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


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

Flat thermal formulation for the fluid (TRIA3 and SEG2)

Formulation plane and discrete deformation for the solid (TRIA3 and SEG2)


.. image:: images/10006C3A000024E6000014273A2389EAB33E43BC.svg
    :width: 475
    :height: 259


.. _RefImage_10006C3A000024E6000014273A2389EAB33E43BC.svg:


.. csv-table::

    "Cut=", "40 TRIA3 meshes along the :math:`x` axis
    20 TRIA3 meshes along the :math:`y` axis
    120 SEG2 meshes on the outline of the two cylinders
    4 SEG2 meshes on the outline of the two cylinders representing the spring meshes"
    "Boundary conditions:", "DDL_IMPO: (GROUP_NO: PBLOC1 DX: 0. OF: 0. DZ: 0.)
    DDL_IMPO: (GROUP_NO: PBLOC2 DX: 0. OF: 0. DZ: 0.)
    DDL_IMPO: (GROUP_NO: PBLOC3 DX: 0. OF: 0. DZ: 0.)
    DDL_IMPO: (GROUP_NO: PBLOC4 DX: 0. OF: 0. DZ: 0.)"



.. csv-table::

    "Node name:", ":math:`E=\mathrm{PBLOC1}`
    :math:`F=\mathrm{PBLOC3}` "," :math:`L=\mathrm{PBLOC2}`
    :math:`G=\mathrm{PBLOC4}`"



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

Number of knots: 1,881

Number of meshes and types: 3,580 TRIA3, 124 SEG2


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


.. csv-table::

    "**Identification**", "**Reference**
    **direct calculation**", "**Aster**
    **calculation with**
    **substructuring**", "**% difference**"
    "Clean mode order :math:`i`: 1", "15.8782", "15.8782", "+0.0000"
    "Clean mode order :math:`i`: 2", "16.7811", "16.7811", "16.7815", "+0.00002"
    "Clean mode order :math:`i`: 3", "39.0389", "39.0289", "—0.0002"
    "Clean mode order :math:`i`: 4", "53.0488", "53.0488", "53.0586", "—0.0002"



notes
---------

Mode calculations performed by:


.. code-block:: text

    CALC_MODES
OPTION =' BANDE ',
CALC_FREQ =_F (FREQ =( 2.,70.))