Analysis on the Reflection Coefficient of Irregular Wave by Perforated Breakwaters with Superstructure

摘要

Irregular wave acting on the superstructure of the perforatedrnbreakwaters is simulated through numerical wave flume. And thernreflection coefficient in front of perforated structure is analysed. VOFrnmethod is utilized to solve the Reynolds-averaged Navier-Stokesrnequation (RANS) and the k–e model. In order to simulate successivernlong-time making wave of irregular waves and absorb the reflectedrnwaves from the perforated breakwaters, the internal source generationrnof wave is applied. An air state equation under the constant temperaturerncondition is used to simulate the air pressure in the chamber when thernhole of perforated plate is full of the water. According to therncomparison between the numerical result and test data, it is seen thatrnthe numerical model is well verified by the experimental data. Then anrnempirical expression for computing the reflection coefficient isrnobtained from the linear regression with the main related parameters.rnThe expressions of these empirical relations are simple and useful forrnactual engineering design.