Abstract
We study the coupling between an acoustically loaded flexible plate and the surrounding fluid. We consider two cases: (i) a viscous boundary layer flow is established over the flexible plate, and (ii) the fluid is assumed to be inviscid and excited only by the motion of the flexible plate. In both cases, the evolution of the fluid flow determines the pressure in the fluid which in turn is employed as a source term for the motion of the flexible plate. In the case that the flexible plate oscillates in a viscous boundary layer, we find an increase in disturbance amplitude and vorticity production as well as the formation of transient inflection points in the streamwise velocity field. In the case of an inviscid fluid excited by the motion of the plate, we find that the coupling acts as a stabilizing mechanism so that for a given acoustic loading the nonlinear response of the plate is reduced over the case where the fluid motion is decoupled from the plate response. When the acoustic loading is large, high frequencies tend to predominate as the pressure disturbance is propagated into the far field, leading to a progressive steepening in the pressure disturbance with distance from the flexible plate.
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