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


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

Modeling includes:


* structural side:

336 shell elements DKT modeling the sphere 1,

6 discrete elements of type K_ TR_L (modeling DIS_TR) modeling the six springs connecting sphere 1 to the massif,


* fluid side:

672 THER_FACE3 thermal elements modeling the fluid/structure interface,

39 445 THER_TETRA4 thermal elements modeling the fluid.


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

Number of meshes and types: 672 TRIA3 meshes, 39,445 TETRA4, 6 SEG2


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


.. csv-table::

    "**Identification**", ":math:`\mathrm{Hz}`
    **Reference**"
    "Fashion No. 1", "3.1172"
    "Fashion No. 2", "3.1183"
    "Fashion No. 3", "9.2727"
    "Fashion No. 4", "9.8267"
    "Fashion No. 5", "22.4400"
    "Fashion No. 6", "30.3295"



notes
---------

The difference in the last two natural frequencies is explained by a non-symmetry of the mesh of the fluid/structure (thermal) interface with respect to that of the first. The **mesh** of the fluid/structure interface (thermal elements) of the second sphere cannot be deduced exactly from that of the first by rotating nautical angles of :math:`90°,0°,90°`.