Vortex Tubes in Turbulence Velocity Fields at Reynolds Numbers 300-1300

Abstract

The most elementary structures of turbulence, i.e., vortex tubes, are studied using velocity data obtained in a laboratory experiment for boundary layers with microscale Reynolds numbers 295-1258. We conduct conditional averaging for enhancements of a small-scale velocity increment and obtain the typical velocity profile for vortex tubes. Their radii are of the order of the Kolmogorov length. Their circulation velocities are of the order of the root-mean-square velocity fluctuation. We also obtain the distribution of the interval between successive enhancements of the velocity increment as the measure of the spatial distribution of vortex tubes. They tend to cluster together below about the integral length and more significantly below about the Taylor microscale. These properties are independent of the Reynolds number and are hence expected to be universal.

arXiv comment8 pages, to appear in Physical Review E

References in corpus (4)

• Vortex tubes in velocity fields of laboratory isotropic turbulence: dependence on the Reynolds number
• Probability density function of turbulent velocity fluctuations in rough-wall boundary layer
• Vortex tubes in velocity fields of laboratory isotropic turbulence
• Wavelet Analysis of Vortex Tubes in Experimental Turbulence

Cited by in corpus (4)

• Vortex Identification from Local Properties of the Vorticity Field
• Laboratory experiments for intense vortical structures in turbulence velocity fields
• On Landau's prediction for large-scale fluctuation of turbulence energy dissipation
• Stochastic models of Lagrangian acceleration of fluid particle in developed turbulence