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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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : Numerical study of flow and turbulence through submerged vegetation
Numerical study of flow and turbulence through submerged vegetation
In this paper, we perform LES (large eddy simulation) for open channel flows through submerged matrix cylinders which
are regarded as rigid vegetation. The computational model solves the filtered Navier-stokes equations on a Cartesian grid
with local refinement and employs the ghost-cell immersed boundary method to deal with solid boundary. The cylinders
are explicitly treated by computational grids. The model is validated through comparison with experimental data of the
streamwise velocity profile. The effects of submergence ratio (water depth to vegetation height) on flow and turbulence
structure are investigated. The coherent structures are produced above and behind the cylinders and those intensities
amplified with decreasing submergence ratio. The large scale vortices, which are a main mechanism of momentum
exchange between the vegetation layer and the out of vegetation, are generated above the vegetation and these
penetration depths decrease with an increases in the submergence ratio. It is demonstrated that LES can capture large
scale vortices originating at the top of vegetation and account for detailed instantaneous flow field through submerged
File Size : 861,733 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 13/08/2015
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