Experimental support for Townsend’s Reynolds number similarity hypothesis on rough walls

By K. Flack, M. Schultz, Thomas A. Shapiro. 2005

321 citations recorded by the source corpus.

Subfields: Computational Mechanics, Ecology, Global and Planetary Change

View Paper: https://www.semanticscholar.org/paper/801183f08f01263bae57957855c6bac5390b9a70

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In Ecology

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Citations in the corpus

Direct numerical simulation of the turbulent boundary layer over a rod-roughened wall (2007, background): “Flack et al. (2005) and Schultz & Flack (2005) suggested that effective sand grain roughness height (ks) is a better representative length scale than roughness height (k) for comparing the roughness effects of different roughness geometrical characteristics.”
Observations of turbulent secondary flows in a rough-wall boundary layer (2014, unknown): “A necessary condition for this similarity to exist is a broad-scale separation between k and δ, with previous works indicating δ/k> 40–50 for this similarity to exist (Flack et al. 2005).”
Turbulence Structure in Rough and Smooth Wall Boundary Layers (2006, methodology): “Details of both methods are given in Flack et al. (2005). The uncertainties in the boundary-layer thickness (based here on U/Ue = 0.”
Spatial structure of a turbulent boundary layer with irregular surface roughness (2010, methodology): “However, most of these efforts had weak scale separation between the roughness and the outer length scale of the flow, yielding δ/k and/or δ/ks values well below the thresholds proposed by Jimenez (2004) and Flack et al. (2005).”
Roughness effects in turbulent pipe flow (2006, methodology): “The work of Flack et al. (2005) shows a universal collapse in the outer layer, even though their largest nondimensional roughness height was significantly larger than that used by Krogstad & Antonia (1999). Jiménez (2004) makes the point that experiments with both a large k and a small = k/D (or k/δ”
Effect of wall-boundary disturbances on turbulent channel flows (2006, methodology): “Since some of those changes are typically encountered in turbulent flows over rough walls, we have interpreted the present boundary condition as a method for simulating the effect of the roughness without having to deal with the details of the flow around the roughness elements, as previously sugges”
Interactions within the turbulent boundary layer at high Reynolds number (2011, background): “Regarding the current dataset, our estimate of k s = 50 implies that results within at least three equivalent sandgrain roughness heights, z < 3k s = 150, must be interpreted with roughness effects in mind (see Flack et al. 2005). A transitionally rough wall can be considered to introduce a contamin”
Turbulence structure in a boundary layer with two-dimensional roughness (2009, methodology): “Details of both methods are given in Flack et al. (2005).”
The rough-wall turbulent boundary layer from the hydraulically smooth to the fully rough regime (2006, methodology): “This is in agreement with previous work (Flack et al. 2005) which showed similar results for both sandpaper and woven mesh roughness.”