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Article Dans Une Revue Physics of Fluids Année : 2008

On the decrease of intermittency in decaying rotating turbulence

Résumé

The scaling of the longitudinal velocity structure functions, Sq(r)=⟨∣δu(r)∣q⟩∼rζq, is analyzed up to order q=8 in a decaying rotating turbulence experiment from a large particle image velocimetry dataset. The exponent of the second order structure function ζ2 increases throughout the self-similar decay regime, up to the Ekman time scale. The normalized higher-order exponents ζq∕ζ2 are close to those of the intermittent nonrotating case at small times, but show a marked departure at larger times, on a time scale Ω−1 (Ω is the rotation rate), although a strictly nonintermittent linear law ζq∕ζ2=q∕2 is not reached.

Dates et versions

hal-04353066 , version 1 (19-12-2023)

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J. Seiwert, C. Morize, Frederic Moisy. On the decrease of intermittency in decaying rotating turbulence. Physics of Fluids, 2008, 20 (7), pp.071702. ⟨10.1063/1.2949313⟩. ⟨hal-04353066⟩
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