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Coherent Structures in Transition of a Flat-Plate Boundary Layer at Ma =0.7 |
| ZHOU Ying; LI Xin-Liang;FU De-Xun; MA Yan-Wen |
| State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 10080 |
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| Cite this article: |
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ZHOU Ying, LI Xin-Liang, FU De-Xun et al 2007 Chin. Phys. Lett. 24 147-150 |
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Abstract Direct numerical simulation (DNS) of a spatially evolving flat-plate boundary layer transition process at free stream Mach number 0.7 is performed. Tollmien--Schlichting (T-S) waves are added on the inlet boundary as the disturbances before transition. Typical coherent structures in the transition process are investigated based on the second invariant of velocity gradient tensor. The instantaneous shear stress and the mean velocity profile in the transition region are studied. In our view, the fact that the peak value of shear stress in the stress concentration area increases and exceeds a threshold value during the later stage of the transition process plays an important role in the laminar breakdown process.
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| Keywords:
47.27.Cn
47.27.De
47.27.Nb
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Published: 01 January 2007
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