| Issue |
Europhys. Lett.
Volume 66, Number 2, April 2004
|
|
|---|---|---|
| Page(s) | 219 - 225 | |
| Section | Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics | |
| DOI | https://doi.org/10.1209/epl/i2003-10187-x | |
| Published online | 01 April 2004 | |
Dispersion of tracer particles in a compressible flow
1
Department of Physics and Astronomy, University of Pittsburgh Pittsburgh, PA 15260, USA
2
Fachbereich Physik, Philipps-Universität - D-35032 Marburg, Germany
Received:
12
November
2003
Accepted:
5
February
2004
The turbulent diffusion of Lagrangian tracer particles has been
studied in a flow on the surface of a large tank of water and in
computer simulations. The effect of flow compressibility is
captured in images of particle fields. The velocity field of
floating particles has a divergence, whose probability density
function shows exponential tails. Also studied is the motion of
pairs and triplets of particles. The mean-square separation
is fitted to the scaling form
, and in contrast
with the Richardson-Kolmogorov prediction, an extended range with
a reduced scaling exponent of 
is found.
Clustering is also manifest in strongly deformed triangles
spanned within triplets of tracers.
PACS: 47.27.Gs – Isotropic turbulence; homogeneous turbulence / 47.27.Qb – Turbulent diffusion / 06.30.Gv – Velocity, acceleration, and rotation
© EDP Sciences, 2004
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