A Two-Dimensional Numerical Investigation of Aerodynamic Noise from an Inclined Plate

Direct computations of acoustic noise of flow over an inclined plate are performed at two Mach numbers by solving the compressible Navier-Stokes equations without invoking any form of modelling. The flat plate has a sharp leading edge and sharp trailing edge and is inclined at incidence of 20 degrees. The simulations are performed at a chord-based Reynolds number of 1000, and the freestream Mach numbers of 0.4 and 0.6. The numerical results reveal the effect of the Mach number on both of the hydrodynamic near-field and the acoustic far-field. Increasing the Mach number results in an increase in the shedding frequency and a decrease in the acoustic wavelength. The directivity plots show that additional lobes are present on the plate suction side at higher Mach number.