Numerical simulation of long-wave wave dissipation in near-water flat-plate array breakwaters

Abstract

A plate system, composed of flat array is proposed to be one type of breakwater. At present, little research has been done on the wave elimination of the plate under long-period waves. The Reynolds-averaged Navier-Stokes (RANS) equations are treated based on three-dimensional closed RNG k-ε turbulence model and the governing equations are solved by VOF method. A numerical model of the interaction between wave and flat array breakwater is established to study the wave elimination performance of different wave period ang steep. The flow and vortex fields are solved to research the wave dissipation mechanism of breakwaters. Results show the wave transmission coefficient tends to increase with the increase of wave period. Wave transmitted coefficient are all less than 0.4 in this test, indicating that the flat array plate breakwater maintains a certain wave dissipation capacity for long-period waves. At the same period, the wave steepness change mainly affects the amount of water passing through the upper part of the flat plate, which has some influence on the way the breakwater dissipates energy. The plate spacing is the main wave energy dissipation area, which provides space for water exchange and effectively eliminate waves while reducing the amount of board. The results preliminarily demonstrated the potential application of flat plate array as a wave energy breakwater, but the flat plate parameter design and the interaction of waves and flat plates needs further research.