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Structuration of the water surface for the study of ultrasonic wave diffraction by Dirichlet surface gratings

PhD position
3 years

The usual boundary conditions encountered in acoustic and more particularly for acoustic wave propagating in the air medium are of Neumann (zero normal velocity) or Robin (mixing pressure and velocity) types. The Dirichlet condition is more rarely encountered, although an often used Mathematical object. This condition is nevertheless naturally and rigorously realized when an acoustic wave initially propagating in a heavy fluid impingies an interface with a light fluid: this is the case, for example, of the water/air interface. This thesis focuses on the study of the interaction of an ultrasonic wave propagating initially in water with the water / air interface and more particularly when this interface is structured to form a possibly resonant diffraction grating. It will focus on the understanding of the predicted physical phenomena and its validation by experimental results obtained in water tank.


 During the thesis, theoretical tools will be developed to control the diffusion by different networks of resonant diffusers on the basis of the theory of multiple diffusion, modal decomposition and numerical simulations. Diffusion by such systems can be controlled by optimizing the position and shape of the diffusers.

4/12/19 12:00 PM
PDF document PhD_WATERINTERFACE_Offre_Anglais.pdf — PDF document, 73 KB

Vicent Romero García (vicente.romero@univ-lemans-fr)
Jean-Philippe Groby (Jean-Philippe.Groby@univ-lemans.fr)
Aroune Duclos (aroune.duclos@univ-lemans.fr)