Developing homogeneous isotropic turbulence

PHYSICA D-NONLINEAR PHENOMENA

卷:241

Article

Bos, Wouter J. T.³  Connaughton, Colm^1,2  Godeferd, Fabien³ 

[1] Univ Warwick, Inst Math, Coventry CV4 7AL, W Midlands, England

[2] Univ Warwick, Ctr Complex Sci, Coventry CV4 7AL, W Midlands, England

[3] Univ Lyon, Lab Mecan Fluides & Acoust, CNRS UMR 5509, Ecole Cent Lyon, Lyon, France

关键词: Homogeneous isotropic turbulence;    EDQNM model;    Transient dynamics;    Self-similarity;   

DOI  :  10.1016/j.physd.2011.02.005

来源: Elsevier

【 摘 要 】

We investigate the self-similar evolution of the transient energy spectrum, which precedes the establishment of the Kolmogorov spectrum in homogeneous isotropic turbulence in three dimensions using the EDQNM closure model. The transient evolution exhibits self-similarity of the second kind and has a non-trivial dynamical scaling exponent, which results in the transient spectrum having a scaling that is steeper than the Kolmogorov k(-5/3) spectrum. Attempts to detect a similar phenomenon in DNS data are inconclusive, owing to the limited range of scales available. (C) 2011 Elsevier B.V. All rights reserved.

【 授权许可】

Free