How vegetation in flows modifies the turbulent mixing and spreading of jets

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...

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Autores principales:	Michele Mossa, Mouldi Ben Meftah, Francesca De Serio, Heidi M. Nepf
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/991de519a49647309dc7731ba5dcb2c3
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spelling	oai:doaj.org-article:991de519a49647309dc7731ba5dcb2c32021-12-02T12:32:39ZHow vegetation in flows modifies the turbulent mixing and spreading of jets10.1038/s41598-017-05881-12045-2322https://doaj.org/article/991de519a49647309dc7731ba5dcb2c32017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-05881-1https://doaj.org/toc/2045-2322Abstract 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.Michele MossaMouldi Ben MeftahFrancesca De SerioHeidi M. NepfNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-14 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Michele Mossa Mouldi Ben Meftah Francesca De Serio Heidi M. Nepf How vegetation in flows modifies the turbulent mixing and spreading of jets
description	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.
format	article
author	Michele Mossa Mouldi Ben Meftah Francesca De Serio Heidi M. Nepf
author_facet	Michele Mossa Mouldi Ben Meftah Francesca De Serio Heidi M. Nepf
author_sort	Michele Mossa
title	How vegetation in flows modifies the turbulent mixing and spreading of jets
title_short	How vegetation in flows modifies the turbulent mixing and spreading of jets
title_full	How vegetation in flows modifies the turbulent mixing and spreading of jets
title_fullStr	How vegetation in flows modifies the turbulent mixing and spreading of jets
title_full_unstemmed	How vegetation in flows modifies the turbulent mixing and spreading of jets
title_sort	how vegetation in flows modifies the turbulent mixing and spreading of jets
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/991de519a49647309dc7731ba5dcb2c3
work_keys_str_mv	AT michelemossa howvegetationinflowsmodifiestheturbulentmixingandspreadingofjets AT mouldibenmeftah howvegetationinflowsmodifiestheturbulentmixingandspreadingofjets AT francescadeserio howvegetationinflowsmodifiestheturbulentmixingandspreadingofjets AT heidimnepf howvegetationinflowsmodifiestheturbulentmixingandspreadingofjets
_version_	1718393994294067200

How vegetation in flows modifies the turbulent mixing and spreading of jets

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