渦拡散近似による船の伴流分布の実用計算法について

概要

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Theoretical prediction of ship wake distribution is attempted by the vorticity shedding approximation which plays a key role in the matching method. The wake distributions of three ships with typical hull forms are calculated in order to examine how far the present theoretical prediction is available for practical uses. The computations by the present method are consisting of the potential calculation, the boundary layer caluculation, the diffusion calculation of the vorticity which is generated in the hull surface boundary layer, and the integration of the induced velocity. The velocity on the propeller disk is yielded by the summation of the potential component and the vorticity induced component. Assumptions for the vorticity shedding direction and velocity are employed for the computations in order to be simple and available for the practical uses. The computations are stably carried out without any symptoms of divergence and the computing time is not so lengthy. Though the results for a ship with a stern bulb show poor agreements with experiments, those for the other two models of a tanker model and a container ship model show rather satisfying agreements. A much simpler method based on the present method is proposed which is applicable to the wake prediction at the pre-design stage by the use of the wake distributions of sister ships and also applicable to the scale-up of the model wake.
社団法人日本船舶海洋工学会の論文
1981-08-27