Comparative Study Of Concentrations And
Distributions Of CO And NO In An Urban Area:
Gaussian Plume Model And CFD Analysis
Author(s)
M. Bady, S. Kato, R. Ooka, H. Huang & T. Jiang
Abstract
The dispersion of air pollutants, CO and NO, due to three point sources and a
busy traffic road in a certain area located in the central part of Tokyo has been
studied using two different approaches. The first approach was based on the well
known Gaussian plume model (GPM) while the second approach was a
numerical modelling using a CFD code. In the first approach, the domain of
study was divided into a fine grid and the line source (road) was treated as a
number of continuous adjacent stacks. The number of ground level stacks was
taken according to the length of the road and the diameter of each stack was set
equal to the width of the road. The GPM of a point source was applied upon each
stack and the concentration at any receptor was calculated by applying the
principle of superposition. In the second approach, numerical analysis was
performed using the CFD code STAR-CD in order to simulate the wind flow
over the area considered by applying the standard k-ε turbulent model. Steady
state analysis was adopted and the second order upwind difference scheme was
applied to the spatial difference. Wind velocity in the first approach, was set
equal to the velocity at 10 m height for the ground level line source, and equal to
the velocity value at the stack height level for the three tall stacks, while in the
numerical approach, the wind velocity was obeying the power law relationship.
Results of the two approaches were compared together and their results have
shown the same trend for the distributions of CO and NO concentrations inside
the area of study. The agreement between the concentration values calculated by
the two approaches was good in less densely built-up locations inside the domain
of study, and it was not accepted in the high densely built-up sites.
Keywords: Gaussian plume model, CFD, pollutant concentration, CO and NO.
Keywords
Gaussian plume model, CFD, pollutant concentration, CO and NO.
Related Book
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