Modeling A
==============


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

We only model one eighth of the sphere axisymmetrically:


.. image:: images/Shape2.gif


.. _RefSchema_Shape2.gif:

**Figure** 3.1-a **: geometry of the structure — axisymmetric model**

We impose DNOR =0 for symmetry and a unit internal pressure PRES_REP of :math:`1\mathit{MPa}`.


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

The model is axisymmetric and includes 2109 TRIA3.


Tested sizes and results
------------------------------

To validate the solution obtained, the pilot parameter is tested at the last moment, which should be equal to the pressure obtained by the formula given in §2.


.. csv-table::

    "**Value tested**", "**Instant**", "**Reference**", "**Type**", "**Variance**"
    "Control parameter", "20.0", "415.89", "Analytics", "0.19%"
    "", "20.0", "416.45", "Non-regression", ":math:`1.0\mathrm{\times }{10}^{\mathrm{-}8}\text{\%}`"