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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 5 - FLUVIAL HYDRAULICS AND RIVER MANAGEMENT : LES of Lock-Exchange Gravity Currents Propagating into a Fully-Vegetated Channel
LES of Lock-Exchange Gravity Currents Propagating into a Fully-Vegetated Channel
Author : A.Yuksel Ozan and George Constantinescu
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.
File Size : 201,688 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Date Published : 18/07/2016
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