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Etude numérique de l'interaction tourbillons-ondes acoustiques

Abstract : The purpose of this work is to study the interaction between a flow and an incident sound wave in water. The incoming wave is scattered mainly by the flow vortices, so acoustic scattering can be used as a way of non-intrusive measurement for rotational flows. In the first part, we study the theory of the sound – vortex interaction, and we explain how we resolve the induced Neumann problem and compute the scattered acoustic pressure by using a Boundary Element Method (BEM). The link is made with works by Lund & Rojas who gave an analytical formulation linking scattered pressure to vorticity in the Fourier space. In connection with experimental studies, we show how it is possible to recover some fundamental characteristics of the flow by analysing the scattered pressure in the case of a Von Karman vortex street, thanks to an optical analogy with a diffraction grating. Further validation of our scattering calculation code is then obtained in the cases of a vortex street computed by using an analytical model, a discrete vortex method or a finite volume calculation. The acoustic characterisation method is then applied to the case of a single vortex. We show that the scattered wave pressure leads to some major vortex characteristics such as the core size, the vortex intensity or speed. Then, the pressure scattered by a wing tip vortex is investigated using a finite volume method for the flow simulation. Finally, we study an analytical model of a more complex rotational flow modelling the wake past a submarine. The relative effects of the vortex rings shed from the hull and a central three dimensional vortex shed from the propeller are studied.
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Contributor : Denis Tschumperlé <>
Submitted on : Thursday, February 12, 2004 - 5:45:25 PM
Last modification on : Wednesday, February 26, 2020 - 7:06:07 PM
Long-term archiving on: : Wednesday, September 12, 2012 - 1:20:30 PM

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Denis Tschümperlé. Etude numérique de l'interaction tourbillons-ondes acoustiques. Dynamique des Fluides [physics.flu-dyn]. Université du Havre, 2000. Français. ⟨tel-00004646⟩

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