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On the generation of high-amplitude wall-pressure peaks in turbulent boundary layers and spots

Published online by Cambridge University Press:  21 April 2006

Arne V. Johansson ,
Jen-Yuan Her  and
Joseph H. Haritonidis
Arne V. Johansson
Affiliation:
Department of Aeronautics and Astronautics, Massachussetts Institute of Technology, Cambridge, MA 02139, USA Permanent address: Department of Mechanics, The Royal Institute of Technology, S-100 44 Stockholm, Sweden.
Jen-Yuan Her
Affiliation:
Department of Aeronautics and Astronautics, Massachussetts Institute of Technology, Cambridge, MA 02139, USA
Joseph H. Haritonidis
Affiliation:
Department of Aeronautics and Astronautics, Massachussetts Institute of Technology, Cambridge, MA 02139, USA
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Abstract

The coupling between high-amplitude wall-pressure peaks and flow structures, especially in the near-wall region, was studied for a zero-pressure-gradient turbulent-boundary-layer flow and for the flow in the interior of artificially generated turbulent spots. By use of an ‘enhanced’ conditional averaging technique it was shown that buffer region shear-layer structures are to a high degree responsible for the generation of large positive wall-pressure peaks. The relation was proved to be bi-directional in that strong shear layers were shown to accompany positive pressure peaks and correspondingly that large pressure peaks were associated with shear-layer structures detected in the buffer region. This also indicates a link between the wall-pressure peaks and turbulence-producing mechanisms. The pressure-peak amplitude was found to scale linearly with the velocity amplitude of the generating flow structure, indicating that a dominating role here is played by the so-called turbulence – mean shear interaction. The large negative wall-pressure peaks were found to be associated primarily with sweep-type motions. All essential features of the relation between wall-pressure peaks and flow structures in artificially generated spots in a laminar boundary layer were found to be identical to those in the equilibrium turbulent boundary layer.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 175 , February 1987 , pp. 119 - 142
Copyright
© 1987 Cambridge University Press

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