均匀流中双色波传播特性的模拟研究

Numerical study on propagation characteristics of bichromatic waves in uniform current

针对双色波浪与均匀流相互作用问题,采用时域高阶边界元方法建立自由水面满足完全非线性边界条件的数学模型。求解中采用混合欧拉-拉格朗日方法追踪流体瞬时水面,运用四阶龙格库塔方法更新下一时间步的波面和速度势。通过与已发表试验结果对比,验证了本模型的准确性。通过数值计算研究了水流参数对各组成波及衍生的高阶波幅值、波浪和水流间能量交换的影响规律。

As for the problem of bichromatic waves interaction with uniform current,the time-domain higher-order boundary element method is used to found a numerical model satisfied the fully nonlinear free surface boundary conditions.In the solving process,the mixed Eulerian-Lagrangian method is adopted to track the transient water surface and the 4th Runga-Kutta technique is used to refresh the velocity potential and free surface at the next time step.By comparison with the published experimental results,the proposed model is validated.Numerical experiments are performed to study the rules for the effects of current velocity on various composition wave amplitudes and power exchange between bichromatic waves and current.