Spatial structure of a turbulent boundary layer with irregular surface roughness

By Yanhua Wu, Kenneth T. Christensen. Journal of Fluid Mechanics, 2010

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Observations of turbulent secondary flows in a rough-wall boundary layer (2014, methodology): “Previous studies provide a more detailed description of this facility and its flow quality (Wu & Christensen 2007; Mejia-Alvarez & Christensen 2010; Wu & Christensen 2010; Mejia-Alvarez & Christensen 2013).”
Estimation and prediction of the roughness function on realistic surfaces (2014, background): “This size is sufficient to accommodate the largest turbulent structures on a smooth-wall channel flow; on 3D regular roughness or realistic gas-turbine surfaces, roughness has been found not to affect the size of large-scale structures in the outer layer [8,28].”
Direct numerical simulation of the turbulent boundary layer over a cube-roughened wall (2010, background): “…et al. (2000), who proposed a conceptual model of the hairpin packets in TBLs over smooth walls, and such structures are common features in the outer regions of TBLs over rough walls (Wu & Christensen 2010), although the vortex packet structures are significantly disturbed by the surface roughness.”