Abstract
For the numerical calculation of ship maneuvering motion including the effect of non-uniformity of the current, it is necessary to obtain the distribution of hydrodynamic lateral forces along the ship's length. A new method proposed in this paper to determine this distribution along the ship's length is based on (1) the application of a wing theory for the linear force and (2) the use of the so-called cross-flow model for the non-linear force. Through the computations of ship turning motion in a shear flow and the comparison of the results with corresponding existing methods, it is found that the new method gives a reasonable yaw rate of a ship at the moment she enters or leaves the shear-flow region. By using this new method with a simple mathematical model for the rudder control by the helmsman, the safety maneuvering in Naruto Kaikyou is studied. An emphasis is mainly placed on the effects of non-uniform tidal current on the course-keeping ability of a ship. The effect of wind force is also investigated on the assumption that the wind is steady and uniform.
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