A Theoretical Study on Free-Surface Flow around Slowly Moving Full Hull Forms in Short Waves

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143A theory is described on the free-surface flow slowly moving full hull forms in short waves. Under the assumption of small perturbation over the double body flow, a new function is derived which satisfies the free-surface condition including the effect of deformed flow due to the presence of the ship hull. By using the function, an expression of the velocity potential is introduced. In order to know the basic feature of the present theory, calculations are made of wave pattern generated by a pulsating source moving with constant speed below the free-surface. As a result, it is shown that steep waves appear in the region where a parameter τ_o(= U_oω/9 ; U_o is local velocity of the double body flow, ω, the encounter frequency and 9 the acceleration of gravity) is close to 0.25. The wave pattern shows the similar tendency to the diffraction waves in front of a full hull form observed by Ohkusu^<11)>.
社団法人日本船舶海洋工学会の論文