This work is devoted to the numerical comparison of four active control
techniques in order to increase the pressure recovery generated by the
deceleration of a slightly compressible viscous flow over a dihedral plane.
It is performed by the
use of vortex generator jets and intrusive sensors. The governing equations,
the two-dimensional direct numerical simulation code and the
flow configuration are first briefly recalled. Then, the objective of the
control is carefully displayed, and the uncontrolled flow described.
The main part of this work deals with the explanation, the implementation and
the comparison of four active control strategies: closed loop control,
adaptative control, physical ramp control and sub-optimal
control. Each of these techniques is of different nature,
and results are very formative to understand what is important
– or less – to make the control efficient.