均匀剪切稳定分层流动中湍流特性的数值研究  

Large Eddy Simulation of Turbulence Properties in a Uniformly Sheared and Stably Stratified Flow

作　　者：贾俊梅[1] 刘宇陆[2] 

机构地区：[1]内蒙古工业大学理学院,呼和浩特010052 [2]上海大学上海市应用数学与力学研究所,上海200072

出　　处：《内蒙古大学学报（自然科学版）》2012年第1期52-58,共7页Journal of Inner Mongolia University：Natural Science Edition

摘　　要：采用大涡模拟的方法,研究了均匀剪切稳定分层流动.主要对不同梯度Richardson数下湍流动量和标量输运特性进行分析研究.结果表明:随着梯度Richardson数的增大,湍流动能减小,湍流势能增大;垂向热通量和雷诺应力减弱,流向热通量增强;并且在强分层情况下,存在动量和热量的逆梯度输运现象.LES method is applied to study the sheared homogeneous stratified turbulent flows.The turbulent momentum and scalar transport properties of different gradient Richardson numbers are mainly analyzed.The primary conclusions are:with the increase of gradient Richardson number,turbulent kinetic energy decreases,while the turbulent potential energy increases;vertical heat flux and the Reynolds stress decrease,but the streamwise heat flux increases;Turbulent momentum and heat CGT in strong stratification are more obvious than those of the weak stratified turbulence.

关 键 词：分层湍流 梯度Richardson数 湍流输运 大涡模拟 

分 类 号：O357.5[理学—流体力学]