Développement d'instabilités dans un écoulement subsonique se développant au-dessus d'une cavité : mesures synchronisées PIV-LDV

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dc.creatorFaure, Thierry
dc.creatorLusseyran, François
dc.creatorPastur, Luc
dc.creatorPethieu, Romain
dc.creatorDebesse, Philippe
dc.date2006-09-01
dc.date.accessioned2026-07-07T07:25:59Z
dc.date.available2026-07-07T07:25:59Z
dc.descriptionA boundary layer interacting with a cavity is a benchmark case that is present in environmental applications, aeronautics, automobile aerodynamics or industrial applications, where the velocity over a rectangular cavity is relatively low. In the present investigation, the interaction between a laminar boundary layer with external velocity Ue and an open cavity is investigated experimentally for medium range Reynolds numbers (between 4600 and 18500) with flow diagnostics optical methods, for a cavity aspect ratio (length over depth) of two. A shear layer induces a main vortex and a counter-rotating secondary vortex inside the cavity. The shear layer also develops instabilities interacting with the downstream cavity edge. Particle image velocimetry (PIV) and laser Doppler velocimetry (LDV) measurements are synchronized in order to get global information of both spatial velocity fields and time-resolved signals in a particular position situated downstream of the development of the shear layer above the cavity. The PIV velocity fields are phase-averaged with a singular value decomposition of the LDV signal.
dc.description8 pages
dc.identifierhttps://arxiv.org/abs/physics/0609008
dc.identifierhttp://arxiv.org/abs/physics/0609008
dc.identifierCongrès Francophone de Techniques Laser, CFTL 2006, Toulouse, 19 - 22 septembre 2006, France (2006)
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/116920
dc.subjectClassical Physics
dc.titleDéveloppement d'instabilités dans un écoulement subsonique se développant au-dessus d'une cavité : mesures synchronisées PIV-LDV
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