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CFD dispersion study based on a variable Schmidt formulation for flows around different configurations of ground-mounted buildings

Longo, Riccardo ; Fürst, Magnus ; Bellemans, Aurélie ; Ferrarotti, Marco ; Derudi, Marco ; Parente, Alessandro

Building and environment, 2019-05, Vol.154, p.336-347 [Peer Reviewed Journal]

Oxford: Elsevier Ltd

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Title:
CFD dispersion study based on a variable Schmidt formulation for flows around different configurations of ground-mounted buildings
Author: Longo, Riccardo ; Fürst, Magnus ; Bellemans, Aurélie ; Ferrarotti, Marco ; Derudi, Marco ; Parente, Alessandro
Subjects: Aerodynamics ; Air pollution ; Atmospheric boundary layer ; Boundary layers ; Computational fluid dynamics ; Computer applications ; Configurations ; Design of experiment ; Dispersion ; Emission analysis ; Environmental impact ; Fluid dynamics ; Fluid flow ; Ground level ; Hydrodynamics ; Industrial engineering ; Industrial plant emissions ; Industrial plants ; Industrial pollution ; Literature reviews ; Manufacturing engineering ; Pollutant dispersion ; Pollutants ; Pollution dispersion ; Pollution sources ; RANS ; Schmidt number ; Simulation ; Turbulence ; Turbulent Schmidt number ; Uncertainty quantification ; Urban areas ; Urban environment
Is Part Of: Building and environment, 2019-05, Vol.154, p.336-347
Description: Computational fluid dynamics (CFD) has become a reference tool for the investigation of pollutant emission and dispersion in urban areas, and for the assessment of the associated risk. In this framework, specific focus is given to the estimation of the downwind and ground level concentration of air pollutants coming from emission sources such as vehicular traffic, industrial plants or accidental events. Pollutant dispersion in the Atmospheric Boundary Layer (ABL) is strongly impacted by the turbulence. This leads to a complex coupled problem, considering the reciprocal influence of the two phenomena. A key role in pollutant dispersion is played by the turbulent Schmidt number Sct which directly affects the turbulent dispersion coefficient and, consequently, the concentration field. No universally-accepted formulation for the turbulent Schmidt number exists in the literature, although its impact on the prediction of pollutant dispersion is recognised. Stemming from a brief review of the existing literature and knowledge on the topic, this paper aims to propose a novel approach for the optimal determination of Sct, also through the use of uncertainty quantification. The proposed Sct is based on the local turbulece level, and is validated on different idealized test cases, representative of typical urban configurations. •The key role played by a variable turbulent Schmidt number is demonstrated.•A novel Sct formulation depending on relevant turbulence variables is proposed.•The main parameters of Sct are determined through uncertainty quantification.•The formulation is tested on three idealized urban configurations.•The downwind underprediction of concentration is reduced.
Publisher: Oxford: Elsevier Ltd
Language: English

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CFD dispersion study based on a variable Schmidt formulation for flows around different configurations of ground-mounted buildings

Longo, Riccardo ; Fürst, Magnus ; Bellemans, Aurélie ; Ferrarotti, Marco ; Derudi, Marco ; Parente, Alessandro

Oxford: Elsevier Ltd

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