Nonlinear disturbance evolution in a boundary layer along an elastic plate and induced radiated sound
Language
en
Article de revue
This item was published in
European Journal of Mechanics - B/Fluids. 2010-03, vol. 29, n° 2, p. 105-118
Elsevier
English Abstract
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 ...Read more >
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 assumptionsRead less <
English Keywords
Boundary-layer flow over flexible plates
Numerical simulation
Radiated sound
Lighthil's analogy
Origin
Hal imported