時間領域ハイブリッド法による波浪中船体運動および抵抗増加の推定

概要

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A time-domain hybrid method developed by authors is applied to estimate motions and added wave resistance of ships advancing in waves. The fluid domain around a ship is decomposed into the near field and the far field, and the Rankine panel method and the Green function method are applied in each field. Combining both solutions on the artificial surface makes it possible to satisfy the radiation condition exactly and to take the nonlinearities of ship motions and the free-surface into account. The estimation accuracy of the method has been already confirmed in regard to hydrodynamic forces and wave fields in the previous studies. In this paper, we apply the method to simulate ship motions in regular head waves and also to estimate added wave resistance for four ships; two modified Wigley models, Series-60(C_b=0.6) and Series-60(C_b=0.8). The computed results are compared with experimental results and another numerical results by the strip method and the enhanced unified theory. Through the comparison, it is confirmed that the present hybrid method can estimate ship motions and added wave resistance with high accuracy for any cases.