波浪与水囊潜堤相互作用的数值模拟

Numerical simulation of wave interaction with submerged fluid-filled membrane breakwater

基于黏性流体力学理论构建波浪与水囊潜堤相互作用的计算流体力学数值模型。利用高阶差分方法求解纳维斯托克斯方程,采用有限元方法求解结构动力学方程,采用虚拟单元浸入边界法实现流体和固体求解器的高精度耦合求解。通过流体体积方法实现界面重构,与试验结果比较验证模型的有效性。对规则波与不同充盈水囊潜堤相互作用进行数值模拟,寻找合适的充盈度、探求其消波机制。结果表明:1)开发的数值模型可有效模拟波浪与水囊潜堤相互作用过程中的波浪变形和结构响应;2)非充盈柔性水囊潜堤的大幅度振动更易促使结构附近涡旋的演化与脱落,并伴随着能量的耗散。

A viscous flow-based computational fluids dynamics model is proposed for the treatment of the water wave and a submerged membrane breakwater interaction.The Navier-Stokes equation is solved using the high-order difference method,and the finite element method is used for the structural dynamics equations.A modified ghost-cell immersion boundary method is used to achieve high-precision coupled solution of fluid and solid solvers.The interface reconstruction is realized by the fluid volume method,and the validity of the model is verified by comparison with the experimental results.Numerical simulation of the interaction between regular wave and a submerged fluid-filled membrane breakwater with different filling degree is carried out to find the appropriate filling degree and explore the wave elimination mechanism.The results show that:1)The numerical model developed can effectively simulate the wave deformation and structural response during the wave passing by the submerged fluid-filled membrane breakwater.2)The large vibration of the inadequate submerged fluid-filled membrane breakwater is more likely to promote the evolution and shedding of vortices near the structure,and is accompanied by the dissipation of energy.