【作者】 方麟翔； 詹杰民； 李雨田； 范庆；

【Author】 FANG Lin-xiang;ZHAN Jie-min;LI Yu-tian;FAN Qing;Department of Applied Mechanics and Engineering,Sun Yat-sen University;

【机构】 中山大学应用力学与工程系；

【摘要】 丁坝作为一种重要的水工建筑物,在保护河岸、保证通航及引流方面具有很高的水利价值。与此同时,丁坝也存在着一些缺点,如造成对河床泥沙的冲刷,下游泥沙的淤积等等。研究丁坝绕流的相干结构为进一步研究丁坝对河床底部的冲刷奠定了基础,也对设计丁坝具有指导意义。本文基于流体体积法(VOF)采用Realizable k-ε湍流模型,通过OpenFOAM对单丁坝绕流问题进行了数值模拟,并采用Q准则得到流场中的涡结构。通过与Jeon等人的实验对比,验证了在非淹没式直线型单丁坝绕流中,中层平面存在着回流涡与角涡,同时近底面处还存在着马蹄涡结构,本文的工作,为设计丁坝结构提供了参考方法。更多还原

【Abstract】 As an important hydraulic structure,spur dike has high hydraulic engineering value in protecting river banks,ensuring navigation and drainage.At the same time,spur dike also has some shortcomings,such as causing erosion of riverbed sediments,siltation of downstream sediments,and so on.Studies the coherent structure around the spur dike not only lay the foundation for further studies about the scouring of the riverbed around spur dike,but also have guiding significance for the design of the spur dike.In this paper,based on OpenFOAM,the fluid volume method(VOF) and the Realizable k-epsilon turbulence model are used to simulate the flow around a single spur dike.And the vortex structure in the flow field is illustrated by the Q criterion.Compared with the experimental results of Jeon et al.,it is verified that in the flow around non-submerged straight single spur dike,there are recirculation vortices and angular eddies in the middle plane,and there are also horseshoe vortex structures near the bottom surface.The work in this paper provides a reference for the design of spur dike structures.更多还原