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Article: The NOx-O3 photochemical reactive air pollutant dispersion around an isolated building—the role of turbulence model and building aspect ratio

TitleThe NOx-O3 photochemical reactive air pollutant dispersion around an isolated building—the role of turbulence model and building aspect ratio
Authors
KeywordsLarge eddy simulation (LES)
Near-field
NOx- O3 recirculation
Pollutant dispersion
Reynolds-averaged Navier–Stokes (RANS)
Issue Date6-Oct-2023
PublisherElsevier
Citation
Building and Environment, 2023, v. 245 How to Cite?
Abstract

The NOx-O3 photochemical reactive air pollutant dispersion around an isolated building bears significant scientific and engineering implications. The present work extends the investigation to the role of turbulence models and building aspect ratio, providing valuable insights for future numerical investigations and building complex design. Validated against wind tunnel experiments, a serial Computational Fluid Dynamics (CFD) investigation was conducted with physiochemical coupling, including one large eddy simulation with near-wall resolution (LES-NWR) and three Reynolds-averaged Navier-Stokes (RANS) viscosity models (i.e., standard k-ε model (STK), renormalization group k-ε model (RNG), realizable k-ε model (RLZ)). The numerical models were assessed regarding the predictive capability of the mean pollutant concentration and velocity fields. Results show that the areas of high NO concentration are generally indifferent to the selection of turbulence models. Elsewhere, the RLZ provides the most comparable results to the LES-NWR, whereas the RNG and STK underestimate the reverse flow in the building wake and produce subpar predictions at the roof. The RNG also yields the weakest prediction by overestimating the lateral separation bubbles’ influence. Furthermore, changing the aspect ratio has negligible effects on the stream and spanwise dispersion of the highly concentrated pollutant. However, the building width plays a more decisive role in constraining the streamwise dispersion than the building height. Doubling the building length also slows down the shrinkage of recirculation, leading to a steep deduction in the streamwise dispersion along the building height.


Persistent Identifierhttp://hdl.handle.net/10722/339915
ISSN
2023 Impact Factor: 7.1
2023 SCImago Journal Rankings: 1.647
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorFu, Yunfei-
dc.contributor.authorLin, Xisheng-
dc.contributor.authorLi, Lu-
dc.contributor.authorChu, Mengyuan-
dc.contributor.authorLiu, Chun-Ho-
dc.contributor.authorChen, Zengshun-
dc.contributor.authorLi, Cruz Y-
dc.contributor.authorTse, K T-
dc.date.accessioned2024-03-11T10:40:17Z-
dc.date.available2024-03-11T10:40:17Z-
dc.date.issued2023-10-06-
dc.identifier.citationBuilding and Environment, 2023, v. 245-
dc.identifier.issn0360-1323-
dc.identifier.urihttp://hdl.handle.net/10722/339915-
dc.description.abstract<p>The NO<sub>x</sub>-O<sub>3</sub> photochemical reactive air pollutant dispersion around an isolated building bears significant scientific and engineering implications. The present work extends the investigation to the role of turbulence models and building aspect ratio, providing valuable insights for future numerical investigations and building complex design. Validated against wind tunnel experiments, a serial Computational Fluid Dynamics (CFD) investigation was conducted with physiochemical coupling, including one large eddy simulation with near-wall resolution (LES-NWR) and three Reynolds-averaged Navier-Stokes (RANS) viscosity models (i.e., standard k-ε model (STK), renormalization group k-ε model (RNG), realizable k-ε model (RLZ)). The numerical models were assessed regarding the predictive capability of the mean pollutant concentration and velocity fields. Results show that the areas of high NO concentration are generally indifferent to the selection of turbulence models. Elsewhere, the RLZ provides the most comparable results to the LES-NWR, whereas the RNG and STK underestimate the reverse flow in the building wake and produce subpar predictions at the roof. The RNG also yields the weakest prediction by overestimating the lateral separation bubbles’ influence. Furthermore, changing the aspect ratio has negligible effects on the stream and spanwise dispersion of the highly concentrated pollutant. However, the building width plays a more decisive role in constraining the streamwise dispersion than the building height. Doubling the building length also slows down the shrinkage of recirculation, leading to a steep deduction in the streamwise dispersion along the building height.<br></p>-
dc.languageeng-
dc.publisherElsevier-
dc.relation.ispartofBuilding and Environment-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectLarge eddy simulation (LES)-
dc.subjectNear-field-
dc.subjectNOx- O3 recirculation-
dc.subjectPollutant dispersion-
dc.subjectReynolds-averaged Navier–Stokes (RANS)-
dc.titleThe NOx-O3 photochemical reactive air pollutant dispersion around an isolated building—the role of turbulence model and building aspect ratio-
dc.typeArticle-
dc.identifier.doi10.1016/j.buildenv.2023.110906-
dc.identifier.scopuseid_2-s2.0-85173853759-
dc.identifier.volume245-
dc.identifier.eissn1873-684X-
dc.identifier.isiWOS:001094585700001-
dc.identifier.issnl0360-1323-

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