2 research outputs found
An efficient multi-time step FEM–SFEM iterative coupling procedure for elastic–acoustic interaction problems
An iterative coupling methodology between the Finite Element
Method (FEM) and the Spectral Finite Element Method (SFEM) for the modeling
of coupled elastic-acoustic problems in the time domain is presented here.
Since the iterative coupling procedure allows the use of a nonconforming mesh
at the interface between the subdomains, the difference in the element sizes
concerning the FEM and SFEM is handled in a straightforward and efficient
manner, thereby retaining all the advantages of the SFEM. By means of the
HHT time integration method, controllable numerical damping can be introduced
in one of the subdomains, increasing the robustness of the method and
improving the accuracy of the results; besides, independent time-step sizes can
be considered within each subdomain, resulting in a more efficient algorithm.
In this work, a modification in the subcycling procedure is proposed, ensuring
not only an efficient and accurate methodology but also avoiding the computation
of a relaxation parameter. Numerical simulations are presented in order
to illustrate the accuracy and potential of the proposed methodology.CAPES, UFJF, UFSJ, FAPEMIG and CNP