Forcing three-dimensional large-scale flow asymmetries in the wake of blunt body : wake equilibrium and drag reduction
Résumé
We experimentally study the effect of high-frequency fluidic forcing on various
asymmetric turbulent wakes behind a blunt body at ReH = 5 .105
. Different wake asymmetries
are obtained by the use of passive perturbations around the body modifying the wake
equilibrium. High-frequency forcing of the wake along the rear edges is then applied to
increase the base pressure. Depending on the initial unforced wake vertical equilibrium,
localized forcing along the top or bottom edges may strongly increase or decrease the base
pressure. The efficiency of spatially localized forcing and the fluidic boat-tailing thus created
is linked to the global wake equilibrium and its modification
Domaines
Sciences de l'ingénieur [physics]Origine | Fichiers produits par l'(les) auteur(s) |
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