| Wave motion is one of the important problems which must be considered carefully while the structures such as breakwaters are designed or built. This matter may threaten the safety of coastal area. In this paper, numerical model of the wave motions in front of seawall is constructed. Base on it, related visual software is made in order to be used as a convenient tool for engineers.⑴A numerical wave flume is built. The wave field in front of breakwater is modeled by solving Reynolds Averaged Navier-Stokes (RANS) equation and continuity equation. The source generation of waves is adopted to simulate successive long-time wave generation of waves and absorb the reflected waves from a structure. Combined with the Sommerfeld condition, sponge layer for wave damping absorber is used to the open boundary. To track free surfaces, the Volume of Fluid (VOF) method is applied. Agreement between the analytical data and the numerical results is good.⑵Based on the numerical wave flume built above, wave motions in front of vertical breakwaters and wave pressure in front of composite breakwaters have been studied. By compared the velocity fields under different wave condition, the distribution rules of bottom velocity has been revealed and the mechanism of scouring and depositing in front of breakwater under the action of regular broken waves is analyzed further. On the other hand, Wave pressures acted on some kinds of composite breakwaters have been calculated. The distribution rules of these pressures have been concluded for choosing reasonable shape.⑶In order to increase practicability of the model and visualization of the results, visual software of simulating wave motions has been compiled.
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