Summary
Controlling laminar-turbulent transition in boundary layers is an important topic of future aerodynamics. With the aid of Direct Numerical Simulation (DNS) and Linear Stability Theory (LST) we examine different active approaches in various flow scenarios. The superposition of disturbances with opposite phase to the initial waves in the boundary layer leads to a significant attenuation only in linear and weakly nonlinear scenarios. In stages close to transition where strong nonlinearity has taken place we were able to develop a method which is better suited. The direct feedback of instantaneous flow data obtained at the wall (wall shear stress or spanwise vorticity) leads to better dam** capabilities of nonlinear disturbances. We can show that the main mechanism of this concept lies in the change of the sign of the Reynolds stress of the participating modes. In addition, existing resonances are disrupted due to the modified phase speed of the controlled modes.
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Gmelin, C., Rist, U., Wagner, S. (2004). Numerical investigations of active control of boundary-layer instabilities. In: Wagner, S., Kloker, M., Rist, U. (eds) Recent Results in Laminar-Turbulent Transition. Notes on Numerical Fluid Mechanics and Multidisciplinary Design (NNFM), vol 86. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-45060-3_16
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DOI: https://doi.org/10.1007/978-3-540-45060-3_16
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