Impact of depth ratio on flow structure and turbulence characteristics of compound open channel flows

作     者：Shao-wei Ding Cheng Zeng Jie Zhou Ling-ling Wang Chen Chen Shao-wei Ding;Cheng Zeng;Jie Zhou;Ling-ling Wang;Chen Chen

作者机构：College of Water Conservancy and Hydropower EngineeringHohai UniversityNanjing 210098China College of Mechanics and MaterialsHohai UniversityNanjing 211100China 

出 版 物：《Water Science and Engineering》 (水科学与水工程（英文版）)

年 卷 期：2022年第15卷第3期

页      面：265-272页

核心收录：

学科分类：080103[工学-流体力学] 08[工学] 080104[工学-工程力学] 081502[工学-水力学及河流动力学] 0815[工学-水利工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by the Fundamental Research Funds for the Central Universities(Grants No.B200202116 and B200204044) the National Natural Science Foundation of China(Grant No.51879086) the 111 Project from the Minstry of Education and State Administration of Foreign Expert Affairs of China(Grant No.B17015) 

主　　题：Large eddy simulation Compound open channel Depth ratio Flow structure Turbulence characteristics 

摘      要：Compound open channel flows appear in most natural rivers are of great importance in river management and flood *** this study,large eddy simulations were carried out to simulate the compound open channel flows with four different depth ratios(hr=0.10,0.25,0.50,and 0.75).The main flow velocity,secondary flow,Reynolds stress,and bed shear stress were obtained from numerical *** depth-averaged stream wise momentum equation was used to quantify the lateral momentum exchange between the main channel and *** instantaneous coherent structures were presented by the Q criterion *** impact of hr on flow structure and turbulence charac-teristics was *** results showed that with the increase of hr,the high velocity area in the main channel shifted to the floodplain,and the dip phenomenon became more obvious;the Reynolds stress largely contributed to the lateral momentum exchange within the flows near the side walls of floodplain;and the vortex structures were found to significantly increase in the floodplain region.