scholarly journals Wind-field and pollution-dispersion simulation in a street canyon in Helsinki with ADREA-HF code

2013 ◽  
Vol 8 (3) ◽  
pp. 272-276
Keyword(s):  
Complex Terrain ◽  
Street Canyon ◽  
Eddy Viscosity ◽  
Local Scale ◽  
Navier Stokes ◽  
Urban Street Canyon ◽  
Pollution Dispersion ◽  
Urban Street ◽  
Eddy Viscosity Model ◽  
Computational Fluid Dynamics Cfd

ADREA-HF, which is a Computational Fluid Dynamics (CFD) code, is utilised in order to numerically study the flow and concentration fields within a street-canyon area. The selected site is Runeberg Str., a typical urban street canyon with an aspect ratio of approximately 1:1 in Helsinki, Finland. The ADREA-HF model is a transient, non-hydrostatic, dense transport code, especially developed for dispersion modelling of buoyant or passive gases over complex terrain in local scale. It solves the 3D unsteady Reynolds Averaged Navier-Stokes (RANS) equations treating complex multi-building domains with a porosity formulation. For modelling turbulence a one-equation eddy-viscosity model is used. The numerical results illustrate the flow and concentration fields within the canyon and also show the influence of the detailed geometry, such as, that of the street junction situated at the northern end of the canyon, and that of the boulevard at the southern end.

Modelling of Flow and Pollution Dispersion in a Two Dimensional Urban Street Canyon

2002 ◽  
pp. 405-417
Author(s):  
D. Vlachogiannis ◽  
S. Rafailidis ◽  
J. G. Bartzis ◽  
S. Andronopoulos ◽  
A. G. Venetsanos
Keyword(s):  
Street Canyon ◽  
Two Dimensional ◽  
Urban Street Canyon ◽  
Pollution Dispersion ◽  
Urban Street

A Numerical Study on Airflow and Particle Dispersion within an Urban Street Canyon with Different Wedge-Shaped Roofs

2013 ◽  
Vol 869-870 ◽  
pp. 213-217
Author(s):  
Yakup Parida ◽  
Wen Rong He ◽  
Zhong Hua Zhou ◽  
Deng Feng Fu
Keyword(s):  
Street Canyon ◽  
Stokes Equations ◽  
Numerical Study ◽  
Distribution Patterns ◽  
Particle Dispersion ◽  
Atmospheric Environment ◽  
Navier Stokes ◽  
Urban Street Canyon ◽  
Urban Street ◽  
Pollution Levels

This work presents a numerical study on airflow and particle dispersion within an urban street canyon with different wedge-shaped roof. A two-dimensional computational fluid dynamics (CFD) model for evaluating the airflow and particles dispersion within a street canyon was built up, which was based on the incompressible Reynolds Averaged Navier-Stokes equations, turbulence model and the particles transportation equation. It is revealed that: (1) particles dispersion inside an urban street canyon is mostly dominated by the in-canyon wind flow; (2) different wedge-shaped roof configurations causes a variety of particles distribution patterns; (3) air pollution levels are much higher in the step-down canyons relative to the step-up canyons; (4) the simulated result of FLUENT is reasonable, and the prospect of applying FLUENT to study atmospheric environment is very well. Key words: CFD; street canyon; particle dispersion; numerical simulation

scholarly journals Technical note: Dispersion of cooking-generated aerosols from an urban street canyon

2021 ◽  
Author(s):  
Shang Gao ◽  
Mona Kurppa ◽  
Chak K. Chan ◽  
Keith Ngan
Keyword(s):  
Street Canyon ◽  
Relative Difference ◽  
Technical Note ◽  
Deep Frying ◽  
Strongly Correlated ◽  
Urban Street Canyon ◽  
Urban Street ◽  
Computational Fluid Dynamics Cfd ◽  
The Mean ◽  
Aerosol Module

Abstract. The dispersion of cooking-generated aerosols from an urban street canyon is examined with building-resolving computational fluid dynamics (CFD). Using a comprehensive urban CFD model (PALM) with a sectional aerosol module (SALSA), emissions from deep frying and boiling are considered for near-ground and elevated sources. It is found that, with representative choices of the source flux, the inclusion of aerosol dynamic processes decreases the mean canyon-averaged number concentration by 15–40 % for cooking emissions, whereas the effect is significantly weaker for traffic-generated aerosols. The effects of deposition and coagulation are comparable for boiling, but coagulation dominates for deep frying. Deposition is maximised inside the leeward corner vortices, while coagulation increases away from the source. The characteristic timescales are invoked to explain the spatial structure of deposition and coagulation. In particular, the relative difference between number concentrations for simulations with and without coagulation are strongly correlated with the ageing of particles along fluid trajectories or the mean tracer age.

Numerical investigation of the pollution dispersion in an urban street canyon

2006 ◽  
Vol 21 (4) ◽  
pp. 525-531 ◽  
Author(s):  
P. Neofytou ◽  
A.G. Venetsanos ◽  
S. Rafailidis ◽  
J.G. Bartzis
Keyword(s):  
Numerical Investigation ◽  
Street Canyon ◽  
Urban Street Canyon ◽  
Pollution Dispersion ◽  
Urban Street
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