圆弧型贯底式多孔介质防波堤防浪效果的解析研究

针对圆弧型贯底式多孔介质防波堤防浪效果研究,给出了防浪效果计算的解析方法.假定防波堤刚性垂直薄壁,空间固定,水深恒定.假想存在一个圆柱面,把流场划分为内外区域,在每个区域上将速度势用特征函数展开,然后在它们的公共边界上进行匹配.匹配的原则是公共边界上速度连续,压力连续,从而可得到关于未知系数的一组线性代数方程组,解出未知系数,即可求得流域中任意一点的速度势和波高.数值结果给出了不同入射波波长、不同波向入射及防波堤不同孔隙率、不同张角时防波堤周围波幅分布的等高线图.结果表明,圆弧型贯底式多孔介质防波堤的防浪效果与入射波特征和防波堤的孔隙率密切相关.

Wave-prevention efficiency of an arc-shaped bottom-mounted porous breakwater

An analytical method was developed to study the wave-prevention effects of arc-shaped bottom-mounted porous breakwaters,which are assumed to be rigid,thin-walled,vertically-mounted,and in water of a constant depth.Assume an imaginary cylinder divides the flow domain into two regions.The velocity potential in each region is expanded with eigenfunctions.By satisfying continuity conditions of pressure and normal velocity across the imaginary fluid interface,a set of linear algebraic equations can be derived to determine the unknown coefficients for the eigenfunctions.Numerical results,in the form of contour maps of the dimensionless wave amplitude around the breakwater,are presented for various wave and breakwater parameters.Results show the effects of wave reduction by the arc-shaped bottom-mounted porous breakwater are closely related to the incident wavelength and the porosity of the breakwater.