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LOW-DIMENSIONAL GALERKIN MODEL OF A PLANE MIXING LAYER-WAKE INTERACTION

Caroline Braud
Univ Lille Nord de France, CNRS, Laboratoire de Mecanique de Lille (UMR 8107) Boulevard Paul Langevin, 59655 Villeneuve d'Ascq Cedex, France

Dominique Heitz
Cemagref, 17, avenue de Cucille, F35044 Rennes Cedex - France

Georges Arroyo
Cemagref, Université européenne de Bretagne, 17 av de Cucillé, CS64427, F-35044 Rennes Cedex, France

Joel Delville
Department of Fluid Flow, Heat Transfer and Combustion Institute Pprime - UPR 3346 - CNRS - Universite de Poitiers - ENSMA CEAT - F86036 Poitiers cedex, France

Jean-Paul Bonnet
Institut Pprime-Branche fluide Université de Poitiers 43 route de l'aérodrome,86000 Poitiers, France

Resumo

The complex 3D dynamical behavior resulting from the interaction between a plane mixing layer and the wake of a cylinder is investigated using the proper orthogonal decomposition, applied to data from two synchronized 2D PIV systems. An analysis of the correlations shows different length scales in the regions dominated by wake like structures and shear layer type structures. In order to characterize the particular organization in the plane of symmetry, a Galerkin projection from a slice POD is performed. This leads to a low-dimensional dynamical system that allows the analysis of the relationship between the dominant frequencies and leads to a reconstruction of the dominant periodic motion suspected from previous studies (Heitz, 1999).