Hairpin vortex organization in wall turbulencea

Ronald Adrian

doi:10.1063/1.2717527

Hairpin vortex organization in wall turbulencea

Ronald Adrian

Mechanical and Aerospace Engineering

Research output: Contribution to journal › Article › peer-review

1023 Scopus citations

Abstract

Coherent structures in wall turbulence transport momentum and provide a means of producing turbulent kinetic energy. Above the viscous wall layer, the hairpin vortex paradigm of Theodorsen coupled with the quasistreamwise vortex paradigm have gained considerable support from multidimensional visualization using particle image velocimetry and direct numerical simulation experiments. Hairpins can autogenerate to form packets that populate a significant fraction of the boundary layer, even at very high Reynolds numbers. The dynamics of packet formation and the ramifications of organization of coherent structures (hairpins or packets) into larger-scale structures are discussed. Evidence for a large-scale mechanism in the outer layer suggests that further organization of packets may occur on scales equal to and larger than the boundary layer thickness.

Original language	English (US)
Article number	041301
Journal	Physics of Fluids
Volume	19
Issue number	4
DOIs	https://doi.org/10.1063/1.2717527
State	Published - Apr 2007

ASJC Scopus subject areas

Computational Mechanics
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Fluid Flow and Transfer Processes

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10.1063/1.2717527

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abstract = "Coherent structures in wall turbulence transport momentum and provide a means of producing turbulent kinetic energy. Above the viscous wall layer, the hairpin vortex paradigm of Theodorsen coupled with the quasistreamwise vortex paradigm have gained considerable support from multidimensional visualization using particle image velocimetry and direct numerical simulation experiments. Hairpins can autogenerate to form packets that populate a significant fraction of the boundary layer, even at very high Reynolds numbers. The dynamics of packet formation and the ramifications of organization of coherent structures (hairpins or packets) into larger-scale structures are discussed. Evidence for a large-scale mechanism in the outer layer suggests that further organization of packets may occur on scales equal to and larger than the boundary layer thickness.",

author = "Ronald Adrian",

note = "Funding Information: The assistance of J. Baltzer, K. Kim, and D. O{\textquoteright}Donnell in preparing this paper is gratefully acknowledged. Research was supported by the U. S. National Science Foundation, the Air Force Office of Scientific Research, the Office of Naval Research, and the Ira A. Fulton Endowment.",

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AU - Adrian, Ronald

N1 - Funding Information: The assistance of J. Baltzer, K. Kim, and D. O’Donnell in preparing this paper is gratefully acknowledged. Research was supported by the U. S. National Science Foundation, the Air Force Office of Scientific Research, the Office of Naval Research, and the Ira A. Fulton Endowment.

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N2 - Coherent structures in wall turbulence transport momentum and provide a means of producing turbulent kinetic energy. Above the viscous wall layer, the hairpin vortex paradigm of Theodorsen coupled with the quasistreamwise vortex paradigm have gained considerable support from multidimensional visualization using particle image velocimetry and direct numerical simulation experiments. Hairpins can autogenerate to form packets that populate a significant fraction of the boundary layer, even at very high Reynolds numbers. The dynamics of packet formation and the ramifications of organization of coherent structures (hairpins or packets) into larger-scale structures are discussed. Evidence for a large-scale mechanism in the outer layer suggests that further organization of packets may occur on scales equal to and larger than the boundary layer thickness.

AB - Coherent structures in wall turbulence transport momentum and provide a means of producing turbulent kinetic energy. Above the viscous wall layer, the hairpin vortex paradigm of Theodorsen coupled with the quasistreamwise vortex paradigm have gained considerable support from multidimensional visualization using particle image velocimetry and direct numerical simulation experiments. Hairpins can autogenerate to form packets that populate a significant fraction of the boundary layer, even at very high Reynolds numbers. The dynamics of packet formation and the ramifications of organization of coherent structures (hairpins or packets) into larger-scale structures are discussed. Evidence for a large-scale mechanism in the outer layer suggests that further organization of packets may occur on scales equal to and larger than the boundary layer thickness.

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Hairpin vortex organization in wall turbulencea

Abstract

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