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KMID : 0364920140390020070
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Journal of Radiation Protection and Research
2014 Volume.39 No. 2 p.70 ~ p.80
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A Numerical Study for the Air Flow on Complex Terrain
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Park Mi-Sun
Jeong Hae-Sun
Jeong Hyo-Joon
Hwang Won-Tae
Kim Eun-Han
Han Moon-Hee
Kim Hey-Suk
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Abstract
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The interpretation on the diffusion of radiation contaminants in air is usually to apply a Gaussian plume equationthat obtains normal distributions in stable air flow conditions to draw a conservative conclusion. In this study, a numericalstudy using computational fluid dynamics methods was performed to interpret the air flow pattern and the diffusion of theradiation contaminants at the Wolseong nuclear power plants, and a more detailed solution can be obtained than the Gaussianplume equation, which is difficult to use to simulate complex terrains. The results show that a significant fluctuation of airflow in the terrain appears in the case of a northwester and southeaster because of the mountain located in the northwestand the sea located in the south-east. The northwesterly air flow shows the most unstable flow in the vertical direction whenit passes over the terrain of mountain. The stable southeasterly air flow enters into the nuclear power plant from the sea,but it becomes unstable rapidly because of the interference by the building and the terrain. On the other hand, in the caseof a northeaster and southwester, a small interruption of air flow is caused by the terrain and wake behind the buildingsof nuclear power plants.
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KEYWORD
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Computational fluid dynamics(CFD), Atmospheric diffusion, Air flow
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