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Large-eddy simulations of control of separated flow over a 2D bump by means of pulsed-jets.

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2010
auteur(s) Laval Jean-Philippe; Braud Caroline; Fournier Guillaume; Stanislas Michel
journal (abréviation) Journal of Turbulence (JOT)
volume (numéro) 11 (52)
  
résumé A numerical study of active flow control of a separated converging-diverging channel flow is presented. Several geometrical and operating parameters of the continuous and pulsed jets are investigated using Large Eddy Simulations (LES) which are highly resolved in the actuation region. The LES without control is validated with a Direct Numerical Simulation (DNS) of the same flow. Configurations with both counter-rotating and co-rotating jets are tested. The main statistical results are in general agreement with the literature. Thanks to the unsteady highly resolved simulation, both temporal and spatial organization of the generated vortices are investigated. An optimal frequency associated to the convective time as well as an optimal duty cycle are obtained, leading to a control efficiency comparable to the cases with continuous jets and the same operating velocity and, consequently, to a significant saving in mass flow rate.
mots clés turbulence, active control, pulsed-jets
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