GOBERT, Marie-Laure; EHRENSTEIN, Uwe; ASTOLFI, André; BOT, Patrick

doi:10.1016/j.euromechflu.2009.12.001

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GOBERT, Marie-Laure
Institut de Recherche de l'Ecole Navale [IRENAV]

EHRENSTEIN, Uwe
Institut de Recherche sur les Phénomènes Hors Equilibre [IRPHE]

ASTOLFI, André
Institut de Recherche de l'Ecole Navale [IRENAV]

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European Journal of Mechanics - B/Fluids. 2010-03, vol. 29, n° 2, p. 105-118

Elsevier

Résumé en anglais

The interaction between a boundary-layer flow and an elastic plate is addressed by direct numerical simulation, taking into account the full coupling between the fluid flow and the flexible wall. The convectively unstable flow state is harmonically forced and two-dimensional nonlinearly saturated wavelike disturbances are computed along archetype-plates with respect to stiffness and natural frequencies. In the aim of determining the low-Mach-number radiated sound for the system, the simulation data are used to solve the Lighthill’s equation in terms of a Green’s function in the wavenumber-frequency space.Different degrees of fluid-structure coupling are implemented in the radiated sound model and the resulting acoustic pressure levels are compared. The sound radiation levels are shown to be increased in the presence of flexible walls with however significant differences in the radiated pressure levels for different coupling assumptions< Réduire

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Boundary-layer flow over flexible plates

Numerical simulation

Radiated sound

Lighthil's analogy

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Nonlinear disturbance evolution in a boundary layer along an elastic plate and induced radiated sound

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