C modeling
==============


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

Elements MEAXQU4, MEAXFLQ4, MEAXFSS2


.. image:: images/100017F80000263E000011ACFB2932AB9A465335.svg
    :width: 493
    :height: 228


.. _RefImage_100017F80000263E000011ACFB2932AB9A465335.svg:

Boundary conditions:

In all the knots on the face :math:`M`


.. code-block:: text
 DDL_IMPO: (GROUP_NO): knot/surf PRES: 0. PHI :0.)

In all the nodes of the piston


.. code-block:: text
 (GROUP_NO: noeupist DY: 0.)

Point :math:`M1\mathrm{:}N019`, :math:`M2\mathrm{:}N020`, :math:`M3\mathrm{:}N021`, :math:`A\mathrm{:}N01`


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


.. csv-table::

    "Number of knots:", "21"
    "Number of meshes and types:", "12 QUAD4, 4 SEG2"



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


.. csv-table::

    "**Frequency**", "**(** :math:`\mathit{Hz}` **)**", ""
    "**Reference**", "**Aster**", "**Error (%)**"
    "13.8285", "13.8277", "< 0.01"



notes
---------

Calculations made by:


.. code-block:: text

    CALC_MODES
OPTION =' BANDE ',
CALC_FREQ =_F (FREQ =( 5.,100.))

The analytical solution of the first eigenvector is not known.

**Contents of the results file:**

Value of the first natural vibration frequency of the coupled system.