Advances in output feedback control of transient energy growth in a linearized channel flow

Huaijin Yao, Maziar S Hemati

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Transient energy growth (TEG) is a primary mechanism for bypass transition in many wall-bounded shear flows. Here, we investigate the efficacy of reducing TEG in a linearized channel flow with feedback controllers that use wall shear-stress sensors and wall-normal blowing/suction actuators. Owing to established performance limitations of observer-based controller designs within the context of TEG, we study static output feedback linear quadratic regulation (SOF-LQR) strategies for control. SOF-LQR is found to outperform optimal observer-based feedback designs, and to reduce TEG of spanwise disturbances relative to the uncontrolled flow. We further show that by introducing an appropriate set of additional observables, SOF-LQR controllers can reduce TEG associated with streamwise and oblique disturbances as well. In fact, we show that by selecting a small number of appropriate observables, SOF-LQR controllers can fully recover full-state LQR performance.

Original languageEnglish (US)
Title of host publicationAIAA Scitech 2019 Forum
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
ISBN (Print)9781624105784
DOIs
StatePublished - Jan 1 2019
EventAIAA Scitech Forum, 2019 - San Diego, United States
Duration: Jan 7 2019Jan 11 2019

Publication series

NameAIAA Scitech 2019 Forum

Conference

ConferenceAIAA Scitech Forum, 2019
CountryUnited States
CitySan Diego
Period1/7/191/11/19

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Yao, H., & Hemati, M. S. (2019). Advances in output feedback control of transient energy growth in a linearized channel flow. In AIAA Scitech 2019 Forum (AIAA Scitech 2019 Forum). American Institute of Aeronautics and Astronautics Inc, AIAA. https://doi.org/10.2514/6.2019-0882