Torque Fluctuations In The Framework Of A Multifractal 23/9-Dimensional Turbulence Model

The Science of Making Torque from Wind 2012

Fitton, G.^1 ; Tchiguirinskaia, I.^1 ; Schertzer, D.^1 ; Lovejoy, S.^2

Université Paris Est, Ecole des Ponts ParisTech, LEESU, 6-8 avenue B. Pascal, Cité Descartes, Marne-la-Vallée

77455, France^1

McGill University, Physics Department, 3600 University street, Montreal

QC, Canada^2

关键词: Horizontal winds;    In-depth analysis;    Multifractality;    Statistical moments;    Three parameters;    Torque fluctuation;    Wind velocities;    Wind velocity field;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/555/1/012038/pdf
DOI  :  10.1088/1742-6596/555/1/012038

来源: IOP

【 摘 要 】

We have carried out in-depth analyses of boundary-layer wind velocity data within a universal multifractal (UM) framework. Within the UM framework the statistics of a given field are characterised with the help of the three parameters α, C1and H. With these three parameters one fully describes the wind velocity fields up to and including the order qDafter which the divergence of statistical moments intervenes. Studies at different sites have shown that the parameter α-the multifractality index-of the horizontal and vertical shears of the horizontal wind remains fairly constant at approximately 1.7. In this study we show how the two remaining parameters C1and H vary for two very different sites/datasets and discuss what the consequences of this variability are for the fluctuations of the torque.