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Microburst simulation via vortex-rin...

Wan, Tung.

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Microburst simulation via vortex-ring and turbulent jet models.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Microburst simulation via vortex-ring and turbulent jet models./
作者:	Wan, Tung.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 1988,
面頁冊數:	123 p.
附註:	Source: Dissertations Abstracts International, Volume: 50-10, Section: B.
Contained By:	Dissertations Abstracts International50-10B.
標題:	Aerospace materials. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=8901077

Microburst simulation via vortex-ring and turbulent jet models.
Wan, Tung.

Microburst simulation via vortex-ring and turbulent jet models. - Ann Arbor : ProQuest Dissertations & Theses, 1988 - 123 p.

Source: Dissertations Abstracts International, Volume: 50-10, Section: B.

Thesis (Ph.D.)--The University of Texas at Arlington, 1988.

This item must not be sold to any third party vendors.

Microbursts, suggested as primary causes of many aircraft fatal crashes, are the subject of this research. A microburst, or low-level intense wind shear, is generated by a thunderstorm or a small rain cloud, and presents hazardous conditions for aircraft during take-off and landing maneuvers. Recently released data show that a microburst resembles a transient vortex ring. Three microburst models have been constructed in this study. First, the turbulent jet model encompasses a free jet at high altitude and a wall jet near the ground surface. Second, the vortex ring model is a combination of a primary and an image vortex ring, with an inviscid-viscous interaction at the central axial and surface regions. An unsteady version of this model is also provided by solving the trajectory equation with the Direct Formal Integration (DFI) method or with the Runge-Kutta method. Third and finally, the complete unsteady microburst model equations (conservation of mass, momentum, and energy), or what has been referred to as the Navier-Stokes model formulation, are solved by the successive over relaxation method. Results show that the microburst can be simulated accurately by impulsive turbulent jet at high altitude and a transient vortex ring in mid-air and near the ground surface. In addition to improved understanding of the physical nature of microbursts, the models presented here can also be used for flight simulation and the pilot training purposes.Subjects--Topical Terms:

3433227
Aerospace materials.

Microburst simulation via vortex-ring and turbulent jet models.
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100 1 $a Wan, Tung. $3 3435275
245 1 0 $a Microburst simulation via vortex-ring and turbulent jet models.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 1988
300 $a 123 p.
500 $a Source: Dissertations Abstracts International, Volume: 50-10, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Payne, Fred R.
502 $a Thesis (Ph.D.)--The University of Texas at Arlington, 1988.
506 $a This item must not be sold to any third party vendors.
506 $a This item must not be added to any third party search indexes.
520 $a Microbursts, suggested as primary causes of many aircraft fatal crashes, are the subject of this research. A microburst, or low-level intense wind shear, is generated by a thunderstorm or a small rain cloud, and presents hazardous conditions for aircraft during take-off and landing maneuvers. Recently released data show that a microburst resembles a transient vortex ring. Three microburst models have been constructed in this study. First, the turbulent jet model encompasses a free jet at high altitude and a wall jet near the ground surface. Second, the vortex ring model is a combination of a primary and an image vortex ring, with an inviscid-viscous interaction at the central axial and surface regions. An unsteady version of this model is also provided by solving the trajectory equation with the Direct Formal Integration (DFI) method or with the Runge-Kutta method. Third and finally, the complete unsteady microburst model equations (conservation of mass, momentum, and energy), or what has been referred to as the Navier-Stokes model formulation, are solved by the successive over relaxation method. Results show that the microburst can be simulated accurately by impulsive turbulent jet at high altitude and a transient vortex ring in mid-air and near the ground surface. In addition to improved understanding of the physical nature of microbursts, the models presented here can also be used for flight simulation and the pilot training purposes.
590 $a School code: 2502.
650 4 $a Aerospace materials. $3 3433227
650 4 $a Atmosphere. $3 542821
690 $a 0538
690 $a 0608
710 2 $a The University of Texas at Arlington. $3 1025869
773 0 $t Dissertations Abstracts International $g 50-10B.
790 $a 2502
791 $a Ph.D.
792 $a 1988
793 $a English
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