Open and closed-loop control of a triangular bluff body using rotating cylinders
Résumé
The active control of vortex shedding from a bluff body consisting of three rotating
cylinders in triangular arrangement is studied numerically and experimentally. The flow is
characterized at low Reynolds number Re ∼ 4000 − 6000. Open-loop cases are considered
to understand the influence of maximum rotation rate Ω and the non-dimensional forcing
frequency F ∗ , scaled by the cylinder radius R and the free-stream velocity U ∞ . Feedback control
is considered by acquiring the hot-wire sensor signal in the wake and using it for the cylinders
rotation speeds update. Adaptive and robust controllers are also be designed for the closed-loop
control. As the parametric space for the controllers parameters is very large, machine learning
using genetic programming will be a major technique for the command law optimization.