Entrainment and mixing of unsteady gravity currents in compound channels

Elnaz Vahed (), Milad Khosravi () and Mitra Javan
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Elnaz Vahed: Department of Civil Engineering, Razi University, Kermanshah 6714414971, Iran
Milad Khosravi: Department of Civil Engineering, Razi University, Kermanshah 6714414971, Iran
Mitra Javan: Department of Civil Engineering, Razi University, Kermanshah 6714414971, Iran

International Journal of Modern Physics C (IJMPC), 2024, vol. 35, issue 10, 1-27

Abstract: Compound channels are a common hydraulic section of many alluvial and fluvial systems, serving as conduits for the flow of water and sediment. The proper design of these structures requires an understanding of the entrainment and mixing mechanisms in them. This paper presents a three-dimensional numerical study of lock-exchange flow in a compound channel covering the Reynolds numbers (Re) range of 17000–39000. This study investigates flow structures and mixing patterns for various geometries and flow characteristics. The results show that the entrainment coefficient decreases as the dense flow progresses, and the amplitude of instantaneous mixing fluctuations decreases with an increase in the width of the floodplain and reduced gravity. The averaged flux entrainment profiles show a minimum at Re=27000 at different times in the front area. In the head area also, a downward concavity can be seen in the profiles around Re=27000. This study also reveals that changes in floodplain height do not affect the establishment of lobe-and-cleft instability. The wider the floodplain channel, the larger the lobe-and-cleft instability created. Small-scale mixing dominates at high Reynolds numbers, leading to higher fluid mixing.

Keywords: Compound channel; gravity currents; entrainment; mixing; numerical simulation (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1142/S0129183124501298

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