Volume 46, Number 2, April II 1999
|Page(s)||177 - 182|
|Section||Electromagnetism, optics, acoustic, heat transfer, classical mechanics, and fluid dynamics|
|Published online||01 September 2002|
Relative dispersion in fully developed turbulence: Lagrangian statistics in synthetic flows
Dipartimento di Fisica Generale, Università di Torino
Via P. Giuria 1, 10125 Torino, Italy
2 Istituto di Cosmogeofisica - c. Fiume 4, 10133 Torino, Italy
3 Istituto Nazionale di Fisica della Materia - Unità di Torino Università, Italy
4 DIAS, Politecnico di Torino - Corso Duca degli Abruzzi 24, 10129 Torino, Italy
5 Dipartimento di Fisica, Università "La Sapienza” P.le Aldo Moro 2, 00185 Roma, Italy
6 Istituto Nazionale di Fisica della Materia - Unità di Roma I, Italy
Accepted: 27 January 1999
The effect of Eulerian intermittency on the Lagrangian statistics of relative dispersion in fully developed turbulence is investigated. A scaling range spanning many decades is achieved by generating a multi-affine synthetic velocity field with prescribed intermittency features. The scaling laws for the Lagrangian statistics are found to depend on intermittency in agreement with a multifractal description. As a consequence of the Kolmogorov law, the Richardson law for the variance of pair separation is not affected by intermittency corrections.
PACS: 47.27.Qb – Turbulent diffusion / 47.27.Gs – Isotropic turbulence; homogeneous turbulence / 47.27.Eq – Turbulence simulation and modeling
© EDP Sciences, 1999
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