Unsteady behavior in forced ow over a ...
Type de document :
Compte-rendu et recension critique d'ouvrage
Titre :
Unsteady behavior in forced ow over a backward-facing step
Auteur(s) :
Chovet, Camila [Auteur]
Laboratoire d'Automatique, de Mécanique et d'Informatique industrielles et Humaines - UMR 8201 [LAMIH]
Lippert, Marc [Auteur]
Laboratoire d'Automatique, de Mécanique et d'Informatique industrielles et Humaines - UMR 8201 [LAMIH]
Keirsbulck, Laurent [Auteur]
Laboratoire d'Automatique, de Mécanique et d'Informatique industrielles et Humaines - UMR 8201 [LAMIH]
Foucaut, Jean-Marc [Auteur]
Laboratoire de Mécanique des Fluides de Lille – Kampé de Fériet - UMR 9014 [LMFL]
Laboratoire d'Automatique, de Mécanique et d'Informatique industrielles et Humaines - UMR 8201 [LAMIH]
Lippert, Marc [Auteur]
Laboratoire d'Automatique, de Mécanique et d'Informatique industrielles et Humaines - UMR 8201 [LAMIH]
Keirsbulck, Laurent [Auteur]
Laboratoire d'Automatique, de Mécanique et d'Informatique industrielles et Humaines - UMR 8201 [LAMIH]
Foucaut, Jean-Marc [Auteur]
Laboratoire de Mécanique des Fluides de Lille – Kampé de Fériet - UMR 9014 [LMFL]
Titre de la revue :
Flow, Turbulence and Combustion
Pagination :
145-165
Éditeur :
Springer Verlag (Germany)
Date de publication :
2019
ISSN :
1386-6184
Discipline(s) HAL :
Physique [physics]
Sciences de l'ingénieur [physics]
Sciences de l'ingénieur [physics]/Milieux fluides et réactifs
Sciences de l'ingénieur [physics]
Sciences de l'ingénieur [physics]/Milieux fluides et réactifs
Résumé en anglais : [en]
The unsteady behavior of a turbulent ow over a backward-facing step was investigated under controlled actuation at a Re h = 31500. Initial measurements were made changing the periodic forcing frequency St a from 0.045 to ...
Lire la suite >The unsteady behavior of a turbulent ow over a backward-facing step was investigated under controlled actuation at a Re h = 31500. Initial measurements were made changing the periodic forcing frequency St a from 0.045 to 0.453. The best forcing frequency was observed at a dimensionless frequency of St a = 0.226 and is associated with the shedding frequency. This frequency can eectively reduce the reattachment length and thus the recirculation area. A further study of the dynamical aspects of the un-actuated and actuated ows is also presented. The velocity elds were measured using a particle image velocimetry (Piv) system. Pod techniques were used to analyze the ow. With this procedure, the pressure uctuation power spectra was separated in 5 dierent modes. The two rst modes contained a predominant peak at around 0.12 corresponding to the apping motion (low frequency of the large scale structures). The other modes (from 3 to 5) showed a transitional and increasing peak that is related to the shedding phenomena. Results suggest that an excitation on the shedding frequency leads to a decrease of the external separation length L r , an increase of the internal separation length X r and a further decrease of the recirculation area.Lire moins >
Lire la suite >The unsteady behavior of a turbulent ow over a backward-facing step was investigated under controlled actuation at a Re h = 31500. Initial measurements were made changing the periodic forcing frequency St a from 0.045 to 0.453. The best forcing frequency was observed at a dimensionless frequency of St a = 0.226 and is associated with the shedding frequency. This frequency can eectively reduce the reattachment length and thus the recirculation area. A further study of the dynamical aspects of the un-actuated and actuated ows is also presented. The velocity elds were measured using a particle image velocimetry (Piv) system. Pod techniques were used to analyze the ow. With this procedure, the pressure uctuation power spectra was separated in 5 dierent modes. The two rst modes contained a predominant peak at around 0.12 corresponding to the apping motion (low frequency of the large scale structures). The other modes (from 3 to 5) showed a transitional and increasing peak that is related to the shedding phenomena. Results suggest that an excitation on the shedding frequency leads to a decrease of the external separation length L r , an increase of the internal separation length X r and a further decrease of the recirculation area.Lire moins >
Langue :
Anglais
Vulgarisation :
Non
Source :
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