Modeling A ============== Characteristics of modeling ----------------------------------- Flat thermal formulation for the fluid (QUAD4 and SEG2) Formulation plane and discrete deformation for the solid (TRIA3, QUAD4 and POI1) .. image:: images/1000000000000235000001C15D231277E5839451.png :width: 6.0417in :height: 4.8008in .. _RefImage_1000000000000235000001C15D231277E5839451.png: This modeling is intended to determine the :math:`n=1` order modes of cylinders. Higher-order shell modes cannot be simulated by this type of model, but by modeling like COQUE_CYL [:ref:`U4.22.01 `]. .. csv-table:: "Cut-out=", "64 QUAD4 meshes on the periphery of the cylinders 64 TRIA3 meshes on the inside of the inner cylinder 64 SEG2 meshes on the fluid/cylinder interface 2 QUAD4 meshes depending on the thickness of the fluid 2 QUAD4 meshes depending on the thickness of the outer cylinder" "Boundary conditions:", "DDL_IMPO =_F (GROUP_NO = ACCROCHE, DY= 0.) DDL_IMPO =_F (GROUP_NO = ACCREXT, DY=0.) TEMP_IMPO =_F (GROUP_NO = TEMPIMPO, TEMP = 0.)" Characteristics of the mesh ---------------------------- Number of knots: 356 QUAD4 Number of meshes and types: 64 TRIA3, 128 SEG2, 3 POI1 Tested values --------------- .. csv-table:: "**Identification**", "**Reference (** :math:`\mathrm{Hz}` **)**", "**% tolerance**" "Clean mode order :math:`i`: 1", "1.696", "0.1%" "Clean mode order :math:`i`: 2", "4.128", "0.1%" notes --------- Mode calculations performed by: .. code-block:: text CALC_MODES OPTION =' PLUS_PETITE ', CALC_FREQ =_F (NMAX_FREQ =2)