Optimal perturbations in boundary layer flows over rough surfaces
dc.contributor.author
hal.structure.identifier | CHERUBINI, Stefania
|
dc.contributor.author | DE TULLIO, Marco |
dc.contributor.author
hal.structure.identifier | DE PALMA, Pietro
|
dc.contributor.author | PASCAZIO, Giuseppe |
dc.date.accessioned | 2014 |
dc.date.available | 2017 |
dc.date.issued | 2013 |
dc.date.submitted | 2014 |
dc.identifier.issn | 0098-2202 |
dc.identifier.uri | http://hdl.handle.net/10985/9013 |
dc.description.abstract | This work provides a three-dimensional energy optimization analysis, looking for perturbations inducing the largest energy growth at a finite time in a boundary-layer flow in the presence of roughness elements. The immersed boundary technique has been coupled with a Lagrangian optimization in a three-dimensional framework. Four roughness elements with different heights have been studied, inducing amplification mechanisms that bypass the asymptotical growth of Tollmien-Schlichting waves. The results show that even very small roughness elements, inducing only a weak deformation of the base flow, can strongly localize the optimal disturbance. Moreover, the highest value of the energy gain is obtained for a varicose perturbation. This result demonstrates the relevance of varicose instabilities for such a flow and shows a different behavior with respect to the secondary instability theory of boundary layer streaks. |
dc.language.iso | en |
dc.publisher | American Society of Mechanical Engineers |
dc.rights | Post-print |
dc.subject | Boundary layer flow |
dc.subject | Three dimensional, Optimization |
dc.title | Optimal perturbations in boundary layer flows over rough surfaces |
ensam.embargo.terms | 10 Year |
dc.identifier.doi | 10.1115/1.4025028 |
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 | 4025028 |
ensam.journal | Journal of Fluids Engineering |
ensam.volume | 135 |
ensam.issue | 4025028 |
hal.identifier | hal-01088720 |
hal.version | 1 |
hal.submission.permitted | updateMetadata |
hal.status | unsent |