Experimental Lagrangian structure functions in turbulence

Lagrangian properties obtained from a Particle Tracking Velocimetry experiment in a turbulent flow at intermediate Reynolds number are presented. Accurate sampling of particle trajectories is essential in order to obtain the Lagrangian structure functions and to measure intermittency at small tempor...

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Bibliographic Details
Published in:arXiv.org 2009-05
Main Authors: Berg, Jacob, Ott, Soren, Mann, Jakob, Luthi, Beat
Format: Article
Language:English
Subjects:
Balances (scales)
Computational fluid dynamics
Fluid flow
Intermittency
Particle tracking
Particle tracking velocimetry
Particle trajectories
Reynolds number
Turbulence
Turbulent flow
Velocity measurement
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Summary:Lagrangian properties obtained from a Particle Tracking Velocimetry experiment in a turbulent flow at intermediate Reynolds number are presented. Accurate sampling of particle trajectories is essential in order to obtain the Lagrangian structure functions and to measure intermittency at small temporal scales. The finiteness of the measurement volume can bias the results significantly. We present a robust way to overcome this obstacle. Despite no fully developed inertial range we observe strong intermittency at the scale of dissipation. The multifractal model is only partially able to reproduce the results.
ISSN:2331-8422
DOI:10.48550/arxiv.0903.2633