非等温流向振荡单圆柱绕流的格子Boltzmann模拟  

Lattice Boltzmann Simulation of the Convective Heat Transfer From a Streamwise Oscillating Circular Cylinder

作　　者：包胜[1] 陈胜[1] 柳朝晖[1] 易超[1] 郑楚光[1] 

机构地区：[1]华中科技大学煤燃烧国家重点实验室,湖北武汉430074

出　　处：《工程热物理学报》2012年第7期1181-1184,共4页Journal of Engineering Thermophysics

基　　金：国家重大基础研究专项基金(No.2010CB227004);国家自然科学基金项目(Nos.50936001;50976042;51021065;51176061)

摘　　要：本文采用格子Boltzmann方法模拟对非等温横向振荡圆柱绕流(Re=100)进行模拟,详细考察振荡频率(F=f_o/f_s=0.2～8.0)、振幅(A/D=0.1～0.4,A为圆柱流向最大位移,D为圆柱直径)对绕流换热的影响。结果表明:低频率、低振幅流向振荡运动将使圆柱换热增强,高频率、高振幅振荡使圆柱换热效果减弱;圆柱表面平均N_u脉动均方根值随着振荡频率、振幅的增大而增大;在锁定区域内,平均N_u及其脉动均方根值均出现极大值。In this paper,we studied the convective heat transfer from a stream-wise oscillating circular cylinder.Two dimensional numerical simulations are conducted at Re=100～200,A/D=0.1～0.4 and F=f_o/f_s=0.2～3.0 using lattice Boltzmann method.The results show that：First,the heat transfer is enhanced when the cylinder oscillates stream-wise with small amplitude and low frequency.On the contrary,it is reduced.Second,the average Nusselt number（Nu）shows a decrease with the increasing value of oscillation frequency,while the RMS value of Nusselt number displays an opposite trend.Third,we obtained local maximum values of the time average and RMS of the Nusselt number.

关 键 词：流向振荡 非等温 格子BOLTZMANN Nu数 频谱分析 

分 类 号：TK16[动力工程及工程热物理—热能工程]