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  • 1
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    Role of coherent structures in turbulent shear flows (1981)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: 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 on-going 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.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: vol. 4; Aug. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Passive and active control of jet turbulence (1988)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Techniques for controlling the generation, growth, and interactions of large coherent structures in turbulent flows are discussed, reviewing the results of recent experimental investigations. The fundamental principles of active and passive coherent-structure manipulation are outlined; the effects of geometric modification are examined for the case of an elliptic jet; and particular attention is given to passive control via self-excitation, turbulence and noise suppression, control of pairing interaction via two-frequency excitation, and unsteady boundary-layer separation in wall jets. Diagrams and graphs of typical results are provided.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: IUTAM Symposium on Turbulence Management and Relaminarisation; Jan 13, 1987 - Jan 23, 1987; Bangalore; India
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Coherent structures in a turbulent boundary layer. I - Generation of 'artificial' bursts (1986)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: In an effort to better understand the physics and structure of coherent events in a turbulent boundary layer, an attempt is made to produce 'artificial' bursts. These are generated in a turbulent boundary layer developed on a flat plate towed in an 18 m water channel and thus with negligible freestream turbulence. The burstlike events are produced by either withdrawing near-wall fluid from two minute holes separated in the spanwise direction or by pitching a miniature delta wing that is flush-mounted to the wall. Either of these two actions generates a hairpinlike vortex and low-speed streak that resemble naturally occurring structures. The resulting sequence of events that occur at a given location can be uniquely controlled, thus allowing detailed examination via phase-locked measurements and flow visualization. In this paper, the proof of concept of artificial burst generation is established by comparing the artificial events with natural, random bursts using flow visualization and hot-film signals.
    Keywords: FLUID MECHANICS AND HEAT TRANSFER
    Type: Physics of Fluids (ISSN 0031-9171); 29; 2124-213
    Format: text
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