渦システムによる造波グリーン関数を挿入した定常揚力面の数値解析(その2) : 抗力成分の算定

概要

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In this paper, components of the drag force which acts on the hydrofoil are evaluated by momentum theorem taking account of the wave generation and the trailing vortices. Then, it is possible to compute the total drag without the interference of induced drag and wave-making resistance as far as vortex model has normal image system which satisfies the rigid wall conditions at the free surface. Also, it was shown that the lifting line approximation for calculating wave-making resistance is not valid in the case of low speed by using of wave amplitude functions of lifting surface. And, asymptotic behavior of wave pattern generated by vortex system at the high speed is analyzed. As a result, flow field is represented by inverse image system and above-mentioned approximation is useful for the limiting case of high speed.