title: Sporadic feedback control of flow turbulence.
abstract: In this work we consider the problem of flow turbulence control in a two-dimensional Navier-Stokes equation. We suggest a control strategy which sporadically applies global feedback to a single velocity component of the velocity field. It is found that this control strategy can significantly enhance the control efficiency when the optimal fraction for the control period is suitably chosen, both larger and smaller control time fractions may reduce the control precision. The physical mechanism underlying this interesting and strange behavior is heuristically analyzed, based on mode-mode interactions.
authors.affiliation: Department of Physics, Beijing Normal University, China.
authors.forename: Guoning
authors.initials: G
authors.lastname: Tang
authors.forename: Gang
authors.initials: G
authors.lastname: Hu