竜巻状流れ場における飛散物の挙動  [in Japanese] Behavior of Flying Debris in Tornado-like Flow  [in Japanese]

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Author(s)

    • 野田 稔 NODA Minoru
    • 徳島大学大学院ソシオテクノサイエンス研究部 Institute of Technology and Science, The University of Tokushima
    • 政井 仁 MASAI Kazuhito
    • 徳島大学大学院先端技術科学教育部 Graduate School of Advanced Technology and Science, The University of Tokushima
    • 長尾 文明 NAGAO Fumiaki
    • 徳島大学大学院ソシオテクノサイエンス研究部 Institute of Technology and Science, The University of Tokushima

Abstract

Tornado visualized by funnel cloud and flying debris, is sometimes recorded as photographs and movies. Some researchers have tried to estimate the wind speed of tornado. In order to estimate the wind speed from the motion of flying debris, the characteristics of flying debris in tornado must be clarified. In this paper, the trajectories of flying debris in tornado-like flow with some different parameters, such as scale, swirl ratio and strength, are investigated by 6 DOF motion simulation of 3D flying debris. As results of this study, it is found that debris cloud is inevitably formed in tornado-like flow and this phenomenon can be explained by the equilibrium of aerodynamic forces, centrifugal force and gravity in radius-height plane. Moreover, it was clarified that the motion of flying debris in tornado is controlled by the Tachikawa number, Fluid number and Swirl ratio.

Journal

  • Journal of Wind Engineering

    Journal of Wind Engineering (136), 63-73, 2013-07-31

    Japan Association for Wind Engineering

References:  20

Codes

  • NII Article ID (NAID)
    10031191297
  • NII NACSIS-CAT ID (NCID)
    AA11491599
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    13493507
  • NDL Article ID
    024822242
  • NDL Call No.
    Z16-B243
  • DOI
    10.5359/jwe.38.63
  • Data Source
    CJP  NDL  J-STAGE 
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