长周期波作用下平板阵列防波堤消浪特性数值模拟研究

Numerical simulation of wave dissipation characteristic of flat plate array breakwater under long period waves

如何有效地抵御长周期波浪是目前海岸工程所需解决的难题。板式防波堤对长周期波浪具有一定的消浪效果,且施工方便、造价低廉、适用范围广,对其进一步的研究具有重要意义。本文基于数值模拟软件FLOW-3D,建立数值造波水槽,以防波堤相对板长L_(0)/L、相对板间距j/L、相对板厚d/H及板数N为研究参数,给出平板阵列防波堤最佳布置方案及尺寸。模拟结果表明:结构参数相对板厚d/H=0.1,板数N=4,相对板间距j_(1)/L=0.3,j_(2)/L=0.1,相对板长L_(0)/L=0.6,非均匀布置四板型式平板阵列防波堤的消浪效果最好,说明该布置形式对周期小于8 s(原型周期T=25.28 s)的长周期波有良好的消浪效果。

The elimination of long period waves has always been a difficult problem in coastal engineering that needs to be solved.Plate breakwater has a certain effect on long period waves,due to its convenience in construction,low cost and wide application range.Further research of which is of great significance.A numerical wave making flume is established based on Flow-3D in this paper,the optimal placement scheme and dimensions of the flat plate array breakwater are presented with the relative plate length L_(0)/L,relative plate spacing j/L,relative plate thickness d/H and number of plates N identified as research parameters.Simulation results show that,when the relative plate thickness d/H=0.1,plate number N=4,relative plate spacing j_(1)/L=0.3,j_(2)/L=0.1,relative plate length L_(0)/L=0.6,the wave suppression effect of non-uniform four-plate array breakwater is the best.It is shown that the arrangement form has good wave elimination for long period waves with period less than T=8 s(prototype period T=25.28 s).