Reorganization of Coherent Structures Downstream a Circular Cylinder Located between Two Parallel Walls

Authors

1 Université de Monastir, École Nationale d’Ingénieurs de Monastir, Laboratoire LESTE, Avenue Ibn El Jazzar 5019 - Monastir, Tunisie

2 Université de Nantes, Faculté des Sciences et des Techniques, Département de Physique, 2, rue de la Houssinière BP 92206 - 44322 Nantes Cedex 03, France

Abstract

Experiments were performed at low Reynolds numbers in the range 75 Re 275 in the wake of a circular cylinder of dc diameter placed symmetrically between two parallel walls of H height. 2D2C particle image velocimetry (PIV) was used to investigate the flow downstream the cylinder. In the unsteady flow regime downstream the cylinder, the detached primary vortices (Pi) interact with walls generating secondary ones (Pi’) and modify the cylinder wake dynamic. The kinematical properties (advection velocity, circulation, rotation kinetic energy, etc.) of the generated secondary vortices are studied and compared with the primary ones in order to show how the walls influence the von Kármán vortex street. The authors propose here a relation between the circulations and kinetic energies of primary and secondary vortices.

Keywords

Journal of Applied Fluid Mechanics
Volume 4, Issue 2
February 2012
Pages 51-56

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