多向不规则波群传播的数值模拟

Numerical simulation of multidirectional irregular wave group propagation

波群的模拟是与波群有关的数值和物理模型试验的前提。实际的波浪是多向的不规则波,为了在实验水池中模拟多向不规则波群,该文首先根据给定的波要素、群性参数和方向分布参数,给出了多向不规则波群的数值模拟方法,在此基础上利用有限元法求解改进的Boussinesq方程的数值计算模型,建立了数值水池在指定位置模拟所要求群性的多向不规则波的入射波浪边界条件的计算方法。典型算例表明:按照该文建议的方法确定入射波浪边界条件而建立的数值模型,可以在水池指定位置处产生满足给定群性要求的多向不规则波浪。此外,对多向不规则波群的传播进行了数值研究。

Irregular wave group motion was simulated for comparison with physical model tests.Real waves are multidirectional waves.A numerical method was developed to simulate multidirectional irregular wave groups for various wave parameters,grouping factors and directional spreading parameters for use in designing an experimental wave basin for multidirectional irregular wave groups.The simulations of the wave time series of the incident waves was based on the numerical model of modified Boussinesq equations solved by finite element.Examples show that multidirectional waves containing the desired wave groupiness can be generated at a specified position in the numerical wave basin.Transformations of the wave groupings in the basin are also numerically analyzed.