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Author Lauriks, T.; Longo, R.; Baetens, D.; Derudi, M.; Parente, A.; Bellemans, A.; van Beeck, J.; Denys, S.
Title Application of improved CFD modeling for prediction and mitigation of traffic-related air pollution hotspots in a realistic urban street Type A1 Journal article
Year (down) 2021 Publication Atmospheric Environment Abbreviated Journal Atmos Environ
Volume 246 Issue Pages 118127
Keywords A1 Journal article; Engineering sciences. Technology; Sustainable Energy, Air and Water Technology (DuEL)
Abstract The correct prediction of air pollutants dispersed in urban areas is of paramount importance to safety, public health and a sustainable environment. Vehicular traffic is one of the main sources of nitrogen oxides (NO ) and particulate matter (PM), strongly related to human morbidity and mortality. In this study, the pollutant level and distribution in a section of one of the main road arteries of Antwerp (Belgium, Europe) are analyzed. The assessment is performed through computational fluid dynamics (CFD), acknowledged as a powerful tool to predict and study dispersion phenomena in complex atmospheric environments. The two main traffic lanes are modeled as emitting sources and the surrounding area is explicitly depicted. A Reynolds-averaged Navier–Stokes (RANS) approach specific for Atmospheric Boundary Layer (ABL) simulations is employed. After a validation on a wind tunnel urban canyon test case, the dispersion within the canopy of two relevant urban pollutants, nitrogen dioxide (NO) and particulate matter with an aerodynamic diameter smaller than 10 m (PM10), is studied. An experimental field campaign led to the availability of wind velocity and direction data, as well as PM10 concentrations in some key locations within the urban canyon. To accurately predict the concentration field, a relevant dispersion parameter, the turbulent Schmidt number, , is prescribed as a locally variable quantity. The pollutant distributions in the area of interest – exhibiting strong heterogeneity – are finally demonstrated, considering one of the most frequent and concerning wind directions. Possible local remedial measures are conceptualized, investigated and implemented and their outcomes are directly compared. A major goal is, by realistically reproducing the district of interest, to identify the locations inside this intricate urban canyon where the pollutants are stagnating and to analyze which solution acts as best mitigation measure. It is demonstrated that removal by electrostatic precipitation (ESP), an active measure, and by enhancing the dilution process through wind catchers, a passive measure, are effective for local pollutant removal in a realistic urban canyon. It is also demonstrated that the applied ABL methodology resolves some well known problems in ABL dispersion modeling.
Address
Corporate Author Thesis
Publisher Place of Publication Editor
Language Wos 000613550100003 Publication Date 2020-12-07
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 1352-2310 ISBN Additional Links UA library record; WoS full record; WoS citing articles
Impact Factor 3.629 Times cited Open Access OpenAccess
Notes Approved Most recent IF: 3.629
Call Number UA @ admin @ c:irua:173917 Serial 7477
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Author Longo, R.; Ferrarotti, M.; Garcia Sánchez, C.; Derudi, M.; Parente, A.
Title Advanced turbulence models and boundary conditions for flows around different configurations of ground-mounted buildings Type A1 Journal article
Year (down) 2017 Publication Journal of wind engineering and industrial aerodynamics Abbreviated Journal J Wind Eng Ind Aerod
Volume 167 Issue Pages 160-182
Keywords A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract When dealing with Atmospheric Boundary Layer (ABL) simulations, commercial computational fluid dynamics (CFD) acquires a strategic resonance. Thanks to its good compromise between accuracy of results and calculation time, RANS still represents a valid alternative to more resource-demanding methods. However, focusing on the models' performances in urban studies, LES generally outmatches RANS results, even if the former is at least one order of magnitude more expensive. Consequently, the present work aims to propose a variety of approaches meant to solve some of the major problems linked to RANS simulations and to further improve its accuracy in typical urban contexts. All of these models are capable of switching from an undisturbed flux formulation to a disturbed one through a local deviation or a marker function. For undisturbed flows, a comprehensive approach is adopted, solving the issue of the erroneous stream-wise gradients affecting the turbulent profiles. Around obstacles, Non-Linear Eddy-Viscosity closures are adopted, due to their prominent capability in capturing the anisotropy of turbulence. The purpose of this work is then to propose a new Building Influence Area concept and to offer more affordable alternatives to LES simulations without sacrificing a good grade of accuracy.
