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

Abstract

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.