INVESTIGATION OF THE EFFECT OF MID-TUNNEL SHAFT GEOMETRY ON DISPERSION OF THE POLLUTANT IN ENVIRONMENT

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HEIDARINEJAD GHASSEM; SHOAEI MOZHDEH

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Journal: Modares Mechanical Engineering Year:2017 | Volume:17 | Issue:6 Page(s): 13-22

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Title

INVESTIGATION OF THE EFFECT OF MID-TUNNEL SHAFT GEOMETRY ON DISPERSION OF THE POLLUTANT IN ENVIRONMENT

Author(s)

HEIDARINEJAD GHASSEM | SHOAEI MOZHDEH | Issue Writer Certificate

Keywords

GEOMETRYQ1

MID-TUNNEL SHAFTQ1

NUMERICAL SIMULATIONQ2

POLLUTANTQ2

Abstract

In recent years, increased pollution and traffic in urban areas has caused the development of underground transport. One conventional approach for urban tunnel ventilation is construction of midtunnel shafts. These shafts are usually located in high-density urban areas and emissions from them can be harmful for the residents of adjacent buildings. The GEOMETRY of these shafts has been determined so far based on taste and only for the purpose of compliance standards criteria for tunnel indoor air. In this paper, POLLUTANT dispersion from different and conventional geometries of MID-TUNNEL SHAFTs with the assumption of a taller downstream building was investigated for the first time. The results can help to acheive a better design of these shafts and surrounding buildings to have healthier air for residents of buildings. For this purpose, simulations were done by Open FOAM. Reynolds-Averaged Navier-Stokes equations method and standard k-e model were used in simulations. The results showed for the same exhaust velocity, the effect of rectangular and square configuration on front wall depends on dimension of the side which is perpendicular to wind direction. For the exhaust velocity less than 6 m/s, the downstream building prevents POLLUTANTs from reaching higher altitude, and the amount of POLLUTANTs will be increased around 100 percent. Moreover, for exhaust velocity of more than 6 m/s, increasing velocity will cause fewer changes in POLLUTANT concentration at lower level. In addition, the results showed that exhaust velocity has more effect than GEOMETRY configuration on POLLUTANT dispersion and this influence will be decreased by increasing the velocity.

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APA: Copy

HEIDARINEJAD, GHASSEM, & SHOAEI, MOZHDEH. (2017). INVESTIGATION OF THE EFFECT OF MID-TUNNEL SHAFT GEOMETRY ON DISPERSION OF THE POLLUTANT IN ENVIRONMENT. MODARES MECHANICAL ENGINEERING, 17(6 ), 13-22. SID. https://sid.ir/paper/179242/en

Vancouver: Copy

HEIDARINEJAD GHASSEM, SHOAEI MOZHDEH. INVESTIGATION OF THE EFFECT OF MID-TUNNEL SHAFT GEOMETRY ON DISPERSION OF THE POLLUTANT IN ENVIRONMENT. MODARES MECHANICAL ENGINEERING[Internet]. 2017;17(6 ):13-22. Available from: https://sid.ir/paper/179242/en

IEEE: Copy

GHASSEM HEIDARINEJAD, and MOZHDEH SHOAEI, “INVESTIGATION OF THE EFFECT OF MID-TUNNEL SHAFT GEOMETRY ON DISPERSION OF THE POLLUTANT IN ENVIRONMENT,” MODARES MECHANICAL ENGINEERING, vol. 17, no. 6 , pp. 13–22, 2017, [Online]. Available: https://sid.ir/paper/179242/en

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