On the Aerodynamic-Noise Sources in a Circular Cylinder Coated with Porous Materials

Coating a circular cylinder with porous materials constitutes an effective passive strategy for reducing the flow-induced noise linked to the vortex shedding. Despite the number of investigations in the last decade, the noise-mitigation mechanisms associated with this technique remain unclear. The present research aims to clarify the role played...

3D-printed Perforated Trailing Edges for Broadband Noise Abatement

Turbulent boundary layer trailing-edge noise scattered by a NACA0018 airfoil equipped with 3D printed perforated trailing-edge inserts, i.e. with straight cylindrical channels connecting the two sides of the airfoil, is investigated. The inserts have different permeability in order to assess the effect of this property on broadband noise...

Broadband Trailing-Edge Noise Reduction Using Permeable Metal Foams