Numerical study on flow structure near trapezoid submerged breakwater on slop bottoms

There is an obvious variation for waveform and the nonlinear character of wave passing over the submerged breakwater on the slop. Meanwhile, vortex generation and dissipation phenomenon will occur near the submerged breakwater, which remains to further investigation.The kinematic characteristics near an impermeable trapezoid submerged breakwater under regular waves were analyzed in the wave flume with 1:20 smooth slope. In the paper, the governing equations of the vertical 2D model are the Reynolds-averaged Navier-Stokes equations. The Reynolds stress terms were closed by a nonlinear(anisotropic) k-e turbulence transportation model. It can simulate regular wave acting on Submerged Breakwater on Slop bottoms by using a VOF method for tracking the free surface and source function wave generating method. The calculated results agree well with the experimental data. Furthermore, based on the verified numerical model, velocity field ,streamline ,turbulent kinetic energy and turbulent dissipation were investigated. The results show that the wave dissipating effects of submerged breakwater are significantly weakened with increasing water depth of submergence.