10.2190/ES.33.1.c N120098103234157 3 A CFD Model for Simulating Area Source Pollutant Dispersion in Urban Canyon 29 55 20120119 20120119 20120119 20120119 N120098103234157.pdf http://baywood.metapress.com/link.asp?target=contribution&id=N120098103234157 1 Peng Wang Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, China In this article, the urban canyon flow and dispersion field, turbulent kinetic energy field and pollutant concentration field are obtained by a three-dimensional computational fluid dynamics (CFD) model. The governing equations are the Reynolds-averaged equations of momentum, mass continuity, heat, and other scalar (here, passive pollutant) under the Boussinesq approximation with k-ε turbulent model. The concentration field in different layers of three planes was examined through making slices of flow field and streamline field. Through the analysis of the wind speed profile, turbulent kinetic energy profile and wind direction profile at the position of upwind, downwind, and middle canyon, some useful results were obtained. The simulation results were compared with the available wind tunnel experiments (Meroney et al., 1996) and favorable agreement between them was found.

Ahmadi, G., & Li, A. (2000). Computer simulation of particle transport and deposition near a small isolated building. Journal of Industrial Aerodynamics, 84, 23-46.

Assimakopoulos, V. D., Apsimon, H. M., & Moussiopoulos, N. (2003). A numerical study of atmospheric pollutant dispersion in different two-dimensional street canyon configurations. Atmospheric Environment, 37, 4037-4049.

Baik, J.-J., Kang, Y.-S., & Kim, J.-J. (2007). Modeling reactive pollutant dispersion in an urban street canyon. Atmospheric Environment, 41, 934-949.

Baik, J.-J., & Kim, J.-J. (1999). A numerical study of flow and pollutant dispersion characteristics in urban street canyons. Journal of Applied Meteorology, 38, 1576-1589.

Baik, J.-J., & Kim, J.-J. (2002). On the escape of pollutants from urban street canyons. Atmospheric Environment, 36, 527-536.

Baik, J.-J., Kim, J.-J., & Fernando, H. J. S. (2003). A CFD model for simulating urban flow and dispersion. Journal of Applied Meteorology, 42, 1636-1648.

Chan, T. L., Dong, G., Leung, C. W, Cheung, C. S., & Hung, W. T. (2002). Validation of a two-dimensional pollutant dispersion model in an isolated street canyon. Atmospheric Environment, 36(5), 861-872.

Chan, A. T., Au, W. T. W., So, E. S. P. (2003). Strategic guideline for street canyon geometry to achieve sustainable street air quality. Part II: Multiple canopies and canyons. Atmospheric Environment, 37, 2761-2772.

Fluent User's Guide (Vols. 1-4) (2005). Fluent Inc., Centerra Resource Park, Lebanon, NH.

Hassan, A. A., Crowther, J. M. (1998). Modeling of fluid flow and pollutant dispersion in a street canyon. Environmental Monitoring and Assessment, 52, 281-297.

Kim, J.-J., & Baik, J.-J. (2003). Effects of inflow turbulence intensity on flow and pollutant dispersion in an urban street canyon. Journal of Wind Engineering and Industrial Aerodynamics, 91, 309-329.

Kastner-Klein, P., and Fedorovich, E. A. (2001). Wind tunnel study of organized and turbulent air motions in street canyons. Journal of Wind Engineering and Industrial Aerodynamics, 89, 849-861.

Kim, J.-J., & Baik, J.-J. (2004). A numerical study of the effects of ambient wind direction on flow and dispersion in urban street canyons using the RNG k-ε turbulence model. Atmospheric Environment, 38, 3039-3048.

Koutsourakis, N., Neofytou, P., Venetsanos, A. G., & Bartzis, J. G. (2005). Parametric study of the dispersion aspects in a street-canyon area. International Journal of Environment and Pollution, 25, 155-163.

Leitl, B. M., & Meroney, R. N. (1997). Car exhaust dispersion in a streetcanyon: numerical critique of a wind tunnel experiment. Journal of Wind Engineering and Industrial Aerodynamics, 67, 68, 293-304.

Mensink, C., Lewyckyj, N., & Janssen, L. (2002). A new concept for air quality modeling in street canyons. Water, Air and Soil Pollution: Focus, 2, 339-349.

Meroney, R. N., Pavageau, M., Rafailidis, S., & Schatzmann, M. (1996). Study of line source characteristics for 2-D physical modeling of pollutant dispersion in street canyons. Journal of Wind Engineering and Industrial Aerodynamics, 62, 37-56.

Neofytou, P., Venetsanos, A. G., Rafailidis, S., & Bartzis, J. G. (2006). Numerical investigation of the pollution dispersion in an urban street canyon. Environmental Modeling and Software, 21, 525-531.

Park, Y.-S., & Baik, J.-J. (2008). Analytical solution of the advection-diffusion equation for a ground-level finite area source. Atmospheric Environment, 42, 9063-9069.

Patankar, S. V. (1980). Numerical heat transfer and fluid flow. McGraw-Hill, New York.

Ryu, Y.-H., & Baik, J.-J. (2009). Flow and dispersion in an urban cubical cavity. Atmospheric Environment, 43, 1721-1729.

Sahm, P., Louka, P., Ketzel, M., Guillouteau, E., & Sini, J.-F. (2002). Intercomparison of numerical urban dispersion models. Part I: Street canyon and single building configurations. Water, Air and Soil Pollution: Focus, 2, 587-601.

Xie, X., Huang, Z., & Wang, J.-S. (2005). Impact of building configuration on air quality in street canyon. Atmospheric Environment, 39, 4519-4530.

Yassin, M. F., Kellnerova, R., & Janour, Z. (2009). Impact of street intersections on air quality in an urban environment. Atmospheric Environment, 43, 1721-1729.