IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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| Turbulence statistics and structures by large-eddy simulation of open-channel sub-critical flow over bed dune |
| Author : |
Athanassios Dimas, E. Balaras, D. Grigoriadis |
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The open-channel, sub-critical flow over fixed dune is numerically simulated and the developing turbulent coherent structures are analyzed. The study is based on a large-eddy simulation utilizing the immersed boundary method to incorporate the dune geometry. Results are presented for a typical dune shape and two Reynolds numbers Re=17500 and Re=93500. A primary flow circulation region develops downstream of the dune crest at both Reynolds numbers, while a secondary circulation region develops in the toe of the dune crest only for the low Reynolds number. Downstream of the primary circulation region, hairpin-like vortices develop, which, as they are convected along the upslope part of the next dune, they get stretched and weaken.
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| File Size : |
1,552,660 bytes |
| File Type : |
Adobe Acrobat Document |
| Chapter : |
IAHR World Congress Proceedings
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| Category : |
32nd Congress - Venice (2007)
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| Article : |
THEME A: Engineering and Management of Fresh-water Systems
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| Date Published : |
01/07/2007 |
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