双胞龙卷风的分析模型,重点是影响上升气流的锐度参数,以及对外胞中碎片轨迹的讨论

IF 4.2 2区 工程技术 Q1 ENGINEERING, CIVIL
Sanjay Kumar Pandey, Shruti
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引用次数: 0

摘要

本模型是对 Baker 和 Sterling(2017 年)的单胞龙卷风模型的概括,引入了一个尖锐度参数。不过,我们只对外层细胞进行建模。这一想法源于 Vatistas 等人(1991 年)的模型,该模型表明,锐度参数值越大,最大方位角速度外围附近的方位角速度锐度就越大。这种概括带来了值得珍视的变化,有助于更好地拟合龙卷风运动。自然龙卷风可以适应不同的尖锐度参数值,这表明贝克和斯特林模型的局限性。流体被认为是牛顿、不可压缩和非粘性的,同时运动是稳定的。在两种情况下,即参数小于 1 和参数大于或等于 1 时,单细胞龙卷风和双细胞龙卷风的轴向速度分量表现不同。一个值得注意的现象是,最强的上升气流向最大径向速度的外围移动。此外,参考高度处的压力差径向剖面在双气室龙卷风中的表现也大不相同。此外,尖锐度参数会影响飞行碎片的飞行距离和下落碎片到达地面所需的时间。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
An analytical model of two-cell tornadoes with emphasis on sharpness parameter affecting updrafts and a discussion on debris trajectory in outer cell

The present model on two-cell tornadoes generalizes the one-cell model of Baker and Sterling (2017) by introducing a sharpness parameter. However, we model only the outer cell. The idea was derived from Vatistas et al. (1991) model which showed that larger values of the sharpness parameter increase the sharpness of azimuthal velocity near the periphery of maximum azimuthal velocity. This generalization brings about the cherished change, which helps better fit to tornado motion. Natural tornadoes can fit different values of the sharpness parameter, indicating the limitations of Baker and Sterling’s model. The fluid is considered Newtonian, incompressible, and non-viscous while the motion is steady. Major changes concerning the sharpness parameter are observed in the axial velocity component which behaves differently for one-cell and two-cell tornadoes in two cases, i.e., parameter less than one and parameter greater than or equal to one. A remarkable observation is that the strongest updraft shifts towards the periphery of the maximum radial velocity. Moreover, the radial profile of pressure difference at the reference height behaves quite differently for two-cell tornadoes. Furthermore, sharpness parameter affects the distance traveled by flying debris and the time taken by falling debris to reach the ground.

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来源期刊
CiteScore
8.90
自引率
22.90%
发文量
306
审稿时长
4.4 months
期刊介绍: The objective of the journal is to provide a means for the publication and interchange of information, on an international basis, on all those aspects of wind engineering that are included in the activities of the International Association for Wind Engineering http://www.iawe.org/. These are: social and economic impact of wind effects; wind characteristics and structure, local wind environments, wind loads and structural response, diffusion, pollutant dispersion and matter transport, wind effects on building heat loss and ventilation, wind effects on transport systems, aerodynamic aspects of wind energy generation, and codification of wind effects. Papers on these subjects describing full-scale measurements, wind-tunnel simulation studies, computational or theoretical methods are published, as well as papers dealing with the development of techniques and apparatus for wind engineering experiments.
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