Topological sensitivity and FMM-accelerated BEM applied to 3D acoustic inverse scattering
نویسندگان
چکیده
منابع مشابه
Topological sensitivity and FMM-accelerated BEM applied to 3D acoustic inverse scattering
This study is set in the framework of inverse scattering of scalar (e.g. acoustic) waves. A qualitative probing technique based on the distribution of topological sensitivity of the cost functional associated with the inverse problem with respect to the nucleation of an infinitesimally-small hard obstacle is formulated. The sensitivity distribution is expressed as a bilinear formula involving t...
متن کاملFMM accelerated BEM for 3D Laplace & Helmholtz equations
We describe development of a fast multipole method accelerated iterative solution of boundary element equations for large problems involving hundreds of thousands elements for the Laplace and Helmholtz equations in 3D. The BEM requires several approximate computations (numerical quadrature, approximations of the boundary shapes using elements) and the convergence criterion for iterative computa...
متن کاملA particle accelerated CFD-BEM technique applied to aeroacoustic scattering
A particle accelerated computational fluid dynamics (CFD) boundary element method (BEM) technique is proposed that allows the total sound pressure field produced by low Mach number flow past a rigid body to be predicted. An incompressible CFD solver is used to calculate the transient hydrodynamic flow field. The CFD/BEM coupling technique is then used to compute the acoustic pressure and pressu...
متن کاملTopological sensitivity for 3D elastodynamic and acoustic inverse scattering in the time domain
Building on previous work for 3D inverse scattering in the frequency domain, this article develops the concept of topological derivative for 3D elastic and acousticwave imaging of media of arbitrary geometry using data in the time domain. The topological derivative, which quantifies the sensitivity of the cost functional associated with the inverse scattering problem due to the creation at a sp...
متن کاملA High-frequency Bem for 3d Acoustic Scattering
The Boundary Element Method (BEM) is a powerful method for simulating scattering of acoustic waves which has many advantages, particularly when the problem concerns an object in an unbounded medium. Its applications are however limited in practice because standard schemes have a computational cost which grows extremely quickly as size and frequency is increased. Fundamentally this occurs becaus...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Engineering Analysis with Boundary Elements
سال: 2008
ISSN: 0955-7997
DOI: 10.1016/j.enganabound.2007.02.006