非定常造波問題における波核関数の時間領域ハイブリッド法による計算

概要

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A time-domain computation method which based on the hybrid method is originally developed and applied to the unsteady wave making problems. The fluid domain is decomposed into the near field and the far field, and the space-fixed control surface is employed to separate them. The Rankine panel method and the Green function method are applied to two domains respectively and the solutions in both domains are combined on the control surface. The former makes the present method flexible to the free-surface condition and later guarantees the radiation condition. The use of the space-fixed control surface makes the theory free from the line-integral which usually appears at the intersection between the free-surface and the control surface. The numerical simulation is performed simplifying the complicated ship motions by a pulsating point source. Through the comparisons between the present numerical results and analytical solution which obtained by the wave source function, it is shown that the radiation condition is mostly satisfied. Furthermore, computations for a variety of the panel arrangement for the control surface and the free surface are carried out, and the relation between the radiation condition and the panel arrangement is discussed in detail.
社団法人日本船舶海洋工学会の論文
2004-08-31