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 

机构地区：[1]Tianjin Key Laboratory of Soft Soil Characteristics & Engineering Environment,Tianjin Chengjian University [2]State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University [3]The Lyell Centre for Earth and Marine Science and Technology,Institute for Infrastructure and Environment,Heriot-Watt University [4]School of Naval Architecture &Mechanical-Electrical Engineering,Zhejiang Ocean University

出　　处：《China Ocean Engineering》2018年第5期514-523,共10页中国海洋工程（英文版）

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)

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.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.

关 键 词：submerged quartercircular breakwater cnoidal wave flow separation vortex dynamics SCOUR 

分 类 号：P7[天文地球—海洋科学]