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[00844] Evidence of Multiple Effective Wavenumbers in Isotropic Random Particulate Materials

  • Session Time & Room : 5C (Aug.25, 13:20-15:00) @E817 A715
  • Type : Contributed Talk
  • Abstract : In random particulate materials, it is generally assumed that if we average over all particle configurations, the averaged wave field satisfies the wave equation with a unique effective wavenumber k∗. As the medium is homogeneous and isotropic - because the particles have no specific orientation or direction - it is reasonable to assume the presence of one effective wavenumber. However, recent work theoretically predicted the existence of at least two (complex) effective wavenumbers for one fixed frequency. A phenomenon normally observed only in anisotropic media. Our goal is to find clear evidence of these wavenumbers using the Monte-Carlo approach and show how they influence the total field.
  • Classification : 74J20, 74A40, 78A48, 82D30, 82M31, wave scattering, multiple scattering, random media, ensemble averaging, Monte Carlo methods
  • Format : Talk at Waseda University
  • Author(s) :
    • Aristeidis Karnezis (The University of Sheffield)
    • Artur Lewis Gower (The University of Sheffield)