J. Phys. IV France
Volume 04, Numéro C5, Mai 1994
3ème Congrés français d'acoustique
3rd French conference on acoustics
Page(s) C5-331 - C5-334
3ème Congrés français d'acoustique
3rd French conference on acoustics

J. Phys. IV France 04 (1994) C5-331-C5-334

DOI: 10.1051/jp4:1994568

A coupling procedure for modeling acoustic problems using finite elements and boundary elements


1  Numerical Integration Technologies, Ambachtenlaan 11 A, 3001 Leuven, Belgium
2  Thomson-Sintra ASM, 525 route des Dolines, BP. 157, 06903 Sophia-Antipolis cedex, France

Finite element (FEM) and boundary element (BEM) methods have been used for a long time for the numerical simulation of acoustic problems. The development presented in this paper deals with a general procedure for coupling acoustic finite elements with acoustic boundary elements in order to solve efficiently acoustic problems involving non homogeneous fluids. Emphasis is made on problems where finite elements are used for a confined (bounded) fluid while boundary elements are selected for an external (unbounded) fluid. The discrete sets of equations related to the two models are first summarized. An elimination procedure is then proposed for solving the coupled problem. This procedure enables to take care of the sparseness of the finite element matrix and leads to solve an updated boundary element system. The solution sequence allows for the treatment of multiple load cases (velocity boundary conditions) in order to generate mutual impedance coefficients.

© EDP Sciences 1994