The investigation of coherent structures in the wall region of a supersonic turbulent boundary layer based on DNS database

查看全文 作　　者：HUANG [1,2]ZhangFeng;ZHOU [1,2]Heng;LUO [1,2]JiSheng

机构地区：[1]Department of Mechanics,Tianjin University,Tianjin 300072,China;[2]Liu-Hui Center of Applied Mathematics,Nankai University and Tianjin University,Tianjin 300072,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》索引2007年第50卷第3期,共9页

基　　金：Supported by the National Natural Science Foundation of China (Grant No. 90205021);the Foundation for the Author of National Excellent Doctoral Dissertation of China (Grant No. 200328);Liu-Hui Center of Applied Mathematics, Nankai University and Tianjin University 摘　　要：Through temporal mode direct numerical simulation, flow field database of a fully developed turbulent boundary layer on a flat plate with Mach number 4.5 and Reynolds number Reθ =1094 has been obtained. Commonly used detection meth- ods in experiments are applied to detecting coherent structures in the flow field, and it is found that coherent structures do exist in the wall region of a supersonic turbulent boundary layer. The detected results show that a low-speed streak is de- tected by using the Mu-level method, the rising parts of this streak are detected by using the second quadrant method, and the crossing regions from a low-speed streak to the high-speed one are detected by using the VITA method respectively. Notwithstanding that different regions are detected by different methods, they are all accompanied by quasi-stream-wise vortex structures. 关键词：COHERENT structure TURBULENCE CONDITIONAL sampling method SUPERSONIC boundary layer direct numerical simulation

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The investigation of coherent structures in the wall region of a supersonic turbulent boundary layer based on DNS database

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