Journal ArticleDOI
Propagation of sound through a turbulent vortex
R. Labbé,Jean-François Pinton +1 more
TLDR
In this article, sound propagation in the bulk of a homogeneous flow made of a single intense vortex in air is studied using an adaptive-coherent average technique, and the mean amplitude and phase of the distorted wave fronts are reconstructed.Abstract:
We report an experimental study of sound propagation in the bulk of a homogeneous flow made of a single intense vortex in air. By using an adaptive-coherent average technique, the mean amplitude and phase of the distorted wave fronts are reconstructed. A large phase shift is observed on the wave fronts on either side of the ``shadow'' region behind the vortex. The shape of the averaged amplitude, as a function of space coordinates, shows that caustics are also formed in the acoustic field. In a nonstationary flow, these effects make it possible to monitor the vortex strength and position.read more
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Journal ArticleDOI
Scattering of acoustic waves by a vortex
TL;DR: In this article, the authors investigated the scattering of a plane acoustic wave by an axisymmetric vortex in two dimensions, where the wavelength of the acoustic wave is assumed to be much longer than the scale of the vortex.
Journal ArticleDOI
Ultrafast two-dimensional ultrasonic speckle velocimetry: A tool in flow imaging
TL;DR: In this paper, a technique for imaging fluid flows is proposed, based on the ultrafast analysis of the ultrasonic speckle signal backscattered by particles following the flow, which provides two-dimensional measurements of one component of the fluid velocity field at about 5000 frames per second.
Journal ArticleDOI
Surface wave scattering by a vertical vortex and the symmetry of the aharonov-bohm wave function
TL;DR: In this article, surface waves interacting with a vertical vortex are studied both analytically and experimentally and there are similarities as well as differences with the Aharonov-Bohm effect: a dislocation in the wave fronts that is proportional to the vortex circulation, and a significant change in the symmetry of the scattered wave.
Journal ArticleDOI
Vortex dynamics investigation using an acoustic technique
TL;DR: In this article, a double time-reversal mirrors system was used to study a vortical flow and the interaction between the sound and a vortex was described in details.
Journal ArticleDOI
Three-dimensional acoustic scattering by vortical flows. I. General theory
TL;DR: In this paper, the authors used matched asymptotic expansions to show that the acoustic analogy approximation always predicts the leading-order scattered sound field correctly, provided the Mach number of the vortex is small, and the acoustic wavelength is a factor of order M ⫺1 larger than the scale of a vortex.