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Scalar Fluxes Near a Tall Building in an Aligned Array of Rectangular Buildings

Scalar dispersion from ground-level sources in arrays of buildings is investigated using wind-tunnel measurements and large-eddy simulation (LES). An array of uniform-height buildings of equal dimensions and an array with an additional single tall building (wind tunnel) or a periodically repeated ta...

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Autores principales: Fuka, Vladimír, Xie, Zheng-Tong, Castro, Ian P., Hayden, Paul, Carpentieri, Matteo, Robins, Alan G.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Netherlands 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6566286/
https://www.ncbi.nlm.nih.gov/pubmed/31258156
http://dx.doi.org/10.1007/s10546-017-0308-4
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author Fuka, Vladimír
Xie, Zheng-Tong
Castro, Ian P.
Hayden, Paul
Carpentieri, Matteo
Robins, Alan G.
author_facet Fuka, Vladimír
Xie, Zheng-Tong
Castro, Ian P.
Hayden, Paul
Carpentieri, Matteo
Robins, Alan G.
author_sort Fuka, Vladimír
collection PubMed
description Scalar dispersion from ground-level sources in arrays of buildings is investigated using wind-tunnel measurements and large-eddy simulation (LES). An array of uniform-height buildings of equal dimensions and an array with an additional single tall building (wind tunnel) or a periodically repeated tall building (LES) are considered. The buildings in the array are aligned and form long streets. The sensitivity of the dispersion pattern to small changes in wind direction is demonstrated. Vertical scalar fluxes are decomposed into the advective and turbulent parts and the influences of wind direction and of the presence of the tall building on the scalar flux components are evaluated. In the uniform-height array turbulent scalar fluxes are dominant, whereas the tall building produces an increase of the magnitude of advective scalar fluxes that yields the largest component. The presence of the tall building causes either an increase or a decrease to the total vertical scalar flux depending on the position of the source with respect to the tall building. The results of the simulations can be used to develop parametrizations for street-canyon dispersion models and enhance their capabilities in areas with tall buildings.
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spelling pubmed-65662862019-06-28 Scalar Fluxes Near a Tall Building in an Aligned Array of Rectangular Buildings Fuka, Vladimír Xie, Zheng-Tong Castro, Ian P. Hayden, Paul Carpentieri, Matteo Robins, Alan G. Boundary Layer Meteorol Research Article Scalar dispersion from ground-level sources in arrays of buildings is investigated using wind-tunnel measurements and large-eddy simulation (LES). An array of uniform-height buildings of equal dimensions and an array with an additional single tall building (wind tunnel) or a periodically repeated tall building (LES) are considered. The buildings in the array are aligned and form long streets. The sensitivity of the dispersion pattern to small changes in wind direction is demonstrated. Vertical scalar fluxes are decomposed into the advective and turbulent parts and the influences of wind direction and of the presence of the tall building on the scalar flux components are evaluated. In the uniform-height array turbulent scalar fluxes are dominant, whereas the tall building produces an increase of the magnitude of advective scalar fluxes that yields the largest component. The presence of the tall building causes either an increase or a decrease to the total vertical scalar flux depending on the position of the source with respect to the tall building. The results of the simulations can be used to develop parametrizations for street-canyon dispersion models and enhance their capabilities in areas with tall buildings. Springer Netherlands 2017-11-04 2018 /pmc/articles/PMC6566286/ /pubmed/31258156 http://dx.doi.org/10.1007/s10546-017-0308-4 Text en © The Author(s) 2017 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
spellingShingle Research Article
Fuka, Vladimír
Xie, Zheng-Tong
Castro, Ian P.
Hayden, Paul
Carpentieri, Matteo
Robins, Alan G.
Scalar Fluxes Near a Tall Building in an Aligned Array of Rectangular Buildings
title Scalar Fluxes Near a Tall Building in an Aligned Array of Rectangular Buildings
title_full Scalar Fluxes Near a Tall Building in an Aligned Array of Rectangular Buildings
title_fullStr Scalar Fluxes Near a Tall Building in an Aligned Array of Rectangular Buildings
title_full_unstemmed Scalar Fluxes Near a Tall Building in an Aligned Array of Rectangular Buildings
title_short Scalar Fluxes Near a Tall Building in an Aligned Array of Rectangular Buildings
title_sort scalar fluxes near a tall building in an aligned array of rectangular buildings
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6566286/
https://www.ncbi.nlm.nih.gov/pubmed/31258156
http://dx.doi.org/10.1007/s10546-017-0308-4
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