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Applied Scientific Research

, Volume 55, Issue 4, pp 311–326 | Cite as

Turbulent drag reduction by spanwise wall oscillations

  • Arturo Baron
  • Maurizio Quadrio
Article

Abstract

In the present work a technique is numerically investigated, which is aimed at reducing the friction drag in turbulent boundary layers and channel flows. A cyclic spanwise oscillation of the wall with a proper frequency and amplitude is imposed, allowing a reduction of the turbulent drag of up to 40%. The present work is based on the numerical simulation of the Navier-Stokes equations in the simple geometry of a plane channel flow. The frequency of the oscillations is kept fixed at the most efficient value determined in previous studies, while the choice of the best value for the amplitude of the oscillations is evaluated not only in terms of friction reduction, but also by taking into consideration the overall energy balance and the power spent for the motion of the wall. The analysis of turbulence statistics allows to shed some light on the way oscillations interact with wall turbulence, as illustrated by visual inspection of some instantaneous flow fields. Finally, a simple explanation is proposed for this interaction, which leads to a rough estimate of the most efficient value for the frequency of the oscillations.

Key words

turbulence turbulent drag reduction 

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References

  1. 1.
    Sendstad, O. and Moin, P.,On the Mechanics of 3-D Turbulent Boundary Layer. Proceedings of the Eight Symp. on Turbulent Shear Flows, Munich, 1991.Google Scholar
  2. 2.
    Bradshaw, P. and Pontikos, N.S., Measurements in the turbulent boundary layer over an ‘infinite’ swept wing.Journal of Fluid Mechanics 159 (1985) 105–130.Google Scholar
  3. 3.
    Jung, W.J., Mangiavacchi, N. and Akhavan, R., Suppression of turbulence in wall-bounded flows by high-frequency spanwise oscillations.Physics of Fluids A 4(8) (1992) 1605–1607.Google Scholar
  4. 4.
    Laadhari, F., Skandaji, L. and Morel, R., Turbulence reduction in a boundary layer by a local spanwise oscillating surface.Physics of Fluids A 6(10) (1994) 3218–3220.Google Scholar
  5. 5.
    Robinson, S.K., Coherent motions in the turbulent boundary layer.Annual Review of Fluid Mechanics 23 (1991) 601–639.Google Scholar
  6. 6.
    Kim, J., Moin, P. and Moser, R., Turbulence statistics in fully developed channel flow at low Reynolds number.Journal of Fluid Mechanics 177 (1987) 133–166.Google Scholar
  7. 7.
    Kim, J. and Moin, P., Numerical investigation of turbulent channel flow.Journal of Fluid Mechanics 118 (1982) 341–377.Google Scholar
  8. 8.
    Jiménez, J. and Moin, P., The minimal flow unit in near-wall turbulence.Journal of Fluid Mechanics 225 (1991) 213–240.Google Scholar
  9. 9.
    Baron, A. and Quadrio, M., Direct numerical simulation of turbulent flows under theNarrow Channel assumption.L'Aerotecnica Missili e Spazio 73(1) (1994) 3–13.Google Scholar
  10. 10.
    Choi, K.-S., Near-wall structure of a turbulent boundary layer with riblets.Journal of Fluid Mechanics 208 (1989) 417–458.Google Scholar
  11. 11.
    Mansour, N.N., Kim, J. and Moin, P., Reynolds-stress and dissipation-rate budgets in a turbulent channel flow.Journal of Fluid Mechanics 194 (1988) 15–44.Google Scholar
  12. 12.
    Schlichting, H.,Boundary Layer Theory. New York: McGraw-Hill (1968).Google Scholar

Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • Arturo Baron
    • 1
  • Maurizio Quadrio
    • 1
  1. 1.Dipartimento di Ingegneria AerospazialePolitecnico di MilanoMilanoItaly

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