Optimal Boundary Control Problems Related to High-Lift Configurations

Abstract

We investigate two control problems related to the aerodynamic optimization of flows around airfoils in high-lift configurations. The first issue is the steady state maximization of lift subject to restrictions on the drag. This leads to a boundary control problem for the 2D stationary Navier-Stokes equations with constrained controls functions belonging to L 2 (Γ ) under an integral state constraint. We derive optimality conditions and treat the problem numerically by direct solution of the associated nonsmooth optimality system. The second part is based on a k-ω-WILCOX98 turbulence model. To deal with the curse of dimension, we discuss a reduced-order model by adapting a small system of ODEs to solutions computed with the full model.

Reduced-Order Modelling for Flow Control

“…In the sequel, we outline a simple identification technique which has been employed in a number of turbulence control studies with periodic forcing (Luchtenburg et al, 2009a(Luchtenburg et al, , 2010John et al, 2010). Let f i be the propagator of the natural dynamics and b be the amplitude of a local actuator.…”