Behavior of Flying Debris in Tornado-like Flow

• NODA Minoru

  Institute of Technology and Science, The University of Tokushima

• MASAI Kazuhito

  DAITETSU KOGYO CO.LTD.

• NINOMIYA Megumi

  TAKADA KIKO CO.LTD.

• NAGAO Fumiaki

  Institute of Technology and Science, The University of Tokushima

Bibliographic Information

Other Title

• 竜巻状流れ場における飛散物の挙動
• タツマキジョウ ナガレバ ニ オケル ヒサンブツ ノ キョドウ

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 38 (3), 63-73, 2013

  Japan Association for Wind Engineering

Keywords

• <I>Wind borne debris</I>
• <I>LES</I>
• <I>6DOF motion simulation</I>
• <I>Debris cloud</I>

Details

• CRID: 1390282680204205056
• NII Article ID: 10031191297
• NII Book ID: AN10072785
• ISSN: 09121935
• ISSN: 1349340X
• ISSN: 13493507
• DOI: 10.5359/jwe.38.63
• NDL BIB ID: 024822242
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I024822242
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed