Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)This work presents further results of the effects of trailing edge bluntness on airfoil tonal noise generation and propagation at low and moderate Reynolds numbers. Here, several simulations are conducted for a NACA 0012 airfoil at different free-stream Mach numbers. The effects of compressibility on sound generation and propagation are analyzed along with the effects of scattering by blunt trailing edges with different radii of curvature. Sound generation is computed by a hybrid method and an accurate two-dimensional direct calculation, and results are compared. The hybrid approach uses direct calculation for near-field source computations and the Ffowcs Williams-Hawkings equation as the acoustic analogy formulation. Numerical results show that the airfoil emits an intense "narrowband" tone and that a thicker trailing edge emits higher noise levels than a thinner one since the magnitude of quadrupole sources are larger for the thicker configuration. At moderate Reynolds numbers, several tonal peaks are superimposed on a broadband spectrum for the thinner trailing edge investigated. For the blunter trailing edge, a tonal noise spectrum is shown. 141114222013/03413-4, FAPESP, Fundação de Amparo à Pesquisa do Estado de São Paulo2013/07375-0, FAPESP, Fundação de Amparo à Pesquisa do Estado de São Paulo2014/10166-6, FAPESP, Fundação de Amparo à Pesquisa do Estado de São PauloFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Arbey, H., Bataille, J., Noise generated by airfoil profiles placed in a uniform laminar flow (1983) Journal of Fluid Mechanics, 134, pp. 33-47Arias Ramirez, W., Wolf, W.R., Effects of trailing edge bluntness on airfoil tonal noise at low reynolds numbers (2015) Journal of the Brazilian Society OfMechanical Sciences and EngineeringBeam, R.M., Warming, R.F., An implicit factored scheme for the compressible navier-stokes equations (1978) AIAA Journal, 16 (4), pp. 393-402Brooks, T.F., Pope, D.S., Marcolini, M.A., Airfoil self-noise and prediction (1989) Tech. Rep., NASADesquesnes, G., Terracol, M., Sagaut, P., Numerical investigation of the tone noise mechanism over laminar airfoils (2007) Journal of Fluid Mechanics, 591, pp. 155-182Hutcheson, F., Brooks, T., Effects of angle of attack and velocity on trailing edge noise (2004) 42nd AIAA Aerospace Sciences Meeting and Exhibit, Aerospace Sciences MeetingsLele, S.K., Compact finite difference schemes with spectral-like resolution (1992) Journal of Computational Physics, 103 (1), pp. 16-42. , http://dx.doi.org/10.1016/0021-999192)90324-RNagarajan, S., Lele, S.K., Ferziger, J.H., A robust high-order compact method for large eddy simulation (2003) Journal of Computational Physics, 191 (2), pp. 392-419. , http://dx.doi.org/10.1016/S0021-999103)00322-XNash, E., Lowson, M., Mcalpine, A., Boundary-layer instability noise on aerofoils (1999) Journal of Fluid Mechanics, 382, pp. 27-61Paterson, R., Vogt, P., Fink, M., Munch, C., Vortex noise of isolated airfoils Journal of Aircraft, 10, pp. 296-302Tam, C., Ju, H., Airfoil tones at moderate reynolds number: A computational study (2011) Proceedings of the 17th AIAA/CEAS Aeroacoustics Conference (32nd AIAA Aeroacoustics Conference), , Portland, OregonWolf, W.R., Azevedo, J.L.F., Lele, S.K., Convective effects and the role of quadrupole sources for aerofoil aeroacoustics (2012) Journal of Fluid Mechanics, 708, pp. 502-538Wolf, W.R., Lele, S., Acoustic analogy formulations accelerated by fast multipole method for two-dimensional (2010) AIAA Journal, 48, pp. 2274-22851st Pan-American Congress on Computational Mechanics, PANACM 2015 and the 11th Argentine Congress on Computational Mechanics, MECOM 201527 April 2015 through 29 April 2015