水面衝撃解析の歴史は古く,平板近似による速度ポテンシャルを用いたWagnerの理論は物体上の水圧分布を水面の盛り上がりを考慮して簡単に推定できる方法として広く用いられている.遠山はWagnerの理論を楔型物体以外のより一般的な形状物体に適用できるよう拡張した.境界要素法は任意形状物体に適用できるの数値解析法の一つとしてこれまでにも数多くの研究が報告されてきた.%The paper describes the boundary element analysis method for the water impact of an arbitrarily shaped section. Computational method for the nonlinear solution, which is the initial condition of the free surface for the simulation of the fully-nonlinear wave-body interactions, is proposed. For stable computation on the water impact problem, the time-step division and the element length are decided in a practical manner. Computational treatment of the intersection of the free surface with the body is discussed and the numerical technique is proposed for the simulation of nonviscous flow separation.
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