Advertisement

Some Streamwise Vorticity Characteristics of Coherent Structures

  • E. G. Kastrinakis
  • S. G. Nychas
  • H. Eckelmann
Conference paper
Part of the International Union of Theoretical and Applied Mechanics book series (IUTAM)

Summary

A new probe — which measures the streamwise vorticity component, ωx, and all three velocity components, Ū + u, v, w - was used to recognize and analyse coherent structures quantitatively in a fully-developed, turbulent, channel flow. A quadrant analysis was applied to classify events related to the four possible combinations of signs of u and v. To isolate the most energetic events a threshold was introduced in the instantaneous value of the Reynolds shear stress. It was found that the ejections provided the major contribution to ωx 2 regardless of the threshold and distance from the wall. Information on the scales of detected events is also given.

Keywords

Coherent Structure Reynolds Shear Stress Autocorrelation Coefficient Horseshoe Vortex Wall Distance 
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.
    Kline, S.J., Reynolds, W.C., Schraub, F.A. and Runstadler, P.W.,1967 J. Fluid Mech. 30, 741.CrossRefADSGoogle Scholar
  2. 2.
    Corino, E.R. and Brodkey, R.S.,1969 J. Fluid Mech. 37, 1.CrossRefADSGoogle Scholar
  3. 3.
    Kim, H.T., Kline, S.J. and Reynolds, W.C.,1971 J. Fluid Mech. 50, 133.CrossRefADSGoogle Scholar
  4. 4.
    Kovasznay, L.S.G.,1954 Physical measurements in gas dynamics and combustion, Princeton University Press, Princeton, p. 227.Google Scholar
  5. 5.
    Corrsin, S. and Kistler, A.L.,1955 NACA Rep. 1244.Google Scholar
  6. 6.
    Willmarth, W.W.,1976 Structure of turbulence boundary layers, Advances Applied Mechanics, Vol. 15 Academic Press.Google Scholar
  7. 7.
    Kastrinakis, E.G., Wallace, J.M., Willmarth, W.W., Ghorashi, B. and Brodkey, R.S.,1978 Lectures Notes in Physics 75, 175.CrossRefADSGoogle Scholar
  8. 8.
    Vakoslavcevic, P. and Wallace, J.M.,1981 Rev. Sei. Instrum. 52, 869.CrossRefADSGoogle Scholar
  9. 9.
    Kastrinakis, E.G. and Eckelmann, H. Measurements of streamwise vorticity fluctuations in a turbulent channel flow, submitted for publication to J. Fluid Mech.Google Scholar
  10. 10.
    Wallace, J.M., Eckelmann, H. and Brodkey, R.S.,1972 J. Fluid Mech. 54, 39.CrossRefADSGoogle Scholar
  11. 11.
    Lu, S.S. and Willmarth, W.W.,1973 J. Fluid Mech. 60, 3, 481.CrossRefADSGoogle Scholar
  12. 12.
    Sabot, J. and Comte-Bellot, G.,1976 J. Fluid Mech. 74, 767.CrossRefADSGoogle Scholar
  13. 13.
    Comte-Bel1ot, G., Sabot, J. and Saleh, I., 1978 Proc. Dyn. Flow Conference, Marseille-Baltimore, 213.Google Scholar
  14. 14.
    Nakagawa, H. and Nezu, I., 1981 J. Fluid Mech. 104, 1.CrossRefADSGoogle Scholar
  15. 15.
    Raupach, M.R., 1981 J. Fluid Mech. 108, 363.CrossRefzbMATHADSGoogle Scholar
  16. 16.
    Nychas, S.G., Hershey, H.C. and Brodkey, R.S., 1973 J. Fluid Mech. 61, 513.CrossRefADSGoogle Scholar
  17. 17.
    Bakewell, H.P. and Lumley, J.L., 1967 Phys. Fluids 10, 1880.CrossRefADSGoogle Scholar
  18. 18.
    Lee, M.K., Eckelman, L.D. and Hanratty, T.J., 1974 J. Fluid Mech. 66, 17.CrossRefADSGoogle Scholar
  19. 19.
    Blackwelder, R.F. and Eckelmann, H., 1979 J. Fluid Mech. 94, 577.CrossRefADSGoogle Scholar
  20. 20.
    Smith, C.R., Schwartz, S.D., Metzler, S.D. and Cerra, A.W.,1980 Proc. Int. Symp. on Flow Visualization, Bochum, Germany.Google Scholar
  21. 21.
    Praturi, A.K. and Brodkey, R.S.,1978 J. Fluid Mech. 89, 251.CrossRefADSGoogle Scholar

Copyright information

© Springer, Berlin Heidelberg New York 1983

Authors and Affiliations

  • E. G. Kastrinakis
    • 1
  • S. G. Nychas
    • 1
  • H. Eckelmann
    • 2
  1. 1.Department of Chemical EngineeringUniversity of ThessalonikiGreece
  2. 2.Max-Planck-Institut für StrömungsforschungGöttingenFederal Republic of Germany

Personalised recommendations