Refinement of pattern recognition of coherent structures in turbulent shear flows and a comparison between detection techniques

  • Robert S. Brodkey
  • Yousef G. Aouad
  • Hedayatollah Valizadeh-Alavi
  • Helmut Eckelmann
III. Instability and Turbulence
Part of the Lecture Notes in Physics book series (LNP, volume 235)


The present account summarizes changes recently incorporated into the pattern recognition (PR) program used by Wallace, Brodkey, and Eckelmann (1977). These changes were instituted so that detailed comparisons could be made between the PR technique and other detection schemes for coherent structures currently in vogue [e.g., VITA and quadrant splitting (QS)]. The X-film data obtained in the Göttingen oil channel were analyzed by the new program to extract additional information to provide a detailed comparison between techniques. The comparison is presented as a composite picture of the key elements of the sequence of events.


Pattern Recognition Coherent Structure Positive Slope Amplitude Criterion Turbulent Shear Flow 
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.


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Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • Robert S. Brodkey
    • 1
  • Yousef G. Aouad
    • 1
  • Hedayatollah Valizadeh-Alavi
    • 2
  • Helmut Eckelmann
    • 3
  1. 1.Department of Chemical EngineeringUSA
  2. 2.Department of Civil EngineeringThe Ohio State UniversityColumbusUSA
  3. 3.Max-Planck-Institut für StrömungsforschungGöttingenWest Germany

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