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Wave-obstacle interaction in a lossy medium: energy perturbations and negative extinction |
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| Authors: | N Brauner and A I Beltzer |
| Institution: | † Department of Fluid Mechanics and Heat Transfer, Tel-Aviv University, Israel †† Department of Mechanical Engineering, University of Alberta, Edmonton, Canada |
| Abstract: | The concept of a generalized extinction cross-section introduced in a previous paper is given in detail and exemplified by the problem of scattering by an elastic cylinder embedded in a viscoelastic matrix. It is shown that under certain conditions the presence of inclusion may have a supporting effect on wave propagation (negative extinction). The derived low-frequency expansions indicate that the Rayleigh law may not hold in the case of a lossy medium. Numerical results as well as discussions concerning separation between scattering and intrinsic viscoelastic losses are also given. |
| Keywords: | wave scattering viscoelastic losses inclusions |
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