Streakline-based closed-loop control of a bluff body flow

PABLO ROCA; ADA CAMMILLERI; THOMAS DURIEZ; LIONEL MATHELIN; GUILLERMO ARTANA

PHYSICS OF FLUIDS

AMER INST PHYSICS

Lugar: New York; Año: 2014 vol. 26

1070-6631

A novel closed-loop control methodology is introduced to stabilize a cylinder wake flow based on images of streaklines. Passive scalar tracers are injected upstream the cylinder and their concentration is monitored downstream at certain image sectors of the wake. An AutoRegressive with eXogenous inputs (ARX) math-ematical model is built from these images and a Generalized Predictive Controller (GPC) algorithm is used to compute the actuation required to stabilize the wake by adding momentum tangentially to the cylinder wall through plasma actuators. The methodology is new and has numerous real-world applications. It is demonstrated on a numerical simulation and the provided results show that good performances are achieved.