Wind and Structures

  • 제11권4호
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  • Pages.291-302
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  • 2008
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  • 1226-6116(pISSN)
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  • 1598-6225(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Swirl ratio effects on tornado vortices in relation to the Fujita scale

  • Hangan, H. (Alan G. Davenport Wind Engineering Group, The Boundary Layer Wind Tunnel Laboratory, The University of Western Ontario, Faculty of Engineering) ;
  • Kim, J.D. (Alan G. Davenport Wind Engineering Group, The Boundary Layer Wind Tunnel Laboratory, The University of Western Ontario, Faculty of Engineering)
  • 투고 : 2007.10.01
  • 심사 : 2008.06.18
  • 발행 : 2008.08.25
⟨ 이전 논문 다음 논문 ⟩

초록

Three-dimensional engineering simulations of momentum-driven tornado-like vortices are conducted to investigate the flow dynamics dependency on swirl ratio and the possible relation with real tornado Fujita scales. Numerical results are benchmarked against the laboratory experimental results of Baker (1981) for a fixed swirl ratio: S = 0.28. The simulations are then extended for higher swirl ratios up to S = 2 and the variation of the velocity and pressure flow fields are observed. The flow evolves from the formation of a laminar vortex at low swirl ratio to turbulent vortex breakdown, followed by the vortex touch down at higher swirls. The high swirl ratios results are further matched with full scale data from the Spencer, South Dakota F4 tornado of May 30, 1998 (Sarkar, et al. 2005) and approximate velocity and length scales are determined.

키워드

참고문헌

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