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Experimental investigation on coherent structures at early stage of boundary layer bypass transition induced by wake impingement

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Abstract

The early stage of a boundary layer bypass transition induced by the direct impingement of a circular cylinder wake is experimentally investigated in water tunnel, with the primary interest in both the evolution of coherent structures and their effects on the disturbance growth inside the boundary layer. It is found that spanwise vortices with small scale first form in the near-wall region around the leading-edge, which are either the residual of the wake rollers cut by the leading-edge or the high-order structures induced by the wake rollers. The formation of these spanwise vortices leads to the first rapid disturbance growth inside the boundary layer. On the other hand, streamwise vortices, which result from the impingement of longitudinal braids onto the leading-edge, are also observed inside the boundary layer. They lead to the three dimensional destabilization and the subsequent dispersion of spanwise vortices, and soon become the most dominant coherent structures inside the transitional boundary layer. It is suggested that the formation and evolution of these streamwise vortices contribute to the secondary disturbance growth stage and thus promote the completion of the transition process. The difference between the present transition scenario triggered by direct wake impingement and that by indirect wake-vortex inducement is further discussed.

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References

  1. Morkovin M V. On the Many Faces of Transition. In: Wells G S, ed. Viscous Drag Reduction. New York: Plenum Press, 1969

    Google Scholar 

  2. Harvey J K, Perry F J. Flowfield produced by trailing vortices in the vicinity of the ground. AIAA J, 1971, 9: 1659–1660

    Article  Google Scholar 

  3. Savill A M, Zhou M D. Wake/boundary layer and wake/wake interactions: Smoke flow visualization and modelling. In: Second Asian Congress of Fluid Mechanics, 1983

  4. Wang S F, Wang J J, Zhan J X. Characteristics of low-speed streaks in near-wall turbulence as disturbed by cylinder wakes (in Chinese). Experim Measurem Fluid Mech, 2003, 17: 45–48

    Google Scholar 

  5. Jiang N, Li Y L. Experimental study on coherent structures in wall turbulence interacting with a circular cylinder wake (in Chinese). J Experim Fluid Mech, 2007, 21: 8–13

    Google Scholar 

  6. Kyriakides N K, Kastrinakis E G, Nychas S G, et al. Aspects of flow structure during a cylinder wake-induced laminar/turbulent transition. AIAA J, 1999, 37: 1197–1205

    Article  Google Scholar 

  7. Ovchinnikov V, Piomelli U, Choudhari M M. Numerical simulations of boundary-layer transition induced by a cylinder wake. J Fluid Mech, 2006, 547: 413–441

    Article  MATH  Google Scholar 

  8. Pan C, Wang J J, Zhang P F, et al. Coherent structures in bypass transition induced by a cylinder wake. J Fluid Mech, 2008, 603: 367–389

    Article  MATH  Google Scholar 

  9. Wu X H, Jacobs R G, Hunt J C R, et al. Simulation of boundary layer transition induced by periodically passing wakes. J Fluid Mech, 1999, 398: 109–153

    Article  MATH  Google Scholar 

  10. Wu X H, Durbin P A. Evidence of longitudinal cortices evolved from distorted wakes in a turbine passage. J Fluid Mech, 2001, 446: 199–228

    MATH  Google Scholar 

  11. Durbin P A, Wu X H. Transition beneath vortical disturbances. Annu Rev Fluid Mech, 2007, 39: 107–128

    Article  MathSciNet  Google Scholar 

  12. Ersoy S, Walker J D A. The boundary layer due to a three-dimension vortex loop. J Fluid Mech, 1987, 185: 569–598

    Article  MATH  Google Scholar 

  13. Walker J D A, Smith C R, Cerra A W, et al. The inpact of a vortex on a wall. J Fluid Mech, 1987, 181: 99–140

    Article  Google Scholar 

  14. Peridier V J, Smith F T, Walker J D A. Vortex-induced boundary-layer separation. Part II. Unsteady interacting boundary-layer theory. J Fluid Mech, 1991, 232: 133–165

    Article  MathSciNet  MATH  Google Scholar 

  15. Chu C C, Falco R. E. Vortex ring/viscous wall layer interaction model of the turbulence. Exp Fluids, 1988, 6: 305–315

    Article  Google Scholar 

  16. Liu W, Domaradzki J A. Direct numerical simulation of transition to turbulence in Görtler flow. J Fluid Mech, 1993, 246: 267–299

    Article  MATH  Google Scholar 

  17. Pan C, Wang J J. Progress in bypass transition induced by free-stream disturbance (in Chinese). Adv Mech, 2011, 41: 668–685

    MathSciNet  Google Scholar 

  18. Goldstein M E, Wundrow D W. On the environmental realizability of algebraically growing disturbances and their relation to Klebanoff modes. Theor Comput Fluid Dyn, 1998, 10: 171–186

    Article  MATH  Google Scholar 

  19. Goldstein M E, Wundrow D W. Effect on a laminar boundary layer of small-amplitude streamwise vorticity in the upstream flow. J Fluid Mech, 2001, 426: 229–262

    Article  MathSciNet  MATH  Google Scholar 

  20. Williamson C H K. Vortex dynamics in the cylinder wake. Annu Rev Fluid Mech, 1996, 28: 477–539

    Article  Google Scholar 

  21. Huang J F, Zhou Y, Zhou T. Three-dimensional wake structure measurement using a modified PIV technique. Exp Fluids, 2006, 40: 884–896

    Article  Google Scholar 

  22. Scarano F, Poelma C. Three-dimensional vorticity patterns of cylinder wakes. Exp Fluids, 2009, 47: 69–83

    Article  Google Scholar 

  23. Zhou H, Zhao G F. Hydrodynamic Stability (in Chinese). Beijing: National Defense Industry Press, 2004

    Google Scholar 

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Authors and Affiliations

  1. Institute of Fluid Mechanics, Beijing University of Aeronautics & Astronautics, Key Laboratory of Fluid Mmechanics, Ministry of Education, Beijing, 100191, China

    Jun Wu, Chong Pan & Tian Li

  2. AVIC I Shenyang Aircraft Design and Research Institute, Shenyang, 110035, China

    Tian Li

Authors
  1. Jun Wu
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  2. Chong Pan
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  3. Tian Li
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Correspondence to Chong Pan.

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Wu, J., Pan, C. & Li, T. Experimental investigation on coherent structures at early stage of boundary layer bypass transition induced by wake impingement. Sci. China Technol. Sci. 55, 2981–2989 (2012). https://doi.org/10.1007/s11431-012-4976-5

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  • DOI: https://doi.org/10.1007/s11431-012-4976-5

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