Dispersion of tracer particles in a compressible flow
arXiv:nlin/0402031 · doi:10.1209/epl/i2003-10187-x
Abstract
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 <Delta(t)^2> is fitted to the scaling form <Delta(t)^2> ~ t^alpha, and in contrast with the Richardson-Kolmogorov prediction, an extended range with a reduced scaling exponent of alpha=1.65 pm 0.1 is found. Clustering is also manifest in strongly deformed triangles spanned within triplets of tracers.
6 pages, 4 figures
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Cited by in corpus (8)
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- Population genetics in compressible flows
- On the Aggregation of Inertial Particles in Random Flows
- Population dynamics in compressible flows
- Test particle energization of heavy ions in magnetohydrodynamic turbulence
- Solution of the Stochastic Langevin Equations for Clustering of Particles in Turbulent Flows in Terms of Wiener Path Integral
- Intermittency and non-universality of pair dispersion in isothermal compressible turbulence