Presentation
A BEM based on the Bézier/Bernstein polynomial for acoustic waveguide modelization
Author/s | Romero Ordóñez, Antonio
Galvín, Pedro Tadeu, Antònio |
Department | Universidad de Sevilla. Departamento de Mecánica de Medios Continuos y Teoría de Estructuras |
Publication Date | 2019 |
Deposit Date | 2020-02-26 |
Published in |
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ISBN/ISSN | 9781784663414 1743-3533 |
Abstract | This paper proposes a novel boundary element approach formulated on the Bézier–Bernstein basis to yield a geometry-independent field approximation. The proposed method is geometrically based on both computer aided design ... This paper proposes a novel boundary element approach formulated on the Bézier–Bernstein basis to yield a geometry-independent field approximation. The proposed method is geometrically based on both computer aided design (CAD) and isogeometric analysis (IGA), but field variables are independently approximated from the geometry. This approach allows the appropriate approximation functions for the geometry and variable field to be chosen. We use the Bézier–Bernstein form of a polynomial as an approximation basis to represent both geometry and field variables. The solution of the element interpolation problem in the Bézier–Bernstein space defines generalised Lagrange interpolation functions that are used as element shape functions. The resulting Bernstein–Vandermonde matrix related to the Bézier–Bernstein interpolation problem is inverted using the Newton–Bernstein algorithm. The applicability of the proposed method is demonstrated by solving the Helmholtz equation over an unbounded region in a two-and-a-half dimensional (2.5D) domain. |
Project ID. | BIA2016-75042-C2-1-R |
Citation | Romero, A., Galvín, P. y Tadeu, A. (2019). A BEM based on the Bézier/Bernstein polynomial for acoustic waveguide modelization. En 42nd International Conference on Boundary Elements and other Mesh Reduction Methods, BEM/MRM 2019. WIT Transactions on Engineering Sciences, Vol.126, 2019, p. 13-23 (13-23), Lisboa: WIT Press. |
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