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基于三维非稳态的Navier-Stokes方程,采用有限体积法进行数值离散,在构造高分辨率STACS格式的VOF方法的基础上,建立基于气液两相流的三维自由面流动模型,并基于该模型对三维剪切流场和圆柱水体坍塌进行了三维模拟,检验其数值精度.应用该模型数值研究冲泻区内涌波(bore)在均匀斜坡上的动态传播过程.对上爬水流自由面水位高度与实验数值进行对比,结果显示数值解与实验解吻合较好,模型能很好描述水流的掺气运动.数值分析了涌波崩塌(Bore Collapse)、上冲流(Uprush)和回落流(Backwash)等过程中的自由水面、瞬时流速及床面最大剪切应力的时空分布.结果表明,冲泻区水动力结构时空变化非常复杂,模型能捕捉到高速薄层水流结构,优于前人的数值结果,研究有利于进一步了解冲泻区内的泥沙输运规律及岸滩演变机制.
Based on the three-dimensional unsteady Navier-Stokes equation, the finite volume method is used to carry out numerical discretization. Based on the high resolution STACS format VOF method, a three-dimensional free-surface flow model based on gas-liquid two-phase flow is established. The three-dimensional simulation of three-dimensional shear flow field and the collapse of a cylindrical water body is carried out to verify the numerical accuracy of the model. The model is used to study the dynamic propagation of the borehole over a uniform slope in the water area. The results show that the numerical solution is in good agreement with the experimental one, and the model can well describe the aeration movement of the water flow.The numerical analysis of the Bore Collapse, Uprush and Backwash ) And so on.The results show that the spatio-temporal variation of hydrodynamic structure in the diarrhea area is very complicated, the model can capture the high-speed laminar flow structure and is superior to the predecessor’s Numerical results, the study is conducive to further understanding of the sediment transport law and the shore beach evolution mechanism.