Detached-eddy simulation of turbulent coherent structures around groynes in a trapezoidal open channel

作     者：Jing-xin Zhang Jian Wang Xiang Fan Dongfang Liang Jing-xin Zhang;Jian Wang;Xiang Fan;Dongfang Liang

作者机构：Key Laboratory of Hydrodynamics(Ministry of Education)shanghai Jiao Tong UniversityShanghai200240China School of Naval ArchitectureOcean and Civil EngineeringShanghai Jiao Tong UniversityShanghai200240China 

出 版 物：《Journal of Hydrodynamics》 (水动力学研究与进展B辑（英文版）)

年 卷 期：2020年第32卷第2期

页      面：326-336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：Project supported by the National Natural Science Foundation of China(Grant No.11572196) the Shanghai Science and Technology Committee(Grant No.17230741200) 

主　　题：Open channel flow groyne free surface detached eddy simulation turbulent coherent structure 

摘      要：The hydrodynamics in a straight open channel with a multiple-embayment groyne field was investigated using the detached-eddy simulation(DES).A series of short groynes were included on a 1:3 side slope of the *** work focuses on the turbulent coherent structures around groynes on an uneven *** around groyne fields are characterized by massive separation and highly unsteady *** can capture a wide spectrum of eddies at a lower computational cost than the large eddy simulation(LES)or direct numerical simulation(DNS).In the present work,a zonal DES model(ZDES)was used to simulate the flow around *** ZDES model is a modified version of the DES designed to overcome the model-stress depletion(MSD)of the RANS/LES hybrid *** vortex system consists of the horseshoe vortex(HV)formed at the base of the obstructions,the necklace vortex(NV)that wrapped the groyne tips near the free surface,and the shedding vortex(SV)underneath the free *** effects of the incident flow and local topography on the vortex evolution were investigated by analyzing the mean flow structures and the instantaneous turbulent flow *** important vortices cannot be captured because of the averaging process,while some flow structures cannot be observed in the instantaneous *** mean flow is only a reflection of the averaging process when complex vortices are present.