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Particle image velocimetry investigation of a turbulent boundary layer manipulated by spanwise wall oscillations

Published online by Cambridge University Press:  24 September 2002

GAETANO MARIA DI CICCA ,
GAETANO IUSO ,
PIER GIORGIO SPAZZINI  and
MICHELE ONORATO
GAETANO MARIA DI CICCA
Affiliation:
Dipartimento di Ingegneria Aeronautica e Spaziale, Politecnico di Torino, C.so Duca degli Abruzzi, 24, I 10129 Torino, Italy
GAETANO IUSO
Affiliation:
Dipartimento di Ingegneria Aeronautica e Spaziale, Politecnico di Torino, C.so Duca degli Abruzzi, 24, I 10129 Torino, Italy
PIER GIORGIO SPAZZINI
Affiliation:
CNR-CSDF c/o Dipartimento di Ingegneria Aeronautica e Spaziale, Politecnico di Torino, C.so Duca degli Abruzzi, 24, I 10129 Torino, Italy
MICHELE ONORATO
Affiliation:
Dipartimento di Ingegneria Aeronautica e Spaziale, Politecnico di Torino, C.so Duca degli Abruzzi, 24, I 10129 Torino, Italy
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Abstract

Particle image velocimetry has been applied to the study of a canonical turbulent boundary layer and to a turbulent boundary layer forced by transversal wall oscillations. This work is part of the research programme at the Politecnico di Torino aerodynamic laboratory with the objective of investigating the response of near-wall turbulence to external perturbations. Results are presented for the optimum oscillation period of 100 viscous time units and for an oscillation amplitude of 320 viscous units. As expected, turbulent velocity fluctuations are considerably reduced by the wall oscillations. Particle image velocimetry has allowed comparisons between the canonical and forced flows in an attempt to find the physical mechanisms by which the wall oscillation influences the near-wall organized motions.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 467 , 25 September 2002 , pp. 41 - 56
Copyright
© 2002 Cambridge University Press

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