F modeling
==============


Characteristics of modeling
------------------------

This modeling is based on acoustic finite elements with pressure degrees of freedom :math:`p` from PHENOMENE =' ACOUSTIQUE '.

The free surface (group of nodes: NOSURF) is affected by a Dirichlet condition: PRES =0.0. This Dirichlet condition is performed by dualization (AFFE_CHAR_ACOU (PRES_IMPO)). This modeling gives access to only acoustic modes.


Characteristics of the mesh
----------------------------

The mesh contains: 513 HEXA8; 57 QUAD4.


Tested values
---------------


.. csv-table::

    "**Identification**", "**Reference** (:math:`\mathit{Hz}`)"
    "Acoustic mode 0, 0, 0", "1166.67"
    "Acoustic mode 1, 0, 0", "1458.33"
    "Acoustic mode 2, 0, 0", "2103.24"
    "Acoustic mode 3, 0, 0", "2872.58"
    "Acoustic mode 0, 0, 1", "3500.00"