Boundary-Layer Meteorology

, Volume 138, Issue 2, pp 195–213 | Cite as

Large-Eddy Simulation for the Mechanism of Pollutant Removal from a Two-Dimensional Street Canyon

  • Takenobu Michioka
  • Ayumu Sato
  • Hiroshi Takimoto
  • Manabu Kanda


Large-eddy simulation (LES) is conducted to investigate the mechanism of pollutant removal from a two-dimensional street canyon with a building-height to street-width (aspect) ratio of 1. A pollutant is released as a ground-level line source at the centre of the canyon floor. The mean velocities, turbulent fluctuations, and mean pollutant concentration estimated by LES are in good agreement with those obtained by wind-tunnel experiments. Pollutant removal from the canyon is mainly determined by turbulent motions, except in the adjacent area to the windward wall. The turbulent motions are composed of small vortices and small-scale coherent structures of low-momentum fluid generated close to the plane of the roof. Although both small vortices and small-scale coherent structures affect pollutant removal, the pollutant is largely emitted from the canyon by ejection of low-momentum fluid when the small-scale coherent structures appear just above the canyon where the pollutant is retained. Large-scale coherent structures also develop above the canyon, but they do not always affect pollutant removal.


Gas exchange Large-eddy simulation Urban canyon Wind-tunnel experiment 


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  1. Boris JP, Book DL (1976) Flux-corrected transport III: minimal-error FCT algorithms. J Comput Phys 20: 397–431CrossRefGoogle Scholar
  2. Cai X-M, Barlow JF, Belcher SE (2008) Dispersion and transfer of passive scalars in and above street canyons—large-eddy simulations. Atmos Environ 42: 5885–5895CrossRefGoogle Scholar
  3. Cheng WC, Liu C-H, Leung DYC (2008) Computational formulation for the evaluation of street canyon ventilation and pollutant removal performance. Atmos Environ 42: 9041–9051CrossRefGoogle Scholar
  4. Coceal O, Dobre A, Thomas TG, Belcher SE (2007) Structure of turbulent flow over regular arrays of cubical roughness. J Fluid Mech 589: 375–409CrossRefGoogle Scholar
  5. Cui Z, Cai X, Baker CJ (2004) Large-eddy simulation of turbulent flow in a street canyon. Q J R Meteorol Soc 130: 1373–1394CrossRefGoogle Scholar
  6. Germano M, Piomelli U, Moin P, Cabot WH (1991) A dynamic subgrid-scale eddy viscosity model. Phys Fluids A 3: 1760–1766CrossRefGoogle Scholar
  7. Inagaki A, Kanda M (2010) Organized structure of active turbulence over an array of cubes within the logarithmic layer of atmospheric flow. Boundary-Layer Meteorol 135: 209–228CrossRefGoogle Scholar
  8. Irwin HPAH (1981) The design of spires for wind simulation. J Wind Eng Ind Aerodyn 7: 361–366CrossRefGoogle Scholar
  9. Johnson GT, Hunter LJ (1995) A numerical study of dispersion of passive scalars in city canyons. Boundary-Layer Meteorol 75: 235–262CrossRefGoogle Scholar
  10. Kanda M (2006) Large-eddy simulations on the effects of surface geometry of building arrays on turbulent organized structures. Boundary-Layer Meteorol 118: 151–168CrossRefGoogle Scholar
  11. Kanda M, Moriwaki R, Kasamatsu F (2004) Large-eddy simulation of turbulent organized structures within and above explicitly resolved cube arrays. Boundary-Layer Meteorol 112: 343–368CrossRefGoogle Scholar
  12. Kim J, Moin P (1985) Application of a fractional-step method to incompressible Navier–Stokes equations. J Comput Phys 59: 308–323CrossRefGoogle Scholar
  13. Krogstad P-A, Antonia RA (1994) Structure of turbulent boundary layers on smooth and rough walls. J Fluid Mech 277: 1–21CrossRefGoogle Scholar
