CFD analysis on traffic-induced air pollutant dispersion under non-isothermal condition in a complex urban area in winter

2008 ◽  
Vol 96 (10-11) ◽  
pp. 1774-1788 ◽  
Author(s):  
Hong Huang ◽  
Ryozo Ooka ◽  
Hong Chen ◽  
Shinsuke Kato ◽  
Takeo Takahashi ◽  
...  
Keyword(s):  
Urban Area ◽  
Isothermal Condition ◽  
Pollutant Dispersion ◽  
Air Pollutant ◽  
Cfd Analysis ◽  
Air Pollutant Dispersion

Case Study of Nanjing Inner Ring on Air Pollution Dispersion from Roadway Tunnel Portals

2012 ◽  
Vol 610-613 ◽  
pp. 1895-1900 ◽  
Author(s):  
Shu Jiang Miao ◽  
Da Fang Fu
Keyword(s):  
Air Pollution ◽  
Pollutant Dispersion ◽  
Air Pollutant ◽  
Urban Traffic ◽  
Lagrangian Model ◽  
Pollution Dispersion ◽  
Piecewise Function ◽  
Air Pollutant Dispersion ◽  
Air Pollution Dispersion

The tunnel module of a rather simple Lagrangian model GRAL (Grazer Langrange model) has been chosen to study air pollutant dispersion around tunnel portals in Nanjing inner ring. Two points have been made to popularize GRAL3.5TM (the tunnel module of a Lagrangian model GRAL; the update was in May 2003) and assure it more suitable for the actual situations in Nanjing. One is to derive a piecewise function of the intermediate parameter ‘stiffness’. Another is to take Romberg NOx-NO2 scheme into account. After these 2 works on GRAL3.5TM, NO2 dispersion from portals of all the 6 tunnels in Nanjing inner ring has been simulated. The importance of limiting urban traffic volume to control air quality around tunnel portals and roadways has been emphasized.

scholarly journals Airflow Characteristics Downwind a Naturally Ventilated Pig Building with a Roofed Outdoor Exercise Yard and Implications on Pollutant Distribution

2020 ◽  
Vol 10 (14) ◽  
pp. 4931
Author(s):  
Qianying Yi ◽  
David Janke ◽  
Lars Thormann ◽  
Guoqiang Zhang ◽  
Barbara Amon ◽  
...  
Keyword(s):  
Air Pollutants ◽  
Pollutant Dispersion ◽  
Air Pollutant ◽  
Emission Mitigation ◽  
Surrounding Environment ◽  
Air Pollutant Dispersion ◽  
Treatment Technologies ◽  
Downwind Side ◽  
Pollutant Distribution ◽  
Wake Zone

The application of naturally ventilated pig buildings (NVPBs) with outdoor exercise yards is on the rise mainly due to animal welfare considerations, while the issue of emissions from the buildings to the surrounding environment is important. Since air pollutants are mainly transported by airflow, the knowledge on the airflow characteristics downwind the building is required. The objective of this research was to investigate airflow properties downwind of a NVPB with a roofed outdoor exercise yard for roof slopes of 5°, 15°, and 25°. Air velocities downwind a 1:50 scaled NVPB model were measured using a Laser Doppler Anemometer in a large boundary layer wind tunnel. A region with reduced mean air velocities was found along the downwind side of the building with a distance up to 0.5 m (i.e., 3.8 times building height), in which the emission concentration might be high. Additional air pollutant treatment technologies applied in this region might contribute to emission mitigation effectively. Furthermore, a wake zone with air recirculation was observed in this area. A smaller roof slope (i.e., 5° slope) resulted in a higher and shorter wake zone and thus a shorter air pollutant dispersion distance.

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