斜波中非線形船体運動/波浪荷重の時間領域における数値計算法に対する一考察

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It is well known that if numerical time domain simulations are performed with the equations of sway-yaw-roll motions of a ship in oblique waves, the solutions of sway and/or yaw motions are drifting in process of time steps. Because of the coupling effects of the equations, this drifting affects other modes of motions badly, and the steady state solutions cannot be obtained even in the case of regular waves. This fact is emphasized in calculations of wave loads. When the nonlinearity of the fluid forces acting on a ship's hull is to be taken into account, numerical simulations in time domain are inevitable and a special care is necessary to perform such simulations because of abovementioned drifting. Since this drifting is not physical one but purely numerical one, which is dominated by the eigenvalues of the equations of motions, it would be necessary to eliminate the drifting solutions from numerical simulations. In the present paper, a scheme, in which the digital filter technique is applied, is proposed to eliminate drifting solutions and obtain steady state solutions in the process of numerical simulations of nonlinear ship motions and wave loads in regular oblique waves. Example calculations are performed for a high-speed container ship using this scheme. Calculated results show that the proposed scheme is effective to obtain stable solutions in the calculation of ship motions and wave loads in regular oblique waves.
社団法人日本船舶海洋工学会の論文

斜波中非線形船体運動/波浪荷重の時間領域における数値計算法に対する一考察

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