@inproceedings{2bf72586923345de9883d9045a855e6b,
title = "Effect of porous surface on the flat plate self-noise",
abstract = "In this study, the effect of porous surface on the turbulent noise generated by a blunt trailing-edge of a flat plate is investigated. The three-dimensional turbulent flow over the flat plate (Rec=1. 3×105 and M=0.06) is computed by incompressible large eddy simulation (LES) based on the volume-averaged Navier-Stokes equations, while the acoustic field is calculated by the linearized perturbed compressible equations (LPCE) coupled with LES solutions. The porous surface is applied to a small, selected area near the trailing-edge, where the K{\'a}rm{\'a}n vortex shedding and eddy scattering produce dipole sounds. The computed results show that the trailing-edge with porosity ε=0.25 and permeability (normalized) K*=0.01 yields a reduction of tonal peak by 13dB for zero angle of attack (α=0°), via breaking not only in the streamwise direction but also in the spanwise direction the spatial correlation of the wall pressure fluctuations (Rpp) near the trailing-edge. For the separated flow case (α=5°), the same configuration of the porous surface is found to weaken the pressure fluctuations at the trailing edge. It results in 3-10dB noise reduction over a wide range of frequency, via reducing the separated flow region over the upper surface of the plate.",
author = "Youngmin Bae and Jeong, {Ye Eun} and Moon, {Young J.}",
year = "2009",
doi = "10.2514/6.2009-3311",
language = "English",
isbn = "9781563479748",
series = "15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference)",
publisher = "American Institute of Aeronautics and Astronautics Inc.",
booktitle = "15th AIAA/CEAS Aeroacoustics Conference (30th AIAA Aeroacoustics Conference)",
}