Acoustic Lagrangian measurements EuHIT Funded Project

Team

Christophe Baudet
University Grenoble I, Grenoble, France
Mathieu Gibert
CNRS, Grenoble, France
Nicolas Mordant
Université Joseph Fourier, Grenoble, France

Overview

Research Infrastructure
Max Planck High-Turbulence Facility, Germany
Facilities used
Variable Density Turbulence Tunnel (GTF1)
Project leader
Mickael Bourgoin
LEGI - CNRS, Grenoble, France

Abstract

Acoustic particle tracking (APT) is a scattering technique based on Doppler velocimetry that directly gives particles velocities (in contrast to classical optical PTV which gives particles positions) without need of signal differentiation, and so has a high SNR. Another benefit of APT is that only one “pixel” (which is here one acoustic receiver) is required to determine each velocity component of a particle. This reduces significantly the amount of raw data that must be processed with the caveat that not so many particles can be tracked simultaneously. An interesting aspect of APT is that by changing the scattering angle and the signal processing, the same apparatus can be used to measure the 3D spectral modes of the vorticity field in turbulent flows without the need of seeding particles (turbulent vortices act themselves as acoustic scatterers). The present project aims at implementing such a 3D-APT technique in GTF1.