Skip to main content
×
Home
    • Aa
    • Aa

An experimental study of boundary layer transition induced by a cylinder wake

  • A. C. Mandal (a1) and J. Dey (a1)
Abstract
Abstract

Boundary layer transition induced by the wake of a circular cylinder in the free stream has been investigated using the particle image velocimetry technique. Some differences between simulation and experimental studies have been reported in the literature, and these have motivated the present study. The appearance of spanwise vortices in the early stage is further confirmed here. A spanwise vortex appears to evolve into a /hairpin vortex; the flow statistics also confirm such vortices. With increasing Reynolds number, based on the cylinder diameter, and with decreasing cylinder height from the plate, the physical size of these hairpin-like structures is found to decrease. Some mean flow characteristics, including the streamwise growth of the disturbance energy, in a wake-induced transition resemble those in bypass transition induced by free stream turbulence. Streamwise velocity streaks that are eventually generated in the late stage often undergo sinuous-type oscillations. Similar to other transitional flows, an inclined shear layer in the wall-normal plane is often seen to oscillate and shed vortices. The normalized shedding frequency of these vortices, estimated from the spatial spacing and the convection velocity of these vortices, is found to be independent of the Reynolds number, similar to that in ribbon-induced transition. Although the nature of free stream disturbance in a wake-induced transition and that in a bypass transition are different, the late-stage features including the flow breakdown characteristics of these two transitions appear to be similar.

Copyright
Corresponding author
Email address for correspondence: alakesh@aero.iisc.ernet.in
Linked references
Hide All

This list contains references from the content that can be linked to their source. For a full set of references and notes please see the PDF or HTML where available.

11. T. L. Doligalski , C. R. Smith & J. D. A. Walker 1994 Vortex interactions with walls. Annu. Rev. Fluid Mech. 26, 573616.

15. P. A. Elofsson , M. Kawakami & P. H. Alfredsson 1999 Experiments on the stability of streamwise streaks in plane Poiseuille flow. Phys. Fluids 11, 915930.

20. Y. S. Kachanov 1994 Physical mechanism of laminar-boundary-layer transition. Annu. Rev. Fluid Mech. 26, 411482.

22. Y. Konishi & M. Asai 2010 Development of subharmonic disturbance in spanwise-periodic low-speed streaks. Fluid Dyn. Res. 42, 035504.

25. N. K. Kyriakides , E. G. Kastrinakis , S. G. Nychas & A. Goulas 1999 Aspects of flow structure during a cylinder wake-induced laminar/turbulent transition. AIAA J. 37, 11971205.

26. C. B. Lee & J. Z. Wu 2008 Transition in wall-bounded flows. Appl. Mech. Rev. 61, 030802.

33. J. Mans , E. C. Kadijk , H. C. de Lange & A. A. van Steenhoven 2005 Breakdown in a boundary layer exposed to free-stream turbulence. Exp. Fluids 39, 10711083.

34. J. Mans , H. C. de Lange & A. A. van Steenhoven 2007 Sinuous breakdown in a flat plate boundary layer exposed to free-stream turbulence. Phys. Fluids 19, 088101.

37. M. V. Morkovin 1969 The many faces of transition. In Viscous Drag Reduction (ed. C. S. Wells ). Plenum.

45. S. Pellerin & A. Giovannini 1999 Interaction vortex – boundary layer: numerical study of wall mechanisms. ESAIM: Proc. 7, 325334.

52. P. Schlatter , L. Brandt , H. C. de Lange & D. S. Henningson 2008 On streak breakdown in bypass transition. Phys. Fluids 20, 101505.

54. B. A. Singer 1996 Characteristics of a young turbulent spot. Phys. Fluids 8, 509521.

55. L. C. Squire 1989 Interactions between wakes and boundary layers. Prog. Aerosp. Sci. 26, 261288.

56. A. Svizher & J. Cohen 2006 Holographic particle image velocimetry measurements of hairpin vortices in subcritical air channel flow. Phys. Fluids 18, 014105.

Recommend this journal

Email your librarian or administrator to recommend adding this journal to your organisation's collection.

Journal of Fluid Mechanics
  • ISSN: 0022-1120
  • EISSN: 1469-7645
  • URL: /core/journals/journal-of-fluid-mechanics
Please enter your name
Please enter a valid email address
Who would you like to send this to? *
×
MathJax

Keywords:

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 44 *
Loading metrics...

Abstract views

Total abstract views: 101 *
Loading metrics...

* Views captured on Cambridge Core between September 2016 - 23rd March 2017. This data will be updated every 24 hours.