STRUCTURE OF TURBULENT CHANNEL FLOW WITH SQUARE BARS ON ONE WALL

By Stefano Leonardi, Paolo Orlandi, L. Djenidi, R. Antonia. Proceeding of Third Symposium on Turbulence and Shear Flow Phenomena, 2004

163 citations recorded by the source corpus.

The organised motion in a turbulent channel flow with a succession of square bars on the bottom wall has been investigated using direct numerical simulations. Several values of the ratio w/k, where k is the bar height and w is the longitudinal separation between consecutive bars have been examined in detail. Relative to a smooth surface, the streamwise extent of the near-wall structures is decreased while their spanwise extent is increased. As w/k increases, the coherence decreases in the streamwise direction having a minimum for w/k=7. This is due to the outward motion occurring, most of all, near the leading edge of the elements. The Reynolds stress anisotropy tensor and its invariants show a closer approach to isotropy over the rough wall than over a smooth wall.

Subfields: Computational Mechanics, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/4303ba3c9b2f2680b340f776706bbe8bb69b22ad

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In Computational Mechanics

In Mechanical Engineering

Citations in the corpus

Structure of turbulent flow over regular arrays of cubical roughness (2007, background): “Similar results were also reported recently by Leonardi et al. (2004) in a DNS study on near-wall structures over square bars.”
Effect of Roughness on Wall-Bounded Turbulence (2004, methodology): “[11] also reported that roughness results in the tendency to isotropy.”
An experimental and numerical study of channel flow with rough walls (2005, methodology): “The DNS of Leonardi et al. (2004) indicates a substantial increase in the plane-averaged w+2 above the plane of the ribs.”
DNS of turbulent channel flows with two- and three-dimensional roughness (2006, background): “[31] through two-point correlations and anisotropy invariant maps.”
Direct numerical simulation of the turbulent boundary layer over a cube-roughened wall (2010, background): “For turbulent channel flow with transverse rod roughness with px/k varying from 2 to 8, Leonardi et al. (2004) showed that whereas the instantaneous isocontour of the wall-normal vorticity fluctuations with px/k = 2 moves downstream, parallel to the plane of the crests for px/k = 8, the contour is…”
Direct simulations of a rough-wall channel flow (2007, methodology): “This was also confirmed both experimentally and numerically (e.g. Krogstad & Antonia 1994; Leonardi et al. 2003a) through the examination of two-point correlations for k-type roughness.”