Experimental study on water-wave trapped modes - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Fluid Mechanics Année : 2011

Experimental study on water-wave trapped modes

Résumé

We present an experimental study on the trapped modes occurring around a vertical surface-piercing circular cylinder of radius a placed symmetrically between the parallel walls of a long but finite water waveguide of width 2 d . A wavemaker placed near the entrance of the waveguide is used to force an asymmetric perturbation into the guide, and the free-surface deformation field is measured using a global single-shot optical profilometric technique. In this configuration, several values of the aspect ratio a / d were explored for a range of driving frequencies below the waveguide's cutoff. Decomposition of the obtained fields in harmonics of the driving frequency allowed for the isolation of the linear contribution, which was subsequently separated according to the symmetries of the problem. For each of the aspect ratios considered, the spatial structure of the trapped mode was obtained and compared to the theoretical predictions given by a multipole expansion method. The waveguide–obstacle system was further characterized in terms of reflection and transmission coefficients, which led to the construction of resonance curves showing the presence of one or two trapped modes (depending on the value of a / d ), a result that is consistent with the theoretical predictions available in the literature. The frequency dependency of the trapped modes with the geometrical parameter a / d was determined from these curves and successfully compared to the theoretical predictions available within the frame of linear wave theory.
Fichier principal
Vignette du fichier
art_59.pdf (2.24 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03994541 , version 1 (17-02-2023)

Identifiants

Citer

P J Cobelli, V. Pagneux, A. Maurel, P. Petitjeans. Experimental study on water-wave trapped modes. Journal of Fluid Mechanics, 2011, 666, pp.445-476. ⟨10.1017/S0022112010004222⟩. ⟨hal-03994541⟩
2 Consultations
33 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More