Scattering of sound by a vorticity filament: An experimental and numerical investigation

Sébastien Manneville (1) , Philippe Roux (2) , Mickaël Tanter (3) , Agnès Maurel (3) , Mathias Fink (3) , Frédéric Bottausci (4) , Philippe Petitjeans (4)

1 Phys-ENS - Laboratoire de Physique de l'ENS Lyon
2 UMR ITAP - Information – Technologies – Analyse Environnementale – Procédés Agricoles
3 LOA - Laboratoire Ondes et Acoustique (UMR 7587)
4 PMMH - Physique et mécanique des milieux hétérogenes (UMR 7636)

A vorticity filament is investigated experimentally using the transmission of an ultrasonic wave through the flow. The analysis of the wave-front distortion provides noninvasive measurements of the vortex circulation and size. The latter is estimated by analytical calculations of the scattering of a plane wave by a vorticity filament. The case of a cylindrical wave incident on a vortex leads to similar experimental results which are successfully compared to a parabolic equation simulation. Finally, a finite-difference code based on linear acoustics is presented, in order to investigate the structure of the scattered wave numerically.

Domains: Fluids mechanics [physics.class-ph]; Acoustics [physics.class-ph]

Sébastien Manneville, Philippe Roux, Mickaël Tanter, Agnès Maurel, Mathias Fink, et al.. Scattering of sound by a vorticity filament: An experimental and numerical investigation. Physical Review E , 2001, 63 (3), ⟨10.1103/PhysRevE.63.036607⟩. ⟨hal-02454239⟩