The aero-structural design of an adaptive vortex generator for repeatable, elastic, deployment and retraction from an
aerodynamically clean surface is presented. A multidisciplinary objective function, containing geometrically nonlinear
nite element analysis and large eddy simulation, is used to derive the optimal adaptive geometry for increasing the
momentum of the near wall uid. It is found that the rapid increase of in-plane membrane stress with de ection is a
signi cant limitation on achievable deformation of a continuous skin with uniform section. Use of a 2D auxetic lattice
structure in place of the continuous skin allows signi cantly larger deformations and thus a signi cant improvement in
performance. The optimal deformed geometry is replicated statically and the e ect on the boundary layer is validated
in a wind tunnel experiment. The lattice structure is then manufactured and actuated. The deformed geometry is
shown to compare well with the FEA predictions. The surface is re-examined post actuation and shown to return to
the initial position, demonstrating the deformation is elastic and hence repeatable.