Adaptive and model-based control theory applied to convectively unstable flows
2014 (English)In: Applied Mechanics Review, ISSN 0003-6900, E-ISSN 1088-8535, Vol. 66, no 6, 060801- p.Article, review/survey (Refereed) Published
Research on active control for the delay of laminar-turbulent transition in boundary layers has made a significant progress in the last two decades, but the employed strategies have been many and dispersed. Using one framework, we review model-based techniques, such as linear-quadratic regulators, and model-free adaptive methods, such as least-mean square filters. The former are supported by a elegant and powerful theoretical basis, whereas the latter may provide a more practical approach in the presence of complex disturbance envi- ronments, that are difficult to model. We compare the methods with a particu- lar focus on efficiency, practicability and robustness to uncertainties. Each step is exemplified on the one-dimensional linearized Kuramoto-Sivashinsky equa- tion, that shows many similarities with the initial linear stages of the transition process of the flow over a flat plate. Also, the source code for the examples are provided.
Place, publisher, year, edition, pages
2014. Vol. 66, no 6, 060801- p.
Flow control, Control theory, Optimal control, Adaptive control, Boundary-layer flow, Fluid dynamics
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-154050DOI: 10.1115/1.4027483ISI: 000346238700001ScopusID: 2-s2.0-84902832513OAI: oai:DiVA.org:kth-154050DiVA: diva2:754897
FunderSwedish Research Council, 2012- 4246
MATLAB scrips available at www.mech.kth.se/~nicolo/ks2014-10-132014-10-132016-05-17Bibliographically approved