Environmental Fluid Mechanics

, Volume 14, Issue 6, pp 1381–1403 | Cite as

Large-eddy simulation of turbulent flow and dispersion over a complex urban street canyon

  • Kiyoung Moon
  • Jeong-Min Hwang
  • Byung-Gu Kim
  • Changhoon Lee
  • Jung-il Choi
Original Article

Abstract

Turbulent flow and dispersion characteristics over a complex urban street canyon are investigated by large-eddy simulation using a modified version of the Fire Dynamics Simulator. Two kinds of subgrid scale (SGS) models, the constant coefficient Smagorinsky model and the Vreman model, are assessed. Turbulent statistics, particularly turbulent stresses and wake patterns, are compared between the two SGS models for three different wind directions. We found that while the role of the SGS model is small on average, the local or instantaneous contribution to total stress near the surface or edge of the buildings is not negligible. By yielding a smaller eddy viscosity near solid surfaces, the Vreman model appears to be more appropriate for the simulation of a flow in a complex urban street canyon. Depending on wind direction, wind fields, turbulence statistics, and dispersion patterns show very different characteristics. Particularly, tall buildings near the street canyon predominantly generate turbulence, leading to homogenization of the mean flow inside the street canyon. Furthermore, the release position of pollutants sensitively determines subsequent dispersion characteristics.

Keywords

Large-eddy simulation Urban street canyon Pollutant dispersion  Tall building Subgrid scale model Turbulent flow 

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Copyright information

© Springer Science+Business Media Dordrecht 2014

Authors and Affiliations

  • Kiyoung Moon
    • 1
  • Jeong-Min Hwang
    • 2
  • Byung-Gu Kim
    • 2
  • Changhoon Lee
    • 1
    • 2
  • Jung-il Choi
    • 1
  1. 1.Department of Computational Science and EngineeringYonsei UniversitySeoul Republic of Korea
  2. 2.Department of Mechanical EngineeringYonsei UniversitySeoul Republic of Korea

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