DNS OF VELOCITY AND THERMAL FIELDS IN TURBULENT CHANNEL FLOW WITH TRANSVERSE-RIB ROUGHNESS

By Y. Nagano, H. Hattori, T. Houra. Proceeding of Third Symposium on Turbulence and Shear Flow Phenomena, 2004

133 citations recorded by the source corpus.

A detailed knowledge of both velocity and thermal fields in wall turbulence disturbed by a row of ribs on the wall is important for clarifying the chief factors of fluid and thermal dynamics related to the control of heat transfer. In this study, in order to elucidate the effects of roughness on the statistical quantities in the velocity and thermal fields, direct numerical simulations (DNS) of heat transfer in turbulent channel flows with transverse-rib roughness have been performed by varying their spacing, width and height, in which the turbulent heat transfer with k-type and d-type roughness walls are simulated. It is found that since turbulent mixing is promoted by arranging ribs, the distributions of mean velocity and temperature become markedly asymmetric. Systematic variations of secondary flow patterns between ribs are clearly identified. The best heat transfer performance is found to be obtained with the k-type roughness.

Subfields: Computational Mechanics, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/d0ad888571d8175472392811bc61cb612f973f19

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In Computational Mechanics

In Mechanical Engineering

Citations in the corpus

Direct simulations of a rough-wall channel flow (2007, methodology): “These disrupted vortical structures near rib-roughened wall were also reproduced numerically by Leonardi et al. (2003a) and Nagano et al. (2004), and agree well with their observations.”
An experimental and numerical study of channel flow with rough walls (2005, background): “Leonardi et al. (2003) considered square-bar roughness with a wide range of pitch-to-height ratios, whereas Nagano et al. (2004) also studied rectangular rods 2 and 4 times wider than their height k. Ikeda & Durbin (2002) performed DNS of a configuration with uneven rod height.”