泥沙研究2017，Vol.42Issue(3)：42-47,6.DOI:10.16239/j.cnki.0468-155x.2017.03.008
泄水建筑物下游冲刷坑二维数值模拟
Two-dimensional numerical modelling on local scour pit downstream of flow release structure
摘要
Abstract
A two-dimensional numerical model is established to simulate flow field and longitudinal profile of the scour pit downstream of Juting Hydropower Station,with RNG k-e turbulence model to close N-S equations.Finite volume method is used to discrete grid.VOF is used to track location of water surface.The wall shear stress was taken as the start criterion obtained using Ansys Fluent UDF program wrote with C program language to control the movement of the grid of the bottom boundary.Dynamic mesh model is used to achieve the reconstruction of the inter grid at erosion area.Simulation results show that the maximum scour depth and geometry of the river bed downstream of Juting Hydropower Station coincided well with those of physical model.The wall shear stress appears decreasing sharply in souring process,so it appears increasing at the front part and decreasing at the rear part along the way in the scour pit.The scope that the wall shear stress appears increasing along the way is expanded along with development of the scour pit,until the wall shear stress appears increasing along the way in the whole equilibrium scour pit.Turbulence kinetic energy appears gradually decreasing in souring process and it appears decreasing along the way in the scour pit.The equilibrium hydraulic geometry of scour pit or sediment incipient motion on the pit bed is mainly depended on flow shear stress,and turbulent kinetic energy on the pit bed has an important effect on sediment incipient motion.关键词
二维数学模型/局部冲刷坑/最大冲刷深度及纵向形态/床面剪切应力/湍动能Key words
two-dimensional numerical model/local scour pit/maximum depth and longitudinal hydraulic geometry/wall shear stress/turbulent kinetic energy分类
建筑与水利引用本文复制引用
张根广,王新雷,吴彰松,李林林..泄水建筑物下游冲刷坑二维数值模拟[J].泥沙研究,2017,42(3):42-47,6.基金项目
国家自然科学基金项目(51279170) （51279170）
