3. Modeling A#
3.1. Characteristics of modeling#
Flat thermal formulation for the fluid (TRIA3 and SEG2)
Formulation plane and discrete deformation for the solid (TRIA3 and SEG2)
Cut= |
40 TRIA3 meshes along the \(x\) axis 20 TRIA3 meshes along the \(y\) 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.) |
Node name: |
\(E=\mathrm{PBLOC1}\) \(F=\mathrm{PBLOC3}\) |
\(G=\mathrm{PBLOC4}\) |
3.2. Characteristics of the mesh#
Number of knots: 1,881
Number of meshes and types: 3,580 TRIA3, 124 SEG2
3.3. Tested values#
Identification |
Reference direct calculation |
Aster calculation with substructuring |
% difference |
|
Clean mode order \(i\): 1 |
15.8782 |
15.8782 |
+0.0000 |
|
Clean mode order \(i\): 2 |
16.7811 |
16.7811 |
16.7815 |
+0.00002 |
Clean mode order \(i\): 3 |
39.0389 |
39.0289 |
—0.0002 |
|
Clean mode order \(i\): 4 |
53.0488 |
53.0488 |
53.0586 |
—0.0002 |
3.4. notes#
Mode calculations performed by:
CALC_MODES
OPTION =” BANDE “, CALC_FREQ =_F (FREQ =( 2.,70.))