How vegetation in flows modifies the turbulent mixing and spreading of jets
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s41598-017-05881-1.pdf
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Author(s)
Mossa, Michele
Ben Meftah, Mouldi
De Serio, Francesca
Nepf, Heidi
Date Issued
July 2017
Journal
Scientific Reports
Publisher
Nature Publishing Group
Citation
Mossa, Michele et al. “How Vegetation in Flows Modifies the Turbulent Mixing and Spreading of Jets.” Scientific Reports 7, 1 (July 2017): 6587 © 2017 The Author(s)
Version
Final published version
Abstract
While studies on vegetated channel flows have been developed in many research centers, studies on jets interacting with vegetation are still rare. This study presents and analyzes turbulent jets issued into an obstructed cross-flow, with emergent vegetation simulated with a regular array of cylinders. The paper presents estimates of the turbulence diffusion coefficients and the main turbulence variables of jets issued into a vegetated channel flow. The experimental results are compared with jets issued into unobstructed cross-flow. In the presence of the cylinder array, the turbulence length-scales in the streamwise and transverse directions were reduced, relative to the unobstructed crossflow. This contributed to a reduction in streamwise turbulent diffusion, relative to the unobstructed conditions. In contrast, the transverse turbulent diffusion was enhanced, despite the reduction in length-scale, due to enhanced turbulent intensity and the transverse deflection of flow around individual cylinders. Importantly, in the obstructed condition, the streamwise and transverse turbulent diffusion coefficients are of the same order of magnitude.
MIT Department
Massachusetts Institute of Technology. Department of Civil and Environmental Engineering
Terms of Use
Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1038/S41598-017-05881-1
