规则波作用下带栅栏板海堤越浪的数值模拟

Numerical Simulation of Overtopping Against Sea Dikes with Fence Panels in Regular Waves

基于RANS方程和VOF方法,采用RNG k-ε湍流模型,建立了可进行海堤断面越浪数值模拟的数值波浪水槽,首次给出了规则波作用下精确刻画栅栏板形状的海堤越浪过程数值模拟。采用现有的简单断面的斜坡堤越浪实验结果,对数值模型进行了验证,结果表明越浪量计算结果与实验数据基本一致。通过数值实验,给出了规则波作用下无栅栏板和带栅栏板情况下海堤越浪堤顶流垂线平均流速的时间过程线,计算结果得到实验验证。初步讨论了栅栏板作用下波浪爬高和越浪流的流场特征和栅栏板的消能机理。

Based on the Reynolds-averaged Navier-Stokes equation, the Volume of Fluid method and the RNG k-e turbulence model, a numerical wave tank was established. The numerical model can simulate the overtopping process in regular waves with accurate describing fence panels. Regular wave overtopping against a sea dike of simple profile was simulated. Comparing the numerical results with physical model data and other numerical results for the case without fence panels, it proved that the numerical model can predict overtopping discharge reasonably. For the case of a sea dike with fence panels, the computed overtopping discharge and the depth averaged velocity of overtopping flows on the dike crest were obtained and compared with the physical model result. The velocity fields and the turbulent dissipation fields near the wall of sea dike with fence panels were discussed to look insight the effects of fence panels on the energy dissipation and reduce the overtopping discharge.