Tsallis extended thermodynamics applied to 2-d turbulence Lévy statistics and q-fractional generalized kraichnanian energy and enstrophy spectra

Egolf, Peter William (Haute école d’ingénierie et de gestion du canton de Vaud (HEIG-VD) HES-SO // Haute Ecole Spécialisée de Suisse Occidentale) ; Hutter, Kolumban (Laboratory of Hydraulics, Hydrology and Glaciology, Swiss Federal Institute of Technology, ETH)

The extended thermodynamics of Tsallis is reviewed in detail and applied to turbulence. It is based on a generalization of the exponential and logarithmic functions with a parameter q. By applying this nonequilibrium thermodynamics, the Boltzmann-Gibbs thermodynamic approach of Kraichnan to 2-d turbulence is generalized. This physical modeling implies fractional calculus methods, obeying anomalous diffusion, described by Lévy statistics with q < 5/3 (sub diffusion), q = 5/3 (normal or Brownian diffusion) and q > 5/3 (super diffusion). The generalized energy spectrum of Kraichnan, occurring at small wave numbers k, now reveals the more general and precise result k−q. This corresponds well for q = 5/3 with the Kolmogorov-Oboukov energy spectrum and for q > 5/3 to turbulence with intermittency. The enstrophy spectrum, occurring at large wave numbers k, leads to a k−3q power law, suggesting that large wave-number eddies are in thermodynamic equilibrium, which is characterized by q = 1, finally resulting in Kraichnan’s correct k −3 enstrophy spectrum. The theory reveals in a natural manner a generalized temperature of turbulence, which in the non-equilibrium energy transfer domain decreases with wave number and shows an energy equipartition law with a constant generalized temperature in the equilibrium enstrophy transfer domain. The article contains numerous new results; some are stated in form of eight new (proven) propositions.


Note: This article belongs to the Special Issue Phenomenological Thermodynamics of Irreversible Processes


Mots-clés:
Type d'article:
scientifique
Faculté:
Ingénierie et Architecture
Ecole:
HEIG-VD Haute Ecole d’Ingénierie et de Gestion du Canton de Vaud
Institut:
IGT - Institut de Génie Thermique
Classification:
Ingénierie
Date:
2018
Pagination:
41 pages
Publié dans
Entropy
Numérotation (vol. no.):
2018, 20(2), 109
DOI:
ISSN:
1099-4300
Le document apparaît dans:



 Notice créée le 2018-04-24, modifiée le 2018-08-19

Fichiers:
Télécharger le document
PDF

Évaluer ce document:

Rate this document:
1
2
3
 
(Pas encore évalué)