Observation of Vortex Packets in Direct Numerical Simulation of Fully Turbulent Channel Flow

Article type: Research Article

Authors: Adrian, R.J. | Liu, Z.C.

Affiliations: Laboratory for Turbulence and Complex Flow, Department of Theoretical and Applied Mechanics, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.

Abstract: A number of experimental studies have inferred the existence of packets of inclined, hairpin-like vortices in wall turbulence on the basis of observations made in two-dimensional x-y planes using visualization and particle image velocimetry (PIV). However, there are very few observations of hairpins in existing three-dimensional studies made using direct numerical simulation (DNS), and no such study claims to have revealed packets. We demonstrate, for the first time, the existence of hairpin vortex packets in DNS of turbulent flow. The vortex packet structure found in the present study at low Reynolds number, Re_ = 300, is consistent with and substantiates the observations and the results from two-dimensional PIV measurements at higher Reynolds numbers in channel, pipe and boundary layer flows. Thus, the evidence supports the view that vortex packets are a universal feature of wall turbulence, independent of effects due to boundary layer trips or critical conditions in the aforementioned numerical studies. Visualization of the DNS velocity field and vortices also shows the close association of hairpin packets with long low-momentum streaks and the regions of high Reynolds shear stress.

Keywords: wall turbulence, wall eddies, structure, hairpin vortices, hairpin vortex packets, direct numerical simulation

Journal: Journal of Visualization, vol. 5, no. 1, pp. 9-19, 2002