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首页> 外文会议>International Conference on Offshore Mechanics and Arctic Engineering 2007(OMAE2007) vol.4; 20070610-15; San Deigo,CA(US) >THREE-DIMENSIONAL LARGE AMPLITUDE BODY MOTIONS IN WAVES
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THREE-DIMENSIONAL LARGE AMPLITUDE BODY MOTIONS IN WAVES

机译：波浪中的三维大人体运动

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摘要

Three-dimensional, time-domain, wave-body interactions are studied in this paper for cases with and without forward speed. In the present approach, an exact body boundary condition and linearized free surface boundary conditions are used. By distributing desingularized sources above the calm water surface and using constant-strength panels on the exact submerged body surface, the boundary integral equations are solved numerically at each time step. Once the fluid velocities on the free surface are computed, the free surface elevation and potential are updated by integrating the free surface boundary conditions. After each time step, the body surface and free surface are regrided due to the instantaneous changing submerged body geometry. The desingularized method applied on the free surface produces non-singular kernels in the integral equations by moving the fundamental singularities a small distance outside of the fluid domain. Constant strength panels are used for bodies with any arbitrary shape. Extensive results are presented to validate the efficiency of the present method. These results include the added mass and damping computations for a hemisphere. The calm water wave resistance for a submerged spheroid and a Wigley hull are also presented. All the computations with forward speed are started from rest and proceed until a steady state is reached. Finally, the time-domain forced motion results for a modified Wigley hull with forward speed are shown and compared with the experiments for both linear computations and body-exact computations.
机译：本文研究了具有正向速度和不具有正向速度的情况下的三维时域波体相互作用。在本方法中，使用精确的身体边界条件和线性化的自由表面边界条件。通过在平静水面以上分布去单一源，并在确切的淹没水体表面上使用恒定强度面板，可以在每个时间步数值求解边界积分方程。一旦计算了自由表面上的流体速度，就可以通过积分自由表面边界条件来更新自由表面的高度和电势。在每个时间步骤之后，由于瞬时变化的浸入式车身几何形状，车身表面和自由表面会重新磨碎。通过将基本奇异点移到流体域之外一小段距离，在自由表面上应用的去奇点方法会在积分方程中产生非奇异内核。等强度面板用于任何形状的车身。提出了广泛的结果以验证本方法的效率。这些结果包括半球的附加质量和阻尼计算。还介绍了水下球体和Wigley船体的平静水波阻力。所有具有正向速度的计算都从静止开始，继续进行直到达到稳定状态。最后，显示了改进的Wigley船体具有前进速度的时域强制运动结果，并将其与线性计算和精确人体计算的实验进行了比较。

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