Numerical Study of Tornado-Like Flow

被引：0

作者：

Wang M. ^{[1
]}

Cao S. ^{[2
]}

Cao J. ^{[2
]}

机构：

[1] College of Civil Engineering, Tongji University, Shanghai

[2] State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, Shanghai

来源：

Tongji Daxue Xuebao/Journal of Tongji University | 2019年 / 47卷 / 11期

关键词：

Computational fluid dynamics(CFD); Flow structure; Large eddy simulation; Swirl ratio; Tornado;

D O I：

10.11908/j.issn.0253-374x.2019.11.003

中图分类号：

学科分类号：

摘要：

A numerical computational fluid dynamics (CFD) model to simulate tornado-like vortices was proposed. The tornado-generation mechanism was similar to that of the physical generator developed at Tongji University. The feasibility of this numerical model was verified by comparing the simulation results associated with tornado-like vortices with the experimental and field observation data. Furthermore, the three wind velocity components at tangential, radial and axial directions, wind pressures, vortex radii and turbulence characteristics of tornado-like vortices at three swirl ratios were investigated. The result shows that, with the increase of swirl ratio, the maximum tangential velocity and the radius of vortex core increase when the pressure and the standard deviation of tangential velocity around the tornado-like vortex center decrease. In addition, the single tornado-like vortex gradually breaks down and develops into a double-core structure. © 2019, Editorial Department of Journal of Tongji University. All right reserved.

引用

页码：1548 / 1556

页数：8

共 25 条

[1]

Cao S., Wang J., Statistical summary and case studies of strong wind damage in China, Journal of Disaster Research, 8, 6, (2013)

[2]

Xue M., Zhao K., Wang M., Et al., Recent significant tornadoes in China, Advances in Atmospheric Sciences, 33, 11, (2016)

[3]

Alexander C.R., Wurman J., The 30 May 1998 Spencer, South Dakota, Storm. Part I: The Structural Evolution and Environment of the tornadoes, Monthly Weather Review, 133, 1, (2005)

[4]

Le K., Haan F.L., Gallus W.A., Et al., CFD simulations of the flow field of a laboratory-simulated tornado for parameter sensitivity studies and comparison with field measurements, Wind & Structures an International Journal, 11, 2, (2008)

[5]

Ying S.J., Chang C.C., Exploratory model study of tornado-like vortex dynamics, Journal of the Atmospheric Sciences, 27, 1, (1970)

[6]

Ward N.B., The exploration of certain features of tornado dynamics using a laboratory model, Journal of the Atmospheric Sciences, 29, 6, (1972)

[7]

Church C.R., Snow J.T., Baker G.L., Et al., Characteristics of tornado-like vortices as a function of swirl ratio: a laboratory investigation, Journal of the Atmospheric Sciences, 36, 9, (1979)

[8]

Lund D.E., Snow J.T., Laser doppler velocimeter measurements in tornadolike vortices, Washington Dc American Geophysical Union Geophysical Monograph, 79, (1993)

[9]

Mishra A.R., James D.L., Letchford C.W., Physical simulation of a single-celled tornado-like vortex, part A: flow field characterization, Journal of Wind Engineering & Industrial Aerodynamics, 96, 8, (2008)

[10]

Mishra A.R., James D.L., Letchford C.W., Physical simulation of a single-celled tornado-like vortex, part B: wind loading on a cubical model, Journal of Wind Engineering & Industrial Aerodynamics, 96, 8, (2008)

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