规则波作用下方形排柱附近水流特性数值模拟

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...

Numerical simulation of flow characteristics around square columns under regular waves

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_tbehind 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_tfluctuates slightly with the change of the wave steepness H_Lbut not significantly and gradually decreases with the increase in the relative water depth d_L.