三峡工程导截流数值实验室的建立及数值模拟(Ⅱ)

Development of Hydraulics Numerical Laboratory and Its Application in River Closure and Diversion Engineering of Three Gorges Project and Numerical Simulation (II)

介绍了三峡工程导截流水流特性数值实验室的数值模拟技术及其应用情况。采用水深平均二维数学模型模拟坝址区大范围水域在导截流过程中水深平均的流场演变过程,利用二、三维耦合数学模型的概念,由二维数模成果给定三维模拟所需的初值条件及边界条件,使三维数值计算具有良好的精度和收敛速度。利用导截流数值实验室的实时数值试验,给出导截流过程关键部位的三维流速分布及水位分布,并与实测值吻合良好。这表明导截流水流特性数值实验室所采用的数值模拟技术合理可靠。

Application of the numerical laboratory in river closure and diversion engineering of Three Gorges Project is introduced. The variation of flow field in process of river closure and diversion at large water area of TGP dam site was simulated by depthaverage 2D mathematic model. Enploying the coupling concept of 2D and 3D models, the initial and boundary conditions for 3D simulation of local area were provided by 2D numerical results, So the calculated results possessed excellent accuracy and rate of convergence. The 3D numerical results for some key positions were compared with available measured data in terms of velocity profiles under different discharges of diverision channel and good agreement was achieved.