| The investigation of coherent structures in the wall region of a supersonic turbulent boundary layer based on DNS database |
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| 作者姓名： | HUANG ZhangFeng ZHOU Heng & LUO JiSheng |
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| 作者单位： | HUANG ZhangFeng1，2，ZHOU Heng1，2 & LUO JiSheng1，2 1 Department of Mechanics，Tianjin University，Tianjin 300072，China; 2 Liu-Hui Center of Applied Mathematics，Nankai University and Tianjin University，Tianjin 300072，China |
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| 基金项目： | 国家自然科学基金;教育部全国优秀博士学位论文作者专项基金;南开大学校科研和教改项目;天津大学校科研和教改项目 |
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| 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.
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| 收稿时间： | 5 November 2005 |
| 修稿时间： | 29 September 2006 |
The investigation of coherent structures in the wall region of a supersonic turbulent boundary layer based on DNS database |
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| HUANG ZhangFeng,,ZHOU Heng, & LUO JiSheng, .The investigation of coherent structures in the wall region of a supersonic turbulent boundary layer based on DNS database[J].Science in China(Physics Astronomy),2007,50(3):348-356. |
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| Authors: | Huang ZhangFeng Zhou Heng Luo JiSheng |
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| Institution: | Department of Mechanics, Tianjin University, Tianjin 300072, China;Liu-Hui Center of Applied Mathematics, Nankai University and Tianjin University, Tianjin 300072, China |
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| Abstract: | 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 Re
θ
=1094 has been obtained. Commonly used detection methods 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 detected 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.
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), and Liu-Hui Center of Applied Mathematics, Nankai University
and Tianjin University |
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| Keywords: | coherent structure turbulence conditional sampling method supersonic boundary layer direct numerical simulation |
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