Breakwater is a common structure in the coastal area, which can prevent wave attack in the extreme weather. Many previous researches are based on two-dimensional models, but in real sea conditions, the wave-breakwater interaction is a three-dimensional process involving wave diffraction and wave oblique propagation, so it is also necessary to use three-dimensional models to study this problem. In this paper, a CIP (constrained interpolation profile)-based numerical model with adaptive mesh has been presented to study the interaction between the regular wave and the breakwater. In this CIP-based model, a constrained interpolation profile (CIP) method is employed as the base flow solver based on the incompressible Navier-Stokes equations and THINC/SW (Tangent of Hyperbola for Interface Capturing with Slope Weighting) method is applied to track the flow interface movement. Immersed boundary method is used to treat the wave-breakwater interaction. Meanwhile, the model adds momentum source wave-maker for wave generation and wave damping layer for wave absorption. The adaptive mesh uses the Afivo (Adaptive Finite Volume quadtree/Octree mesh) framework. Two-dimensional model was used to simulate the regular wave transmission over a submerged breakwater and threedimensional model was used to simulate the directional regular wave transmission across a vertical breakwater. The numerical results were compared with the previous studies and good agreements were obtained. It shows that our numerical model is suitable to describe the regular wave-breakwater interaction.
Breakwater is a common coastal protection structure, which are used to maintain water calm condition for ships and constructions in harbor basin and coastal areas. Caisson breakwater and rubble mound breakwater are two typical structures in practical application(Sadeghi et al., 2017). Caisson breakwater can be seen as a vertical wall breakwater and have advantages in deep water for low cost in construction. Rubble mound breakwater are usually of trapezoidal cross section and can be seen as submerged trapezoidal breakwater(Gedda and Rao, 2019). When we design and build a breakwater, our main concerns are focused on the performance of the breakwater against the water wave.
