D modeling
==============


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

COQUE_3D mesh in QUAD9.


.. image:: images/100000000000018800000205FE357957D59BD37D.png
    :width: 3.3484in
    :height: 4.4154in


.. _RefImage_100000000000018800000205FE357957D59BD37D.png:

The discretized geometry on the mean radius :math:`{R}_{m}=0.369m` is shown above. Elements COQUE_3D are 9-knot meshes of type QUAD9 allowing the radius of curvature of the ring to be taken into account. The middle knots are well on the average circumference. The number of knots on the circumference is 40 and on the length 5.


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

Number of knots: 200

Number of meshes and type: 40 QUAD9


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

(Frequencies in hertz)


.. csv-table::

    "**Mode**", "**Reference**", "**Code_Aster**", "**% difference**"
    "ovalization", "210.55
    210.55", "209.91
    209.91", "—0.30
    —0.30"
    "trifoliate", "587.92
    587.92", "586.51
    586.51", "—0.24
    —0.24"
    "off plan", "205.89
    205.89
    588.88
    588.88", "205.14
    205.14
    587.55
    587.55", "—0.36
    —0.36
    —0.23
    —0.23"



notes
---------

All frequencies are correctly estimated.