Simulation of Floating Body in Nonlinear Wave by Vortex Methods

为了在海上恶劣环境条件下安全地使用浮体结构物，必须减小浮体的运动和作用在浮体上的系泊力。为了减小这些运动和系泊力，提出了附鳍结构。在这项研究中，两种涡旋方法，即随机游动方法和核心扩散方法，被应用于圆柱体的均匀绕流和自由表面下的垂荡鳍板。在均匀流模拟中，我们进行了参数研究，帮助我们确定了后续模拟中要使用的数值参数。然后，将模拟的尾流速度与实验结果进行了比较，验证了计算的准确性。在浮板的模拟中，对浮板上的水动力进行了模拟，并与实验结果进行了比较。

To utilize floating structure under heavy environmental condition in sea safely, motions of the floating body and the mooring forces acting on the body have to be reduced. To decrease these motions and mooring forces, fins attached structure has been proposed.In this study, two vortex methods, the Random-Walk method and the Core-Spreading method, are applied to uniform flow past a circular cylinder and heaving fin plate under free surface. In the simulation of uniform flow, we conduct parametric study which helped us determine the numerical parameters to be used in subsequent simulations. Then, the simulated wake velocities are compared with experimental results to verify the calculation accuracy. In the simulation of heaving plate, hydrodynamic forces on the plate are simulated and compared with experimental results.