Numerical simulation of wave overtopping over seawalls using the RANS equations

Based on the Reynolds-Averaged Navier-Stokes(RANS) equation,the finite volume method and standard turbulence k-epsilon model,a numerical wave tank was presented in the frame of FLUENT through modifying the source terms of momentum equations by distributed sources associated with the incoming waves.The volume of fluid method(VOF) is used to trace the free surface.Regular wave overtopping over the crest of an impermeable coastal structure located on a sloping beach is predicted numerically by using the numerical model developed previously for predicting wave run-up on such a structure located on the horizontal seabed.The computed average overtopping rates are shown to be in good agreement with available small-scale test data and the results calculated by the non-linear shallow water(Hu et al.(2000)) model.The model is valid.Compared to the AMAZONE(Hu et al.(2000)) model based on NLSW equation,it can effectually solve the problems,which include the violent deformation,jet and breaking of the free surface.