斜航流体力の物理的成分分離による数学モデル : 主船体および上部構造

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When advancing slowly, a ship's motion is largely affected by any existing external forces, for example wind force, resulting in drifting at angles which vary from small to large. Accordingly, when simulating ship maneuvering motion in wind, the hydrodynamic lateral force Y, the yaw moment N and the longitudinal force X, varying largely with the ship's drift angle, and also the aerodynamic forces varying with wind direction, should be describable by simple and accurate mathematical models covering all ranges of drift angle or wind direction. Furthermore it is desirable for the mathematical model to be a physical model based on hydro or aerodynamics. This paper separates fluid from ideal force (Munk moment), lift and induced drag forces due to viscosity, cross flow drag force, and frictional drag force. As the result, logitudinal force X, lateral force Y and yaw moment N of the fluid dynamic force acting on ship are described by the following mathematical model. [numerical formula] where [numerical formula] and U: fluid speed β: drift angle S_w: wetted surface area S: lateral projected area C_<f0>: frictional resistance's coefficient of flat plate k_e: form factor x',d': longitudinal position and draft of ship's section u': longitudinal speed(=u/U=cosβ) v': lateral speed(=v/U=-sinβ) m_x・m_y: added mass coefficients C_<D90>: cross flow drag coefficient at β=90° 1/2ρ・S・U^2: nondimensionalizing factor of forces C'_L: derivative of lift force C'_<Di>: derivative of induced drag force ΔC'_L,ΔC'_<Di>: coefficients of stall
社団法人日本船舶海洋工学会の論文
1990-03-25

斜航流体力の物理的成分分離による数学モデル : 主船体および上部構造

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