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Published June 2003 | Submitted
Conference Paper Open

Inverse Technique for Vortex Imaging and Its Application to Feedback Flow Control

Abstract

A simple vortex imaging algorithm using a least square method is proposed for feedback flow control. The position and the circulation of a vortex convected in a channel are identified from the time history of pressure at a limited number of points on the wall. The capabilities of the algorithm are demonstrated using two-dimensional direct numerical simulations. A few observer points on one side of the wall are sufficient to detect the position and the circulation of a compact vortex to a reasonable degree of accuracy. This inverse algorithm is introduced to feedback separation control for a diffuser flow. The algorithm is modified for a curved channel, and the so-called "estimator-corrector" and "fast algorithm" are applied to reduce the uncertainty of prediction with less computational time. The DNS results demonstrate that the feedback control using the inverse technique can enhance the robustness against unsteady disturbances and lessen stagnation pressure loss.

Additional Information

© 2003 by Takao Suzuki, Tim Colonius, and Douglas G. MacMartin. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. Published Online: 25 Jun 2012. We appreciate Prof. Richard Murray for an idea of the estimator-corrector and Mr. Kazuo Sone for generating several files. The work on inverse algorithms described here was supported by DARPA (Defense Advanced Research Projects Agency) program (contract number F49620-00-C-0035).

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Submitted - SuzukiColoniusMacMartin2003.pdf

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Created:
August 19, 2023
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October 20, 2023