截面形状对平坦壁面上柱状粗糙元周围垂向流速的影响  

Effect of Cross-Sectional Shape on Vertical Flow Velocity around Cylindrical Rough Elements Mounted on a Flat Wall

作　　者：傅林涛 FU Lintao(School of Architecture and Civil Engineering,Chengdu University,Chengdu 610106,China)

机构地区：[1]成都大学建筑与土木工程学院,四川成都610106

出　　处：《成都大学学报(自然科学版)》2025年第1期80-86,共7页Journal of Chengdu University(Natural Science Edition)

基　　金：成都大学高层次人才培育项目(2081921086)。

摘　　要：边界层中流场与壁面粗糙元的相互作用对壁面颗粒物质的输运起着重要作用.尽管关于边界层流动中壁面有限长柱体粗糙元周围流场的研究已有很多,但对柱体截面形状的影响认识尚不全面.采用K-epsilon湍流模型数值模拟了大气边界层中高度和迎风宽度分别为0.5 m和1 m的不同截面形状柱体粗糙元与流场的相互作用,分析了穿过柱体中轴面内的垂向流速对截面形状改变的响应.结果表明,截面形状对柱体粗糙元周围垂向流速的分布和大小均有影响,并且在粗糙元迎风和背风区内的最大垂向流速(包括正向和反向)对截面形状改变的响应存在定性或定量差异.这些结果可提升对边界层中壁面上障碍物附近的沙尘及其他有害微颗粒释放和输运机制的认识.The interaction between the flow field and the roughness element mounted on a flat wall in the boundary layer plays an important role in the transport of particles near the wall.Although there have been many studies on the flow field around a finite length cylindrical rough element in boundary layer flow,our understanding of the influence of the cross-sectional shape of the cylindrical body is not yet comprehensive.By employing the standard K-epsilon turbulence model,this work numerically simulated the interaction between the flow field and the rough elements of different cross-sectional shapes with a height and windward width of 0.5 m and 1 m in the atmospheric boundary layer.The response of vertical flow velocity in the vertical plane flowing through the center of the cylinder to changes in cross-sectional shape was analyzed.The results indicate that the cross-sectional shape has an impact on the distribution and magnitude of vertical flow velocity around single rough elements,and there are qualitative or quantitative differences in the response of the maximum vertical flow velocity(including forward and reverse).These results can enhance the understanding of the mechanism of the release and transport of dust and other harmful micro-particles near obstacles on the wall in the boundary layer.

关 键 词：流速分布 数值模拟 迎风和背风区 颗粒释放和输运 

分 类 号：X513[环境科学与工程—环境工程]