船体に働く流体力に及ぼす傾斜底の影響

概要

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The bank effect has been known as an important factor on the ship manoeuvrability in confined waters such as harbors or canals. In the previous paper, the hydrodynamic force acting on a ship in the proximity of a nonuniform but vertical-sided bank wall was examined by using a calculation method based on the slender body theory. In this paper, we apply the calculation method to the case of a slope bank. The characteristics of the hydrodynamic force acting on the ship due to the inclined sea bed are discussed. From the calculation results the effect of the slope bank on hydrodynamic force will be a very significant factor, especially when compared with that of the vertical-sided bank wall. The inclined sea bed induces a lange lateral force which pulls the ship towards the beach and a yaw moment which turns the bow towards the coast at small water depths but turns the bow away from the coast as the water depth increases. Even when the ship is far from the coast the hydrodynamic force due to the inclined sea bed is found to be having similar characteristics if the clearance between the ship and the sea bed is small enough.
社団法人日本船舶海洋工学会の論文
1990-03-15