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On the vorticity dynamics of a turbulent jet in a crossflow

Published online by Cambridge University Press:  21 April 2006

R. I. Sykes ,
W. S. Lewellen  and
S. F. Parker
R. I. Sykes
Affiliation:
Aeronautical Research Associates of Princeton, Inc., P.O. Box 2229, 50 Washington Road, Princeton, New Jersey 08540
W. S. Lewellen
Affiliation:
Aeronautical Research Associates of Princeton, Inc., P.O. Box 2229, 50 Washington Road, Princeton, New Jersey 08540
S. F. Parker
Affiliation:
Aeronautical Research Associates of Princeton, Inc., P.O. Box 2229, 50 Washington Road, Princeton, New Jersey 08540
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Abstract

We present numerical solutions of the fully three-dimensional flow of a round, turbulent jet emitted normal to a uniform free stream. Comparisons with available laboratory data and comparison between different numerical grid resolutions are used to demonstrate the quality of the simulation. Examination of the detailed flow pattern within a computational domain, which extends 15 jet diameters from the source allows us to follow the vorticity dynamics in the transition from an initially vertical jet to a wake with a vortex pair essentially aligned with the free stream. The transition is presented as a function of the ratio of the jet exit velocity to free stream velocity. For large velocity ratios, the source of the streamwise vorticity in the vortex pair can be readily traced back to the original streamwise vorticity in the sides of the vertical jet.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 168 , July 1986 , pp. 393 - 413
Copyright
© 1986 Cambridge University Press

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