ORIGINAL RESEARCH
A Study of Downwash Effects on Flow
and Dispersion Processes around Buildings
in Tandem Arrangement
Renata Gnatowska
Institute of Thermal Machinery, Czestochowa University of Technology
Armii Krajowej 21, 42-201 Czestochowa, Poland
Armii Krajowej 21, 42-201 Czestochowa, Poland
Submission date: 2015-02-10
Final revision date: 2015-03-22
Acceptance date: 2015-03-22
Publication date: 2015-07-27
Pol. J. Environ. Stud. 2015;24(4):1571–1577
KEYWORDS
TOPICS
ABSTRACT
Air pollution is one of the world's most important problems. Our paper presents and discusses the relationship
between a structure of a flow field among neighboring buildings immersed in a boundary layer, and
characteristics of pollutant dispersion in that area. The flow and dispersion of gases emitted by a point source
located in front of the buildings also were determined by numerical model with the use of a commercial CFD
code (Ansys FLUENT). This paper presents the results of a complex research program aimed at understanding
the character of the flow field around groups of buildings in urban areas and the unsteady phenomena
resulting from the character of the wind or from the interference of the wake flow connected with the vortexshedding
process. The results showed that it is the factor-affecting process of the dispersion of pollutants in
the built-up area that is more complex than the propagation of small parts explained on the basis of the processes
of advection and turbulent diffusion.
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