弱分层湍流输运特性的统计分析  

Statistical Analysis of Transport Properties in Weakly Stratified Turbulence

作　　者：邱翔[1] 侯志芳[1] 朱龙[2] 马皓[2] 刘宇陆[1] 

机构地区：[1]上海应用技术学院理学院,上海201418 [2]上海应用技术学院机械工程学院,上海201418

出　　处：《上海应用技术学院学报（自然科学版）》2014年第1期41-46,共6页Journal of Shanghai Institute of Technology: Natural Science

基　　金：国家自然科学基金资助项目(1102114;11172179;11332006);上海市教委科研创新资助项目(13YZ124);上海应用技术学院引进人才基金资助项目(YJ2011-02)

摘　　要：采用大涡模拟(LES)方法对弱分层湍流进行了数值模拟研究,针对弱分层湍流的统计特性、垂向热通量、流场的各向异性特征进行了分析,得到如下主要结论:弱分层条件对湍流强度有微弱的抑制作用,温度脉动较速度脉动的演化有明显滞后现象;脉动强度和垂向热通量沿流向呈明显的衰减规律;温度作为主动标量或被动标量考虑时对湍流的统计特性无明显影响.Weakly stratified turbulence had been studied by using large eddy simulation(LES),the main contents of the simulation study focused on statistical properties,vertical heat flux,and anisotropy of stratified turbulent field.The results indicated that turbulent intensities had been suppressed in weakly stratified condition,temperature fluctuation was obviously delayed compared to velocity fluctuation.Turbulent intensities and vertical heat flux showed decaying obviously in streamwise direction.It displayed no difference in turbulent statistical properties when the temperature was considered as active scalar or passive scalar.

关 键 词：分层湍流 大涡模拟 主动标量 被动标量 

分 类 号：O357.5[理学—流体力学]