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Corporate Author Thesis
Publisher Place of Publication Amsterdam Editor
Language Wos 000405766600013 Publication Date 2017-05-02
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0167-6105 ISBN Additional Links UA library record; WoS full record; WoS citing articles
Impact Factor 2.049 Times cited 9 Open Access Not_Open_Access
Notes ; ; Approved Most recent IF: 2.049
Call Number UA @ lucian @ c:irua:145191 Serial 4713
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Author Peerenboom, K.; Parente, A.; Kozák, T.; Bogaerts, A.; Degrez, G.
Title Dimension reduction of non-equilibrium plasma kinetic models using principal component analysis Type A1 Journal article
Year (down) 2015 Publication Plasma sources science and technology Abbreviated Journal Plasma Sources Sci T
Volume 24 Issue 24 Pages 025004
Keywords A1 Journal article; Plasma Lab for Applications in Sustainability and Medicine – Antwerp (PLASMANT)
Abstract The chemical complexity of non-equilibrium plasmas poses a challenge for plasma modeling because of the computational load. This paper presents a dimension reduction method for such chemically complex plasmas based on principal component analysis (PCA). PCA is used to identify a low-dimensional manifold in chemical state space that is described by a small number of parameters: the principal components. Reduction is obtained since continuity equations only need to be solved for these principal components and not for all the species. Application of the presented method to a CO2 plasma model including state-to-state vibrational kinetics of CO2 and CO demonstrates the potential of the PCA method for dimension reduction. A manifold described by only two principal components is able to predict the CO2 to CO conversion at varying ionization degrees very accurately.
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Corporate Author Thesis
Publisher Institute of Physics Place of Publication Bristol Editor
Language Wos 000356816200008 Publication Date 2015-01-27
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0963-0252;1361-6595; ISBN Additional Links UA library record; WoS full record; WoS citing articles
Impact Factor 3.302 Times cited 11 Open Access
Notes Approved Most recent IF: 3.302; 2015 IF: 3.591
Call Number c:irua:123534 Serial 704
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Author Parente, A.; Gorlé, C.; van Beeck, J.; Benocci, C.
Title A comprehensive modelling approach for the neutral atmospheric boundary layer : consistent inflow conditions, wall function and turbulence model Type A1 Journal article
Year (down) 2011 Publication Boundary-layer meteorology Abbreviated Journal Bound-Lay Meteorol
Volume 140 Issue 3 Pages 411-428
Keywords A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract We report on a novel approach for the Reynolds-averaged Navier-Stokes (RANS) modelling of the neutral atmospheric boundary layer (ABL), using the standard k− turbulence model. A new inlet condition for turbulent kinetic energy is analytically derived from the solution of the k− model transport equations, resulting in a consistent set of fully developed inlet conditions for the neutral ABL. A modification of the standard k− model is also employed to ensure consistency between the inlet conditions and the turbulence model. In particular, the turbulence model constant C μ is generalized as a location-dependent parameter, and a source term is introduced in the transport equation for the turbulent dissipation rate. The application of the proposed methodology to cases involving obstacles in the flow is made possible through the implementation of an algorithm, which automatically switches the turbulence model formulation when going from the region where the ABL is undisturbed to the region directly affected by the building. Finally, the model is completed with a slightly modified version of the Richards and Hoxey rough-wall boundary condition. The methodology is implemented and tested in the commercial code Ansys Fluent 12.1. Results are presented for a neutral boundary layer over flat terrain and for the flow around a single building immersed in an ABL.
Address
Corporate Author Thesis
Publisher Place of Publication Dordrecht Editor
Language Wos 000293923800004 Publication Date 2011-05-25
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0006-8314;1573-1472; ISBN Additional Links UA library record; WoS full record; WoS citing articles
Impact Factor 2.573 Times cited 54 Open Access
Notes Approved Most recent IF: 2.573; 2011 IF: 1.737
Call Number UA @ lucian @ c:irua:92341 Serial 450
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