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Modeling flow around bluff bodies and predicting urban dispersion using large eddy simulation.

Yu-Heng Tseng1, Charles Meneveau, Marc B Parlange

  • 1Department of Mechanical Engineering, Center for Environmental and Applied Fluid Mechanics, The Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, USA.

Environmental Science & Technology
|May 11, 2006
PubMed
Summary

This study introduces a large eddy simulation (LES) tool for urban air pollution modeling. It establishes minimum grid resolutions and subgrid model requirements for accurate dispersion simulations in complex urban environments.

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Area of Science:

  • Environmental fluid dynamics
  • Computational atmospheric science
  • Urban meteorology

Background:

  • Urban air pollutant transport is complex due to topography.
  • Traditional models struggle with detailed urban geometry and flow unsteadiness.

Purpose of the Study:

  • To develop and validate a large eddy simulation (LES) tool for urban dispersion.
  • To determine minimum grid resolution and subgrid model requirements for urban LES.

Main Methods:

  • Developed a new dynamic subgrid closure and boundary treatment for LES.
  • Validated the model on realistic urban layouts and conducted grid refinement studies.
  • Compared performance of various subgrid models for urban flow simulations.

Main Results:

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  • Established that 6-8 grid points across bluff bodies are needed for meaningful results.
  • Dynamic Lagrangian subgrid models provide more realistic subgrid-scale viscosity and velocity spectra.
  • LES offers advantages over traditional methods for complex urban boundary details and flow unsteadiness.

Conclusions:

  • Defined essential requirements for applying LES to urban atmospheric boundary layer flow and scalar transport.
  • LES can accurately simulate pollutant dispersion and evaluate extreme event probabilities in cities.
  • The developed LES tool is suitable for realistic urban geometry simulations.