The mechanism of streak formation in near-wall turbulence

By S. Chernyshenko, M. Baig. Journal of Fluid Mechanics, 2005

136 citations recorded by the source corpus.

Two conceptual frameworks for the origin of the streaky pattern in near-wall developed turbulent flows are compared. According to the framework that dominated the research over several decades, the pattern of streaks is dictated by the pattern of wall-normal motions via the lift-up mechanism. Various concepts within this framework describe the wall-normal motions as induced by longitudinal vortices, hairpin vortices, vortex packets, etc. According to the newly emerging conceptual framework, the combined action of lift-up of the mean profile, mean shear, and viscous diffusion has its own pattern-forming properties. The pattern of streaks is dictated by these linear effects to a much greater extent than by the pattern of the wall-normal motions. Numerical results supporting the new conceptual framework are presented. An approximate approach for calculating the streak spacing within the new framework is proposed. It is shown to have a significant predictive ability.

Subfields: Aerospace Engineering, Computational Mechanics, Environmental Engineering

View Paper: https://www.semanticscholar.org/paper/51cd38b732430319ece4c8c546af4caa760abd5b

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Citations in the corpus

Characterization of coherent vortical structures in a supersonic turbulent boundary layer (2008, methodology): “By using the DNS database of Spalart (1988), Chong et al. (1998) have characterized the topological properties of wall-bounded flows, and have confirmed the occurrence of Theodorsen’s hairpin-like vortices, as well as the existence of vortex tubes nearly aligned with the streamwise direction. Accord”
Near-wall streak modification by spanwise oscillatory wall motion and drag-reduction mechanisms (2012, background): “The role played by (i) in the generation cycle of near-wall streak is described for example in Chernyshenko & Baig (2005).”
The engine behind (wall) turbulence: perspectives on scale interactions (2017, background): “817 P1-23 From consideration of (3.27), it can be seen that a large response uk to a general forcing f k can be obtained through either a large singular value, σk,j, or a large forcing weight, χ k,j, a conceptual distinction that was discussed by Chernyshenko & Baig (2005).”
Conditions for validity of mean flow stability analysis (2016, unknown): “Non-modal analysis with turbulent mean flows has been introduced by Butler & Farrell (1993), Chernyshenko & Baig (2005), Del Álamo & Jimenez (2006), Cossu, Pujals & Depardon (2009), Pujals et al. (2009) and Moarref & Jovanović (2012).”