Time-Domain Simulations of Radiation and Diffraction Forces
Time-Domain Simulations of Radiation and Diffraction Forces
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DOI：
10.5957/jsr.2010.54.2.79
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发表时间：
2010-06
影响因子：
1.4
通讯作者：
Xinshu Zhang;P. Bandyk;R. Beck
中科院分区：
文献类型：
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作者：
Xinshu Zhang;P. Bandyk;R. Beck
本文研究了具有正向速度问题的大振幅、时域、波体相互作用。通过大量的数值模拟，对二维带钢理论和三维带钢计算方法进行了比较。该方法采用精确体边界条件和线性化自由曲面边界条件。通过在平静水面上布设非规格化源，在精确水面上使用等强度平板，在每个时间步上对边界积分方程进行数值求解。条形理论方法采用径向基函数来逼近物体上速度势的纵向导数。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程和势。在每个时间步之后，由于湿体几何形状的瞬时变化，对体表和自由体表进行了重新划分。大量的实验结果验证了本文方法的有效性。这些结果包括使用二维和三维方法计算Wigley III型船体和S-175型船体在前进速度下的附加质量和阻尼。采用全三维方法和二维条形理论，得到并比较了Wigley III型船体在规则头浪作用下的激振力。所有计算结果都与实验或其他数值解进行了比较。
Large-amplitude, time-domain, wave-body interactions are studied in this paper for problems with forward speed. Both two-dimensional strip theory and three-dimensional computation methods are shown and compared by a number of numerical simulations. 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 flat panels on the exact body surface, the boundary integral equations are solved numerically at each time step. The strip theory method implements Radial Basis Functions to approximate the longitudinal derivatives of the velocity potential on the body. 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 wetted body geometry. Extensive results are presented to validate the efficiency of the present methods. These results include the added mass and damping computations for a Wigley III hull and an S-175 hull with forward speed using both two-dimensional and three-dimensional approaches. Exciting forces acting on a Wigley III hull due to regular head seas are obtained and compared using both the fully three-dimensional method and the two-dimensional strip theory. All the computational results are compared with experiments or other numerical solutions.