Numerical analysis of wave transformation over low-crested impermeable breakwater

摘要

In this paper, a VOF-type model based on 2D Reynolds-Average-Navier-Stokes equations was applied to investigate irregular waves transformation over low-crested impermeable breakwater. The model considers wave reflection, transmission, breaking, and turbulence generation. Three different water depths were tested in order to examine the influence of the breakwater freeboard. The predicted surface elevations are compared with laboratory data set collected during DELOS project. Generated waves through an internal wavemaker are in a good agreement with measurements at the incident side. The measured surface elevation at the transmission side is reproduced well for submerged breakwater, but underestimated slightly by the numerical model for both zero freeboard case and emerged case. This numerical model reproduces the transformation of wave spectrum over the breakwater well. The predicted wave skewness and asymmetry at the transmission side are in a good agreement with measurements and empirical equations. The transformations of wave skewness and asymmetry over low-crested impermeable breakwater are also investigated.