摘要
基于标准k-ε湍流模型,在亚临界雷诺数(Re=3900)下对不同表面粗糙度和间隙比的圆柱绕流进行数值模拟研究,分析粗糙度与间隙比同步作用下尾流涡和升阻力系数的特性。研究发现:在相同粗糙度下,随着间隙比的增大,升力系数幅值CL,AM先增大后减小;当粗糙程度K_(S)/D≤1.0×10^(-2)时,阻力系数均值C_(D,mean)随间隙比的增大先增大后减小;当K_(S)/D≥1.5×10^(-2)时,C_(D,mean)随间隙比的增大基本上呈减小的趋势(圆柱间隙比h/D=0.3、K_(S)/D=1.5×10^(-2)的情况除外);当h/D=0.1时,由于壁面的影响,圆柱下游形成驻涡;当0.11.0时,壁面的影响减弱,圆柱下游脱涡模式逐渐变为2S模式,主要影响因素为粗糙度。
Based on standard k-ε,the two-dimensional flow around a circular cylinder with different surface roughness and gap ratio is numerically simulated at a subcritical Reynolds number of 3900.The effects of surface roughness and gap ratio on the wake vortex,lift and drag coefficient are analyzed.The study found that under the same roughness,as the gap ratio increases,C_(L,AM) first increases and then decreases.When K_(S)/D≤1×10^(-2),with the increase of the gap ratio,C_(D,mean) first increases and then decreases.But when K_(S)/D≥1.5×10^(-2),with the increase of the gap ratio,C_(D.mean) basically shows a decreasing trend(except h/D=0.3、K_(S)/D-1.5×10^(-2)).When h/D=0.1,due to the influence of the wall,a trapped vortex is formed downstream of the cylinder.When 0.1<h/D≤0.5,due to the influence of the wall surface,the vortex near the wall recedes.At this time,the gap ratio has a greater influence on the lift coefficient,drag coefficient,vorticity field and vortex shedding frequency.When 0.5<h/D<1,both wall surface and roughness have a greater impact.But when h/D>1.o,the influence of the wall surface is weakened,the vortex shedding mode downstream of the cylinder gradually changes to 2S mode,and the main influencing factor becomes roughness.
作者
韩晨健
刘在良
刘二朋
陈威
林永水
李晓彬
HAN Chenjan;LIU Zailiang;LIU Erpeng;CHEN Wei;LIN Yongshui;LI Xiaobin(Zhoushan Office,China Classification Society,Zhoushan 316000,Zhejiang,China;Zhejiang International Maritime College,Zhoushan 316000,Zhejiang,China;Wuhan University of Technology,School of Science,Ocean and Energy Power Engineering,Wuhan 430063,China;Wuhan University of Technology,School of Naval Architecture,Ocean and Energy Power Engineering,Wuhan 430063,China)
出处
《船舶工程》
CSCD
北大核心
2023年第3期181-187,共7页
Ship Engineering
基金
湖北省自然科学基金(2021CFB064)
国家自然科学基金(51979213,52201334)。
关键词
圆柱绕流
表面粗糙度
亚临界雷诺数
数值模拟
间隙比
flow around circular cylinder
surface roughness
subcritical Reynolds number
numerical simulation
gap ratio
