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Condensed Matter > Statistical Mechanics

arXiv:cond-mat/0306005 (cond-mat)
[Submitted on 31 May 2003]

Title:Lagrangian Vorticity and Velocity Measurements in Turbulent Jets

Authors:C. Poulain, N. Mazellier, P. Gervais, Y. Gagne, C. Baudet
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Abstract: We report an experimental investigation of various statistical properties of the spatial Fourier modes of the vorticity field in turbulent jets for a large range of Reynolds numbers ($530 \leq R_{\lambda} \leq 6100$). The continuous time evolution of a spatial Fourier mode of the vorticity distribution, characterized by a well defined wave-vector, is obtained from acoustic scattering measurements. The spatial enstrophy spectrum, as a function of the spatial wave-vector, is determined by scanning the incoming sound frequencies. Time-frequency analysis of the turbulent vorticity fluctuations is also performed for different length scales of the flows. Vorticity time-correlations show that the characteristic time of a Fourier mode behaves as the sweeping time. Finally, we report preliminary Lagrangian velocity measurements obtained using acoustic scattering by soap bubbles inflated with helium. Gathering a very large number ($\geq 13~10^{6}$) of passages of isolated bubbles in the scattering volume, one is able to compute the Lagrangian velocity PDF and velocity spectrum. Despite the spatial filtering due to the finite size of the bubble, the latter exhibits a power law with the -2 exponent predicted by the Komogorov theory, over one decade of frequencies.
Comments: Latex, 32 pages, 14 figures
Subjects: Statistical Mechanics (cond-mat.stat-mech); Disordered Systems and Neural Networks (cond-mat.dis-nn); Chaotic Dynamics (nlin.CD); Fluid Dynamics (physics.flu-dyn)
Cite as: arXiv:cond-mat/0306005 [cond-mat.stat-mech]
  (or arXiv:cond-mat/0306005v1 [cond-mat.stat-mech] for this version)
  https://doi.org/10.48550/arXiv.cond-mat/0306005

Submission history

From: Christophe Baudet [view email]
[v1] Sat, 31 May 2003 11:32:09 UTC (254 KB)
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