Direct numerical simulations of trailing-edge noise generated by turbulent boundary-layers

Sandberg, R.D. and Sandham, N.D. (2007) Direct numerical simulations of trailing-edge noise generated by turbulent boundary-layers. 45th AIAA Aerospace Sciences Meeting and Exhibit, Reno, USA. 08 - 11 Jan 2007. 15 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Direct numerical simulations (DNS) are conducted of turbulent flow passing an infinitely thin trailing edge (TE).The objective is to investigate the turbulent flow field in the vicinity of theTE and the associated broadband noise generation.To generate a turbulent boundary layer a short distance from the inflow boundary, a technique is employed which exploits the dynamical features of the outer and inner part of the boundary layer.The DNS data are Fourier transformed in time and point spectra at various locations are used to identify representative frequencies. Several flow quantities are visualized for these frequencies and compared to predictions made with an acoustic analogy and a modified version of Amiet's classical trailing edge noise theory. A rapid increase in skin friction and a decrease in boundary layer thickness is observed at the trailing edge, consistent with analytical predictions using triple deck theory, leading to suppression of very low frequencies as found from point spectra.

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