Abstract
*** † Turbulence trailing-edge noise at low Mach numbers is computationally predicted by the linearized perturbed compressible equations(LPCE), based on solutions of incompressible large eddy simulation(LES) for a turbulent boundary layer past the trailing-edge at Re=1350 based on the momentum thickness. The total derivatives of hydrodynamic pressure act as noise sources in the acoustic formulation, which is computed by a sixth-order compact spatial discretization scheme and a four-stage Runge-Kutta time advancing method. Statistical properties of turbulent boundary layer are examined with spectral analysis of wall pressure fluctuations, and the acoustic field is analyzed with cross spectral data of acoustic properties, in order to identify the trailing-edge noise sources. The broadband noise spectra obtained by LPCE are compared with the analytical predictions of Howe and Casper & Farassat.
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