Fluid-Structure-Acoustic coupling analysis for external laminar and turbulent fluid flows

Controlling noise pollution is one of the most crucial parameters in various industries. The use of elastic plates has a substantial impact on noise pollution control and associated factors, such as transmission loss. Additionally, the transmission loss is affected by geometric variations. However, the effect of a rib and elastic plate on the acoustic properties of a channel for a wide range of Reynolds numbers has not yet been investigated, although their use could reduce noise pollution. This study thus investigates the acoustic and flow impacts of a rib and an elastic plate. The control variables for fluid-structure-acoustic coupling numerical simulations are rib height, rib angle, elastic plate length, elastic plate position, Reynolds number, and the Young module of the elastic plate. The governing equations are discretized using the Galerkin method. The results indicate that the transmission loss is 27% more at the elastic plate's highest position. By decreasing the length of the elastic plate by 50%, the mean transmission loss is reduced by 9%. The findings of this study can be utilized by mechanical and aerospace engineers in the design of aircraft, automobiles, and cooling and heating systems, particularly fan coils.