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Implementation and computational aspects of a 3D elastic wave modelling by PUFEM

Mahmood, M.S.; Laghrouche, O.; Trevelyan, J.; El Kacimi, A.

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M.S. Mahmood

O. Laghrouche

A. El Kacimi


This paper presents an enriched finite element model for three dimensional elastic wave problems, in the frequency domain, capable of containing many wavelengths per nodal spacing. This is achieved by applying the plane wave basis decomposition to the three-dimensional (3D) elastic wave equation and expressing the displacement field as a sum of both pressure (P) and shear (S) plane waves. The implementation of this model in 3D presents a number of issues in comparison to its 2D counterpart, especially regarding how S-waves are used in the basis at each node and how to choose the balance between P and S-waves in the approximation space. Various proposed techniques that could be used for the selection of wave directions in 3D are also summarised and used. The developed elements allow us to relax the traditional requirement which consists to consider many nodal points per wavelength, used with low order polynomial based finite elements, and therefore solve elastic wave problems without refining the mesh of the computational domain at each frequency. The effectiveness of the proposed technique is determined by comparing solutions for selected problems with available analytical models or to high resolution numerical results using conventional finite elements, by considering the effect of the mesh size and the number of enriching 3D plane waves. Both balanced and unbalanced choices of plane wave directions in space on structured mesh grids are investigated for assessing the accuracy and conditioning of this 3D PUFEM model for elastic waves.


Mahmood, M., Laghrouche, O., Trevelyan, J., & El Kacimi, A. (2017). Implementation and computational aspects of a 3D elastic wave modelling by PUFEM. Applied Mathematical Modelling, 49, 568-586.

Journal Article Type Article
Acceptance Date May 7, 2017
Online Publication Date May 12, 2017
Publication Date Sep 1, 2017
Deposit Date May 16, 2017
Publicly Available Date May 17, 2017
Journal Applied Mathematical Modelling
Print ISSN 0307-904X
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 49
Pages 568-586


Accepted Journal Article (406 Kb)

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