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Wind and Structures   Volume 10, Number 2, March 2007, pages 135-151
DOI: https://doi.org/10.12989/was.2007.10.2.135
 
An investigation of the structure of ensemble averaged extreme wind events
A. Scarabino, M. Sterling, P. J. Richards and C. J. Baker and R. P. Hoxey

 
Abstract     [Buy Article]
    This paper examines the extreme gust profiles obtained by conditionally sampling full-scale velocity data obtained in the lower part of the atmospheric boundary layer. It is demonstrated that three different types of behaviour can be observed in the streamwise component of velocity. In all cases the corresponding vertical velocity component illustrates similar behaviour. An idealised horseshoe vortex model and a downburst model are investigated to examine if such structures can explain the behaviour observed. In addition, an empirical model is developed for an isolated gust corresponding to each of the three types of behaviour observed. It is possible that the division of the gust profile into three different types may lead to an improvement in the correlation of extreme gust events with respect to type.
 
Key Words
    gust shapes; conditional sampling; ensemble averaging; downbursts; hairpin vortex structures.
 
Address
A. Scarabino; Departamento Aeronautica, Universidad Nacional de La Plata, Calle 116 e/ 47 y 48, 1900 La Plata, Argentina
M. Sterling; School of Engineering, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
P. J. Richards; School of Engineering, University of Auckland, New Zealand
C. J. Baker and R. P. Hoxey; School of Engineering, The University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
 

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