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The structure of the vorticity field in turbulent channel flow. Part 2. Study of ensemble-averaged fields

Published online by Cambridge University Press:  21 April 2006

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

Several conditional-sampling techniques are applied to data bases generated by large-eddy and direct numerical simulations. It is shown that the bursting process is associated with well-organized vortical structures inclined at about 45° to the wall. These vortical structures are identified by examining the vortex lines of three-dimensional instantaneous and ensemble-averaged vorticity fields. Two distinct horseshoe-shaped vortical structures corresponding to the sweep and ejection events are detected. These vortical structures are associated with high Reynolds shear stress and hence make a significant contribution to turbulent-energy production.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 162 , January 1986 , pp. 339 - 363
Copyright
© 1986 Cambridge University Press

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