Flow patterns around buildings have a strong influence on pollutant dispersion derived from sources placed within the urban area. Computational fluid dynamics (CFD) codes are used to provide solutions to the fundamental fluid dynamics equations at spatial scales smaller than the typical urban ones. In this work, dispersion of pollutant from sources near buildings forming various street canyons is studied by means of the general purpose CFD code FLUENT to investigate the influence of small geometric features on pollutant concentration distributions. Firstly, we study the effects of a complex geometry on the flow near the ground by considering a finite array of rectangular and square-shaped rings of buildings with different aspect ratios. Secondly, we study transport and diffusion of pollutant within a finite array of rectangular buildings. FLUENT concentration results are validated against wind tunnel data (CEDVAL, 2002). Numerical simulations are performed using the Reynolds Averaged Nervier-Stokes (RANS) k-ε turbulence model and the advection-diffusion model. The paper documents the potential of a general purpose CFD model for the simulation of pollutant dispersion close to emission sources and within complex building arrangements in an operational context.
Chapter 1.1 Application and validation of FLUENT flow and dispersion modelling within complex geometries
BUCCOLIERI, RICCARDO;
2007-01-01
Abstract
Flow patterns around buildings have a strong influence on pollutant dispersion derived from sources placed within the urban area. Computational fluid dynamics (CFD) codes are used to provide solutions to the fundamental fluid dynamics equations at spatial scales smaller than the typical urban ones. In this work, dispersion of pollutant from sources near buildings forming various street canyons is studied by means of the general purpose CFD code FLUENT to investigate the influence of small geometric features on pollutant concentration distributions. Firstly, we study the effects of a complex geometry on the flow near the ground by considering a finite array of rectangular and square-shaped rings of buildings with different aspect ratios. Secondly, we study transport and diffusion of pollutant within a finite array of rectangular buildings. FLUENT concentration results are validated against wind tunnel data (CEDVAL, 2002). Numerical simulations are performed using the Reynolds Averaged Nervier-Stokes (RANS) k-ε turbulence model and the advection-diffusion model. The paper documents the potential of a general purpose CFD model for the simulation of pollutant dispersion close to emission sources and within complex building arrangements in an operational context.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
