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Control of the secondary cross-flow instability using localized suction

Published online by Cambridge University Press:  13 July 2012

Tillmann Friederich  and
Markus J. Kloker
Tillmann Friederich
Affiliation:
Institut für Aerodynamik und Gasdynamik, Universität Stuttgart, Pfaffenwaldring 21, D-70550 Stuttgart, Germany
Markus J. Kloker*
Affiliation:
Institut für Aerodynamik und Gasdynamik, Universität Stuttgart, Pfaffenwaldring 21, D-70550 Stuttgart, Germany
*
†Email address for correspondence: kloker@iag.uni-stuttgart.de
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Abstract

Transition control by suction in a three-dimensional boundary-layer flow subject to cross-flow instability is investigated using direct numerical simulation. Whereas the classical application of (homogeneous) suction at the wall is aimed at modifying the quasi-two-dimensional base flow to weaken primary cross-flow instability, here the three-dimensional nonlinear disturbance state with large-amplitude steady cross-flow vortices (CFVs) is controlled. Strong, localized ‘pinpoint’ suction is shown to be suitable for altering the CFVs and the associated flow field such that secondary instability is weakened or even completely suppressed. Thus significant delay of transition to turbulence can be achieved.

JFM classification

Flow Control: Drag reduction Flow Control: Instability control Instability: Transition to turbulence
Type
Papers
Information
Journal of Fluid Mechanics , Volume 706 , 10 September 2012 , pp. 470 - 495
Copyright
Copyright © Cambridge University Press 2012

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Friedrich and Klocker supplementary movie

Pinpoint suction with three holes for case 3-H (visualisation of vortical structures using the λ2-criterion).

Download Friedrich and Klocker supplementary movie(Video)
Video 10.9 MB

Friedrich and Klocker supplementary movie

Pinpoint suction with three holes for case 3-H (visualisation of vortical structures using the λ2-criterion).

Download Friedrich and Klocker supplementary movie(Video)
Video 23.3 MB

Friedrich and Klocker supplementary movie

Pinpoint suction with three shifted holes for case 3-H* (visualisation of vortical structures using the λ2-criterion).

Download Friedrich and Klocker supplementary movie(Video)
Video 13.1 MB

Friedrich and Klocker supplementary movie

Pinpoint suction with three shifted holes for case 3-H* (visualisation of vortical structures using the λ2-criterion).

Download Friedrich and Klocker supplementary movie(Video)
Video 23.5 MB

Friedrich and Klocker supplementary movie

Pinpoint suction with nine holes for case 9-H (visualisation of vortical structures using the λ2-criterion).

Download Friedrich and Klocker supplementary movie(Video)
Video 9.4 MB

Friedrich and Klocker supplementary movie

Pinpoint suction with nine holes for case 9-H (visualisation of vortical structures using the λ2-criterion).

Download Friedrich and Klocker supplementary movie(Video)
Video 18.7 MB