2019
DOI: 10.1017/jfm.2019.893
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Abstract: This work deals with the closed-loop control of streaky structures induced by free-stream turbulence (FST) in a zero-pressure gradient, transitional boundary layer, by means of localized sensors and actuators. A linear quadratic gaussian regulator is considered along with a system identification technique to build reduced-order models for control. Three actuators are developed with different spatial supports, corresponding to a baseline shape with only vertical forcing, and to two other shapes obtained by diff… Show more

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Cited by 21 publications
(31 citation statements)
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“…Moreover, reconstructions of flow fluctuations from a limited number of sensors are also possible using the resolvent operator (Towne et al 2020), which opens possibilities for closed-loop control of turbulent flows. As the lift-up effect studied here is also the basis of bypass transition in boundary layers (Andersson, Berggren & Henningson 1999;Brandt 2014), extension of control methods used in bypass transition (Sasaki et al 2019) is a promising direction for the control of wall-bounded turbulence.…”
Section: Discussionmentioning
confidence: 98%
“…Moreover, reconstructions of flow fluctuations from a limited number of sensors are also possible using the resolvent operator (Towne et al 2020), which opens possibilities for closed-loop control of turbulent flows. As the lift-up effect studied here is also the basis of bypass transition in boundary layers (Andersson, Berggren & Henningson 1999;Brandt 2014), extension of control methods used in bypass transition (Sasaki et al 2019) is a promising direction for the control of wall-bounded turbulence.…”
Section: Discussionmentioning
confidence: 98%
“…In fact, the low-rank characteristic of the forcing reduces the number of unknown parameters to identify, which reduces the complexity of the identification problem and increases the accuracy of the estimation (Hjalmarsson & Mårtensson 2007). Moreover, the found low-rank approximation of the forcing can be helpful to the control community for the design or placement of a counteracting forcing as actuator, following ideas similar to Sasaki et al (2020).…”
Section: Discussionmentioning
confidence: 99%
“…Moreover, the found low-rank approximation of the forcing can be helpful to the control community for the design or placement of a counteracting forcing as actuator, following ideas similar to Sasaki et al. (2020).…”
Section: Discussionmentioning
confidence: 99%
“…Finally, it can be concluded that the performance of the best LQG result is better than those of the best IFFC thanks to the possibility of increasing the estimation accuracy through the estimation weights, which allows to slightly compensate for the reverse causality between the wall shear-stress measurements and the dynamics of the streaks. Moreover, it appears that the limitation caused by the structure of the plant, including the location of sensors and actuators and their shapes, is more critical than the choice of control technique, and thus is the key design challenge (as further discussed in the parallel work Sasaki et al (2019)).…”
Section: Role Of Control Methods Sensors and Actuators For Control Pmentioning
confidence: 99%
“…This is efficient to excite or cancel streaks A realizable data-driven approach to delay bypass transition 883 A33-11 due to the lift-up effect. A detailed analysis on the effect of the actuator shape is presented in Sasaki et al (2019), which is the parallel work to the present one. The outputs are computed as…”
Section: Plantmentioning
confidence: 97%