LAUSR

The purpose of the present study is to investigate the effect of device slopes and submergence depths on the wave reflection, transmission, and dissipation coefficients. The two-dimensional numerical simulations are performed by solving the unsteady Reynolds-averaged Navier–Stokes equations with the k−ω shear stress transport turbulence model using an open-source software OpenFOAM. The interface between water and air is captured by the volume-of-fluid method. The validation study is carried out by simulating a free-surface wave past a slope (1:35) installed at the bottom of the numerical tank. A good agreement between the numerical results and the published experimental data on the free surface elevations at different horizontal positions is observed. The present numerical results show that the wave reflection coefficient Kr decreases with increasing submergence depth of the device and increases with increasing device slope when the type of wave breaking on the slope is a plunging breaker (S1–S4). However, in the case of a surging breaker (S5), the Kr increases with increasing device submergence depth. Moreover, the wave dissipation coefficient Kd increases with the increasing device submergence depth under the slope S1–S4. However, a small value of Kd is obtained due to the limited dissipation of wave energy for slope S5. Finally, the transmission coefficient Kt decreases with increasing submergence depth and increases with increasing slope. When the device submergence depth exceeds a certain threshold (H4), the submergence depth has a limited effect on the wave characteristics coefficient Kr, Kt, and Kd.