复式断面明渠湍流的统计特征和拟序结构  

Turbulence statistics and coherent structures of compound open channel flows

作　　者：胡德芳 俞华锋 陈勇[3] 刘宇 及春宁[3] HU De-fang;YU Hua-feng;CHEN Yong;LIU Yu;JI Chun-ning(Jiangsu Company,China Three Gorges Renewables (Group) Co. Ltd.,Nanjing 210000,China;Power China Huadong Engineering Corporation Limited,Hangzhou 311122,China;State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China)

机构地区：[1]中国三峡新能源(集团)股份有限公司江苏分公司,南京210000 [2]中国电建集团华东勘测设计研究院有限公司,杭州311122 [3]天津大学水利工程仿真与安全国家重点实验室,天津300072

出　　处：《水道港口》2022年第1期43-49,共7页Journal of Waterway and Harbor

基　　金：国家自然科学基金项目(51779172);中国长江三峡集团有限公司科研项目资助(201903066)。

摘　　要：应用直接数值模拟(DNS)方法,研究了复式断面明渠湍流的一阶和二阶统计特征,分析了湍流拟序结构在复式断面明渠内的分布规律。首先,针对平板边界层湍流问题对数值模拟方法的精度进行了验证;随后,分析了复式断面明渠的主流流速分布、二次环流强度和分布,以及二次环流对主流流速分布的影响,讨论了紊动强度和雷诺剪切应力极值大小和分布特征;最后,再现了复式断面明渠湍流的三维拟序结构,阐述了滩槽结合处典型“发卡”涡结构的特征及其诱发二次环流的机制。This paper numerically investigated the first-order and second-order turbulence statistics and the coherent structures of compound open channel flows by using the direct numerical simulations. First, the accuracy of the adopted numerical methodology was validated against the available results of turbulent flow over a flat plate. After that, the strength and distribution of the primary and secondary flows, together with the effect of the secondary flow on the distribution of the primary flow, were discussed. The extremum and distribution of the turbulence intensities and the Reynolds shear stresses were investigated. Finally, the three-dimensional coherent structures in compound open channel flows were visualized and the mechanisms of typical ′hairpin′ vortices near the corner connecting the floodplain and the channel on inducing the secondary flow were elaborated.

关 键 词：复式断面明渠 直接数值模拟 二次环流 “发卡”涡 

分 类 号：TV142.1[水利工程—水力学及河流动力学] U65[交通运输工程—港口、海岸及近海工程]