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@ARTICLE{Koh:858007,
      author       = {Koh, Seong Ryong and Meinke, Matthias and Schröder,
                      Wolfgang},
      title        = {{N}umerical analysis of the impact of permeability on
                      trailing-edge noise},
      journal      = {Journal of sound and vibration},
      volume       = {421},
      issn         = {0022-460X},
      address      = {London},
      publisher    = {Academic Press},
      reportid     = {FZJ-2018-06951},
      pages        = {348 - 376},
      year         = {2018},
      abstract     = {The impact of porous surfaces on the near-wall turbulent
                      structures and the generated trailing-edge noise is analyzed
                      for several trailing-edge shapes of finite thickness using a
                      high resolution large-eddy simulation (LES)/computational
                      aeroacoustics (CAA) method. The porous surface of the
                      trailing edge is defined by the porosity and the viscous
                      permeability determined by the solution of a turbulent flat
                      plate boundary layer at a Reynolds number 1280 based on the
                      displacement thickness in the inflow cross section. The
                      volume-averaged approach for the homogeneous porous medium
                      shows that the porous impedance scales linearly with the
                      porosity and exponentially with the mean structure size of a
                      porous medium. The drag induced by the porous surface
                      changes the friction velocity and the permeability Reynolds
                      number which determines the porous impedance scaled by . The
                      trailing-edge noise is analyzed for three solid and three
                      porous trailing edges. The effect of a finite span is
                      investigated by the spanwise correlation model based on the
                      measured coherence distribution. The acoustic prediction
                      shows a good agreement with measurements of the broadband
                      spectrum and the strong tone generated by a finite
                      trailing-edge thickness. The pressure gradient inside the
                      porous media is redistributed by the Darcy drag defined by
                      the viscous permeability and the porosity. The mean pressure
                      increases in the upstream direction inside the porous medium
                      such that the flow acceleration involved in the acoustic
                      generation is reduced inside the porous medium. The noise
                      reduction by a porous medium reaches 11 dB for the
                      trailing-edge shape which possesses a sharp corner for the
                      solid surface. The porous surface applied to a semi-circular
                      trailing edge achieves a 4 dB noise reduction. The
                      directivity pattern for individual components of the
                      acoustic spectrum shows that the massive noise reduction is
                      determined at the tone. Enhanced wave diffraction by the
                      thick flat plate changes the directivity pattern in the high
                      frequency range.},
      ddc          = {530},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1016/j.jsv.2018.02.017},
      url          = {https://juser.fz-juelich.de/record/858007},
}