SUBMERGED VANES TURBULENCE EXPERIMENTAL ANALYSIS
- Format
- DoctoralThesis
- Status
- publishedVersion
- Description
Submerged vanes are low aspect ratio flow-training structures mounted vertically on the channel bed to control the sediment movement in the channel cross section, and have been utilized in various applications, such as prevention of bank erosion, sediment exclusion at water intakes, and deepening channels for navigation. The performance of a submerged vane is related to its dimensions and shape. The vanes designed to modify the near-bed flow pattern and redistribute flow and sediment transport within the channel cross-section. The structures are installed at an angle of attack of typically 10 to 20 degrees with the flow, and their initial height is 0.2 to 0.4 times the local water depth at design stage.The vanes function by generating secondary circulation in the flow. The circulation alters magnitude and direction of the bed shear stresses and causes a change in the distribution of velocity, depth, and sediment transport in the area affected by the vanes. As a result, the riverbed aggrades in one portion of the channel cross-section and degrades in another. Most of the previous laboratory research on submerged vanes has been performed at the University of Iowa, Iowa Institute of Hydraulic Research (IIHR). Investigations by Odgaard and colleagues led to the development of design guidelines for vane systems. Results of recent studies, however, indicate that the theoretical relations by Odgaard et al. are subjected to complete and accurate some characterizations of the hydrodynamic behavior of the vane; most of them are to predict the experimental lift and drag forces exerted on vanes, the theory calculated that forces and pressures theoretically. Furthermore, the experimental vertical pressures acting on both sides of submerged vanes are still undefined, though of outmost importance to vane design. In our investigation we achieved to measure that vertical pressures acting on both sides of submerged vane, calculate lift and drag forces, lift and drag coefficients experimentally. Present study investigatesexperimentally the hydrodynamic characterization of submerged vanesas; velocities fields, circulation, vorticity, bed topography, pressures, drag and lift forces with its coefficients. Second part, study physical fluid turbulence of submerged vanes as;Reynolds normal and shear stresses, turbulent kinetic energy and rate of dissipation, turbulence intensities, Kolmogorov scales, kinetic energy spectrum, turbulent velocities fields, fluctuating velocities and finally Reynolds stresses histograms. All our dissertation based on experimental study through a huge laboratory data using a cross section of a straight alluvial recirculating rectangular channelat the Morphodynamics Laboratory (designed by Prof. Allen Bateman) of the Department of Hydraulic, Maritime and Environmental Engineering, School of Civil Engineering and Ports of Barcelona at the Barcelona Tech. University ? UPC ? Spain.
- Publication Year
- 2015
- Language
- eng
- Topic
- HIDROMEC?NICA FLUVIAL
INGENIER?A HIDR?ULICA
TRANSPORTE DE SEDIMENTOS
F?SICA
SUBMERGED VANES
TURBULENCE
- Repository
- Repositorio SENESCYT
- Rights
- openAccess
- License