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자료유형
학술저널
저자정보
저널정보
한국기상학회 Asia-Pacific Journal of Atmospheric Sciences 한국기상학회지 제41권 제5호
발행연도
2005.10
수록면
733 - 749 (17page)

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A three-dimensional computational fluid dynamics (CFD) model with the renormalization group (RNG) k-ε turbulence model is used to simulate flow and passive scalar (e.g., pollutants) dispersion in a central business district of Seoul. A particular emphasis is put on the effects of ambient wind direction on flow and pollutant dispersion. For this, three cases with different ambient wind directions (easterly, southeasterly, and northeasterly) are considered. It is shown that the configuration of buildings largely determines wind speed and direction inside and above urban street canyons. Especially, the decrease in wind speed is obviously seen around building-congested areas. In wide streets such as Jongno, Cheonggyecheonno, and Euljiro, a main wind is easterly irrespective of the ambient wind directions. Wind speed decreases as going to the central region of the model domain. Relatively strong horseshoe vortices are observed in front of high-rise buildings and wind is strong around the buildings. During a period of pollutant emission, the maximum pollutant concentration appears in recirculation zones behind buildings close to the emission source location. This is because the escape of pollutants is not easy once pollutants are trapped in the recirculation zones. After pollutant emission ceases, the location of the maximum pollutant concentration is shifted downwind. Pollutants are transported downwind mainly by mean flow and dispersed laterally by turbulent diffusion. Lateral dispersion of pollutants is found to be large near an area where high-rise buildings are densely located. This is because building-generated turbulence is strong there.

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Abstract
1. 서론
2. 수치 모형
3. 표준 및 RNG k-ε 난류 모형 비교
4. 수치 실험 설계
5. 결과 및 토의
6. 요약 및 결론
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