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Title: An efficient multi-time step FEM–SFEM iterative coupling procedure for elastic–acoustic interaction problems
Authors: Silva, JEA
Loureiro, FS
Mansur, WJ
Wrobel, LC
Keywords: Spectral finite element;Acoustic fluid;Elastodynamics;Multi-time stepping scheme;Iterative coupling
Issue Date: 2018
Publisher: Springer Verlag
Citation: Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2018, 40 (8)
Abstract: 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.
ISSN: 1678-5878
Appears in Collections:Dept of Mechanical Aerospace and Civil Engineering Embargoed Research Papers

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