基于VOF模型的台阶式溢洪道数值模拟

Numerical Simulation of Stepped Spillway Based on VOF Model

为了深入研究台阶式溢洪道水流特性,通过利用FLUENT软件,采用标准k-ε紊流模型模拟湍流流场和VOF模型追踪自由水面的方法对某水库台阶式溢洪道流场进行数值模拟,得到了台阶式溢洪道的自由水面、水流流场、压强分布等水力特性,并与物理模型试验结果进行对比。结果表明:计算值与实测值吻合较好,数值模拟能够快捷获得更加全面的流场信息;同时发现,台阶内存在漩涡,紊动能和紊动耗散率较大,台阶水平面存在压强峰值,而垂直面出现负压区,可为台阶式溢洪道的优化设计提供可靠的参考依据。

In order to analyze the hydraulic characteristics of stepped spillway,the fluent software was applied to simulate the flow field on stepped spillway of a reservoir,in which the standard k- ε turbulence model was used to simulate the turbulent flow field,and VOF model was used to trace the free water surface.The free water surface,flow field and pressure distribution were obtained and compared with the physical model test results.The result shows that calculated results agree well with the measured values,the numerical simulation can get more detailed flow field information quickly.The study also found that the vortex occur insteps inside,and the turbulence kinetic energy and turbulence dissipation rate are bigger.The pressure peak value exist in horizontal plane of steps,and the negative pressure zone appear in vertical plane,which can provide reliable reference basis for the optimal design of stepped spillway.