Laboratory experiments for intense vortical structures in turbulence velocity fields

Details Laboratory experiments for intense vortical structures in turbulence velocity fields Laboratory experiments for intense vortical structures in turbulence velocity fields

2007-03-06

arxiv.org/abs/physics/0703057v1

PoF, 19, 055101 [2007]

Physics

Fluid Dynamics

8 pages, accepted by Physics of Fluids (see http://pof.aip.org/)

Scientific paper

10.1063/1.2720827

Vortical structures of turbulence, i.e., vortex tubes and sheets, are studied using one-dimensional velocity data obtained in laboratory experiments for duct flows and boundary layers at microscale Reynolds numbers from 332 to 1934. We study the mean velocity profile of intense vortical structures. The contribution from vortex tubes is dominant. The radius scales with the Kolmogorov length. The circulation velocity scales with the rms velocity fluctuation. We also study the spatial distribution of intense vortical structures. The distribution is self-similar over small scales and is random over large scales. Since these features are independent of the microscale Reynolds number and of the configuration for turbulence production, they appear to be universal.

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