Turbulence structure in a boundary layer with two-dimensional roughness

By R. Volino, M. Schultz, K. Flack. Journal of Fluid Mechanics, 2009

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Spatial structure of a turbulent boundary layer with irregular surface roughness (2010, methodology): “This surface condition was referred to as the ‘RF1’ surface condition in Wu & Christensen (2007) and yields a ratio of the boundary-layer thickness to the characteristic roughness height of δ/k = 27.”
Direct numerical simulation of the turbulent boundary layer over a cube-roughened wall (2010, methodology): “Volino et al. (2009) compared their results for flows over a 2-”
Estimation and prediction of the roughness function on realistic surfaces (2014, background): “In the rough-wall cases, the peaks of the normal stresses move slightly away from the wall due to the displacement effect of the roughness on the mean flow; the peak magnitude of 〈u′2〉+ is significantly damped, a phenomenon widely observed in experiments [28] and simulations [13,27].”