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dc.contributor.authorMERLE, Matthieu
dc.contributor.author
 hal.structure.identifier
EHRENSTEIN, Uwe
196526 Institut de Recherche sur les Phénomènes Hors Equilibre [IRPHE]
dc.contributor.author
 hal.structure.identifier
ROBINET, Jean-Christophe
134975 Laboratoire de Dynamique des Fluides [DynFluid]
dc.date.accessioned2013
dc.date.available2013
dc.date.issued2013
dc.date.submitted2013
dc.identifier.urihttp://hdl.handle.net/10985/7396
dc.description.abstractFlow separation is a common feature in wall-bounded flow, where it is generally induced by an adverse pressure gradient. Here we reconsider a bump-type geometry which has been used in previous numerical investigations of the stability of the laminar recirculation bubble for incompressible flow. It has been shown for low Reynolds number that the first bifurcation of the 2D stationnary flow is characterized by a zero-frequency 3D instability mode. For larger Reynolds number a second bifurcation appears (Hopfbifurcation) and separated boundary-layer is then subject to a low frequency phenomenon known as’flapping’. The influence of compressibility for this type of flow is assessed.We first solve the compressible Navier-Stokes equations in order to obtain an equilibrium solution for increasing compressibility effects. Two-dimensional global stability of this solution is then investigatesand we assess the influence of Mach number on the critical Reynolds number for which the separated flow becomes unstable with respect to oscillatory perturbations.Three-dimensional transverse instabilities are addressed as well and in particular the evolution of growth rate and transverse wave length of the most unstable mode for several Mach numbers.
dc.rightsPost-print
dc.subjectinstabilités globales
dc.subjectécoulements compressibles
dc.subjectdécollement
dc.titleInstabilités bi-et tridimensionnelles dans une couche limite décollée compressible subsonique
dc.typdocCommunication avec acte
dc.localisationCentre de Paris
dc.subject.halSciences de l'ingénieur: Mécanique: Mécanique des fluides
dc.subject.halSciences de l'ingénieur: Mécanique: Mécanique des solides
dc.subject.halSciences de l'ingénieur: Milieux fluides et réactifs
ensam.audienceInternationale
ensam.conference.titleCongrès français de mécanique (21 ; 2013 ; Bordeaux (Gironde)
ensam.conference.date2013-08-26
ensam.countryFrance
ensam.title.proceedingCongrès français de mécanique (21 ; 2013 ; Bordeaux (Gironde)
ensam.page1-6
hal.identifierhal-00873534
hal.version1
hal.statusaccept


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