Model free active flow control of a simplified car model

Baptiste Plumejeau (1) , Sebastien Delprat (1, 2) , Laurent Keirsbulck (1)

1 LAMIH - Laboratoire d'Automatique, de Mécanique et d'Informatique industrielles et Humaines - UMR 8201
2 INSA Hauts-De-France - INSA Institut National des Sciences Appliquées Hauts-de-France

A model free control (MFC) approach is presented and used to symmetrize the unstable wake flow of a simplified car model named Ahmed body. Such unstable phenomena with regards to the space-time evolution of the low pressure wake vortex core, is known to increase the global drag of square back vehicles. Results highlight the ability of a MFC to reduce the wake symmetry breaking phenomena by using lateral blowing slit jets. A model free control scheme derived from (Fliess and Join, 2013) is proposed and a tuning procedure is suggested. At last experimental results on an Ahmed body in wind tunnel are provided.

Mots clés: Ahmed body; Air flow control; experimental results; model free control

Domaines: Sciences de l'ingénieur [physics]

Baptiste Plumejeau, Sebastien Delprat, Laurent Keirsbulck. Model free active flow control of a simplified car model. IFAC-PapersOnLine, 2019, 52 (5), pp.115-120. ⟨10.1016/j.ifacol.2019.09.019⟩. ⟨hal-03679783⟩