横揺れおよび左右揺れする船の減衰力に及ぼす粘性影響について

概要

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This paper deals with the viscous effects on forces and moments acting on a ship in sway and roll motion at zero forward speed. Through the forced swaying tests, it is found that the sway damping of a ship with bilge keels in moderate sway amplitude may be estimated well by the potential-flow theory. The roll damping and coupling terms in velocity-phase of roll into sway and of sway into roll, however, are affected considerably by the viscosity of fluid. A method for estimating the roll damping was proposed in our previous papers. In the present paper, the methods for predicting the coupling terms in velocity-phase of sway into roll and of roll into sway are obtained on almost the same assumptions as those that we used in deriving the prediction method of roll damping of ships. The values predicted by the present methods are in fairly good agreement with the experimental ones.
社団法人日本船舶海洋工学会の論文
1980-03-30