On Distribution of Mean Tangential Wind Speed of Tornado-like Vortex

DOI Web Site 6 References Open Access
  • NODA Minoru
    Professor, Natural Science Cluster, Kochi University
  • HACHIYA Minoru
    OBAYASHI CORPORATION (At the time of a study: School of Advanced Technology and Science, Tokushima University)
  • MATSUURA Yuki
    AKANE Architectural Consultants Co., Ltd (At the time of a study: Faculty of Engineering, Tokushima University)
  • NAGAO Fumiaki
    Professor, Graduate School of Technology, Industrial and Social Sciences, Tokushima University

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Other Title
  • 竜巻状渦の平均接線風速分布について

Description

In this study, tornado-like flows under the horizontal shear flows whose types were one cell, two-cell, and multi-vortexes, were generated by Large Eddy Simulation with a real scale rectangular numerical field. As the results of investigation of the average tangential wind speed, it was found that Rankine’s vortex and Burgers-Rott vortex could not express the calculation results well. Therefore, assuming that the mean flow field was formed by the swaying vortex on the circle, the distribution of the mean tangential wind speed was calculated, and a new formula for the distribution of mean tangential wind speed was proposed. It was clarified that this proposed formula could fit to distributions of mean tangential wind speed for one cell, two-cell and multi-vortexes, very well.

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