Journal
JOURNAL OF FLUID MECHANICS
Volume 658, Issue -, Pages 310-335Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S0022112010001758
Keywords
boundary-layer transition; instability; streaks; turbulent spots
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This paper presents analyses of particle image velocimetry measurements from a boundary layer on a flat plate subject to grid-generated free-stream turbulence. The pre-transition region and early stages of breakdown to turbulent spots are explored by means of quadrant analysis and quadrant hole analysis. By isolating the contributors to the Reynolds shear stresses, it is possible to identify coherent structures within the flow that are responsible for the production of TKE. It is found that so called 'ejection' events are the most significant form of disturbance, exhibiting the largest amplitude behaviour with increased negative spanwise vorticity. Sweep events become increasingly large close to the wall with increased Reynolds number and intermittency.
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