Matches in SemOpenAlex for { <https://semopenalex.org/work/W2114533090> ?p ?o ?g. }
- W2114533090 abstract "This review article addresses the dynamics and control of low-frequency unsteadiness, as observed in some aerodynamic applications. It presents a coherent and rigorous linearized approach, which enables both to describe the dynamics of commonly encountered open-flows and to design open-loop and closed-loop control strategies, in view of suppressing or delaying instabilities. The approach is global in the sense that both cross-stream and streamwise directions are discretized in the evolution operator. New light will therefore be shed on the streamwise properties of open-flows. In the case of oscillator flows, the unsteadiness is due to the existence of unstable global modes, i.e., unstable eigenfunctions of the linearized Navier–Stokes operator. The influence of nonlinearities on the dynamics is studied by deriving nonlinear amplitude equations, which accurately describe the dynamics of the flow in the vicinity of the bifurcation threshold. These equations also enable us to analyze the mean flow induced by the nonlinearities as well as the stability properties of this flow. The open-loop control of unsteadiness is then studied by a sensitivity analysis of the eigenvalues with respect to base-flow modifications. With this approach, we manage to a priori identify regions of the flow where a small control cylinder suppresses unsteadiness. Then, a closed-loop control approach was implemented for the case of an unstable open-cavity flow. We have combined model reduction techniques and optimal control theory to stabilize the unstable eigenvalues. Various reduced-order-models based on global modes, proper orthogonal decomposition modes, and balanced modes were tested and evaluated according to their ability to reproduce the input-output behavior between the actuator and the sensor. Finally, we consider the case of noise-amplifiers, such as boundary-layer flows and jets, which are stable when viewed in a global framework. The importance of the singular value decomposition of the global resolvent will be highlighted in order to understand the frequency selection process in such flows." @default.
- W2114533090 created "2016-06-24" @default.
- W2114533090 creator A5001309476 @default.
- W2114533090 creator A5005674562 @default.
- W2114533090 creator A5028378587 @default.
- W2114533090 creator A5089784233 @default.
- W2114533090 date "2010-04-27" @default.
- W2114533090 modified "2023-09-30" @default.
- W2114533090 title "Dynamics and Control of Global Instabilities in Open-Flows: A Linearized Approach" @default.
- W2114533090 cites W1489339159 @default.
- W2114533090 cites W1551480811 @default.
- W2114533090 cites W1633869374 @default.
- W2114533090 cites W1741033055 @default.
- W2114533090 cites W182983404 @default.
- W2114533090 cites W1965118954 @default.
- W2114533090 cites W1966736542 @default.
- W2114533090 cites W1967374729 @default.
- W2114533090 cites W1967778821 @default.
- W2114533090 cites W1968452503 @default.
- W2114533090 cites W1968724784 @default.
- W2114533090 cites W1971697991 @default.
- W2114533090 cites W1971698683 @default.
- W2114533090 cites W1973771223 @default.
- W2114533090 cites W1974025710 @default.
- W2114533090 cites W1975461388 @default.
- W2114533090 cites W1975781390 @default.
- W2114533090 cites W1976948936 @default.
- W2114533090 cites W1977940131 @default.
- W2114533090 cites W1978158089 @default.
- W2114533090 cites W1978790133 @default.
- W2114533090 cites W1979885389 @default.
- W2114533090 cites W1980431326 @default.
- W2114533090 cites W1981515050 @default.
- W2114533090 cites W1984067177 @default.
- W2114533090 cites W1987253153 @default.
- W2114533090 cites W1988808219 @default.
- W2114533090 cites W1989159570 @default.
- W2114533090 cites W1991546931 @default.
- W2114533090 cites W1991584799 @default.
- W2114533090 cites W1994235001 @default.
- W2114533090 cites W1994251552 @default.
- W2114533090 cites W1995732523 @default.
- W2114533090 cites W1997232851 @default.
- W2114533090 cites W1997439597 @default.
- W2114533090 cites W1998215253 @default.
- W2114533090 cites W1999009083 @default.
- W2114533090 cites W2009494515 @default.
- W2114533090 cites W2013409077 @default.
- W2114533090 cites W2013559776 @default.
- W2114533090 cites W2016112736 @default.
- W2114533090 cites W2016215406 @default.
- W2114533090 cites W2017926718 @default.
- W2114533090 cites W2017944985 @default.
- W2114533090 cites W2019333894 @default.
- W2114533090 cites W2021127833 @default.
- W2114533090 cites W2021263469 @default.
- W2114533090 cites W2021482067 @default.
- W2114533090 cites W2023430368 @default.
- W2114533090 cites W2026918888 @default.
- W2114533090 cites W2029903585 @default.
- W2114533090 cites W2030677092 @default.
- W2114533090 cites W2031401862 @default.
- W2114533090 cites W2034661879 @default.
- W2114533090 cites W2034959718 @default.
- W2114533090 cites W2035694657 @default.
- W2114533090 cites W2036199851 @default.
- W2114533090 cites W2036434567 @default.
- W2114533090 cites W2036561943 @default.
- W2114533090 cites W2037039802 @default.
- W2114533090 cites W2038516800 @default.
- W2114533090 cites W2040865558 @default.
- W2114533090 cites W2040982803 @default.
- W2114533090 cites W2041979270 @default.
- W2114533090 cites W2048918629 @default.
- W2114533090 cites W2049537509 @default.
- W2114533090 cites W2054334783 @default.
- W2114533090 cites W2057576183 @default.
- W2114533090 cites W2059316647 @default.
- W2114533090 cites W2059863569 @default.
- W2114533090 cites W2060518745 @default.
- W2114533090 cites W2062081423 @default.
- W2114533090 cites W2062856798 @default.
- W2114533090 cites W2062988356 @default.
- W2114533090 cites W2064733273 @default.
- W2114533090 cites W2066454569 @default.
- W2114533090 cites W2066816316 @default.
- W2114533090 cites W2068527334 @default.
- W2114533090 cites W2069700902 @default.
- W2114533090 cites W2070299075 @default.
- W2114533090 cites W2071633407 @default.
- W2114533090 cites W2072140080 @default.
- W2114533090 cites W2076158602 @default.
- W2114533090 cites W2077714198 @default.
- W2114533090 cites W2079572610 @default.
- W2114533090 cites W2080641281 @default.
- W2114533090 cites W2082923923 @default.
- W2114533090 cites W2088919146 @default.
- W2114533090 cites W2098077093 @default.
- W2114533090 cites W2098807191 @default.
- W2114533090 cites W2101610188 @default.