Conference proceeding
LES of Lock-Exchange Gravity Currents Propagating into a Fully-Vegetated Channel
PROCEEDINGS OF THE 35TH IAHR WORLD CONGRESS, VOLS I AND II, pp.6162-6167
2013
Abstract
Gravity currents in natural environments often propagate through regions containing flow obstructions. Large Eddy Simulation (LES) is used to investigate the evolution of high Reynolds number lock-exchange gravity currents with a high volume of release propagating in a channel of uniform porosity. The porous environment corresponds to a vegetated canopy. The porous region contains arrays of uniformly-distributed small rigid cylinders of constant diameter, D. The focus is on the case of a porous channel with a solid volume fraction of 12% and a Reynolds number defined with the channel depth H and the buoyancy velocity of 15,000. LES is used to analyze the temporal variation of the front velocity during the drag-dominated regime. The results are compared to those obtained based on shallow water theory. The effect of the relative size of the cylinders, D/H, on the flow structure and mixing is then analyzed. Results show that mixing increases monotonically with D/H. The increased in the mixing with D/H is related to the differences in the eddy content within the body of the gravity current among the different cases.
Details
- Title: Subtitle
- LES of Lock-Exchange Gravity Currents Propagating into a Fully-Vegetated Channel
- Creators
- A Y OzanG Constantinescu
- Contributors
- C Shuyou (Editor)
- Resource Type
- Conference proceeding
- Publication Details
- PROCEEDINGS OF THE 35TH IAHR WORLD CONGRESS, VOLS I AND II, pp.6162-6167
- Language
- English
- Date published
- 2013
- Academic Unit
- Civil and Environmental Engineering
- Record Identifier
- 9984231918302771
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