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

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 en...

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Veröffentlicht in:	Physical review letters 2003-03, Vol.90 (10), p.104501-104501, Article 104501
Hauptverfasser:	Portelli, B, Holdsworth, P C W, Pinton, J-F
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Sprache:	eng
Schlagworte:	Condensed Matter Physics Statistical Mechanics
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creator	Portelli, B Holdsworth, P C W Pinton, J-F
description	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.
doi_str_mv	10.1103/physrevlett.90.104501
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title	Intermittency and non-Gaussian fluctuations of the global energy transfer in fully developed turbulence
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