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Numerical simulations of the flow in a converging-diverging channel with control through a spanwise slot

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2010
auteur(s) Fournier Guillaume; Laval Jean-Philippe; Braud Caroline; Stanislas Michel
journal (abréviation) International Journal of Flow Control (Int J Flow Contr)
volume (numéro) 2 (4)
  
pages 289 – 310
résumé The flow in a converging-diverging channel at Reτ = 180 is studied by Direct Numerical and Large Eddy Simulations. Continuous and pulsed jets are applied normally to the wall through a spanwise slot to delay the separation. The influence of the position is first analysed and it is shown that the control efficiency is closely linked to the location of the actuation within the channel. A parametric study on both the intensity and pulsating frequency for the ”optimal” position shows that the separation can be drastically reduced and even vanishes with a proper choice of parameters. It is additionally reported that pulsed jets yield better results than continuous jets at an equivalent mass-flux. Moreover, low frequencies are shown to be more efficient than high frequencies. A physical analysis finally demonstrates that the efficiency of the low frequency pulsed jets is mainly due to the creation of spanwise structures, that does not occur in other cases.
mots clés turbulence, control
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