Microscale Obstacle Resolving Air Quality Model Evaluation with the Michelstadt CaseReport as inadecuate

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The Scientific World JournalVolume 2013 2013, Article ID 781748, 11 pages

Research ArticleDepartment of Fluid Mechanics, Budapest University of Technology and Economics, Budapest 1111, Hungary

Received 30 April 2013; Accepted 27 June 2013

Academic Editors: J. Corte-Real, M. A. Galán, and J. Koch

Copyright © 2013 Anikó Rakai and Gergely Kristóf. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Modelling pollutant dispersion in cities is challenging for air quality models as the urban obstacles have an important effect on the flow field and thus the dispersion. Computational Fluid Dynamics CFD models with an additional scalar dispersion transport equation are a possible way to resolve the flowfield in the urban canopy and model dispersion taking into consideration the effect of the buildings explicitly. These models need detailed evaluation with the method of verification and validation to gain confidence in their reliability and use them as a regulatory purpose tool in complex urban geometries. This paper shows the performance of an open source general purpose CFD code, OpenFOAM for a complex urban geometry, Michelstadt, which has both flow field and dispersion measurement data. Continuous release dispersion results are discussed to show the strengths and weaknesses of the modelling approach, focusing on the value of the turbulent Schmidt number, which was found to give best statistical metric results with a value of 0.7.

Author: Anikó Rakai and Gergely Kristóf

Source: https://www.hindawi.com/


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