The influence of urban arrays on air quality

Name: Fabiana Trindade da Silva
Type: PhD thesis
Publication date: 21/02/2020

Namesort descending Role
Neyval Costa Reis Jr. Advisor *

Examining board:

Namesort descending Role
Cristina Engel de Alvarez Co advisor *
Elisa Valentim Goulart Internal Examiner *
Jane Meri Santos Internal Examiner *
Luis Manuel Bragança de Miranda e Lopes External Examiner *
Miguel Jose das Neves Pires Amado External Examiner *
Neyval Costa Reis Jr. Advisor *

Summary: Urban morphology is a fundamental aspect of understanding the pollutant dispersion in
the urban environment. In addition, block typology is a key element in modeling scenarios
closer to reality. The urban planning usually defines urban indexes to conduct city growth.
Thus, the study’s main goal is to analyze, using CFD, the impact that different urban
planning strategies have on the pollutant dispersion at the pedestrian level. For this, the
planning strategies investigated are block typology and the urban indexes (FAR, SC, and
H). To assess the interference of different urban configurations in air quality, six
typologies using URANS (Unsteady Reynolds Average Navier Stokes) were simulated.
The typologies are single-block, detached buildings, central courtyard, inners courtyards,
longitudinal row and transversal row. From the six case simulation results, were selected
three typologies for indexes variation: single-block, detached buildings and central
courtyard, that present different porosity disposition. It was found for the basic cases that
the single block typology had the lowest concentration and the detached buildings had
the higher. However, with a decrease of the surface coverage (SC), this same typology
had one of the smallest concentration between configurations. In addition, for the same
FAR (5), reduce the SC and, consequently, increase the building's height, resulting in less
concentration than an arrangement with shorter buildings. Finally, the performance of
local ventilation is not linearly related to SC but strongly depends on the arrangement of
the buildings (block typology).

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