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)


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.


Coherent Structure Reynolds Shear Stress Autocorrelation Coefficient Horseshoe Vortex Wall Distance 
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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

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