Wind and Structures

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Effects of aspect ratio on laboratory simulation of tornado-like vortices

  • Tang, Zhuo (National Wind Institute, Texas Tech University) ;
  • Zuo, Delong (National Wind Institute, Texas Tech University) ;
  • James, Darryl (Department of Mechanical Engineering, Texas Tech University) ;
  • Eguch, Yuzuru (Fluid Dynamics Sector, Civil Engineering Research Laboratory, Central Research Institute of Electric Power Industry) ;
  • Hattori, Yasuo (Fluid Dynamics Sector, Civil Engineering Research Laboratory, Central Research Institute of Electric Power Industry)
  • Received : 2018.04.12
  • Accepted : 2018.07.09
  • Published : 2018.08.25
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Abstract

Experiments were conducted in a large-scale Ward-type tornado simulator to study tornado-like vortices. Both flow velocities and the pressures at the surface beneath the vortices were measured. An interpretation of these measurements enabled an assessment of the mean flow field as well as the mean and fluctuating characteristics of the surface pressure deficit, which is a manifestation of the flow fluctuation aloft. An emphasis was placed on the effect of the aspect ratio of the tornado simulator on the characteristics of the simulated flow and the corresponding surface pressure deficit, especially the evolution of these characteristics due to the transition of the flow from a single-celled vortex to a two-celled vortex with increasing swirl ratio.

Keywords

Acknowledgement

Supported by : National Science Foundation

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