Role of coherent structures in turbulent shear flows

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Abstract

A definition for the large-scale coherent structure is presented, and the nature and role of coherent structures in turbulent shear flows are examined. The equations governing the coherent motions and the experimental considerations as well as constraints in the investigations of coherent structures in wall-bounded and free turbulent shear flows are discussed. Results from a few of our recent and ongoing studies of coherent structures in excited and unexcited free turbulent shear flows are reviewed. These results show that coherent structures are dominant in transport in the early stages of their formation, but not in the self-preserving regions of turbulent shear flows.

Original languageEnglish
Pages (from-to)129-175
Number of pages47
JournalProceedings of the Indian Academy of Sciences Section C: Engineering Sciences
Volume4
Issue number2
DOIs
StatePublished - Aug 1981

Keywords

  • Coherent structures
  • Taylor hypothesis
  • axisymmetric jets
  • conditional sampling
  • eduction of large-scale structures
  • effects of initial condition
  • importance of coherent structures
  • large scale organised motions
  • mixing layers
  • phase average
  • turbulent shear flows
  • unsteady turbulent flows
  • vortex pairing

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