Computational Investigation of Separation Control for High-Lift Airfoil Flows

Reduced-Order Modelling for Flow Control

“…These local modes and the local mean flow can be computed as slowly varying, distributed Fourier coefficients of the flow field, a perspective we shall also elucidate in short order. This configuration has been the subject of several experimental and numerical flow control studies the Berlin Institute of Technology and our group, including Schatz et al, 2007;Kaepernick et al, 2005;. Figure 2 depicts 3 the mean fields and the dominant mode-pair at the beginning of the natural transient, at a mid-point, and following the convergence to the natural attractor.…”

Feature-Based Comparison of Flow Fields Around a Three-Element High-Lift Configuration with Active Flow Control

“…In further investigations oscillatory suction and blowing was found to be much more efficient with respect to lift than steady blowing. [11][12][13] The process becomes very efficient if the excitation frequencies correspond to the most unstable frequencies of the free shear layer, generating arrays of spanwise vortices that are convected downstream and continue to mix across the shear layer. Suction and blowing can be applied tangential to the airfoil surface, 14 perpendicular 15 or with cyclic vortical oscillation.…”

Low Order Galerkin Models for the Actuated Flow Around 2-D Airfoils

“…The two-dimensional high lift configuration represents the swept constant chord half (SCCH) model, see fig. 1, used in several studies targeting flow control, 20 . 21 The main section angle of attack is 6 o , and the flap and slat angles are as indicated in fig.…”