Large eddy simulation of turbulent statistical and transport properties in stabl

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Large eddy simulation of turbulent statistical and transport properties in stably stratified flows

Three dimensional large eddy simulation (LES) is performed in the inves-tigation of stably stratified turbulence with a sharp thermal interface. Main results are focused on the turbulent characteristic scale, statistical properties, transport properties,and temporal and spatial evolution of the scalar field. Results show that the buoyancy scale increases first, and then goes to a certain constant value. The stronger the mean shear, the larger the buoyancy scale. The overturning scale increases with the flow, and the mean shear improves the overturning scale. The flatness factor of temperature de-parts from the Ganssian distribution in a fairly large region, and its statistical properties are clearly different from those of the velocity fluctuations in strong stratified cases. Tur-bulent mixing starts from small scale motions, and then extends to large scale motions.

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作 者: Xiang QIU Yong-xiang HUANG Zhi-ming LU Yu-lu LIU  
作者单位:Xiang QIU(Shanghai Institute of Applied Mathematicsand Mechanics,Shanghai University,Shanghai 200072,P.R.China;Department of Mathematics, School of Sciences, Shanghai University,Shanghai 200444, P. R. China)水利论文~q:Rqr^Ftu
Yong-xiang HUANG,Zhi-ming LU,Yu-lu LIU(Department of Mathematics,School of Sciences,Shanghai University,Shanghai 200444,P.R.China) 
刊 名:应用数学和力学(英文版)  EI SCI
英文刊名:APPLIED MATHEMATICS AND MECHANICS 
年,卷(期):2009 30(2) 
分类号:O1 
关键词:stratified turbulence   turbulent mixing   turbulent transport   turbulence structure  
机标关键词:statistical propertiesstratified turbulencelarge eddy simulationspatial evolutionflatness factorscalar field 
基金项目:国家自然科学基金 
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