Flow Separation and Vortex Dynamics in Waves Propagating over A Submerged Quartercircular Breakwater

作     者：JIANG Xue-lian YANG Tian ZOU Qing-ping GU Han-bin 

作者机构：Tianjin Key Laboratory of Soft Soil Characteristics & Engineering EnvironmentTianjin Chengjian University State Key Laboratory of Hydraulic Engineering Simulation and SafetyTianjin University The Lyell Centre for Earth and Marine Science and TechnologyInstitute for Infrastructure and EnvironmentHeriot-Watt University School of Naval Architecture &Mechanical-Electrical EngineeringZhejiang Ocean University 

出 版 物：《China Ocean Engineering》 (中国海洋工程（英文版）)

年 卷 期：2018年第32卷第5期

页      面：514-523页

核心收录：

学科分类：0710[理学-生物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 0908[农学-水产] 07[理学] 0707[理学-海洋科学] 0807[工学-动力工程及工程热物理] 0815[工学-水利工程] 0824[工学-船舶与海洋工程] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：financially supported by the National Natural Science Foundation of China(Grant Nos.51509178 and 51509177) the Natural Science Foundation of Tianjin City(Grant No.14JCYBJC22100) the Natural Science Foundation of Tianjin Education Commission(Grant No.2017KJ046) 

主　　题：submerged quartercircular breakwater cnoidal wave flow separation vortex dynamics scour 

摘      要：The interactions of cnoidal waves with a submerged quartercircular breakwater are investigated by a ReynoldsAveraged Navier–Stokes(RANS) flow solver with a Volume of Fluid(VOF) surface capturing scheme(RANSVOF) model. The vertical variation of the instantaneous velocity indicates that flow separation occurs at the boundary layer near the breakwater. The temporal evolution of the velocity and vorticity fields demonstrates vortex generation and shedding around the submerged quartercircular breakwater due to the flow separation. An empirical relationship between the vortex intensity and a few hydrodynamic parameters is proposed based on parametric analysis. In addition, the instantaneous and time-averaged vorticity fields reveal a pair of vortices of opposite signs at the breakwater which are expected to have significant effect on sediment entrainment, suspension, and transportation,therefore, scour on the leeside of the breakwater.