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Plane-wave basis finite elements and boundary elements for three-dimensional wave scattering.

Perrey-Debain, E. and Laghrouche, O. and Bettess, P. and Trevelyan, J. (2004) 'Plane-wave basis finite elements and boundary elements for three-dimensional wave scattering.', Philosophical transactions of the Royal Society A : mathematical, physical and engineering sciences., 362 (1816). pp. 561-577.


Classical finite-element and boundary-element formulations for the Helmholtz equation are presented, and their limitations with respect to the number of variables needed to model a wavelength are explained. A new type of approximation for the potential is described in which the usual finite-element and boundary-element shape functions are modified by the inclusion of a set of plane waves, propagating in a range of directions evenly distributed on the unit sphere. Compared with standard piecewise polynomial approximation, the plane-wave basis is shown to give considerable reduction in computational complexity. In practical terms, it is concluded that the frequency for which accurate results can be obtained, using these new techniques, can be up to 60 times higher than that of the conventional finite-element method, and 10 to 15 times higher than that of the conventional boundary-element method.

Item Type:Article
Keywords:Variational formulation, Helmholtz-equation, Microlocal discretization, Diffraction problems, P-version, Partition, Quadrature, Radiation.
Full text:Full text not available from this repository.
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Date accepted:No date available
Date deposited:No date available
Date of first online publication:March 2004
Date first made open access:No date available

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