Flow coherent structures and frequency signature: Application of the dynamic modes decomposition to open cavity flow

F. Lusseyran (1) , F. Guéniat (1, 2) , J. Basley (1, 2, 3) , C.L. Douay (1, 4) , L.R. Pastur (1, 2) , T.M. Faure (1, 4) , Peter J. Schmid (5)

1 LIMSI - Laboratoire d'Informatique pour la Mécanique et les Sciences de l'Ingénieur
2 UP11 - Université Paris-Sud - Paris 11
3 LTRAC, Department of Aerospace and Mechanical Engineering, Monash University, Melbourne, VIC 3800, Australia
4 UPMC - Université Pierre et Marie Curie - Paris 6
5 LadHyX - Laboratoire d'hydrodynamique

The dynamic dimension of an impinging flow may be significantly reduced by its boundary conditions and self-sustained oscillations they induce. The spectral signature is associated with remarkable spatial coherent structures. Dynamic modes decomposition (DMD) makes it possible to directly extract the dynamical properties of a non-linearly saturated flow. We apply DMD to highlight the spectral contribution of the longitudinal and transverse structures of an experimental open-cavity flow.

Domains: Fluid mechanics [physics.class-ph]; Fluids mechanics [physics.class-ph]

F. Lusseyran, F. Guéniat, J. Basley, C.L. Douay, L.R. Pastur, et al.. Flow coherent structures and frequency signature: Application of the dynamic modes decomposition to open cavity flow. 13th European Turbulence Conference (ETC13), Sep 2011, Warsaw, Poland. pp.042036, ⟨10.1088/1742-6596/318/4/042036⟩. ⟨hal-01025972⟩