.. _R4.02.05:

**r4.02.05** Absorbing border elements
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**Summary**

This document describes the layout of absorbent boundary elements in code_aster. These paraxial elements, whose theory is described here, are assigned to elastic or fluid domain boundaries to deal with 2D or 3D soil-structure or soil-fluid-structure interaction problems. They make it possible to satisfy the Sommerfeld condition verifying the hypothesis of anechoicity: the elimination of diffracted and non-physical elastic or acoustic plane waves coming from infinity.




.. toctree::
    :hidden:

    self

.. toctree::
    :maxdepth: 2
    :numbered:

    Introduction
    Th_orie_des__l_ments_paraxiaux
    _l_ments_fluides_an_cho_ques_en_transitoire
    _l_ments_absorbants__lastiques_dans_Code_Aster
    Bibliographie