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Topology of a turbulent boundary layer with and without wall suction

Published online by Cambridge University Press:  21 April 2006

R. A. Antonia  and
L. Fulachier
R. A. Antonia
Affiliation:
Department of Mechanical Engineering, University of Newcastle, New South Wales, 2308, Australia
L. Fulachier
Affiliation:
Institut de Mécanique Statistique de la Turbulence, Université d'Aix-Marseille 13003, Marseille, France
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Abstract

Measurements of velocity and temperature fluctuations are made in a turbulent boundary layer with nominally zero pressure gradient for two different slightly heated wall conditions: impermeable and porous surfaces. The temperature fluctuations are measured at three points in the flow to permit the identification of two spatially coherent events: coolings and heatings. Conditional velocity vectors in the plane of mean shear are viewed in a reference frame which translates at a constant velocity. Conditioning is on coolings, heatings or a combination of these events. Sectional streamlines, derived from the velocity vector data, show a succession of critical points: saddles and unstable foci. Coolings are aligned with diverging separatrices through the saddles whereas heatings are identified with the foci. Coolings are associated with a large strain rate and also a large spanwise vorticity: this result seems consistent with the presence of hairpin vortices which extend to different distances from the wall. In contrast, the strain rate and spanwise vorticity are small at the foci. The stabilizing influence of suction is observed in the topology of the organized motion and in the contribution from this motion to the conventional stresses, temperature variance and heat fluxes.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 198 , January 1989 , pp. 429 - 451
Copyright
1989 Cambridge University Press

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