Intermittency and non-Gaussian fluctuations of the global energy transfer in fully developed turbulence - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review Letters Année : 2003

Intermittency and non-Gaussian fluctuations of the global energy transfer in fully developed turbulence

Résumé

We address the experimentally observed non-Gaussian fluctuations for the energy injected into a closed turbulent flow at fixed Reynolds number. We propose that the power fluctuations mirror the internal kinetic energy fluctuations. Using a stochastic cascade model, we construct the excess kinetic energy as the sum over the energy transfers at different levels of the cascade. We find an asymmetric distribution that strongly resembles the experimental data. The asymmetry is an explicit consequence of intermittency and the global measure is dominated by small scale events correlated over the entire system. Our calculation is consistent with the statistical analogy recently made between a confined turbulent flow and a critical system of finite size.

Dates et versions

hal-00134666 , version 1 (04-03-2007)

Identifiants

Citer

Baptiste Portelli, Peter C.W. Holdsworth, Jean-François Pinton. Intermittency and non-Gaussian fluctuations of the global energy transfer in fully developed turbulence. Physical Review Letters, 2003, 90, pp.104501. ⟨hal-00134666⟩
34 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More