Large-Eddy Simulation is used to simulate wind-induced pollutant dispersion from a vent on the roof of a cubical building. The profiles of the computed mean value and standard deviation of the concentration in the wake of the building are compared to wind-tunnel measurements and good agreement is found. The velocity and concentration values at two monitoring points located in the shear layer de...

Apartment complexes in various forms are built in downtown areas. The arrangement of an apartment complex has great influence on the wind flow inside it. There are issues of residents' walking due to gust occurrence within apartment complexes, problems with pollutant emission due to airflow congestion, and heat island and cool island phenomena in apartment complexes. Currently, the forms of int...

Pollutant transport due to the turbulent wind flow around buildings is a complex phenomenon which is challenging to reproduce with Computational Fluid Dynamics (CFD). In the present study we use Large-Eddy Simulation (LES) to investigate the turbulent mass transport mechanism in the case of gas dispersion around an isolated cubical building. Close agreement is found between wind-tunnel measurem...

This paper presents experimental and computational investigation of the dispersion mechanisms of a passive-type tracer gas, done in the scaled, three-dimensional model of a street canyon. At a low wind speed of 1.67m/s and neutral atmospheric conditions, dispersion of pollutant has been investigated within an isolated street canyon at an aspect ratio of 1 for perpendicular wind orientation (90)...

7 Wind tunnel measurements downwind of reduced scale car models have been made to study the 8 wake regions in detail, test the usefulness of existing vehicle wake models, and draw key 9 information needed for dispersion modelling in vehicle wakes. The experiments simulated a car 10 moving in still air. This is achieved by (i) the experimental characterisation of the flow, turbulence 11 and conc...

Ammonia emissions from naturally ventilated livestock buildings (NVLBs) pose a serious environmental problem. However, the mechanisms that control these are still not fully understood. One promising method for understanding is physical modelling in wind tunnels. This paper reviews studies have used this to investigate flow or pollutant dispersion within NVLBs. The review indicates importance of...

Greening cities is a key solution to improve the urban microclimate and mitigate impact of climate change. However, effect tree planting on pollutant dispersion in streets still debated topic. To shed light this issue, we present wind-tunnel experiment aimed at investigating trees street canyon ventilation. An idealized district was simulated by an array blocks, two rows model were arranged sid...