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Direct numerical simulation of turbulent flow through a ribbed square duct

Published online by Cambridge University Press:  06 August 2020

S. V. Mahmoodi-Jezeh Open the ORCID record for S. V. Mahmoodi-Jezeh [Opens in a new window]  and
Bing-Chen Wang Open the ORCID record for Bing-Chen Wang [Opens in a new window]
S. V. Mahmoodi-Jezeh
Affiliation:
Department of Mechanical Engineering, University of Manitoba, Winnipeg, MBR3T 5V6, Canada
Bing-Chen Wang*
Affiliation:
Department of Mechanical Engineering, University of Manitoba, Winnipeg, MBR3T 5V6, Canada
*
†Email address for correspondence: bingchen.wang@umanitoba.ca
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Abstract

In this research turbulent flow in a ribbed square duct of different blockage ratios ($Br=0.05$, 0.1 and 0.2) at a fixed Reynolds number of $Re_b=5600$ is studied using direct numerical simulation. The results are compared with those of a smooth duct flow. In contrast to the classical two-dimensional rib-roughened boundary-layer flow over a flat plate, the turbulence field is influenced by not only the rib elements but also the four duct sidewalls. The results detail out the three-dimensional effects of the sidewalls and ribs on flow statistics and structures. This study also aims at investigating the effect of blockage ratio on local non-equilibrium of turbulence, large- and small-scale flow anisotropy, and transport of turbulence kinetic energy. It is observed that as the rib height increases, the pressure near the windward face of the rib increases significantly, associated with an accelerated streamwise flow in the duct. Furthermore, an augmentation of the blockage ratio concurrently generates stronger turbulent secondary flow motions, resulting in larger magnitudes of Reynolds stresses near the rib crest. The secondary flow motions drastically alter the turbulent transport processes between the sidewall and duct centre, giving rise to high degrees of non-equilibrium states. The dynamics of coherent structures are studied by examining characteristics of the instantaneous velocity field, swirling strength, temporal auto-correlations, spatial two-point auto-correlations and velocity spectra. The results show that an increase of rib height significantly promotes the ejection and sweep events, which subsequently amplify the strength of vortical motions near the rib crest.

JFM classification

Turbulent Flows: Turbulence simulation Turbulent Flows: Shear layer turbulence Turbulent Flows: Turbulent convection
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 900 , 10 October 2020 , A18
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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