Experimental measurement of large-scale three-dimensional structures in a turbulent boundary layer. Part 2. Long structures

By David J. C. Dennis, T. Nickels. Journal of Fluid Mechanics, 2011

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Towards Reconciling the Large-Scale Structure of Turbulent Boundary Layers in the Atmosphere and Laboratory (2012, background): “The inclination angle of 25◦ away from the wall is small compared to the original findings of Head and Bandyopadhyay (1981), who reported 45◦, but in very good agreement with the 26.5◦ found by Dennis and Nickels (2011a).”
The three-dimensional structure of momentum transfer in turbulent channels (2011, background): “It is interesting to mention at this point that recent visualization work suggests that the very-long structures mentioned above may be an exclusive feature of internal flows, and are not present in turbulent boundary layers (Hutchins et al. 2011; Dennis & Nickels 2011b; Lee & Sung 2011).”
On coherent structure in wall turbulence (2013, methodology): “The meandering effect described by Monty et al. (2007) has been explained in various ways (Dennis & Nickels 2011a; Hellström et al. 2011; Sharma & McKeon 2011) to arise from a decorrelation of the energetically dominant VLSMs due to motions at other scales.”
The engine behind (wall) turbulence: perspectives on scale interactions (2017, methodology): “The choices of |χkA | and |χkC | were also determined by reference to experimental observations, namely the separation of hairpin vortices in the PIV results of Dennis & Nickels (2011a), with the amplitudes satisfying a visual agreement with the spectrum at those wavenumbers.”