基于谐波理论的数值波浪水池研究

Research on Numerical Wave Tank Based on Harmonic Theory

采用CFD黏流方法建立基于谐波理论的谐波数值水池。将谐波时历曲线及其各子成分波的频率、波高与理论解比较,验证了该数值波浪水池的可靠性。以谐波为激励开展KVLCC2标模迎浪航行运动响应特性研究,通过运动时历的傅里叶变换得到在各子成分波频激励下的运动响应幅值,并将其与试验数据对比,验证了该方法的可靠性,实现了通过单次波浪激励得到完整运动响应曲线的高效计算。

A harmonic wave theory-based numerical wave tank is established using the CFD viscous flow method.By carrying out numerical simulations of a single harmonic wave propagating in the numerical wave tank,the time history of wave elevation is obtained,and the wave frequencies and wave amplitudes for sub-component waves are analyzed based on the Fourier transform.By comparing the numerical results with the theoretical values,the reliability of the numerical wave tank based on the harmonic wave theory is verified.By carrying out numerical simulations of the motion of a KVLCC2 ship model advancing in head waves in the numerical wave tank,the linear response amplitude operator(RAO)at each sub-component wave frequency is obtained with Fourier transform.By comparing the numerical results with the available experimental data,applicability of this numerical method to the calculation of ship motion in head waves is verified in terms of calculation accuracy and efficiency.