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Article information
2018 , Volume 23, ¹ 5, p.63-69
Krutova I.Y.
Tables of geometric, high-speed and energy characteristics for the bottom parts of a tornado
The natural phenomenon of a tornado, known for its destructive power, is an object of study of many scientists. The available part of the data of field observations of this natural phenomenon is systematized and collected in the so-called Fujita scale. In particular, it indicates the width of the fracture band for tornadoes of different intensity, and only the values of the maximum wind speed are given from the gas dynamic parameters. Bautin S.P. proposed and justified the scheme of occurrence and functioning of natural ascending swirling flows of the tornado and tropical cyclones. Based on both this scheme and the data of the Fujita scale, the external radii of air inflow in the near-bottom parts of tornadoes of various intensities are established and the gas dynamic parameters of these flows are calculated. It turned out that in the case of the lowest intensity from the Fujita scale, the kinetic energy of the rotational motion of the air is half of the entire kinetic energy of the flow in the bottom part. As tornado intensity increases, the kinetic energy of rotational motion becomes the more prominent part of the total kinetic energy of the flow. In this paper, given the Fujita value of the width of the destruction zone for all tornadoes along with the two external radii of air inflow into the bottom part of the tornado are established as r i n1 and r i n2. The first of these radii, namely r i n1, denotes the radius at which the kinetic energy of the rotational motion of the constructed stream is half of all the kinetic energy of this stream. The second one denoted as r i n2, is the radius at which the kinetic energy of the entire stream becomes equal to the kinetic energy of the weakest destructive tornado. Knowing the values of these radii allows reliable predicting the origin of the tornado.
[full text]
Keywords: system of equations of gas dynamics, Fujita scale, kinetic energy, inflow radius
doi: 10.25743/ICT.2018.23.5.006
Author(s):
Krutova Irina Yuryevna
PhD.
Position: Head of Chair
Office: Snezhinsk Physical and Technical Institute National Research Nuclear University MEPhI
Address: 456776, Russia, Snezhinsk, str. Komsomolskaya, 8
Phone Office: (35146) 9-24-19
E-mail: IYKrutova@mephi.ru
SPIN-code: 5487-1414 References:
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[4] Bautin, S.P., Deryabin, S.L., Krutova, I.Y., Obuhov, A.G. Razrushitel'nye atmosfernye vikhri i vrashchenie Zemli vokrug svoey osi [Destructive atmospheric vortices and the Earth’s rotation around its axis]. Ekaterinburg: UrGUPS; 2017: 335. (In Russ.)
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[7] Krutova, I.Yu. Calculations of gas-dynamic parameters in the bottom part of tornado. ComputationalTechnologies. 2017; 22(1):17–24. (In Russ.)
[8] Bautin, S.P. Kharakteristicheskaya zadacha Koshi i ee prilozheniya v gazovoy dinamike [The characteristic Cauchy problem and its application in gas dynamics]. Novosibirsk: Nauka; 2009: 368. (In Russ.)
Bibliography link:
Krutova I.Y. Tables of geometric, high-speed and energy characteristics for the bottom parts of a tornado // Computational technologies. 2018. V. 23. ¹ 5. P. 63-69
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