Advertisement

On The Mechanism Of Attenuation Of Turbulenci by Spanwise Wall Oscillation

  • Y. Miyake
  • K. Tsujimoto
  • M. Takahashi
Conference paper
Part of the ERCOFTAC Series book series (ERCO, volume 5)

Abstract

In this work, the mechanism of reduction of wall shear stress caused by spanwise oscillation of a wall is discussed by means of a DNS of a channel flow. For the case of wall oscillation where about 35% reduction in shear stress is attained, the detailed attenuation process of turbulence is discussed. It is demonstrated that the fall of production rate of quasi-streamwise vorticity due to stretching effect is substantial for the phenomenon. The periodical fluctuation of the attitude angle, i.e., the inclination angle to the wall and the slant angle of a vortex to the mean flow, enhances the production. This mechanism is a straightforward extension of the one commonly found in the usual near wall turbulence.

Keywords

Wall Shear Stress Direct Numerical Simulation Vortex Line Streamwise Vortex Stationary Wall 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Bradshaw, P. & Pontikos 1985: Measurements in the turbulent boundary layer on an ‘infinite’ swept wing. J. Fluid Mech. 159, 105–130.CrossRefADSGoogle Scholar
  2. Brooke, J.W. & Hanratty, T.J. 1993: Origin of turbulence-producing eddies in a channel flow. Phys. Fluids, A5-4 1011–1022.Google Scholar
  3. Jung, W.J., Mangiavacchi, N. & Akhavan, R. 1992: Suppression of turbulence in wall-boundes flows by high-frequency spanwise oscillations. Phys. Fluids, A4-8 1605–1608.CrossRefADSGoogle Scholar
  4. Laadhari, F., Skandaji, L. & Morel, R. 1994: Turbulence reduction in a boundary layer by a local spanwise oscillating surface. Phys. Fluids, A6-10 3218–3220.CrossRefADSGoogle Scholar
  5. Miyake, Y., Ushiro, R. & Morikawa, T. 1995: On regeneration of quasi-streamwise eddies. Proc. 10th Symp. Turb. Shear Flows, Penn.State, Aug.14–16, 1995, pp.15.7–15.12Google Scholar
  6. Miyake, Y. & Tsujimoto, K. 1996: Mechanism of Self-Sustenance and Regeneration of Quasi-streamwise Vortices of Near-Wall Turbulence. Trans. JSME, ser.B, 62-598 2172–2179.CrossRefGoogle Scholar
  7. Miyake, Y. & Tsujimoto, K. 1995: Direct Numerical Simulation of Turbulent Channel Flow with periodic Pressure Gradient. Trans. JSME, ser.B, 61-587, 2401–2408. (in Japanese)CrossRefGoogle Scholar
  8. Moin, P., Shih, T.-H. Driver, D. & Mansour, N.N. 1990: Direct numerical simulation of a three-dimensional turbulent boundary layer. Phys. Fluids, A2-10 1846–1853.CrossRefADSGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 1997

Authors and Affiliations

  • Y. Miyake
    • 1
  • K. Tsujimoto
    • 1
  • M. Takahashi
    • 2
  1. 1.Dept. of Mech. Eng.Osaka UniversitySuita, OsakaJapan
  2. 2.Toshiba Electronic Co.Tsurumi-ku, YokohamaJapan

Personalised recommendations