源造波法在三维完全非线性数值波浪水槽中的应用

Application of source generation of waves in 3D fully nonlinear numerical wave tank

为消除波浪在水槽出流边界的反射及波浪遇到结构物后在入射边界形成的二次反射,基于时域高阶边界元方法建立三维完全非线性数值波浪水槽模型:利用源造波法产生入射波浪,采用人工阻尼层技术消除波浪反射及二次反射;建立水槽的格林函数并应用于整个计算域,消除水槽两侧壁和底面的积分,减少了计算量.利用所建模型分别对规则波和不规则波的数值实验表明,数值结果与理论解吻合良好,且在出流边界和入射边界均无反射现象.

A three-dimensional fully nonlinear numerical wave tank （NWT） model was founded based on a time-domain higher-order boundary element method （HOBEM） to eliminate wave reflection at outflow boundary and secondary reflection at the incident boundary from a structure. The source generation of waves was used to generate input waves and the artificial damping layers were adopted to eliminate wave reflection and secondary reflection. A channel Green function was founded and applied in entire computational domain, and thus the integral on the two lateral sides and bottom were excluded, and the calculation complexity was reduced. Numerical experiments on regular and irregular waves using the model in a wave tank show that the numerical results match well with analytical solutions, and it has no reflection on both outflow boundary and incident boundary.