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

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 sepa...

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Published in:China ocean engineering 2018-10, Vol.32 (5), p.514-523
Main Authors: Jiang, Xue-lian, Yang, Tian, Zou, Qing-ping, Gu, Han-bin
Format: Article
Language:English
Subjects:
Boundary layer
Boundary layers
Breakwaters
Cnoidal waves
Coastal Sciences
Computational fluid dynamics
Dynamics
Empirical analysis
Engineering
Entrainment
Fields
Flow separation
Fluid flow
Fluid- and Aerodynamics
Hydrodynamics
Interactions
Marine & Freshwater Sciences
Numerical and Computational Physics
Oceanography
Offshore Engineering
Parametric analysis
Reynolds averaged Navier-Stokes method
Separation
Simulation
Velocity
Vortices
Vorticity
Wave propagation
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cited_by cdi_FETCH-LOGICAL-c393t-d42c9e36bc2c3d3875bfbf49a525f66aefd222036922ef91839debea716c3b513
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description 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.
doi_str_mv 10.1007/s13344-018-0054-5
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source Springer Nature
subjects Boundary layer
Boundary layers
Breakwaters
Cnoidal waves
Coastal Sciences
Computational fluid dynamics
Dynamics
Empirical analysis
Engineering
Entrainment
Fields
Flow separation
Fluid flow
Fluid- and Aerodynamics
Hydrodynamics
Interactions
Marine & Freshwater Sciences
Numerical and Computational Physics
Oceanography
Offshore Engineering
Parametric analysis
Reynolds averaged Navier-Stokes method
Separation
Simulation
Velocity
Vortices
Vorticity
Wave propagation
title Flow Separation and Vortex Dynamics in Waves Propagating over A Submerged Quartercircular Breakwater
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