Results 141 to 150 of about 615 (185)

Numerical investigation of the influence of topography on simulated downburst wind fields

Journal of Wind Engineering and Industrial Aerodynamics, 2010
A, dry, non-hydrostatic sub-cloud model is used to simulate an isolated stationary downburst wind event to study the influence topographic features have on the near-ground wind structure of these storms.
Matthew S Mason, David F Fletcher
exaly   +2 more sources

Empirical models for predicting unsteady-state downburst wind speeds

Journal of Wind Engineering and Industrial Aerodynamics, 2014
Data source: Supplementary data, http://www.sciencedirect.com/science/article/pii/S0167610514000622?via%3DihubRecent reports of failures of transmission line systems in several regions around the world point to downburst events rather than other types of
El-Sayed Abd-Elaal, Julie E Mills, Xing Ma   +2 more
exaly   +2 more sources

Downburst-producing thunderstorms in southern Germany: Radar analysis and predictability

Atmospheric Research, 2009
Three days with downburst-producing thunderstorms during the VERTIKATOR intensive observation period in June and July 2002 are studied by means of the C-band polarisation diversity radar POLDIRAD and its network of three bistatic receivers.We present the
Nikolai Dotzek, Katja Friedrich
exaly   +2 more sources

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Control of an aircraft in downbursts

Journal of Guidance, Control, and Dynamics, 1990
Guidance schemes are designed to approximate the optimal survival and optimal performance paths through downbursts, which were determined in the previous paper. Specifically, climb-rate command following is used to achieve performance, and altitude command following is used to enhance survivability.
Yiyuan Zhao, A. E. Bryson
openaire   +1 more source

Numerical and analytical simulation of downburst wind loads [PDF]

Engineering Structures, 2006
Researchers and designers currently have a number of methods for numerically simulating either the non-turbulent or turbulent characteristics of downbursts.
Faris Albermani
exaly   +2 more sources

Approach guidance in a downburst

Journal of Guidance, Control, and Dynamics, 1992
We present a nonlinear feedback law for safe aircraft penetration through downbursts on landing approach. It is based on following a nominal approach path relative to the ground, subject to a minimum airspeed constraint. The guidance design uses a point-mass aircraft model and considers the flight path to be in the vertical plane.
Yiyuan Zhao, A. E. Bryson
openaire   +1 more source

Grid Validations for Downburst Simulations

Applied Mechanics and Materials, 2012
Downbursts, which resulted from the flow downdraft in thunderstorms, have become one of the most destructive disasters to buildings including transmission towers, etc. This disaster has drawn researchers’ interests and progresses have been continuously made by employing test and numerical tools.
Hui Xue Dang, Feng Li Yang, Jing Bo Yang
openaire   +1 more source

Forecasting of Tornadoes and Downbursts

2020
Abstract Tornadoes and downbursts cause extreme wind speeds that often present a threat to human safety, structures, and the environment. While the accuracy of weather forecasts has increased manifold over the past several decades, the current numerical weather prediction models are still not capable of explicitly resolving tornadoes and
openaire   +1 more source

Takeoff and landing in a downburst

Journal of Aircraft, 1987
Investigations into landing and takeoff in a downburst are made with a simple wind model based on the flow toward a flat plate. Approaches along a given nominal glide path are analyzed. The influence of the changing wind on the aircraft's demand for energy is calculated. The results are given in energy height errors. Computer simulations of an aircraft
openaire   +1 more source

Model of the wind field in a downburst

Journal of Aircraft, 1985
The downburst weather phenomenon produces a flow like that of a jet directed vertically downward at the ground. The resulting velocity field near the ground has been modeled as a classical ideal fluid flow generated by a suitable singularity distribution. The resulting model of horizontal, lateral, and vertical winds near the ground is quite realistic,
Shangxiang Zhu, Bernard Etkin
openaire   +1 more source