Physical simulation of a single-celled tornado-like vortex, Part A: Flow field characterization

Amit R. Mishra; Darryl L. James; Chris W. Letchford

doi:10.1016/j.jweia.2008.02.063

Physical simulation of a single-celled tornado-like vortex, Part A: Flow field characterization

Amit R. Mishra, Darryl L. James, Chris W. Letchford

Research output: Contribution to journal › Article › peer-review

60 Scopus citations

Abstract

Tornado vortex simulation is described and a new simulator is presented. Radial, tangential, and vertical velocity measurements together with surface static pressure measurements are presented and compared with available data from the Manchester and Spencer, South Dakota tornadoes of May 30, 1998, and June 24, 2003, respectively. Comparisons of the surface pressure profile and tangential velocity decay showed good agreement with the TTU simulation. Analytically, the simulated velocity decay is found to be similar to that of a modified Rankine combined vortex with a variable exponent that changed with height. The simulator is demonstrated as a viable device for determining wind loading on building models in tornado-like vortex flows, and such results are presented in Part B.

Original language	English
Pages (from-to)	1243-1257
Number of pages	15
Journal	Journal of Wind Engineering and Industrial Aerodynamics
Volume	96
Issue number	8-9
DOIs	https://doi.org/10.1016/j.jweia.2008.02.063
State	Published - Aug 2008

Keywords

Modified combined Rankine vortex
Physical tornado simulation
Swirl ratio
Tornado-like vortex

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10.1016/j.jweia.2008.02.063

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title = "Physical simulation of a single-celled tornado-like vortex, Part A: Flow field characterization",

abstract = "Tornado vortex simulation is described and a new simulator is presented. Radial, tangential, and vertical velocity measurements together with surface static pressure measurements are presented and compared with available data from the Manchester and Spencer, South Dakota tornadoes of May 30, 1998, and June 24, 2003, respectively. Comparisons of the surface pressure profile and tangential velocity decay showed good agreement with the TTU simulation. Analytically, the simulated velocity decay is found to be similar to that of a modified Rankine combined vortex with a variable exponent that changed with height. The simulator is demonstrated as a viable device for determining wind loading on building models in tornado-like vortex flows, and such results are presented in Part B.",

keywords = "Modified combined Rankine vortex, Physical tornado simulation, Swirl ratio, Tornado-like vortex",

author = "Mishra, {Amit R.} and James, {Darryl L.} and Letchford, {Chris W.}",

year = "2008",

month = aug,

doi = "10.1016/j.jweia.2008.02.063",

language = "English",

volume = "96",

pages = "1243--1257",

journal = "Journal of Wind Engineering and Industrial Aerodynamics",

issn = "0167-6105",

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T1 - Physical simulation of a single-celled tornado-like vortex, Part A

T2 - Flow field characterization

AU - Mishra, Amit R.

AU - James, Darryl L.

AU - Letchford, Chris W.

PY - 2008/8

Y1 - 2008/8

N2 - Tornado vortex simulation is described and a new simulator is presented. Radial, tangential, and vertical velocity measurements together with surface static pressure measurements are presented and compared with available data from the Manchester and Spencer, South Dakota tornadoes of May 30, 1998, and June 24, 2003, respectively. Comparisons of the surface pressure profile and tangential velocity decay showed good agreement with the TTU simulation. Analytically, the simulated velocity decay is found to be similar to that of a modified Rankine combined vortex with a variable exponent that changed with height. The simulator is demonstrated as a viable device for determining wind loading on building models in tornado-like vortex flows, and such results are presented in Part B.

AB - Tornado vortex simulation is described and a new simulator is presented. Radial, tangential, and vertical velocity measurements together with surface static pressure measurements are presented and compared with available data from the Manchester and Spencer, South Dakota tornadoes of May 30, 1998, and June 24, 2003, respectively. Comparisons of the surface pressure profile and tangential velocity decay showed good agreement with the TTU simulation. Analytically, the simulated velocity decay is found to be similar to that of a modified Rankine combined vortex with a variable exponent that changed with height. The simulator is demonstrated as a viable device for determining wind loading on building models in tornado-like vortex flows, and such results are presented in Part B.

KW - Modified combined Rankine vortex

KW - Physical tornado simulation

KW - Swirl ratio

KW - Tornado-like vortex

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JO - Journal of Wind Engineering and Industrial Aerodynamics

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