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


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

The **upwind method** of operator PROPA_FISS is used to propagate the crack. An auxiliary grid is used.


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

The mesh is the same as that of modeling A.

The auxiliary grid is composed of 2800 elements of type HEXA8 of size :math:`1.5\times 1.5\times 2\mathit{mm}`. The grid extends inside the holes.


.. image:: images/10000201000003640000028B8D90496E3C822592.png
    :width: 3.4472in
    :height: 2.5854in


.. _RefImage_10000201000003640000028B8D90496E3C822592.png:

**Figure** 5.2-a **: auxiliary grid used to update the crack level sets**


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

First of all, we test the number of pieces that make up the bottom of the crack at each propagation step:


.. csv-table::

    "**No propagation**", "**Reference type**", "**Reference value**"
    "1", "'ANALYTIQUE'", "4"
    "2", "'ANALYTIQUE'", "1"


The position of the bottom of the crack is also tested at each propagation step, which can be done by verifying the maximum value of the y coordinate of the bottom points:


.. csv-table::

    "**No propagation**", "**Reference type**", "**Reference value**"
    "1", "'ANALYTIQUE'", "16.0"
    "2", "'ANALYTIQUE'", "28.0"