Flow Separation and Vortex Dynamics in Waves Propagating over A Submerged Quartercircular Breakwater |
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| Authors: | Xue-lian Jiang Tian Yang Qing-ping Zou Han-bin Gu |
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| Institution: | 1.Tianjin Key Laboratory of Soft Soil Characteristics & Engineering Environment,Tianjin Chengjian University,Tianjin,China;2.State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin,China;3.The Lyell Centre for Earth and Marine Science and Technology, Institute for Infrastructure and Environment,Heriot-Watt University,Edinburgh,UK;4.School of Naval Architecture &Mechanical-Electrical Engineering,Zhejiang Ocean University,Zhoushan,China |
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| Abstract: | The interactions of cnoidal waves with a submerged quartercircular breakwater are investigated by a Reynolds-Averaged Navier–Stokes (RANS) flow solver with a Volume of Fluid (VOF) surface capturing scheme (RANS-VOF) 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. |
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