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- Title
Effect of Building Orientations on Gaseous Dispersion in Street Canyon: a Numerical Study.
- Authors
Yassin, Mohamed; Kassem, Mohamed
- Abstract
This paper studies the effects of building orientations on the gaseous pollutant dispersion released from vehicles exhaust in street canyons through computational fluid dynamics (CFD) numerical simulations using three k- ε turbulence models. Four building orientations of the street canyon were examined in the atmospheric boundary layer. The numerical results were validated against wind-tunnel results to optimize the turbulence models. The numerical results agreed well with the wind-tunnel results. The simulation demonstrated that the minimum concentration at the human respiration height in the street canyon was on the windward side for the building orientations θ = 112.5°, 135°, and 157.5°. The pollutant concentration level decreases as the building orientation increases from θ = 90°. The concentration in the cavity region for the building orientation θ = 90° was higher than for the wind directions θ = 112.5°, 135°, and 157.5°. The wind velocity and turbulence energy increase as the building orientation increases. The finding from this work can be used to help urban designers and policy-makers in several aspects.
- Subjects
SUSTAINABLE architecture; POLLUTANTS; DIESEL automobile exhaust systems; COMPUTATIONAL fluid dynamics; COMPUTER simulation of turbulence; ATMOSPHERIC boundary layer
- Publication
Environmental Modeling & Assessment, 2014, Vol 19, Issue 4, p335
- ISSN
1420-2026
- Publication type
Article
- DOI
10.1007/s10666-013-9389-8