Simulation of Floating Body in Nonlinear Wave by Vortex Methods

为了在恶劣的海洋环境条件下安全地使用浮式结构物，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，人们提出了附加鳍结构的方法。本研究采用两种涡方法，随机行走方法和核心扩散方法，对自由面下圆柱和垂荡鳍板的均匀绕流进行了数值模拟。在均匀流的模拟中，我们进行了参数研究，这有助于我们确定在随后的模拟中使用的数值参数。将计算结果与实验结果进行了比较，验证了计算结果的准确性.在垂荡平板的模拟中，对平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.