Vibro-acoustic response of a flat plate under turbulent boundary layer excitation

A hybrid computational fluid dynamics-finite element method-boundary element method technique is used to predict the vibro-acoustic response of a flat plate in low Mach number flow. Reynolds- Averaged Navier-Stokes equations are used to estimate the turbulent boundary layer parameters over the surface of the flat plate. The cross spectrum density function of the turbulent boundary layer pressure is obtained as the result of a combination of uncorrelated wall pressure plane waves. A coupled finite and boundary element approach is adopted to compute the vibro-acoustic response of the flat plate from the synthesised wall pressure field corresponding to each realisation of uncorrelated wall plane waves. The response of the plate subject to turbulent boundary layer excitation is then obtained from an ensemble average of the different realisations. The proposed technique is computationally efficient and significantly reduces the memory requirement for predicting the vibro-acoustic response of a structure in turbulent flow.