Rapid path to transition via nonlinear localized optimal perturbations in a boundary-layer flow
dc.contributor.author
hal.structure.identifier | CHERUBINI, Stefania
|
dc.contributor.author
hal.structure.identifier | DE PALMA, Pietro
|
dc.contributor.author | BOTTARO, Alessandro |
dc.contributor.author
hal.structure.identifier | ROBINET, Jean-Christophe
|
dc.date.accessioned | 2013 |
dc.date.available | 2013 |
dc.date.issued | 2010 |
dc.date.submitted | 2013 |
dc.identifier.issn | 2470-0045 |
dc.identifier.uri | http://hdl.handle.net/10985/6861 |
dc.description.abstract | Recent studies have suggested that in some cases transition can be triggered by some purely nonlinear mechanisms. Here we aim at verifying such an hypothesis, looking for a localized perturbation able to lead a boundary-layer flow to a chaotic state, following a nonlinear route. Nonlinear optimal localized perturbations have been computed by means of an energy optimization which includes the nonlinear terms of the Navier- Stokes equations. Such perturbations lie on the turbulent side of the laminar-turbulent boundary, whereas, for the same value of the initial energy, their linear counterparts do not. The evolution of these perturbations toward a turbulent flow involves the presence of streamwise-inclined vortices at short times and of hairpin structures prior to breakdown. |
dc.language.iso | en_US |
dc.publisher | American Physical Society (APS) |
dc.rights | Post-print |
dc.subject | turbulence transition |
dc.subject | boundary-layer |
dc.subject | non-linear instability |
dc.title | Rapid path to transition via nonlinear localized optimal perturbations in a boundary-layer flow |
dc.identifier.doi | 10.1103/PhysRevE.82.066302 |
dc.typdoc | Article dans une revue avec comité de lecture |
dc.localisation | Centre de Paris |
dc.subject.hal | Sciences de l'ingénieur: Mécanique: Mécanique des fluides |
ensam.audience | Internationale |
ensam.page | 5 |
ensam.journal | Physical Review E |
ensam.volume | 82 |
hal.identifier | hal-00799736 |
hal.version | 1 |
hal.submission.permitted | updateMetadata |
hal.status | accept |
dc.identifier.eissn | 2470-0053 |