Investigation of dust dispersion in urban environment using large eddy simulation method

Document Type : Research Article

Authors

1 associate prof./ Mechanical faculty/K.N.Toosi university of technology

2 Faculty of Mechanical Engineering, K. N. Toosi university of technology, Tehran, Iran

3 Faculty of Mechanical Engineering, K. N. Toosi University of technology, Tehran, Iran

Abstract

Pollution and the distribution of dust in urban areas have caused a wide range of diseases. Dust is one of the environmental phenomena that has caused adverse effects on health and the environment. Contamination caused by dust of different origins is spread across a wide range of atmospheres. Our understanding of the mechanism of dust distribution and the turbulence in urban areas is very important, which helps us reduce the effects of these types of contaminants. Computational Fluid Dynamics models have been considered in this study due to the economical approach to research in the field of dust distribution. Due to the turbulence of the wind flow inside the city, we use the large eddy simulation method to model this turbulence, which is widely used in computational wind engineering. In this study, we have investigated the dust in the urban area. For this purpose, the effect of the wind direction angle and the urban environment as well as the height of the buildings on the speed distribution and dispersion of fine dust with time has been investigated in two separate computing spaces. By comparing the results between 0° and 10° angle, it has been observed that with the increase of the flow turbulence intensity angle, these turbulent characteristics lead to the dispersion and persistence of fine dust in the urban environment. By comparing the results, we conclude that by creating an angle in the urban area due to increased mixing, the amount of dust distribution in the urban area rises.

Keywords

Main Subjects

References

  1. M. Carpentieri, A.G. Robins, Influence of urban morphology on air flow over building arrays, Journal of Wind Engineering and Industrial Aerodynamics, 145 (2015) 61-74.
  2. J.-J. Baik, R.-S. Park, H.-Y. Chun, J.-J. Kim, A laboratory model of urban street-canyon flows, Journal of Applied Meteorology and Climatology, 39(9) (2000) 1592-1600.
  3. J. Baker, H.L. Walker, X. Cai, A study of the dispersion and transport of reactive pollutants in and above street canyons—a large eddy simulation, Atmospheric Environment, 38(39) (2004) 6883-6892.
  4. C.-H. Chang, R.N. Meroney, Numerical and physical modeling of bluff body flow and dispersion in urban street canyons, Journal of Wind Engineering and Industrial Aerodynamics, 89(14-15) (2001) 1325-1334.
  5. Z.-T. Xie, O. Coceal, I.P. Castro, Large-eddy simulation of flows over random urban-like obstacles, Boundarylayer meteorology, 129 (2008) 1-23.
  6. T. Van Hooff, B. Blocken, Coupled urban wind flow and indoor natural ventilation modelling on a high-resolution grid: A case study for the Amsterdam ArenA stadium, Environmental Modelling & Software, 25(1) (2010) 51-.56
  7. M. Jahangiri, R. Babae, A. Sedaghat, Numerical study of the effect of wind speed on the pollutants dispersion in the channel of an urban street, in:  The 5th National Confrence on environmental Engineering and Management (5CEEM)-31 May 2023, 2011.
  8. M. Llaguno-Munitxa, E. Bou-Zeid, M. Hultmark, The influence of building geometry on street canyon air flow: validation of large eddy simulations against wind tunnel experiments, Journal of Wind Engineering and Industrial Aerodynamics, 165 (2017) 115-130.
  9. S. Murakami, A. Mochida, Y. Hayashi, S. Sakamoto, Numerical study on velocity-pressure field and wind forces for bluff bodies by κ-ϵ, ASM and LES, Journal of Wind Engineering and Industrial Aerodynamics, 44(1-3) (1992) 2841-2852.
  10. R.N. Meroney, B.M. Leitl, S. Rafailidis, M. Schatzmann, Wind-tunnel and numerical modeling of flow and dispersion about several building shapes, Journal of Wind Engineering and Industrial Aerodynamics, 81(13) (1999) 333-345.
  11. Y. Zhiyin, Large-eddy simulation: Past, present and the future, Chinese journal of Aeronautics, 28(1) (2015) 11-24.
  12. E. Aristodemou, L.M. Boganegra, L. Mottet, D. Pavlidis, A. Constantinou, C. Pain, A. Robins, H. ApSimon, How tall buildings affect turbulent air flows and dispersion of pollution within a neighbourhood, Environmental pollution, 233 (2018) 782-796.
  13. M.K. Moayyedi, V. Azadi Talab, Modeling of turbulent atmospheric boundary layer and dispersion of solid pollutant particles in an urban area using large eddy simulation, Amirkabir Journal of Mechanical Engineering, 53(5) (2021) 2839-2856 (in persian).
  14. A. Fluent, Ansys Fluent 12.0 theory guide, ANSYS Inc., Canonsburg, PA,  (2009).
  15. D. Drew, R. Lahey Jr, The virtual mass and lift force on a sphere in rotating and straining inviscid flow, International Journal of Multiphase Flow, 13(1) (1987) .121-311
  16. D.A. Lyn, S. Einav, W. Rodi, J.-H. Park, A laserDoppler velocimetry study of ensemble-averaged characteristics of the turbulent near wake of a square cylinder, Journal of Fluid Mechanics, 304 (1995) 285319.
  17. J. Franke, A. Hellsten, H. Schlünzen, B. Carissimo, Best practice guideline for the CFD simulation of flows in the urban environment, COST European Cooperation in Science and Technology, 2007.
  18. F. Baetke, H. Werner, H. Wengle, Numerical simulation of turbulent flow over surface-mounted obstacles with sharp edges and corners, Journal of wind engineering and industrial aerodynamics, 35 (1990) 129147.
  19. Y. Yu, K. Kwok, X. Liu, Y. Zhang, Air pollutant dispersion around high-rise buildings under different angles of wind incidence, Journal of Wind Engineering and Industrial Aerodynamics, 167 (2017) 51-61.
  20. Gousseau, B. Blocken, T. Stathopoulos, G. Van Heijst, CFD simulation of near-field pollutant dispersion on a high-resolution grid: A case study by LES and RANS for a building group in downtown Montreal, Atmospheric Environment, 45(2) (2011) 428-438.
Amirkabir Journal of Mechanical Engineering
Volume 55, Issue 11
February 2024
Pages 1299-1318

Files

Share

How to cite

Statistics