An Error Estimator for the Finite Element Approximation of Plane and Cylindrical AcousticWaves

This paper deals with a Finite Element Method (FEM) for the approximation of the Helmholtz equation for two dimensional problems. The acoustic boundary conditions are weakly posed and an auxiliary problem with homogeneous boundary conditions is defined. This auxiliary approach allows for the formula...

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Bibliographic Details
Published in:Computer modeling in engineering & sciences Vol. 106; no. 2; pp. 127 - 145
Main Authors: Sebold, J E, Lacerda, L A, Carrer, J A M
Format: Journal Article
Language:English
Published: Henderson Tech Science Press 01.01.2015
Subjects:
Approximation
Boundary conditions
Dispersion (wave)
Errors
Finite element method
Grid refinement (mathematics)
Helmholtz equations
Mathematical analysis
Mathematical models
Nonlinear programming
Pade approximation
Parameters
Parametric analysis
Robustness (mathematics)
Tolerances
ISSN:1526-1492, 1526-1506
Online Access:Get full text
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Summary:This paper deals with a Finite Element Method (FEM) for the approximation of the Helmholtz equation for two dimensional problems. The acoustic boundary conditions are weakly posed and an auxiliary problem with homogeneous boundary conditions is defined. This auxiliary approach allows for the formulation of a general solution method. Second order finite elements are used along with a discretization parameter based on the fixed wave vector and the imposed error tolerance. An explicit formula is defined for the mesh size control parameter based on Padé approximant. A parametric analysis is conducted to validate the rectangular finite element approach and the mesh control parameter. The results of the examples show that the discrete dispersion relation (DDR) can be used for the rectangular finite element mesh refinement under predefined error tolerances. It is also shown that the numerical formulation is robust and can be extended to higher order finite element analyses.
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ISSN:1526-1492
1526-1506
DOI:10.3970/cmes.2015.106.127