Open-loop control of three-dimensional wakes

International audienceWe illustrate the problem of wake optimisation on the generic case of the three-dimensional cylinder. After a description of the numerical method, several optimisation strategies are presented, aiming at identifying vortex systems providing drag reduction or special topology of the flow. On the one hand, strategies as simple as cylinder rotation or bidimensional stationary profiles of velocity are considered. On the other hand, an outlook of full 3D tangential controls is presented, which may be mixed or not with the simple strategies above