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采用VOF(Volume of Fluid)方法追踪自由液面,辅以Realizable(可实现化)κ-ε湍流模型封闭两相流时均方程,对有限尾水深波浪底板壁面射流水力特性进行了数值模拟。微分方程的离散采用有限体积法,速度与压力耦合求解使用了压力隐式算子分裂PISO(Pressure-Implicit with Splitting of Operators)算法。分析了入射速度和底板粗糙度对流场流线分布、横断面最大流速沿程衰减规律、底板压强分布规律等水力特性的影响。研究发现:流场内存在两个大的漩涡,而且波浪底板凹面附近存在有小的漩涡;入射流速越大,横断面最大流速沿程衰减梯度越大;波浪底板上的压强也呈波状分布,且压强大小主要受入射流速和底板粗糙度两个因素的影响。
The VOF (Volume of Fluid) method was used to track the free surface, and the Realizable (κ) ε turbulence model was used to simulate the jet flow in the deep wavy bottom plate floor. The differential equation is discretized by the finite volume method, and the pressure-implicit with Splitting of Operators (PISO) algorithm is used to solve the coupling of velocity and pressure. The effects of incident velocity and floor roughness on flow field distribution, cross-sectional maximum flow velocity attenuation and floor pressure distribution are analyzed. It is found that there are two large vortices in the flow field and there is a small vortex near the concave surface of the wave floor. The larger the incident flow velocity is, the greater the attenuation gradient along the maximum flow velocity of the cross section is. And the size of the pressure is mainly affected by the incident flow rate and roughness of the floor two factors.