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Institute Jean le Rond d’Alembert Mechanics, Acoustics, Energetics

Institute Jean le Rond d’Alembert Mechanics, Acoustics, Energetics. Univ. Paris 6 - UPMC and CNRS, Paris and Saint-Cyr l’École http://www.dalembert.upmc.fr. A hundred staff members in five teams : Complex Fluids and Hydrodynamic Instabilities FCIH Reacting Fluids and Turbulence FRT

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Institute Jean le Rond d’Alembert Mechanics, Acoustics, Energetics

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  1. Institute Jean le Rond d’Alembert Mechanics, Acoustics, Energetics Univ. Paris 6 - UPMC and CNRS, Paris and Saint-Cyr l’École http://www.dalembert.upmc.fr A hundred staff members in five teams : Complex Fluids and Hydrodynamic Instabilities FCIH Reacting Fluids and Turbulence FRT Lutheries, Acoustics, Music LAM Modelling, Propagation and Acoustic Imaging MPIA Mechanics and Engineering of Solids and Structures MISES Director: Stéphane Zaleski UMR 7190

  2. FCIH: Complex Fluids and Hydrodynamic Instabilities Head: Maurice Rossi Fluid mechanics in complex configurations, instabilities, two-phase flow, granular media. Droplet impact on a liquid layer Helical vortices (occurs in helicopter-blade wakes, windmills) Fluid biomechanics: Modeling sleep apnea Granular flow

  3. FRT : Reacting Fluids and Turbulence Head: Pierre Sagaut Large eddy simulation, internal combustion engines, uncertainty propagation. Vorticity field arising from radiated acoustic pressure numerical simulation Distribution of the probability density function of a mixing layer in presence of uncertainty. Identification of acoustic sources by time reversal. A 2D forced mixing layer. The effect of the forcing amplitude is shown. Rapid Compression Device (St Cyr) The inset shows chemoluminescence data that track the emission of free radicals in the reacting zone.

  4. LAM : Lutheries, Acoustics, Music Head: Hugues Genevois Acoustical, mechanical, and social science studies of music and sound. Use of a time reversal mirror to focus on the harmony table The identification of relevant parameters for the quality of musical instruments (violins, flutes, harpsichords) relies on specific techniques. . Nozzle loudspeaker enclosure These shapes are motivated by the need to minimize the sound distortion by jets and vortices. Sound recording in urban environment Correlating sound and measurement is of particular interest here.

  5. MPIA : Modelling, Propagation and Acoustic Imaging Head: Bernard Collet wave propagation in radom media, nonlinear waves, vibration, underwater imaging, time reversal. Reconstructing the vorticity field in the wake of a delta wing by acoustic tomography Acoustic rays contain information about the media they travel in, here vorticity is reconstructed. Plate with piezolelectric transducers The goal is to limit acoustic radiation using active devices. Wave fronts on the surface of a copper cristal. Comparison of Theory and Experiment. Wavespeeds and wavefronts on the surface of a cristal are predicted and measured. Numerical simulation of an acoustic shock wave near a fold caustic.

  6. MISES : Mechanics and Engineering of Solids and Structures Head: Sébastien Neukirch damage, rupture, slender elastic bodies, structural optimization. Ductile fracture Spontaneous spiraling of slender elastic bodies Localisation of micro-stresses in concrete or injected sand. Optimisation of composite materials

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