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@ARTICLE{Koh:858009,
      author       = {Koh, Seong-Ryong and Zhou, Beckett and Meinke, Matthias and
                      Gauger, Nicolas and Schröder, Wolfgang},
      title        = {{N}umerical analysis of the impact of variable porosity on
                      trailing-edge noise},
      journal      = {Computers $\&$ fluids},
      volume       = {167},
      issn         = {0045-7930},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2018-06953},
      pages        = {66 - 81},
      year         = {2018},
      abstract     = {The impact of porous material with variable properties on
                      trailing-edge noise is analyzed by a high resolution
                      large-eddy simulation/computational aeroacoustics (LES/CAA)
                      approach. Two trailing edge shapes, i.e., a sharp edge and a
                      rounded edge, with solid and porous surfaces are considered.
                      The numerical solution of the rounded corner trailing edge
                      is validated by experimental data of surface pressure and
                      acoustic spectra. The viscous dissipation in the porous
                      structures directly influences the acoustic attenuation by
                      reducing the correlation length of the turbulent eddies and
                      the flow acceleration near the trailing edge. At zero
                      angle-of-attack the porous surface is extremely effective to
                      reduce the tone and the broadband noise. An optimized
                      porosity distribution further decreases the tone amplitude.
                      At increasing angle-of-attack the enhanced flow momentum in
                      the direction of streamline curvature enlarges the turbulent
                      length scale and the maximum turbulence intensity. The
                      acoustic field of the porous trailing edges is dominated by
                      a large turbulent scale enhanced by the streamline curvature
                      variation. The low-frequency acoustics increases and its
                      wave propagation is more pronounced in the downstream
                      direction. Nevertheless, the porous trailing edge is an
                      effective means to lower the noise by 4 dB reduction in the
                      upstream direction.},
      ddc          = {004},
      pnm          = {899 - ohne Topic (POF3-899) / Simulation of Particulate
                      Flows, Base-Flow Fields of Space Launchers, and Trailing
                      Egde Noise $(hac31_20170501)$},
      pid          = {G:(DE-HGF)POF3-899 / $G:(DE-Juel1)hac31_20170501$},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1016/j.compfluid.2018.02.015},
      url          = {https://juser.fz-juelich.de/record/858009},
}