Code_Aster ®
Version
7.4
Titrate:
Modelings 2d_FLUIDE, 2d_FLUI_STRU, AXIS_FLUIDE,…
Date:
01/06/05
Author (S):
NR. GREFFET, F. LEBOUVIER Key
:
U3.13.03-D Page
: 1/4
Organization (S): EDF-R & D/AMA, DeltaCAD
Handbook of Utilization
U3.13 booklet: Mechanical finite elements 2D
Document: U3.13.03
Modelings 2d_FLUIDE, 2d_FLUI_STRU,
AXIS_FLUIDE, AXIS_FLUI_STRU
Summary:
This document describes for modelings 2d_FLUIDE, 2d_FLUI_STRU, AXIS_FLUIDE, AXIS_FLUI_STRU:
· degrees of freedom carried by the finite elements which support modeling,
· the related meshs supports,
· supported loadings,
· nonlinear possibilities,
· case-tests implementing modelings.
Modelings 2d_FLUIDE (elements in a plan) and 2d_FLUI_STRU (elements 1D of interaction
fluid-structure) correspond to the formulation in 2D in linear assumption of the allowing coupled problem
the study of the vibratory behavior of a structure in the presence of a nonviscous, compressible fluid
[R4.02.01]. Currently, the taking into account of the free face is not developed.
Modelings AXIS_FLUIDE (elements in a plan) and AXIS_FLUI_STRU (elements 1D of interaction
fluid-structure) correspond to the formulation in axisymetry in linear assumption of the coupled problem
allowing the study of the vibratory behavior of a structure in the presence of a nonviscous fluid,
compressible [R4.02.01]. Currently, the taking into account of the free face is not developed.
Handbook of Utilization
U3.13 booklet: Mechanical finite elements 2D
HT-66/05/004/A
Code_Aster ®
Version
7.4
Titrate:
Modelings 2d_FLUIDE, 2d_FLUI_STRU, AXIS_FLUIDE,…
Date:
01/06/05
Author (S):
NR. GREFFET, F. LEBOUVIER Key
:
U3.13.03-D Page
: 2/4
1 Discretization
1.1
Degrees of freedom
Finished element
Degrees of freedom (with each node node)
MEFLTR3, MEFLTR6,
PRES: pressure
MEFLQU4, MEFLQU8, MEFLQU9 PHI: potential of displacement
MEFLSE2, MEFLSE3
PHI: fluid potential of displacement
MEFSSE2, MEFSSE3
DX, DY: components of structure displacement
PHI: fluid potential of displacement
MEAXFLT3, MEAXFLT6,
PRES: pressure
MEAXFLQ4, MEAXFLQ8,
PHI: potential of displacement
MEAXFLQ9
MEAXFLS2, MEAXFLS3
PHI: fluid potential of displacement
MEAXFSS2, MEAXFSS3
DX, DY: components of structure displacement
PHI: fluid potential of displacement
1.2
Net support of the matrices of rigidity
Modeling Nets Element
finished
Remarks
2d_FLUIDE TRIA3
MEFLTR3
TRIA6
MEFLTR6
QUAD4
MEFLQU4
QUAD8 MEFLQU8
QUAD9 MEFLQU9
2d_FLUI_STRU SEG2 MEFSSE2
SEG3 MEFSSE3
AXIS_FLUIDE TRIA3 MEAXFLT3
TRIA6 MEAXFLT6
QUAD4 MEAXFLQ4
QUAD8
MEAXFLQ8
QUAD9 MEAXFLQ9
AXIS_FLUI_STRU SEG2
MEAXFSS2
SEG3 MEAXFSS3
1.3
Net support of the loadings
Modeling Nets Element
finished
Remarks
2d_FLUIDE SEG2 MEFLSE2
SEG3
MEFLSE3
AXIS_FLUIDE SEG2 MEAXFLS2
SEG3
MEAXFLS3
Handbook of Utilization
U3.13 booklet: Mechanical finite elements 2D
HT-66/05/004/A
Code_Aster ®
Version
7.4
Titrate:
Modelings 2d_FLUIDE, 2d_FLUI_STRU, AXIS_FLUIDE,…
Date:
01/06/05
Author (S):
NR. GREFFET, F. LEBOUVIER Key
:
U3.13.03-D Page
: 3/4
2 Loadings
supported
The supported loadings are as follows:
· VITE_FACE
Allows to specify the field normal speed real, vibratory imposed in loading on
elements of border.
Supported modelings: 2d_FLUIDE, AXIS_FLUIDE
· IMPE_FACE
Allows to specify the card of normal impedance imposed in boundary condition on elements
of border.
Supported modelings: 2d_FLUIDE, AXIS_FLUIDE
· ONDE_FLUI
Allows to specify an amplitude of pressure of sinusoidal real incidental wave arriving
normally with a face.
Supported modelings: 2d_FLUIDE, AXIS_FLUIDE
3 Possibilities
non-linear
3.1
Laws of behaviors
The only relation of behavior available in DYNA_NON_LINE, for modelings
2d_FLUI_STRU and AXIS_FLUI_STRU under COMP_INCR are RELATION “ELAS” (Cf. [U4.51.11]).
3.2 Deformations
Only the linearized deformations key word “PETIT” under DEFORMATION are available in
relations of behavior (Cf. [U4.51.11]).
4
Examples of implementation: case-tests
· 2d_FLUIDE
FDLV111B [V8.01.111]: Calculation of the absorption of a wave of pressure created by a piston, in
a fluid column.
· AXIS_FLUIDE
AHLV101C [V8.22.101]: Calculation of the acoustic field of pressure of the harmonic response of one
guide rectilinear wave at anechoic exit, with rigid walls, whose propagation medium is of
“normal” air, excited by a harmonically vibrating piston.
· 2d_FLUI_STRU
FDLV111B [V8.01.111]: Calculation of the absorption of a wave of pressure created by a piston, in
a fluid column.
· AXIS_FLUI_STRU
ADLV100C [V8.21.100]: Piston coupled to a fluid column: calculation in fluid coupling
accoustics-structure of the first mode of a system fluide1 - piston fluid 2.
Handbook of Utilization
U3.13 booklet: Mechanical finite elements 2D
HT-66/05/004/A
Code_Aster ®
Version
7.4
Titrate:
Modelings 2d_FLUIDE, 2d_FLUI_STRU, AXIS_FLUIDE,…
Date:
01/06/05
Author (S):
NR. GREFFET, F. LEBOUVIER Key
:
U3.13.03-D Page
: 4/4
Intentionally white left page.
Handbook of Utilization
U3.13 booklet: Mechanical finite elements 2D
HT-66/05/004/A
Outline document