OPTIMAL LOCATION OF SUCTION OR BLOWING JETS USING THE CONTINUOUS ADJOINT APPROACH

This paper presents the use of the continuous adjoint method as a low-cost tool to derive useful information regarding the optimal location and type of steady suc- tion/blowing jets, used to control flow separation. An objective function that expresses the total pressure losses between the inlet and outlet of the flow domain is devised. The derivatives of this objective function with respect to hypothetical jet velocities at the wall boundaries are then computed using the continuous adjoint method. Emphasis is laid on the computation of the exact sensitivity derivatives and, for this reason, the adjoint to the turbulence (Spalart-Allmaras) model is also used, as proposed in a recent publication by the same authors. The proposed method is demonstrated by controlling the separated flow in a S-shaped duct.

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