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Numerical Study on the Improvement of a Heavy Gas Dispersion Model Based on a Shallow Layer Approarch

Research Project

Project/Area Number 26350467
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Social systems engineering/Safety system
Research InstitutionNational Institute of Maritime, Port and Aviation Technology

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)

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)
Project Period (FY) 2014-04-01 – 2017-03-31
Project Status Completed (Fiscal Year 2016)
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)
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
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.

Report

(4 results)
  • 2016 Annual Research Report   Final Research Report ( PDF )
  • 2015 Research-status Report
  • 2014 Research-status Report

Research Products

(7 results)

All 2016 2015 2014

All Presentation (7 results)

  • [Presentation] 浅層モデルに基づく高密度ガス大気拡散モデルの評価2016

    • Author(s)
      岡 秀行,日向 賢也,岡 泰資
    • Organizer
      第86回マリンエンジニアリング学術講演会講演論文集,pp.163-164.
    • Place of Presentation
      姫路商工会議所
    • Year and Date
      2016-10-24
    • Related Report
      2016 Annual Research Report
  • [Presentation] 浅層モデルに基づく高密度ガスの拡散予測モデルの改良とその評価2016

    • Author(s)
      日向 賢也,岡 秀行,岡 泰資
    • Organizer
      安全工学シンポジウム2016講演予稿集,pp.316-319.
    • Place of Presentation
      日本学術会議(東京)
    • Year and Date
      2016-07-07
    • Related Report
      2016 Annual Research Report
  • [Presentation] 浅層モデルに基づく高密度ガスの拡散予測モデルの改良とその評価2016

    • Author(s)
      日向賢也,岡秀行,岡泰資
    • Organizer
      安全工学シンポジウム2016
    • Place of Presentation
      日本学術会議
    • Year and Date
      2016-07-07
    • Related Report
      2015 Research-status Report
  • [Presentation] 海上輸送事故に伴う可燃性液体の漏えい・火災影響評価に関する検討2015

    • Author(s)
      木村新太,岡秀行
    • Organizer
      日本船舶海洋工学会平成27年秋季講演会
    • Place of Presentation
      東京大学生産技術研究所
    • Year and Date
      2015-11-16
    • Related Report
      2015 Research-status Report
  • [Presentation] 液化天然ガスの大気拡散簡易評価モデルの予測精度に関する研究2015

    • Author(s)
      木村新太,岡秀行,岡 泰資
    • Organizer
      安全工学シンポジウム2015
    • Place of Presentation
      日本学術会議
    • Year and Date
      2015-07-02 – 2015-07-03
    • Related Report
      2014 Research-status Report
  • [Presentation] 液化天然ガスの海上流出に伴う大気拡散予測コード精度比較2015

    • Author(s)
      木村新太,岡秀行,岡泰資
    • Organizer
      安全工学シンポジウム2015
    • Place of Presentation
      日本学術会議
    • Year and Date
      2015-07-02
    • Related Report
      2015 Research-status Report
  • [Presentation] 可燃性液体の洋上漏えいによる被害影響度評価に関する研究2014

    • Author(s)
      木村新太,岡秀行
    • Organizer
      化学工学会第46回秋季大会講演要旨集
    • Place of Presentation
      九州大学伊都キャンパス
    • Year and Date
      2014-09-17 – 2014-09-19
    • Related Report
      2014 Research-status Report

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Published: 2014-04-04   Modified: 2018-03-22  

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