Air flow and dispersion in rough terrain: a report on Euromech 173

Euromech Colloquium 173 was held at Delphi from 13-16 September 1983. Thirty-six participants from eleven countries were present. Papers were presented on: (1) various approaches to calculating and computing air flow in rough terrain in the presence of changes in surface roughness, elevation and temperatures, including methods for interpolating, subject to certain physical constraints, the wind field from measurements at various fixed stations; (2) measurement and satellite photography of air flow in rough terrain near isolated mountains, near coastlines, over mountains, and over mountains near coastlines; (3) the applications of these studies to air-pollution dispersion and the exploitation of wind energy in rough terrain. The discussions led to agreement about how best to use and relate the various techniques for calculating air flows, the role of new techniques in remote sensing for improving understanding of flow in rough terrain, the factors determining air-pollution concentration that need particular study, and the special kinds of information about turbulence needed for estimating wind energy in rough terrain.

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Modeling and simulation of air pollutant distribution in street canyon area with Skytrain stations

Advances in Difference Equations ◽

10.1186/s13662-019-2382-z ◽

2019 ◽

Vol 2019 (1) ◽

Author(s):

Suranath Chomcheon ◽

Nathnarong Khajohnsaksumeth ◽

Benchawan Wiwatanapataphee ◽

Xiangyu Ge

Keyword(s):

Air Pollution ◽

Street Canyon ◽

Air Flow ◽

Air Pollutant ◽

Navier Stokes ◽

Pollution Dispersion ◽

Convection Diffusion ◽

Air Pollution Dispersion ◽

Compressible Turbulent Flow ◽

The Impact

Abstract This paper focuses on effects of the wind flow velocity on the air flow and the air pollution dispersion in a street canyon with Skytrain. The governing equations of air pollutants and air flow in this study area are the convection–diffusion equations of species concentration and the Reynolds-averaged Navier–Stokes (RANS) equations of compressible turbulent flow, respectively. Finite element method is utilized for the solution of the problem. To investigate the impact of the air flow on the pattern of air pollution dispersion, three speeds of inlet wind in three different blowing directions are chosen. The results illustrate that our model can depict the airflows and dispersion patterns for different wind conditions.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.610-613.1895 ◽

2012 ◽

Vol 610-613 ◽

pp. 1895-1900 ◽

Cited By ~ 3

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.

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