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				Based on detailed results of direct numerical simulation with high order accuracy and resolution at the late-stages of the transitional boundary layer, new properties are found, such as discontinuous event in the evolution of low-speed streamwise streaks and the appearance called high speed spots in the development of high-speed streamwise streaks. In the present paper, the complex vortex structures and the ejection-sweep phenomenon in the transition process of boundary layers are analyzed thoroughly, and the new properties of high-speed /low-speed streamwise streaks are confirmed to be closely relatcd to the evolution process of vortex structures in the flow-field.- 
										Keywords:
										
- streamwise streaks /
- boundary layers /
- transition /
- direct numerical simulation
 [1] Klebanoff P S, Tidstrom K D, Sargent L M 1962 J. Fluid Mech. 12 1 [2] Kline S J, Reynolds W C, Schraub F A, Runstadler P W 1967 J. Fluid Mech. 30 741 [3] Landahl M T 1975 SIAM J. Appl Math. 28 735 [4] Landahl M T 1980 J. Fluid Mech. 98 243 [5] Li Z R, Ye J, Lu L P 2001 Journal of Engineering Thermophysics 22 563(in Chinese)[李兆瑞、 叶 剑、 陆利蓬 2001 工程热 22 563] [6] Lagraa B, Labraga L, Mazouz A 2004 European Journal of Mechanics B-Fluids. 23 587 [7] Andersson P, Brandt L, Bottaro A, Henningson, D S 2001 J. Fluid Mech. 428 29 [8] Brandt L, Henningson D S, Ponziani D 2002 Phys. Fluids 14 1426 [9] Brandt L 2007 European Journal of Mechanics B-Fluids 26 64 [10] Lee C B 2001 Acta Phys. Sin. 50 182 (in Chinese)[李存标 2001 50 182] [11] Lee C B, Wu J Z 2008 Applied Mechanics Reviews 61 3 [12] Konishi Y Asai M 2010 Fluid Dynamics Research 42 3 [13] Jiang L, Shan H, Liu C. 1999a Recent Advances in DNS and LES Proceedings of the Second AFOSR International Conference on DNS/LES, Rutgers-The State University of New Jersey, New Brunswick, U.S.A, June 7—9, 1999 [14] Lele S K. 1992 J. Comput. Phys. 103 16 [15] Shu CW, Osher S. 1988 J. Comput. Phys. 77 439 [16] Jiang L, Shan H, Liu C. 1999b Recent Advances in DNS and LES, Proceedings of the Second AFOSR International Conference on DNS/LES, Rutgers-The State University of New Jersey, New Brunswick, U.S.A., June 7—9, 1999 [17] Malik MR. 1990 Journal of Computational Physics 86 376 [18] Lee C B 2003 Chin. Phys. 12 1429 [19] Chen L, Tang D B, Liu X B, Oliveira M, Liu C Q 2010 Science in China(G) 53 514 [20] Jeong J, Hussain F 1995 J. Fluid Mech. 285 69 
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[1] Klebanoff P S, Tidstrom K D, Sargent L M 1962 J. Fluid Mech. 12 1 [2] Kline S J, Reynolds W C, Schraub F A, Runstadler P W 1967 J. Fluid Mech. 30 741 [3] Landahl M T 1975 SIAM J. Appl Math. 28 735 [4] Landahl M T 1980 J. Fluid Mech. 98 243 [5] Li Z R, Ye J, Lu L P 2001 Journal of Engineering Thermophysics 22 563(in Chinese)[李兆瑞、 叶 剑、 陆利蓬 2001 工程热 22 563] [6] Lagraa B, Labraga L, Mazouz A 2004 European Journal of Mechanics B-Fluids. 23 587 [7] Andersson P, Brandt L, Bottaro A, Henningson, D S 2001 J. Fluid Mech. 428 29 [8] Brandt L, Henningson D S, Ponziani D 2002 Phys. Fluids 14 1426 [9] Brandt L 2007 European Journal of Mechanics B-Fluids 26 64 [10] Lee C B 2001 Acta Phys. Sin. 50 182 (in Chinese)[李存标 2001 50 182] [11] Lee C B, Wu J Z 2008 Applied Mechanics Reviews 61 3 [12] Konishi Y Asai M 2010 Fluid Dynamics Research 42 3 [13] Jiang L, Shan H, Liu C. 1999a Recent Advances in DNS and LES Proceedings of the Second AFOSR International Conference on DNS/LES, Rutgers-The State University of New Jersey, New Brunswick, U.S.A, June 7—9, 1999 [14] Lele S K. 1992 J. Comput. Phys. 103 16 [15] Shu CW, Osher S. 1988 J. Comput. Phys. 77 439 [16] Jiang L, Shan H, Liu C. 1999b Recent Advances in DNS and LES, Proceedings of the Second AFOSR International Conference on DNS/LES, Rutgers-The State University of New Jersey, New Brunswick, U.S.A., June 7—9, 1999 [17] Malik MR. 1990 Journal of Computational Physics 86 376 [18] Lee C B 2003 Chin. Phys. 12 1429 [19] Chen L, Tang D B, Liu X B, Oliveira M, Liu C Q 2010 Science in China(G) 53 514 [20] Jeong J, Hussain F 1995 J. Fluid Mech. 285 69 
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