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Published March 1989 | Published
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Study of the origin of three dimensional structures and chaos in an externally forced free shear layer


Experiments on an externally forced free shear layer are performed which study the origin of three-dimensional structures and chaos in shear flows. Transition routes between the laminar two-dimensional stages of shear flows and their final complex three-dimensional stages are examined. Two avenues of investigation are pursued. First, the general idea of a multi-frequency route to chaos is examined which treats the shear flow as an open dynamical system. An attempt is made to apply concepts from nonlinear dynamics to these systems. Secondly, a new approach to generating three-dimensional structures in shear flows which involves the creation of a spatial shear in the frequency of external perturbations is presented. In these experiments, a variety of vortex reconnection behaviors is observed at the discontinuity.

Additional Information

© 1989 by K. Williams-Stuber and M. Gharib. Published by the American Institute of Aeronautics and Astronautics, Inc. with permission. The work presented here was sponsored by AFOSR under contract number AFOSR-87-0330.

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Published - Gharib_1989p89-1021.pdf


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