Experimental study of the vortex rings generated by an oscillating disc - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2022

Experimental study of the vortex rings generated by an oscillating disc

Résumé

This study experimentally investigates the generation of vortices at the edges of an oscillating disc in an initially quiescent fluid. The roll-up of the shear layer produced at the edge of the disc generates a vortex ring at each half-oscillation which interacts with the vortex ring generated in the previous half-cycle. First, we describe the different flow regimes by flow visualizations depending on the disc diameter D, the amplitude A, and the frequency f of oscillation. We identify mainly four regimes. The asymmetry between the vortex rings generated at each half-oscillation characterizes one of these regimes: a circular core vortex ring is generated during one halfoscillation, preventing the creation of the vortex ring that is supposed to be generated at the next half-oscillation. Then, in this asymmetric regime, we determine the features of the circular core vortex ring by PIV (Particle Image Velocimetry). The characteristics of the vortex ring, i.e., its size, position, and circulation, can be fitted to scaling laws depending on the variable parameters.
Fichier non déposé

Dates et versions

hal-04439470 , version 1 (05-02-2024)

Identifiants

  • HAL Id : hal-04439470 , version 1

Citer

Joanne Steiner, Cyprien Morize, Alban Sauret, Philippe Gondret. Experimental study of the vortex rings generated by an oscillating disc. Rencontre du Non-Linéaire, Mar 2022, Paris, France. ⟨hal-04439470⟩
8 Consultations
0 Téléchargements

Partager

Gmail Facebook X LinkedIn More