Advertisement

Drag Reduction on External Surfaces Induced by Wall Waves

  • H. C. de Lange
  • Luca Brandt
Conference paper
Part of the ERCOFTAC Series book series (ERCO, volume 15)

Abstract

Drag-reduction can be achieved by delaying of the onset of a turbulent flow as well as quenching turbulence itself. Due to the highly local nature of turbulent events and the rapid nature of breakdown a sensor-less (open-loop) strategy is highly preferable, since it prevents the necessity of large numbers of fast sensor/actuator combinations. Thus far, the success of the control strategies for boundary layer flows is limited and for bypass-transition none of the strategies has been successful. However, recent investigations indicate that sensorless (open-loop) control of transition to turbulence and drag reduction in turbulent flows is a feasible option.

Keywords

Control Region Drag Reduction Streamwise Velocity Boundary Layer Transition Streaky Structure 
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. 1.
    Min, T., Kang, S.M., Speyer, J.L. & Kim, J. (2006). Sustained sub-laminar drag in a fully developed channel flow. J. Fluid Mech. 558, 309–318. zbMATHCrossRefGoogle Scholar
  2. 2.
    Hoepffner, J., & Fukagata, K. (2009). Pumping or drag reduction? J. Fluid Mech. 635, 171–187. MathSciNetzbMATHCrossRefGoogle Scholar
  3. 3.
    Bewley, T.R. (2009). A fundamental limit on the balance of power in a transpiration- controlled channel flow J. Fluid Mech. 632, 442–446. MathSciNetCrossRefGoogle Scholar
  4. 4.
    Lee, C., Min, T. & Kim, J. (2008). Stability of channel flow subject to wall blowing and suction in the form of a traveling wave. Phys. Fluids 20, 101513. CrossRefGoogle Scholar
  5. 5.
    Du, Y. & Karniadakis, G.E. (2000). Suppressing wall turbulence by means of transverse traveling wave. Science, 288. Google Scholar
  6. 6.
    Quadrio, M., Ricco, P. & Viotti, C. (2009). Streamwise-traveling waves of spanwise wall velocity in a turbulent channel flow. J. Fluid Mech. 627, 161–178. MathSciNetzbMATHCrossRefGoogle Scholar
  7. 7.
    Schlatter, P., Brandt, L., Lange, H.C. de & Henningson, D.S. (2008). On streak breakdown in bypass transition. Phys. Fluids 20, 101505. CrossRefGoogle Scholar
  8. 8.
    Chevalier, M., Schlatter, P., Lundbladh, A. & Henningson, D.S. (2007). A Pseudo-Spectral Solver for Incompressible Boundary Layer Flows. Tech. Rep. TRITA-MEK 2007:07. Royal Institute of Technology (KTH), Dept. of Mechanics, Stockholm. Google Scholar
  9. 9.
    Schlatter, P., Stolz, S. & Kleiser, L. (2004). LES of transitional flows using the approximate deconvolution model. Int. J. Heat Fluid Flow, 25, 549–558. CrossRefGoogle Scholar
  10. 10.
    Taneda, S. (1977). Visual Study of unsteady separated flows around bodies, Progr. Aerosp. Sci. 17, 287–348. CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringEindhoven University of TechnologyEindhovenThe Netherlands

Personalised recommendations