Abstract
Experimental investigations confirmed a significant drag reduction effect by means of either riblet structured or actuated surfaces. Combining both passive and active mechanisms might even further improve this effect. To determine appropriate physical parameter ranges computations must be highly efficient. For this purpose, a model order reduction method is developed. By means of an upscaling strategy time dependent effective boundary conditions on a virtually smooth actuated wall are derived, modeling the influence of the riblets without resolving them. Numerical simulations for the configuration of a compressible flow over an actuated riblet surface verify the efficiency of the reduced model.
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