Perimetric blowing at the rear of a bluff body: consequences on the wake dynamics and drag reduction

Abstract

In a perspective of active flow control of the bistable wake of a square-back Ahmed body, we show that the steady blowing through a perimetric slit at the rear of the body is not equivalent to a material rear perimetric cavity, the latter being able to suppress the bistable dynamics and symmetrize the wake flow, while the former cannot achieve any of the two targets, indicating that the steady perimetric blowing has no control authority on the symmetric unstable steady solution of the system.