Skin-friction Drag ReductionViaRobust Reduced-order Linear Feedback Control
- 1 November 1998
- journal article
- research article
- Published by Taylor & Francis in International Journal of Computational Fluid Dynamics
- Vol. 11 (1-2) , 79-92
- https://doi.org/10.1080/10618569808940866
Abstract
A successful application of a linear controller to a two-dimensional channel flow is presented. An optimal and robust reduced-order linear feedback controller is derived by using multi-variable linear-quadratic-Gaussian synthesis, or, in modern term, H2 synthesis, combined with model reduction techniques. This controller based on a reduced-model of the linearized Navier-Stokes equations is applied to suppress finite-amplitude near-wall disturbances in a channel flow at Re = 1500. The controller efficiently reduced near-wall disturbances obtaining a substantial drag reduction and eventually the flow is relaminarizedKeywords
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