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Abstract: The scaling of the longitudinal velocity structure functions, $S qr = < |\delta u r |^q > \sim r^{\zeta q}$, is analyzed up to order $q=8$ in adecaying rotating turbulence experiment from a large Particle Image VelocimetryPIV dataset. The exponent of the second-order structure function, $\zeta 2$,increases throughout the self-similar decay regime, up to the Ekman time scale.The normalized higher-order exponents, $\zeta q - \zeta 2$, are close to thoseof the intermittent non-rotating case at small times, but show a markeddeparture at larger times, on a time scale $\Omega^{-1}$ $\Omega$ is therotation rate, although a strictly non-intermittent linear law $\zeta q -\zeta 2 = q-2$ is not reached.



Autor: J. Seiwert, C. Morize, F. Moisy

Fuente: https://arxiv.org/







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