TITLE

LES를 이용한 침수식생을 통과하는 난류흐름 수치모의

AUTHOR(S)
김형석
PUB. DATE
September 2015
SOURCE
Journal of the Korea Academia-Industrial Cooperation Society;2015, Vol. 16 Issue 9, p6305
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
This study presents numerical simulations of mean flow and turbulence structure of an open channel with submerged vegetation. Filtered Navier-Stokes equations are solved using large-eddy simulation (LES). The immersed boundary method (IBM) is employed based on a Cartesian grid. The numerical result is compared with experimental data of Liu et al. (2008) and shows that simulated results coincided reasonably with experimental data within the average error of 10%. Strong vortices are generated at the interface between vegetated and non-vegetated regions with spanwise extent. The generation of turbulence induced by shear at the interface is interfered with wake turbulence, resulting turbulence intensity maximum. Turbulence produced by shear affects the flow in vegetated region and the penetration depth increases with an increase in the submergence ratio. This result can be used to understand sediment transport mechanisms in the vegetated region.
ACCESSION #
111154983

 

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