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Dispersion of tracer particles in a compressible flow | | John R. Cressman
; Walter I. Goldburg
; Joerg Schumacher
; | | Date: |
19 Feb 2004 | | Journal: | Europhys. Lett. 66 (2004) 219 | | Subject: | Chaotic Dynamics; Fluid Dynamics | nlin.CD physics.flu-dyn | | 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 is fitted to the scaling form ~ 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. | | Source: | arXiv, nlin.CD/0402031 | | Services: | Forum | Review | PDF | Favorites | |
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