A CFD Model for Simulating Area Source Pollutant Dispersion in Urban Canyon

2011 ◽  
Vol 33 (1) ◽  
pp. 29-55
Author(s):  
Peng Wang
Keyword(s):  
Pollutant Dispersion ◽  
Urban Canyon ◽  
Cfd Model ◽  
Area Source

scholarly journals Analysis of Pollutant Dispersion in a Realistic Urban Street Canyon Using Coupled CFD and Chemical Reaction Modeling

Atmosphere ◽  
2019 ◽  
Vol 10 (9) ◽  
pp. 479 ◽  
Author(s):  
Franchesca Gonzalez Olivardia ◽  
Qi Zhang ◽  
Tomohito Matsuo ◽  
Hikari Shimadera ◽  
Akira Kondo
Keyword(s):  
Chemical Reaction ◽  
Street Canyon ◽  
Three Dimensional ◽  
Pollutant Dispersion ◽  
Reaction Model ◽  
Building Envelope ◽  
Surface Energy Budget ◽  
Urban Canyon ◽  
Cfd Model ◽  
Chemical Reaction Model

Studies in actual urban settings that integrate chemical reaction modeling, radiation, and particular emissions are mandatory to evaluate the effects of traffic-related air pollution on street canyons. In this paper, airflow patterns and reactive pollutant behavior for over 24 h, in a realistic urban canyon in Osaka City, Japan, was conducted using a computational fluid dynamics (CFD) model coupled with a chemical reaction model (CBM-IV). The boundary conditions for the CFD model were obtained from mesoscale meteorological and air quality models. Inherent street canyon processes, such as ground and wall radiation, were evaluated using a surface energy budget model of the ground and a building envelope model, respectively. The CFD-coupled chemical reaction model surpassed the mesoscale models in describing the NO, NO2, and O3 transport process, representing pollutants concentrations more accurately within the street canyon since the latter cannot capture the local phenomena because of coarse grid resolution. This work showed that the concentration of pollutants in the urban canyon is heavily reliant on roadside emissions and airflow patterns, which, in turn, is strongly affected by the heterogeneity of the urban layout. The CFD-coupled chemical reaction model characterized better the complex three-dimensional site and hour-dependent dispersion of contaminants within an urban canyon.

scholarly journals A CFD model for pollutant dispersion in rivers

2004 ◽  
Vol 21 (4) ◽  
pp. 557-568 ◽  
Author(s):  
K. Modenesi ◽  
L. T. Furlan ◽  
E. Tomaz ◽  
R. Guirardello ◽  
J. R. Núnez
Keyword(s):  
Pollutant Dispersion ◽  
Cfd Model

A comparison of measurements and CFD model predictions for pollutant dispersion in cities

2004 ◽  
Vol 334-335 ◽  
pp. 185-195 ◽  
Author(s):  
J. Pospisil ◽  
J. Katolicky ◽  
M. Jicha
Keyword(s):  
Pollutant Dispersion ◽  
Cfd Model ◽  
Model Predictions

scholarly journals Urban Flow and Dispersion Simulation Using a CFD Model Coupled to a Mesoscale Model

2009 ◽  
Vol 48 (8) ◽  
pp. 1667-1681 ◽  
Author(s):  
Jong-Jin Baik ◽  
Seung-Bu Park ◽  
Jae-Jin Kim
Keyword(s):  
Wind Speed ◽  
Boundary Conditions ◽  
Mesoscale Model ◽  
Model Simulation ◽  
Pollutant Dispersion ◽  
Time Dependent ◽  
Cfd Model ◽  
Ambient Wind ◽  
Mm5 Model ◽  
Urban Flow

Abstract Flow and pollutant dispersion in a densely built-up area of Seoul, Korea, are numerically examined using a computational fluid dynamics (CFD) model coupled to a mesoscale model [fifth-generation Pennsylvania State University–National Center for Atmospheric Research Mesoscale Model (MM5)]. The CFD model used is a Reynolds-averaged Navier–Stokes equations model with the renormalization group k − ɛ turbulence model. A one-way nesting method is employed in this study. MM5-simulated data are linearly interpolated in time and space to provide time-dependent boundary conditions for the CFD model integration. In the MM5 simulation, four one-way nested computational domains are considered, and the innermost domain with a horizontal grid size of 1 km covers the Seoul metropolitan area and its adjacent areas, including a part of the Yellow Sea. The NCEP final analysis data are used as initial and boundary conditions for MM5. MM5 is integrated for 48 h starting from 0300 LST 1 June 2004 and the coupled CFD–MM5 model is integrated for 24 h starting from 0300 LST 2 June 2004. During the two-day period, a high-pressure system was dominant over the Korean peninsula, with clear conditions and weak synoptic winds. MM5 simulates local circulations characterized by sea breezes and mountain/valley winds. MM5-simulated synoptic weather and near-surface temperatures and winds are well matched with the observed ones. Results from the coupled CFD–MM5 model simulation show that the flow in the presence of real building clusters can change significantly as the ambient wind speed and direction change. Diurnally varying local circulations mainly cause changes in ambient wind speed and direction in the present simulation. Some characteristic flows—such as the double-eddy circulation, channeling flow, and vertical recirculation vortex—are simulated. Pollutant dispersion pattern and the degree of lateral pollutant dispersion are shown to be complicated in the presence of real building clusters and under varying ambient wind speed and direction. This study suggests that because of the sensitive dependency of urban flow and pollutant dispersion on variations in ambient wind, time-dependent boundary conditions should be used to better simulate or predict them when the ambient wind varies over the period of CFD model simulation.

Evaluation of CFD model predictions of local dispersion from an area source on a complex industrial site

2011 ◽  
Vol 44 (1/2/3/4) ◽  
pp. 173 ◽  
Author(s):  
Richard Hill ◽  
Alistair Arnott ◽  
Paul Hayden ◽  
Tom Lawton ◽  
Alan Robins ◽  
...  
Keyword(s):  
Industrial Site ◽  
Cfd Model ◽  
Area Source ◽  
Local Dispersion ◽  
Model Predictions

CFD MODEL OF AN AUTOMOTIVE CONDENSER AND ITS PERFORMANCE STUDIES UNDER RESTRICTED AIRFLOW CONDITION

2018 ◽  
Author(s):  
Thakor Vatsal ◽  
Vikas Pulinkuzhi ◽  
Santanu Prasad Datta
Keyword(s):  
Performance Studies ◽  
Cfd Model ◽  
Airflow Condition
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