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DPIV, HPTV and visualization study of a vortex ring-moving wall interaction

type de publication      article in an international journal with refereeing comitee
date de publication 2002
auteur(s) Dupont Patrick; Croisier G.; Werquin O.; Stanislas Michel
journal Experiments in Fluids
volume (numéro) 33
pages 555 – 564
résumé This paper presents an experimental study of the interaction between a vortex ring and a moving wall. This type of flow can be considered as modeling, in a simplified way, the interaction between a "typical eddy" and the viscous sublayer of a turbulent boundary layer. In the present study, the vortex ring is considered as a three-dimensional (3D) perturbation of a viscous Stokes layer. The interaction was first characterized by visualisation. To obtain quantitative information, diggtal particle image velocimetry (DPIV) and holographic particle-tracking velocimetry (HPTV) were used. These different techniques led to a precise and detailed characterization of the vortex ring alone and of an interaction in wich a hairpin vortex is gererated in the Stokes layer. The results obtained show a good similarity between the observed vortex ring and the Oseen model. THey also validate the Stokes layer model and show that in the present conditions, the hairpin vorticity is comparable to that of the Stokes layer. The holographic study, which was indertaken to obtain full 3D three-component (3D3C) velocity maps, showed the present limitations of HPTV
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