斜坡上梯形潜堤附近流动结构的数值研究  

Numerical study on flow structure near trapezoid submerged breakwater on slop bottoms

作　　者：蒋昌波[1,2] 曹永港[1,2] 陈杰[1,2] 郭杰[1,2] 

机构地区：[1]长沙理工大学水利工程学院,长沙410114 [2]湖南省水沙科学与水灾害防治重点实验室,长沙410114

出　　处：《水动力学研究与进展（A辑）》2009年第3期286-295,共10页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金资助项目(No.50479015);教育部新世纪优秀人才支持计划(No.NCET-05-0710)

摘　　要：波浪通过斜坡上潜堤时的波形和非线性特性均有显著变化,同时潜堤附近会出现涡流的生成及消散现象,有必要对其深入研究。基于1:20的斜坡上的波浪水槽实验,分析规则波在斜坡上不可渗梯形潜堤附近的动力特性。本文垂向二维波浪数学模型以RANS方程为控制方程,采用非线性涡黏性(各向异性)k-ε紊流传输模型封闭雷诺应力项,利用VOF方法追踪自由表面以及采用源函数造波技术来模拟规则波对斜坡上潜堤的作用,数值计算结果与实验测量数据进行对比,吻合良好。利用数值计算进一步分析了流场、流线、紊动动能及紊动动能耗散率等特性,重点探讨了堤顶水深变化的影响,得到随堤顶水深增大,潜堤的消浪作用将明显减弱。There is an obvious variation for waveform and the nonlinear character of wave passing over the submerged breakwater on the slop. Meanwhile, vortex generation and dissipation phenomenon will occur near the submerged breakwater, which remains to further investigation.The kinematic characteristics near an impermeable trapezoid submerged breakwater under regular waves were analyzed in the wave flume with 1：20 smooth slope. In the paper, the governing equations of the vertical 2D model are the Reynolds-averaged Navier-Stokes equations. The Reynolds stress terms were closed by a nonlinear（anisotropic） k - e turbulence transportation model. It can simulate regular wave acting on Submerged Breakwater on Slop bottoms by using a VOF method for tracking the free surface and source function wave generating method. The calculated results agree well with the experimental data. Furthermore, based on the verified numerical model, velocity field ,streamline ,turbulent kinetic energy and turbulent dissipation were investigated. The results show that the wave dissipating effects of submerged breakwater are significantly weakened with increasing water depth of submergence.

关 键 词：VOF方法 潜堤 斜坡 传播变形 流动结构 数值模拟 

分 类 号：TV139.2[水利工程—水力学及河流动力学] U656.35[交通运输工程—港口、海岸及近海工程]