A Posteriori Error Estimates and a Local Refinement Strategy for a Finite Element Method to Solve Structural-Acoustic Vibration Problems |
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Authors: | Alonso Ana Russo Anah Dello Padra Claudio Rodrguez Rodolfo |
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Institution: | (1) Departamento de Matemática, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, C.C. 172, 1900 La Plata, Argentina;(2) Centro Atómico Bariloche, 8400 Bariloche, Río Negro, Argentina;(3) Departamento de Ingeniería Matemática, Universidad de Concepción, Casilla 160-C, Concepción, Chile |
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Abstract: | This paper deals with an adaptive technique to compute structural-acoustic vibration modes. It is based on an a posteriori error estimator for a finite element method free of spurious or circulation nonzero-frequency modes. The estimator is shown to be equivalent, up to higher order terms, to the approximate eigenfunction error, measured in a useful norm; moreover, the equivalence constants are independent of the corresponding eigenvalue, the physical parameters, and the mesh size. This a posteriori error estimator yields global upper and local lower bounds for the error and, thus, it may be used to design adaptive algorithms. We propose a local refinement strategy based on this estimator and present a numerical test to assess the efficiency of this technique. |
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Keywords: | fluid– structure interaction displacement formulation spurious-modes free FEM adaptive mesh refinement |
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