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Chin. Phys. B, 2018, Vol. 27(8): 084701    DOI: 10.1088/1674-1056/27/8/084701

A new kind of hairpin-like vortical structure induced by cross-interaction of sinuous streaks in turbulent channel

Jian Li(李健)1, Gang Dong(董刚)2, Hui Zhang(张辉)2, Zhengshou Chen(陈正寿)1,3, Zhaode Zhang(张兆德)1,3
1 School of Naval Architecture and Mechanical-electrical Engineering, Zhejiang Ocean University, Zhoushan 316022, China;
2 National Key Laboratory of Transient Physics, Nanjing University of Science and Technology, Nanjing 210094, China;
3 Key Laboratory of Offshore Engineering Technology of Zhejiang Province, Zhoushan 316022, China
Abstract  This work is motivated by previous experimental and numerical studies which reveal that the hairpin vortex could be formed by the interaction between spanwise adjacent low-speed streaks. To prove that such an interaction mechanism is still applicable in the normal direction, two sinuous low-speed streaks with the same streamwise phase are set to be in the upper half and bottom half of a small size channel, respectively, and their evolution and interaction are investigated by direct numerical simulation. A new kind of hairpin-like vortical structure, distributed in the normal direction and straddled across both halves of the channel, is found during the cross-interaction process of the low-speed streaks. The influence of such a normal-distributed hairpin-like vortex (NHV) on the turbulent statistical regularity is also revealed. It is observed that the NHV can lead to a sudden surge of wall skin friction, but the value of the normal velocity as well as the streamwise and spanwise vorticity sharply decrease to zero in the center of the channel.
Keywords:  low-speed streaks      hairpin vortex      channel flow      direct numerical simulation  
Received:  30 January 2018      Revised:  26 March 2018      Accepted manuscript online: 
PACS:  47.27.De (Coherent structures)  
  47.27.nd (Channel flow)  
  47.32.cb (Vortex interactions)  
Fund: Project supported by the Natural Science Foundation of Zhejiang Province, China (Grant No. LQ18A020002), the National Natural Science Foundation of China (Grant No. 41776105), and the Foundation of the Educational Committee of Zhejiang Province, China (Grant No. Y201737053).
Corresponding Authors:  Gang Dong     E-mail:

Cite this article: 

Jian Li(李健), Gang Dong(董刚), Hui Zhang(张辉), Zhengshou Chen(陈正寿), Zhaode Zhang(张兆德) A new kind of hairpin-like vortical structure induced by cross-interaction of sinuous streaks in turbulent channel 2018 Chin. Phys. B 27 084701

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