Conference proceeding
Effect of the solid volume fraction on the flow past a circular patch of vegetation with a low submergence depth
RIVER FLOW 2016, pp.2219-2225
2016
Abstract
In this paper, we investigate the effect of the Solid Volume Fraction (SVF) on the flow structure within and past a circular array of surface-mounted cylinders that extends over 75% of the water depth, h. This set up mimics the case of a submerged patch of rigid vegetation in a channel. The diameter of the cylinders in the array is d = 0.03D, where D is the diameter of the circular array. The channel Reynolds number is close to 20,000 and the Reynolds number defined with D is around 36,000. Detached Eddy Simulation (DES) is conducted for SVF = 9% and 23%. It is found that as the SVF increases from 9% to 23% a fairly strong necklace vortex system forms around the upstream face of the patch, the strength of the separated shear layers on the sides of the patch increases, the length of the recirculation region behind the patch decreases and the region of small bed friction velocities at the back of the patch diminishes. While an increase of the SVF results in a large increase of the turbulent kinetic energy in the wake, the opposite is observed within the porous patch. These effects should result in important differences in the patterns of sediment entrainment and deposition in the case of a vegetation patch placed on a loose bed channel.
Details
- Title: Subtitle
- Effect of the solid volume fraction on the flow past a circular patch of vegetation with a low submergence depth
- Creators
- W Y ChangG ConstantinescuW F Tsai
- Contributors
- D Hanes (Editor)
- Resource Type
- Conference proceeding
- Publication Details
- RIVER FLOW 2016, pp.2219-2225
- Language
- English
- Date published
- 2016
- Academic Unit
- Civil and Environmental Engineering
- Record Identifier
- 9984231918602771
Metrics
5 Record Views