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Implementation of user element subroutines for frequency domain analysis of wave scattering problems with commercial finite element codes

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Figure 1.2. Definition of the domain and the different instances appearing in the BEM schemes
Figure 2.1. Definition of the degrees of freedom in a FEM discretization. In ( 2.4 ) the loading term is composed of both, the incoming displacements U 0
Figure 2.3. Assemblage for static validation of the implemented user element subroutine.
Figure 2.5. Nodal displacements corresponding to the UEL solution.
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