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.
Log On
About IAHRDirectoryCommitteesMy IAHRNews & JournalseLibraryeShopEventsJoin IAHRWorld CongressDonate
spacer.gif
spacer.gif eLibrary
spacer.gif eLibrary
You are here : eLibrary : IAHR World Congress Proceedings : 32nd Congress - Venice (2007) : THEME A: Engineering and Management of Fresh-water Systems : Influence of bend orientation on the hydrodynamics of meandering channels: experimental and numerica...
Influence of bend orientation on the hydrodynamics of meandering channels: experimental and numerical work
Author : Jorge D. Abad , Javier Ancalle, Gustavo C. Buscaglia and Marcelo H. Garcia
Meandering rivers exhibit complex planform patterns. The main objective of this study is to observe the influence of bend orientation on the hydrodynamics and morphodynamics of high-amplitude meandering channels. In this paper, only hydrodynamics results are presented by experimental and numerical approaches. In the experimental part, mean and turbulent flow structures have been investigated for the case of periodic assymetric meandering channel. The channel planform con figuration of the designed flume retains high-order harmonic modes, thus, cases where meander bends are oriented upstream- and downstream-valley can be studied. In order to describe the e ffects of bend orientation on the channel hydrodynamics, a flat smooth bed (no sediment) condition has been considered to purely describe the eff ects of bend orientation on the hydrodynamics of the meandering channel. In the numerical part, an in-house Finite Element (FE) model is applied to solve the hydrodynamics of the Kinoshita meandering channel. The hydrodynamic model solves the 3D Reynolds Averaged Navier-Stokes (RANS) equation and the k - e equations for turbulence. The model uses a Eulerian Level Set Method to capture the free surface (gas-liquid interface). The model is validated comparing our measurements against numerical results, thus, the model can
be used to simulate hydraulic conditions where measurements could not be taken due
to shallowness of the flow, due to proximity of walls, and due to operational experimental conditions. Both experimental and numerical results show that at the bend apex, the core of maximum velocity is found near the inner bank (for both bend orientations). Also, at the bend apex, the results show that when bends are oriented upstream-valley, the secondary flow is not as developed as in the case where bends are oriented downstream-valley.
File Size : 2,719,879 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
Download Now