The 3D structure of the Lagrangian acceleration in turbulent flows

Details The 3D structure of the Lagrangian acceleration in turbulent flows The 3D structure of the Lagrangian acceleration in turbulent flows

2004-10-12

arxiv.org/abs/physics/0410070v1

Physics

Fluid Dynamics

accepted for publication in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.93.214501

We report experimental results on the three dimensional Lagrangian acceleration in highly turbulent flows. Tracer particles are tracked optically using four silicon strip detectors from high energy physics that provide high temporal and spatial resolution. The components of the acceleration are shown to be statistically dependent. The probability density function (PDF) of the acceleration magnitude is comparable to a log-normal distribution. Assuming isotropy, a log-normal distribution of the magnitude can account for the observed dependency of the components. The time dynamics of the acceleration components is found to be typical of the dissipation scales whereas the magnitude evolves over longer times, possibly close to the integral time scale.

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