Role of hydrodynamic and acoustic pressures in trailing-edge noise using numerical and analytical approaches

While the scattering of turbulent flows by an edge radiates sound waves into the far field, the roles of hydrodynamic and acoustic pressures remain unclear. This study examines these components to elucidate their roles and characteristics, focusing on trailing-edge noise through numerical and analytical approaches. Hydrodynamic pressure, characterized by streamwise turbulence, exhibits out-of-phase and incoherent behavior along the wall, forming pseudo-sound sources. In contrast, scattered acoustic pressure, governed by spanwise-coherent structures with weak energy and in-phase waves along the wall, is responsible for far-field sound radiation.