2008/05/15 by J. Seiwert, C. Morize, F. Moisy · 4 citations
Engineering · Physics and Astronomy · #Astrophysics and Star Formation Studies #Fluid Dynamics and Turbulent Flows #Solar and Space Plasma Dynamics #physics.flu-dyn
paper · pdf · doi:10.1063/1.2949313
published as Phys. Fluids 20, 071702 (2008). · 5 pages, 5 figures. In revision for Phys. Fluids Letters
arxiv created 2008/05/15 · openalex publication_date 2008/07/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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.