Co-host: The Institute of Electrical Engineering of Japan, Japanese Society of Steel Construction, Japan Society of Civil Engineers, Meteorlological Society of Japan, Architectural Institute of Japan, Japan Association for Wind Engineering
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We experimentally examined the velocity field around a moving tornado near the surface by using hotwire anemometers with an array of four X-probes and dynamic PIV system. The resultant mean distribution obtained by the PIV showed an asymmetric pattern in which the maximum velocity was appeared in right rear side of the counterclockwise tornado to the moving direction. The tornado became stronger and inclined forward as the moving velocity increased. Therefore, the tornado may be stretched continuously, and intensified through the 'vortex stretching' mechanism. The velocity change accompanied by the passage of the moving tornado was also measured at fixed points.
