.. _V8.22.101:

**v8.22.101** AHLV101 - Anechoic Output Waveguide
=========================================================

**Summary:**

A rectilinear waveguide with anechoic output, with rigid walls, whose propagation medium is "normal" air, is excited by a harmonic incident wave, normal to the input face. The sound pressure field of the harmonic response is calculated using the elasto-acoustic formulation in pressure-displacement-displacement potential of the displacements.

The tests concern six different models (three-dimensional, two-dimensional and axisymmetric elasto-acoustic finite elements), they make it possible to validate the stiffness, mass, impedance and source vector matrices for the six models. The first three are for FORMULATION ='U_P_ PHI ', the next three for FORMULATION ='U_P' and the last three for FORMULATION ='U_ PSI'.

The reference result comes from an analytical calculation.


.. toctree::
    :hidden:

    self

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

    Probl_me_de_r_f_rence
    Solution_de_r_f_rence
    Mod_lisation_A
    Mod_lisation_B
    Mod_lisation_C
    Mod_lisation_D
    Mod_lisation_E
    Mod_lisation_F
    Mod_lisation_G
    Mod_lisation_H
    Mod_lisation_I
    Synth_se_des_r_sultats