Simulating Urban Flow and Dispersion of Air Pollution Using FLUENT and WRF Models (Case Study of Imam Khomeini Street in Yazd

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MEMARIAN M.H.; HATAMI SH.

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Journal: JOURNAL OF METEOROLOGY AND ATMOSPHERIC SCIENCES (JMAS) Year:2018 | Volume:1 | Issue:1 Page(s): 13-24

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Title

Simulating Urban Flow and Dispersion of Air Pollution Using FLUENT and WRF Models (Case Study of Imam Khomeini Street in Yazd

Author(s)

MEMARIAN M.H. | HATAMI SH. | Issue Writer Certificate

Keywords

CFD

WRF

FLUENT

pollution dispersion

turbulent flow

Abstract

The streets play an important role in preserving pollution and fuel consumption. Therefore, geometrical and meteorological conditions are of interest to researchers. The geometrical parameters include building shape, orientation and aspect ratio (W/H), which is the ratio of the building height (H) to building width (W). The meteorological parameters include ambient wind speed, direction and thermal stability. Furthermore, the design and construction of streets and buildings should be considered, since the presence of buildings in the streets can affect meteorological parameters. For example, there must be enough wind speed to eliminate the pollutant in the street. In recent decades, numerical models have been one of the most commonly used tools for urban planning in ventilation optimization units. In this study, the air flow and dispersion of pollutants in a narrow street in the city of Yazd are investigated numerically, using the combination of a computational fluid dynamics model (FLUENT model) with a mesoscale model (WRF). The WRF is a numerical weather forecast, and a simulation of an atmospheric systems model that is designed for research and operational applications. In the case of Yazd, Imam Street was chosen as an area for the CFD model, since the north-eastern end of this street leads to a vacant area which makes defining the boundary conditions straightforward. The CFD model is simulated for this city. The simulation with FLUENT software requires a computing domain and meshes that are generated using the Gambit software. The initial and boundary conditions should be determined in order to provide a numerical solution of partial differential equations. The inlet mass and wall boundary conditions are used for pollutant removing from linear source and at the boundaries where the fluid is enclosed by a solid. According to the results, the boundary conditions were obtained from the simulation of the WRF model. At first, the airflow was simulated by the WRF model near the surface without considering urban canopy. Then the pollution dispersion in the street canyon and around the build-up was simulated with high resolution by the FLUENT software in three dimensions. In this study, a meteorological parameter such as wind speed has been investigated. The WRF model was executed on the 12th of January 2015 at 8 am, and the FLUENT model was coupled to calculate the flow field on the 13th of January 2015 at 9 am; there was a high-pressure system on this day in the area. The FLUENT model was tested using wind tunnel data. The results of Miao et al. (2013) and meteorological data have been used to validate the WRF model. Comparison of the coupled model results shows that the CFD model is required to determine the pollutant dispersion pattern from the linear source, and this pattern cannot be solely obtained from the wind blowing environment of the WRF model due to these patterns being influenced by various blowing environment speeds and directions, the effect of buildings on each other, vortices, and other factors. The two-phase mixture model is used for two-phase flow in the FLUENT software in this paper. The k-ε RNG turbulence model is used for turbulence. The effect of geometric parameters such as the longitude of the street, and of meteorological parameters such as wind speed, has been investigated. The pollutant dispersion pattern from the linear source is influenced by the speeds and various directions of the blowing environment in the build-up area, and cannot be solely obtained by using WRF model. Therefore, the use of the CFD model is required in this simulation. Results: In summary, the results of this study suggest that the pairing of the WRF-CFD model can be considered as an important tool to study and predict the urban flow and dispersions in dense, built-up areas.

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APA: Copy

MEMARIAN, M.H., & HATAMI, SH.. (2018). Simulating Urban Flow and Dispersion of Air Pollution Using FLUENT and WRF Models (Case Study of Imam Khomeini Street in Yazd. JOURNAL OF METEOROLOGY AND ATMOSPHERIC SCIENCES (JMAS), 1(1 ), 13-24. SID. https://sid.ir/paper/268653/en

Vancouver: Copy

MEMARIAN M.H., HATAMI SH.. Simulating Urban Flow and Dispersion of Air Pollution Using FLUENT and WRF Models (Case Study of Imam Khomeini Street in Yazd. JOURNAL OF METEOROLOGY AND ATMOSPHERIC SCIENCES (JMAS)[Internet]. 2018;1(1 ):13-24. Available from: https://sid.ir/paper/268653/en

IEEE: Copy

M.H. MEMARIAN, and SH. HATAMI, “Simulating Urban Flow and Dispersion of Air Pollution Using FLUENT and WRF Models (Case Study of Imam Khomeini Street in Yazd,” JOURNAL OF METEOROLOGY AND ATMOSPHERIC SCIENCES (JMAS), vol. 1, no. 1 , pp. 13–24, 2018, [Online]. Available: https://sid.ir/paper/268653/en

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