Based on the filtered Navier-Stokes equations and Smagorinsky turbulence model, a numerical wave flume is developed to investigate regular wave overtopping flow over trapezoidal smooth impermeable sea dike. Simulation of wave breaking is carried out to validate the numerical wave flume with wave generation and absorbing modules. With the in-house developed code, a series of test cases combined different crest heights and wave parameters are carried out. These results are compared with experimental results and numerical results available. The varying tendency of layer thickness and maximum velocity along dike crest is analyzed for both non-breaking and breaking regular waves. Then, the relationship between the magnitude of overtopping flow velocity and overtopping discharge is investigated
