[en] The direct numerical simulation of the acoustic wave scattering created by very small obstacles is very expensive, especially in three dimensions and even more so in time domain. The use of asymptotic models is very efficient and the purpose of this work is to provide a rigorous justification of a new asymptotic model for low-cost numerical simulations. This model is based on asymptotic near-field and far-field developments that are then matched by a key procedure that we describe and demonstrate. We show that it is enough to focus on the regular part of the wave field to rigorously establish the complete asymptotic expansion. For that purpose, we provide an error estimate which is set in the whole space, including the transition region separating the near-field from the far-field area. The proof of convergence is established through Kondratiev's seminal work on the Laplace equation and involves the Mellin transform. Numerical experiments including multiple scattering illustrate the efficiency of the resulting numerical method by delivering some comparisons with solutions computed with a finite element software.
Disciplines :
Mathematics Computer science
Author, co-author :
Barucq, Hélène; Magique 3D, INRIA, E2S-UPPA, LMAP UMR CNRS 5142, Pau, France
Diaz, Julien; Magique 3D, INRIA, E2S-UPPA, LMAP UMR CNRS 5142, Pau, France
Mattesi, Vanessa ; Université de Liège - ULiège > Montefiore Institute of Electrical Engineering and Computer Science
Tordeux, Sebastien ; Magique 3D, INRIA, E2S-UPPA, LMAP UMR CNRS 5142, Pau, France
Language :
English
Title :
Asymptotic behavior of acoustic waves scattered by very small obstacles
Publication date :
2021
Journal title :
ESAIM: Mathematical Modelling and Numerical Analysis
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