| Project/Area Number |
26350467
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Social systems engineering/Safety system
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| Research Institution | National Institute of Maritime, Port and Aviation Technology |
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Principal Investigator |
OKA HIDEYUKI 国立研究開発法人海上・港湾・航空技術研究所, その他部局等, 研究員 (80399518)
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| Co-Investigator(Kenkyū-buntansha) |
岡 泰資 横浜国立大学, 大学院環境情報研究院, 准教授 (10240764)
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| Project Period (FY) |
2014-04-01 – 2017-03-31
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| Project Status |
Completed (Fiscal Year 2016)
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| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2015: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2014: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
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| Keywords | 浅層モデル / 高密度ガス / 大気拡散 / 大気拡散モデル / 高密度ガス大気拡散モデル / 数値解析 / 数値計算法 / 環境影響評価 |
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| Outline of Final Research Achievements |
This study is concerned with computer models for atmospheric dispersion of denser-than-air gas. In particular, we focus on a shallow-layer approach based on shallow water equations out of three types of modeling approaches. One of available computer codes based on a shallow-layer model, Twodee-2 (Folch, et al., 2009), is employed to evaluate and improve this model. This code can deal with heavy gas dispersion phenomena induced by surrounding airflow. However, it has been confirmed that it does not work in the simulation of a heavy gas current under its own weight on a sloping terrain. Therefore, a discretization scheme for advection terms of model equations is modified to a simple, second-order upwind scheme. In addition, an air entrainment model is modified to take account of the heavy gas flow velocity instead of the surrounding airflow. As a result, it has been found that numerical results by this modified Twodee-2 code can nicely reproduce wind tunnel experimental data.
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