Study of the Origin of Three Dimensional Structures in Shear Flows through External Forcing
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 25, 1990
- Accession Number
- ADA221923
Entities
People
- Kevin L. Williams
- M. Gharib
Organizations
- University of California, San Diego