Modelling of Flow Structure and Pollutant Dispersion in Symmetric Street Canyon

Abstract:

The quality of air condition is one of the major factors affecting the health of people living in urban areas. Different geometry of street canyon coupled with different wind direction will result in various concentration of pollutant accumulated in the canyon. The purpose of this research is to study the flow structure and also pollutant dispersion in a 3-D symmetric street canyon using computational fluid dynamics. Different k-Ɛ turbulent models are used to simulate the flow structure and the result is compared to experimental. The effects of aspect ratio and Reynolds Number to the flow structure and pollutant dispersion in a street canyon are investigated. The studied canyons are avenue, regular and deep canyon with aspect ratio of 0.4, 1 and 2 respectively and Reynolds Numbers of 9000 and 30700.

• Periodical: Applied Mechanics and Materials (Volume 695)
• Pages: 530-534
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.695.530
• Online since: November 2014
• Authors: Nur Hamizah Mohamad Yusoff, Nor Azwadi Che Sidik
• Keywords: Flow Structure, Fluent, K-Ɛ Model, Pollutant Dispersion, Symmetric Street Canyon

References

[1] J. Allegrini, V. Dorer, J. Carmeliet, Wind Tunnel Measurement of Buoyant Flows in Street Canyons, Building and Environment. 35 (2012) 234-256.

DOI: 10.1016/j.buildenv.2012.08.029

[2] J.J. Baik, J.J. Kim, A Numerical Study of Flow and Pollutant Dispersion Characteristics in Urban Street Canyon, Journal of Applied Meteorology. 38 (1998) 1576-1590.

DOI: 10.1175/1520-0450(1999)038<1576:ansofa>2.0.co;2

[3] T. Banerjee, R.A. Christian, Three Dimensional Analysis of Pollution Dispersion in Street Canyon, World Academy of Science, Engineering and Technology. 81 (2011) 863-869.

[4] T.L. Chan, G. Dong, C.W. Leung, C.S. Cheung, W.T. Hung, Validation of a Two-Dimensional Pollutant Dispersion Model in an Isolated Street Canyon, Atmospheric Environment. 36 (2002) 861-872.

DOI: 10.1016/s1352-2310(01)00490-3

[5] H. Huang, Y. Akutsu, M. Arai, M. Tamura, A Two-Dimensional Air Quality Model in an Urban Street Canyon: Evaluation and Sensitivity Analysis, Atmospheric Environment. 34 (2000) 689-698.

DOI: 10.1016/s1352-2310(99)00333-7

[6] Taneeb, The Preliminary Study on The Ventilation of Long Highway Tunnels in Kaohsiung City. Taiwan Area National Expressway Engineering Bureau, Ministry of Transportation and Communication. (1991).

[7] M.Y. Tsai, K.S. Chen, Measurements and Three-Dimensional Modelling of Air Pollutant Dispersion in an Urban Street Canyon, Atmospheric Environment. 38 (2004) 5911–5924.

DOI: 10.1016/j.atmosenv.2004.07.008