Last modified: 2015-06-19
Abstract
The paper introduces a coupling FEM-BEM procedure for solving elastodynamic frequency domain problems. Emphasis is given to infinite domain analyses, including discrete complex heterogeneous regions, rendering a configuration in which neither the Finite Element Method (FEM) nor the Boundary Element Method (BEM), isolated, is ideally suited for the complete numerical analysis. In this case, the coupling of these methodologies is recommended, allowing for the exploration of their respective intrinsic advantages. The elastodynamic multi domain interaction is carried out here by an optimized iterative coupling procedure. This coupling technique allows for independent discretization strategies, not even needing to include matching interface nodes between methods, leading to a best of both worlds approach. In addition, optimal relaxation parameters are computed, in order to improve convergence of the iterative procedure, properly dealing with possible frequency domain ill-posed problems.