Decomposition of time-resolved tomographic PIV

Peter J. Schmid (1) , D. Violato (2) , O. Pust (3) , F. Scarano (2)

1 LadHyX - Laboratoire d'hydrodynamique
2 Faculty of Aerospace Engineering [Delft]
3 Dantec Dynamics

An experimental study has been conducted on a transitional water jet at a Reynolds number of Re = 5000. Flow fields have been obtained by means of time-resolved tomographic particle image velocimetry (TR-TOMO PIV) capturing all relevant spatial and temporal scales. The measured three-dimensional flow fields have then been postprocessed by the dynamic mode decomposition (DMD) which identifies coherent structures that contribute significantly to the dynamics of the jet. Where the jet exhibits a primary axisymmetric instability followed by a pairing of the vortex rings, dominant dynamic modes have been extracted together with their amplitude distribution. These modes represent a basis for the low-dimensional description of the dominant flow features.

Domaines: Mécanique des fluides [physics.class-ph]; Mécanique des fluides [physics.class-ph]

Peter J. Schmid, D. Violato, O. Pust, F. Scarano. Decomposition of time-resolved tomographic PIV. 15th International Symposium on Applications of Laser Techniques in Fluid Mechanics, Jul 2010, Lisbonne, Portugal. pp.3.7.1. ⟨hal-01052852⟩