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| HAL : hal-00373761, version 1 |
| DOI : 10.1121/1.2935660 |
| Fiche détaillée |  Récupérer au format |
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| The Journal of the Acoustical Society of America 123, 5 (2008) 3845 |
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| Comparisons between multiple scattering methods and time-domain numerical simulations for elastic waves |
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| Mathieu Chekroun 1Loïc Le Marrec 2 |
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| (2008) |
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| Propagation of elastic waves in heterogeneous medium composed of scatterers embedded in a homogeneous matrix is considered. Both matrix and scatterers are isotropic elastic media. The multiple scattering regime is assumed, and the focus is put on the coherent field obtained by averaging several equivalent realizations of disorder. Classical methods, such as Independent Scattering Approximation, Foldy or Waterman-Truell's model, provide expressions of the complex effective wave number of the coherent field, leading to an effective phase velocity and effective damping factor. Two-dimensional time-domain numerical simulations are performed for studying the validity of these analytical or semianalytical methods. To reduce spurious effects, such as numerical diffraction, to a negligible level, a high-order numerical scheme and an immersed interface method are used together. Comparisons between theoretical and numerical values of the effective phase velocity and damping factor are proposed and analyzed in terms of the frequency, the scatterer density, and the propagation length. |
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| 1 : | EDF R&D - LCPC |
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EDF Recherche et Développement |
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| 2 : | Institut de Recherche Mathématique de Rennes (IRMAR) |
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CNRS : UMR6625 – Université de Rennes 1 – École normale supérieure de Cachan - ENS Cachan – Institut National des Sciences Appliquées (INSA) : - RENNES – Université de Rennes II - Haute Bretagne |
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| 3 : | Laboratoire de Mécanique et d'Acoustique (LMA) |
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CNRS : UPR7051 |
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| 4 : | Laboratoire Central des Ponts et Chaussées (LCPC) |
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LCPC |
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| Domaine | : | Physique/Mécanique/Acoustique Sciences de l'ingénieur/Acoustique |
| hal-00373761, version 1 | |
| http://hal.archives-ouvertes.fr/hal-00373761 | |
| oai:hal.archives-ouvertes.fr:hal-00373761 | |
| Contributeur : Maryse Collin | |
| Soumis le : Mardi 7 Avril 2009, 11:53:13 | |
| Dernière modification le : Lundi 26 Avril 2010, 15:03:02 | |
