On the properties of steady states in turbulent axisymmetric flows

Details On the properties of steady states in turbulent axisymmetric flows On the properties of steady states in turbulent axisymmetric flows

2006-01-25

arxiv.org/abs/cond-mat/0601582v1

Physics

Condensed Matter

Statistical Mechanics

latex prl-stationary-051215arxiv.tex, 9 files, 6 figures, 4 pages (http://www-drecam.cea.fr/spec/articles/S06/008/)

Scientific paper

10.1103/PhysRevLett.96.124502

We experimentally study the properties of mean and most probable velocity fields in a turbulent von K\'arm\'an flow. These fields are found to be described by two families of functions, as predicted by a recent statistical mechanics study of 3D axisymmetric flows. We show that these functions depend on the viscosity and on the forcing. Furthermore, when the Reynolds number is increased, we exhibit a tendency for Beltramization of the flow, i.e. a velocity-vorticity alignment. This result provides a first experimental evidence of nonlinearity depletion in non-homogeneous non-isotropic turbulent flow.

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