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Real-Time Adaptive Control of Mixing in a Plane Shear Layer
Final rept. 15 Jan 1990-14 Jul 1993
ILLINOIS UNIV CHAMPAIGN
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Work was conducted on two projects related to real-time control of shear flows. In the first, two-dimensional unsteady simulations of the development of the wake behind a circular cylinder impulsively started into rotatory and rectilinear motion were performed. This simulation code is now serving as a testbed for the development of open- and closed-loop strategies for control of the liftdrag ratio as well as the suppression of vortex shedding. The code has been checked by comparison to earlier computational and experimental work. In the second project, a technique was developed to extract both velocity components in a two-dimensional incompressible flow from measurements of a single scalar temperature or concentration, and all three velocity components in a three-dimensional incompressible flow from measurements of two scalars. The technique is applicable to steady or unsteady, laminar or turbulent flows. A key advantage over particle image velocimetry and other multi-point techniques is that our method uses full-field optical measurements, so that spatial resolution is not limited by particle size and loading restrictions.
APPROVED FOR PUBLIC RELEASE