An explicit direct FEM–BEM coupling procedure for nonlinear dynamics.
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2019
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Resumo
In this work, an explicit direct FEM–BEM coupling procedure is proposed for nonlinear dynamics. In this procedure, each subdomain of the model is analysed separately taking into account proper interface conditions,
allowing optimized solver procedures to be applied within each subdomain. In addition, the solution procedure
is carried out directly (i.e., without any iterative process), since an explicit time-marching technique is employed
within the FEM subdomains. In this context, a locally stabilized central difference approach is utilized, ensuring
stability for the FEM analyses, as well as enhanced accuracy. Thus, a very efficient and versatile coupled solution
takes place, allowing the direct and independent solution of the subdomains of the model, without regarding
critical time-steps limitations within the explicit subdomains. A multi-level time-step algorithm is also considered here, enabling different time-steps to be applied to each subdomain of the model, further improving the
flexibility of the coupled analyses. At the end of the paper, numerical applications are presented, illustrating the
effectiveness and versatility of the proposed methodology.
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Finite elements, Boundary elements, FEM–BEM coupling, Explicit time-domain analysis, Stability
Citação
SOARES JÚNIOR, D.; ARAÚJO, F. C. de. An explicit direct FEM–BEM coupling procedure for nonlinear dynamics. Engineering Analysis with Boundary Elements, v. 103, p. 94-100, jun. 2019. Disponível em: <https://www.sciencedirect.com/science/article/pii/S0955799718307392>. Acesso em: 10 mar. 2020.