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Numerical Calculation of Turbulent Channel Flow with Porous Ribs

Published online by Cambridge University Press:  05 May 2011

H. C. Chan ,
Yaoxin Zhang ,
J. M. Leu  and
Y.-S. Chen
H. C. Chan*
Affiliation:
Department of Hydraulic and Ocean Engineering, National Cheng Kung University, Tainan, Taiwan 70101, R.O.C.
Yaoxin Zhang*
Affiliation:
National Center for Computational Hydroscience and Engineering, The University of Mississippi, 102 Carrier Hall, University, MS 38677, United States
J. M. Leu*
Affiliation:
Department of Hydraulic and Ocean Engineering, National Cheng Kung University Tainan, Taiwan 70101, R.O.C.
Y.-S. Chen*
Affiliation:
Department of Hydraulic and Ocean Engineering, National Cheng Kung University Tainan, Taiwan 70101, R.O.C. Southern Region Water Resources Office, WRA, MOEA, Tainan County, Taiwan 71544, R.O.C.
*
*Post-Doctoral Researcher
**Research Scientist
***Associate Professor, corresponding author
****Ph.D. candidate and Junior Engineer
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Abstract

The turbulent flow in a channel with periodic porous ribs on one wall is numerically studied. The numerical model utilizes the Reynolds averaged Navier-Stokes (RANS) equations with a k−ε turbulent model for turbulence closure. Computational results show good agreements with experimental data in flows over a porous rib. The parameter effects, including the pitch ratio PR (1 ∼ 9) and porosity γ (0.4 ∼ 0.6), on flow fields are further examined in detail. Systematic variations of streamline, streamwise and vertical velocities, and turbulent kinetic energy are clearly identified. As to the PR effect, the interaction between outer flow and flow within the cavity is promoted by arranging ribs due to the penetration of the outer flow. Increasing porosity can reduce the downward outer flow by strong flows passing through the porous ribs. The numerical calculations suggest that the flow characteristics for porous ribs are not only a function of the rib geometry, i.e. pitch ratio, but also the porous property, i.e. porosity.

Keywords

RibPorous mediumTurbulent flowRANS modeling.
Type
Articles
Information
Journal of Mechanics , Volume 26 , Issue 1 , March 2010 , pp. 15 - 28
Copyright
Copyright © The Society of Theoretical and Applied Mechanics, R.O.C. 2010

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