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You are here : eLibrary : IAHR World Congress Proceedings : 32nd Congress - Venice (2007) : THEME A: Engineering and Management of Fresh-water Systems : Turbulence statistics and structures by large-eddy simulation of open-channel sub-critical flow over...
Turbulence statistics and structures by large-eddy simulation of open-channel sub-critical flow over bed dune
Author : Athanassios Dimas, E. Balaras, D. Grigoriadis
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.
File Size : 1,552,660 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 32nd Congress - Venice (2007)
Article : THEME A: Engineering and Management of Fresh-water Systems
Date Published : 01/07/2007
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