[hal-00628641] Control and mixing for 2D Navier-Stokes equations with space-time localised noise

We consider randomly forced 2D Navier-Stokes equations in a bounded domain with smooth boundary It is assumed that the random perturba- tion is non-degenerate and its law is periodic in time and has a support localised with respect to space and time Concerning the unperturbed problem we assume that it is approximately controllable in infinite time by an external force whose support is included in that of the random force Under these hypotheses we prove that the Markov process generated by the restriction of solutions to the instants of time proportional to the period possesses a unique stationary distribution which is exponentially mixing The proof is based on a coupling argument a local controllability property of the Navier-Stokes system an estimate for the total variation distance between a measure and its image under a smooth mapping and some classical results from the theory of optimal transport



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