基于能量分配的特定畸形波序列的数值模拟

文章对一个理论畸形波序列进行了数值模拟并且将数值结果与理论值做了对比.采用速度入口方法以实现波浪模拟.在造波边界处不考虑高阶波浪成分,只输入线性波浪速度.分别采用三种不同分辨率的网格进行数值模拟,以找到足够有效捕捉自由面的网格模型.考虑到快速傅里叶变换不能反映畸形波的时频特征,因而引入小波变换研究畸形波传播过程中的能量变化.最后比较了北海实测畸形波和文中理论畸形波小波变换的差异.

Numerical Simulation of Deterministic Freak Wave Based on Energy Distribution

In this study, a theoretical freak wave sequence is numerically simulated and compared with the theoretical results. To accomplish this objective, velocity inlet method is applied. At the wave-maker boundary, linear velocity components are input, which takes no consideration of high-er-order wave components. Numerical simulation in three different grid models is conducted to de-terminate which model is efficient as well as being capable to track the free surface. As Fast Fourier Transformation (FFT) can not reflect the temporal-frequency of the freak wave, thus wavelet analysis is introduced to investigate the energy of the wave package during the wave propagation. Comparison of wavelet transform of the freak wave recorded in North Sea and present freak wave is made.