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


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

The calculation is a linear thermal resolution.


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


The calculation mesh
~~~~~~~~~~~~~~~~~~~~~~~

The initial mesh was created by Salome. He is in degree 1. Before the calculation, the mesh is passed to degree 2 by the command CREA_MAILLAGE.


.. csv-table::

    "Number of nodes:", "1106"
    "Number of SEG2:", "187"
    "Number of TRIA3:", "1954"
    "Number of TETRA4:", "3584"


The groups are defined to be able to follow the borders, apply the material and loads, and perform the final test.


.. csv-table::

    "VOLUME ", "Volume meshes."
    "IN1 ", "The face of the inlet of the big pipe."
    "IN2 ", "The face of the inlet of the small pipe."
    "OUT ", "The face of the outlet of the big pipe."
    "T1_ INT ", "The inner side of the big pipe."
    "T2_ INT ", "The inner side of the small pipe."
    "T1_ EXT ", "The outer side of the big pipe."
    "T2_ EXT ", "The outer side of the small pipe."
    "IN2_IA ", "The 1st internal half-edge of the small pipe inlet."
    "IN2_IB ", "The 2nd inner half-edge of the small pipe inlet."
    "IN2_EA ", "The 1st external half-edge of the small pipe inlet."
    "IN2_EB ", "The 2nd external half-edge of the small pipe inlet."
    "INT_EA ", "The 1st outer half-edge of the intersection."
    "INT_EB ", "The 2nd outer half-edge of the intersection."
    "INT_IA ", "The 1st internal half-edge of the intersection."
    "INT_IB ", "The 2nd inner half-edge of the intersection."
    "POINT ", "A node at the intersection of the external faces of pipes."



.. image:: images/10000201000003EC0000031E96F1A8C29A9286ED.png
    :width: 6.889in
    :height: 5.4752in


.. _RefImage_10000201000003EC0000031E96F1A8C29A9286ED.png:

**Figure** 3.2.1-1 **.: Initial mesh**


The border network
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The initial mesh was created by Salome. He is in degree 1. Its purpose is to define a 1D border numerically. Only the sharp edges of the geometry were meshed, with a fineness an order of magnitude greater than that of the calculation mesh. We chose to discretize each sharp edge of the mesh into 1000 segments.


.. csv-table::

    "Number of knots:", "17996"
    "Number of SEG2:", "18000"


We find the same groups as in the calculation mesh, to represent the same geometric locations. Only segment groups exist.


.. csv-table::

    "IN2_IA ", "The 1st internal half-edge of the small pipe inlet."
    "IN2_IB ", "The 2nd inner half-edge of the small pipe inlet."
    "IN2_EA ", "The 1st external half-edge of the small pipe inlet."
    "IN2_EB ", "The 2nd external half-edge of the small pipe inlet."
    "INT_EA ", "The 1st outer half-edge of the intersection."
    "INT_EB ", "The 2nd outer half-edge of the intersection."
    "INT_IA ", "The 1st internal half-edge of the intersection."
    "INT_IB ", "The 2nd inner half-edge of the intersection."



Features tested
-----------------------


.. csv-table::

    "**Orders**", "", ""
    "MACR_ADAP_MAIL "," OPTION "," FRONTIERE_ANALYTIQUE"
    "", "", "MAILLAGE_FRONTIERE"
    "", "", "GROUP_MA_FRONT"



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

The non-regression is tested on a node in the intersection.


.. csv-table::

    "Field", "Component", "Value"
    ":math:`\mathrm{TEM}` "," :math:`\mathrm{TEM}` ", "370.861930"


**Table** 3.4-1 **.: Reference values**