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

The investigation of coherent structures in the wall region of a supersonic turbulent boundary layer based on DNS database
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基于DNS数据库的超音速湍流边界层壁区相干结构研究

DOI:
10.1007/s11433-007-0024-z
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发表时间:
2007-06
期刊:
Science in China Series G-Physics Mechanics & Astronomy
影响因子:
--
通讯作者:
Luo, JiSheng
Luo, JiSheng
中科院分区:
其他
文献类型:
--
作者:
Huang, ZhangFeng;Zhou, Heng;Luo, JiSheng

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通过时间模直接数值模拟,获得了马赫数为4.5,雷诺数Re θ=1094的平板上充分发展湍流边界层的流场数据库。将实验中常用的检测方法应用于检测流场中的拟序结构,发现超声速湍流边界层壁面区域确实存在拟序结构。检测结果表明,采用Mu水平法检测出了低速条纹,采用第二象限法检测出了低速条纹的上升部分,采用VITA法检测出了低速条纹与高速条纹的交叉区域。尽管不同的区域被不同的方法探测到,但它们都伴随着准流向涡结构。
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 numberReθ=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.
DOI: --
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期刊: --
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