The Study of the Wave Attenuation Performance of Triple Plates Interacting With a Solitary Wave

Abstract

Abstract In order to explore measures to reduce tsunami wave height, this paper uses solitary waves instead of tsunamis, numerically simulates the interaction between triple rigid flat plate model and solitary waves, and analyzes the effects of the dipped depth, plate spacing and tilt angle on the transmission coefficient. The triple rigid plates are the same scale and remain unchanged. The relationship between plate length L and water depth h is L/h = 0.4; the vertical distance d from the lower end to the water surface is used to change the position of the plate in the water. Triple plates is in the equal space S arrangement. Based on the Fluent software platform, a two-dimensional numerical wave flume is constructed, and the piston-type solitary wave generation method based on Goring is used to simulate the physical solitary wave. Firstly, a solitary wave is numerically constructed at different truncation velocities R, and compared with the solitary wave height of the analytical solution and the experimental results, the numerical simulation parameters such as the truncation velocity R with sufficient accuracy are determined. Then, under the same water depth h and solitary wave height H, the propagation of solitary waves in triple plates under 9 kinds of relative dipped depth d/h, 16 kinds of relative spacings S/λ and 15 kinds of tilt angles is numerically simulated, the transmission coefficient Ct of the model is calculated, and the effects of the relative dipped depth, relative spacings and tilt angles of the plates on the transmission coefficient Ct are analyzed. The results show that the transmission coefficient decreases first and then increases with the increase of the relative dipped depth d/h, and there is an optimal relative dipped depth d/h. The transmission coefficient decreases monotonically with the increase of the relative spacings S/λ, and tends to be flat. When relative dipped depth d/h = 0.13 and the relative spacings S/λ = 6.69%, the transmission coefficient is the smallest at the tilt angle of 75°.