Hairpin vortex organization in wall turbulencea)

By Ronald J. Adrian. 2007

1,377 citations recorded by the source corpus.

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.

Subfields: Computational Mechanics, Environmental Engineering, Global and Planetary Change

View Paper: https://www.semanticscholar.org/paper/9ffd0611f36144f2445c112b6277f88737a48e5b

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Citations in the corpus

High–Reynolds Number Wall Turbulence (2011, background): “Spectral analysis of VLSM and LSM indicates that they make a significant contribution to the turbulent kinetic energy and Reynolds stress production (Guala et al. 2006, Balakumar & Adrian 2007), which distinguishes them from the inactive motions proposed by Townsend (1976).”
Direct-simulation-based study of turbulent flow over various waving boundaries (2010, background): “This is the opposite of the typical horseshoe vortices near a flat wall, of which the heads are downstream of the legs (see e.g. Adrian 2007).”
Large-eddy simulation and wall modelling of turbulent channel flow (2009, methodology): “…quasi-streamwise vortical structures in wall turbulence have long been observed by researchers (see e.g. Head & Bandyopadhyay 1981; Robinson 1991) and have also served as useful physical models (see e.g. Townsend 1976; Perry & Chong 1982; Marušić & Perry 1995; Adrian 2007; Nickels et al. 2007).”
On coherent structure in wall turbulence (2013, background): “This is the opposite interpretation to the vortex induction arguments given by Adrian (2007), the apparent disparity arising because of the assumption of the mean velocity profile as opposed to the attempt to determine the mean velocity profile in the latter case.”
Spatial resolution correction for wall-bounded turbulence measurements (2011, background): “Furthermore, there is strong evidence to suggest that the near-wall streaks are a manifestation, or at least are associated with, the legs of near-wall attached eddies as described by Perry & Chong (1982) and Adrian (2007), where the size of the smallest attached eddies is O(100ν/uτ ).”
A predictive inner–outer model for streamwise turbulence statistics in wall-bounded flows (2011, background): “This addresses a comment by Adrian (2010), in the related Science perspectives article, for the need of future work to evaluate the model ‘for flow geometries different from the flat plate’.”
The engine behind (wall) turbulence: perspectives on scale interactions (2017, background): “…is dependent on the weight χ1, with increasing amplitude leading to a ramp/cliff structure followed by an isosurface that bends back on itself and is no longer single-valued at constant y, both structures with direct equivalents 817 P1-50 in observations (e.g. Adrian 2007, figures 6, 10 and 11).”
On the Nature of the Transition Between Roll and Cellular Organization in the Convective Boundary Layer (2017, background): “…the surface layer, i.e. the near-neutral surface layer is dominated by hairpin vortex packets (e.g. Head and Bandyopadhyay 1981; Robinson 1991; Adrian 2007), which transport momentum and scalars similarly, but the highly convective surface layer is dominated by buoyant thermals, which…”
Coherent Structures and the Dissimilarity of Turbulent Transport of Momentum and Scalars in the Unstable Atmospheric Surface Layer (2011, background): “It is now generally recognized that hairpin vortices (first proposed by Theodorsen 1952) and the streamwise packets they form are the primary coherent structures forming in the logarithmic layer of the neutral turbulent boundary layer under laboratory conditions (Adrian 2007).”
Colour of turbulence (2016, background): “The existence of coherent structures in turbulent wall-bounded shear flows (Robinson 1991; Adrian 2007; Smits, McKeon & Marusic 2011) has inspired the development of data-driven techniques for reduced-order modeling of the NS equations.”
Coherent structures in wall-bounded turbulence (2017, background): “Note that the streaks are different from the ‘hairpin packets’ often proposed as building blocks for the logarithmic layer (Adrian 2007).”
Physics and Computation of Aero-Optics (2012, background): “It is well-established that turbulent boundary layers contain packets of vortical structures with a preferred angular direction (e.g., Adrian 2007, Wu & Moin 2009).”
Direct numerical simulation of horizontal open channel flow with finite-size, heavy particles at low solid volume fraction (2013, background): “…that the positive x-direction points into the paper. to dominate the buffer region in boundary-layer-type flows and are responsible for most of the turbulence activity therein (Robinson, 1991; Jiménez and Pinelli, 1999; Adrian, Meinhart, and Tomkins, 2000; Schoppa and Hussain, 2000; Adrian, 2007).”
Direct numerical simulation of complete H-type and K-type transitions with implications for the dynamics of turbulent boundary layers (2013, background): “…farther downstream and the instantaneous flow structure consists of hairpin packets as observed by Wu & Moin (2009) and studied by Marusic (2001), Adrian (2007) and others (Perry & Chong 1982; Perry & Marusic 1995; Zhou et al. 1999; Adrian, Meinhart & Tomkins 2000; Ganapathisubramani, Longmire &…”
Turbulent boundary layers around wing sections up to Rec=1,000,000 (2018, background): “Whereas the very low Rec = 100, 000 case exhibits predominance of hairpin-like structures (Theodorsen, 1952; Adrian, 2007; Schlatter et al., 2014) over a large portion of the chord length, these become progressively less common as Re increases, being essentially absent at Rec = 1, 000, 000, except…”