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Control of Tollmien–Schlichting instabilities by finite distributed wall actuation

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Abstract

Tollmien–Schlichting waves are one of the key mechanisms triggering the laminar-turbulent transition in a flat-plate boundary-layer flow. By damping these waves and thus delaying transition, skin friction drag can be significantly decreased. In this simulation study, a wall segment is actuated according to a control scheme based on a POD-Galerkin model driven extended Kalman filter for state estimation and a model predictive controller to dampen TS waves by negative superposition based on this information. The setup of the simulation is chosen to resemble actuation with a driven compliant wall, such as a membrane actuator. Most importantly, a method is proposed to integrate such a localized wall actuation into a Galerkin model.

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Correspondence to Nikolas R. Losse.

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Communicated by T. Colonius

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Losse, N.R., King, R., Zengl, M. et al. Control of Tollmien–Schlichting instabilities by finite distributed wall actuation. Theor. Comput. Fluid Dyn. 25, 167–178 (2011). https://doi.org/10.1007/s00162-010-0192-8

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  • DOI: https://doi.org/10.1007/s00162-010-0192-8

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