KSME International Journal

, Volume 12, Issue 1, pp 96–111 | Cite as

Pollutant dispersion over two-dimensional hilly terrain

  • Hyun Goo Kim
  • Choung Mook Lee


Numerical prediction of the wind flow and pollutant dispersion over two-dimensional hilly terrain is presented. The wind tunnel experiments are conducted to validate the numerical results of the flow field. Measured mean velocity profiles, turbulence characteristics, and surface pressure distributions show good agreement with the numerical predictions. The hypothesis of Reynolds number independency for an atmospheric boundary layer flow over aerodynamically rough terrain is numerically confirmed. The linear theory provides generally good prediction of speed-up characteristics for gently sloped low hills. The effect of two-dimensional double hills on the dispersion of pollutants from continuously or temporally released line source of different emission heights and locations is also investigated. The ground-level concentrations are considerably reduced as emission heights are increased. The variances of ground-level concentration with respect to time from a temporally released source are strongly influenced by the flow separation.

Key Words

Atmospheric Boundary Layer Flow Separation Speed-Up Ground-Level-Concentration Pollutant Dispersion 


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Copyright information

© The Korean Society of Mechanical Engineers (KSME) 1998

Authors and Affiliations

  • Hyun Goo Kim
    • 1
  • Choung Mook Lee
    • 2
  1. 1.Advanced Fluids Engineering Research CenterPohang University of Science & TechnologyPohangKorea
  2. 2.Department of Mechanical EngineeringPOSTECHKorea

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