波浪与带窄缝多箱体作用共振现象的模拟研究

Numerical study of fluid resonance induced by wave action on multi-boxes with narrow gaps

针对波浪与带有窄缝多箱体结构作用产生的流体共振问题,建立了基于域内源造波技术的二维非线性时域数值波浪水槽模型,其中自由水面满足完全非线性运动学和动力学边界条件,窄缝内流体引入人工阻尼来等效由于涡旋运动和流动分离引起的黏性耗散,计算域边界采用高阶边界元进行离散。通过模拟三箱体间两窄缝内相对波高变化,并与已发表的数值与实验结果对比,验证了本模型的准确性。同时通过大量的数值计算,分析了箱体数量对窄缝内水体共振频率、共振波高以及对结构反射波高和透射波高的影响。

Based on wave generation technique by a inner-domain source,a two-dimensional nonlinear numerical wave flume over time is developed to investigate the fluid resonance induced by the interaction between wave and multi-objects with narrow gaps.In the numerical model,the fully nonlinear kinematic and dynamic boundary conditions are set for the instantaneous free surface;the artificial damping is introduced into the gap to simulate the viscous dissipation due to vortex motion and flow separation;the computational domain is discretized using higher-order boundary elements.The proposed model is validated by the published experimental and numerical data of the relative wave height at two narrow gaps of three boxes.Numerical experiments are performed to study the following：the effects of the number of the boxes on the resonant frequency,wave height at various gaps and the reflected and transmitted wave heights of the objects.