规则波作用下方形排柱附近水流特性数值模拟  

Numerical simulation of flow characteristics around square columns under regular waves

作　　者：王泽能 刘世建 吕文舒 陈瑞 WANG Ze-neng;LIU Shi-jian;LYU Wen-shu;CHEN Rui(Guangxi Beibu Gulf Investment Group Co.,Ltd.,Nanning 530022,China;Guangxi Transportation Science and Technology Group Co.,Ltd.,Nanning 530022,China;Beijing University of Technology,Beijing 100124,China;School of Civil Engineering,Changsha University of Science and Technology,Changsha 410015,China)

机构地区：[1]广西北部湾投资集团有限公司,广西南宁530022 [2]广西交科集团有限公司,广西南宁530022 [3]北京工业大学,北京100124 [4]长沙理工大学土木工程学院,湖南长沙410015

出　　处：《水运工程》2022年第2期16-22,共7页Port & Waterway Engineering

基　　金：国家重点基础研究发展计划(973计划)项目(2015CB057705)。

摘　　要：为研究规则波作用下方形排柱附近流动特性,基于计算流体力学软件FLOW-3D,运用质量源造波方法,离散RNG k-ε方程控制下的雷诺时均Navier-Stokes方程建立无反射三维数值波浪水槽。与物理模型试验结果对比,建立的数值模型性能良好。运用数值计算结果,分析排柱周围自由表面三维运动特征和方形排柱周围速度场与涡量场分布特性,采用无量纲方法分析方形排柱后方波浪透射系数K_(t)的变化规律。结果表明:规则波作用下方形排柱周围流场呈周期性变化规律,最大涡量值在方形排柱单柱的上下游角隅区交替出现。在数值模拟试验范围内,透射系数K_(t)随波陡H_(L)的变化略有波动,但不显著;透射系数K_(t)随相对水深d_(L)的增大逐步减小。To study flow characteristics around square columns under regular waves,this paper establishes a non-reflective three-dimensional(3D)numerical wave flume with a mass-source wave generation method and the Reynolds time-averaged Navier-Stokes equation under the constraint of a RNG k-εturbulence model in FLOW-3D.The built numerical model works well compared with the physical model.With the results of numerical calculations,the paper analyzes the 3D motion characteristics of the free surface around columns and the distribution characteristics of the velocity field and vorticity field around square columns.The changing law of the wave transmission coefficient K_(t)behind the square columns is explored using a dimensionless method.The results show that the flow field around the square columns changes periodically under regular waves,and the maximum vorticity alternately appears at the upper and lower corners of a single column among the square columns.Within the scope of the numerical simulation test,K_(t)fluctuates slightly with the change of the wave steepness H_(L)but not significantly and gradually decreases with the increase in the relative water depth d_(L).

关 键 词：方柱 规则波 水流特性 透射系数 数值模拟 

分 类 号：TV92[水利工程—水利水电工程] U656[交通运输工程—港口、海岸及近海工程]