catamarans with hull spacings s=0.2,0.35,0.5 at four Froude numbers F s=1,1.5,2,*** computations confirm that the largest wave. created by wide and/or fast catamarans are found at ray angles that only depend on F s(*** do not depend on the hull spacing s)in agreement with an elementary analysis of lateral interference between the dominant wave. created by the bows(or sterns)of the twin hulls of a *** dominant-wave. ray angles predicted by the theory of wave.interference effects for monohull ships and catamarans are also compared with the observations of narrow Kelvin ship wakes reported by Rabaud and Moisy,and found to be cons

关键词： Kelvin wake Narrow ship wake Monohull ship Catamaran wave.interference Bow wave stern wave.

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