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The structure of the vorticity field in turbulent channel flow. Part 1. Analysis of instantaneous fields and statistical correlations

Published online by Cambridge University Press:  20 April 2006

Parviz Moin  and
John Kim
Parviz Moin
Affiliation:
NASA Ames Research Center, Moffett Field, California 94035
John Kim
Affiliation:
NASA Ames Research Center, Moffett Field, California 94035
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Abstract

An investigation into the existence of hairpin vortices in turbulent channel flow is conducted using a database generated by the large-eddy simulation technique. It is shown that away from the wall the distribution of the inclination angle of vorticity vector gains its maximum at about 45° to the wall. Two-point correlations of velocity and vorticity fluctuations strongly support a flow model consisting of vortical structures inclined at 45° to the wall. The instantaneous vorticity vectors plotted in planes inclined at 45° show that the flow contains an appreciable number of hairpins. Vortex lines are used to display the three-dimensional structure of hairpins, which are shown to be generated from deformation (or roll-up) of sheets of transverse vorticity.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 155 , June 1985 , pp. 441 - 464
Copyright
© 1985 Cambridge University Press

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