Results 121 to 130 of about 172 (152)

A unified theory of formation of downbursts and tornadoes

Journal of Wind Engineering and Industrial Aerodynamics, 1990
Abstract A unified theory of the formation of downbursts and tornadoes is formulated that all such natural hazards are caused by the temporal interaction of a cyclone vortex at mid-level with the surface of the earth. The theory is demonstrated numerically by obtaining time-dependent solutions for the Navier-Stokes equations in an initially ...
C.T. Hsu, E. Uzal
openaire   +1 more source

Numerical Simulation of Downburst Wind Loads

2009 International Conference on Management and Service Science, 2009
Wind hazard is the one which has the widespread influence in the nature disaster. Transmission towers have experienced a number of failures due to downburst wind events in recent years, with devastating economical and social consequences. Based on the mechanism of downburst wind load, the present paper proposes an AR model method of adding turbulence ...
Jinwen Wang, Wei-lian Qu
openaire   +1 more source

Experimental Simulation Of Downburst Lines: A Particle Image Velocimetry Study Of Downburst Collisions

Progress in Canadian Mechanical Engineering. Volume 4, 2021
Kyle Graat, Shivani Jariwala, Eric Savory   +2 more
openaire   +1 more source

Physical and numerical modelling of thunderstorm downbursts

Journal of Wind Engineering and Industrial Aerodynamics, 2001
Abstract In this study, a static continuous impinging jet has been used to simulate a thunderstorm downburst. Velocity characteristics have been investigated at various positions in the flow over flat terrain, and over simple topographic features, thereby yielding topographical speed-up factors. A generic empirical equation describing the development
Wood, Graeme S., Kwok, Kenny C. S., Motteram, Nicholas A., Fletcher, David   +3 more
openaire   +2 more sources

Leonardo da Vinci and the Downburst

Bulletin of the American Meteorological Society, 1990
Abstract Evidence from the drawings, experiments, and writings of Leonardo da Vinci are presented to demonstrate that da Vinci recognized and, possibly, discovered the downburst and understood its associated airflow. Other early references to vortex flows resembling downbursts are mentioned.
openaire   +1 more source

Experimental Investigation of Downbursts in a Crossflow

AIAA Scitech 2021 Forum, 2021
Skyler Jacob, Garrett Clay, Jandreau Jackson, Jamey D. Jacob   +3 more
openaire   +1 more source

Feedback control for penetrating a downburst

Guidance, Navigation and Control Conference, 1987
Feedback logic is given that produces satisfactory penetration of an aircraft through a severe downburst. The logic has two parts: (1) A switch that calls for full throttle and tight climb-rate-hold feedback logic when the magnitude of headwind-rate exceeds a threshold level; this switch stays on until re-set by the pilot after penetration of the ...
openaire   +1 more source

DOWNBURSTS: Meteorological features and wind field characteristics

Journal of Wind Engineering and Industrial Aerodynamics, 1990
Abstract Since the term “downburst” was coined by the author back in 1976, it has been subclassified into “microburst” and “macroburst” according to the horizontal dimension of the wind system. Introduced in this paper is the basic observational evidence of the microburst investigated by three fact-finding projects in 1978, 1982, and 1986, at three ...
openaire   +1 more source

downburst, n.

2023
openaire   +1 more source

Extensible catenary approach in analyzing transmission line’s conductors under downbursts

Engineering Structures, 2021
Ahmed Shehata, Ashraf El Damatty
exaly