  14. Krogstad P-A, Andersson HI, Bakken OM, Ashrafian A (2005) An experimental and numerical study of channel flow with rough walls. J Fluid Mech 530: 327–352CrossRefGoogle Scholar
  15. Leonardi S, Orlandi R, Djenidi L, Antonia RA (2004) Structure of turbulent channel flow with square bars on one wall. Int J Heat Fluid Flow 25: 384–392CrossRefGoogle Scholar
  16. Lesieur M, Metais O, Comte P (2005) Large-eddy simulations of turbulence. Cambridge University Press, Cambridge, UK, p 219Google Scholar
  17. Letzel MO, Krane M, Raasch S (2008) High resolution urban large-eddy simulation studies from street canyon to neighborhood scale. Atmos Environ 42: 8770–8784CrossRefGoogle Scholar
  18. Li X-X, Liu C-H, Leung DYC (2008) Large-eddy simulation of flow and pollutant dispersion in high-aspect-ratio urban street canyons with wall model. Boundary-Layer Meteorol 129: 249–268CrossRefGoogle Scholar
  19. Lilly DK (1992) A proposed modification of the Germano subgrid-scale closure method. Phys Fluids A 4: 633–636CrossRefGoogle Scholar
  20. Liu C-H, Barth MC (2002) Large-eddy simulation of flow and scalar transport in a modeled street canyon. J Appl Meteorol 41: 660–673CrossRefGoogle Scholar
  21. Liu C-H, Barth MC, Leung DYC (2004) Large-eddy simulation of flow and pollutant transport in street canyons of different building-height-to-street-width ratios. J Appl Meteorol 43: 1410–1424CrossRefGoogle Scholar
  22. Liu C-H, Leung DYC, Barth MC (2005) On the prediction of air and pollutant exchange rates in street canyons of different aspect ratios using large-eddy simulation. Atmos Environ 39: 1567–1574Google Scholar
  23. Meroney R, Pavageau M, Rafailidis S, Schatzmann M (1996) Study of line source characteristics for 2-D physical modeling of pollutant dispersion in street canyons. J Wind Eng Ind Aerodyn 62: 37–56CrossRefGoogle Scholar
  24. Michioka T, Kuorse R, Sada K, Makino H (2005) Direct numerical simulation of a particle-laden mixing layer with a chemical reaction. Int J Multiph Flow 31: 843–866CrossRefGoogle Scholar
  25. Pavageau M, Schatzmann M (1999) Wind tunnel measurements of concentration fluctuations in an urban street canyon. Atmos Environ 33: 3961–3971CrossRefGoogle Scholar
  26. Reynolds RT, Castro IP (2008) Measurements in an urban-type boundary layer. Exp Fluids 45: 141–156CrossRefGoogle Scholar
  27. Salizzoni P, Soulhac L, Mejean P (2009) Street canyon ventilation and atmospheric turbulence. Atmos Environ 43: 5056–5067CrossRefGoogle Scholar
  28. Tanahashi M, Hirayama T, Taka S, Miyauchi T (2008) Measurement of fine scale structure in turbulence by time-resolved dual-plane stereoscopic PIV. Int J Heat Fluid Flow 29: 792–802CrossRefGoogle Scholar
  29. Tomkins CD, Adrian RJ (2003) Spanwise structure and scale growth in turbulent boundary layers. J Fluid Mech 490: 37–74CrossRefGoogle Scholar
  30. Walton A, Cheng AYS (2002) Large-eddy simulation of pollution dispersion in an urban street canyon—part II: idealized canyon simulation. Atmos Environ 36: 3615–3627CrossRefGoogle Scholar
  31. Wang Y, Tanahashi M, Miyauchi T (2007) Coherent fine scale eddies in turbulence transition of spatially-developing mixing layer. Int J Heat Fluid Flow 28: 1280–1290CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • Takenobu Michioka
    • 1
  • Ayumu Sato
    • 1
  • Hiroshi Takimoto
    • 2
  • Manabu Kanda
    • 2
  1. 1.Environmental Science Research LaboratoryCentral Research Institute of Electric Power IndustryChiba-kenJapan
  2. 2.Department of International Development EngineeringTokyo Institute of TechnologyTokyoJapan

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