Volume 66, Number 2, April 2004
|Page(s)||219 - 225|
|Section||Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics|
|Published online||01 April 2004|
Dispersion of tracer particles in a compressible flow
Department of Physics and Astronomy, University of Pittsburgh Pittsburgh, PA 15260, USA
2 Fachbereich Physik, Philipps-Universität - D-35032 Marburg, Germany
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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.