Code_Aster
®
Version
7.4
Titrate:
Modeling
2d_FLUI_ABSO
Date:
03/06/05
Author (S):
G. DEVESA, F. LEBOUVIER
Key
:
U3.13.13-C
Page
:
1/2
Instruction manual
U3.13 booklet: Mechanical finite elements 2D
HT-66/05/004/A
Organization (S):
EDF-R & D/AMA, DeltaCAD
Instruction manual
U3.13 booklet: Mechanical finite elements 2D
Document: U3.13.13
Modeling
2d_FLUI_ABSO
Summary:
This document describes for modeling
2d_FLUI_ABSO
:
·
degrees of freedom carried by the finite elements which support modeling,
·
the related meshs supports,
·
supported loadings,
·
nonlinear possibilities,
·
case-tests implementing modeling.
Modeling
2d_FLUI_ABSO
(Phenomenon:
MECHANICS
) corresponds to finite elements of which meshs
supports are linear. They make it possible to take into account the condition of absorbing border of sections
fluid volumes, moving plane.
Code_Aster
®
Version
7.4
Titrate:
Modeling
2d_FLUI_ABSO
Date:
03/06/05
Author (S):
G. DEVESA, F. LEBOUVIER
Key
:
U3.13.13-C
Page
:
2/2
Instruction manual
U3.13 booklet: Mechanical finite elements 2D
HT-66/05/004/A
1 Discretization
1.1
Degrees of freedom
Modeling
Degrees of freedom (with each node node)
2d_FLUI_ABSO
NEAR
: pressure
PHI
: fluid potential of displacement
1.2
Net support of the matrices of rigidity
The meshs supports of the finite elements are segments. The elements are isoparametric.
Modeling Nets Interpolation
Remarks
2d_FLUI_ABSO SEG2
linear
SEG3
quadratic
1.3
Net support of the loadings
The same ones as previously.
2 Loadings
supported
No specific loading is supported by this modeling.
3 Possibilities
non-linear
In the case of a calculation with the operator
DYNA_NON_LINE
, it is necessary to use the key word
RELATION
=
“ELAS”
as well as the key word
DEFORMATION=' PETIT'
defined under the key word
COMP_INCR
.
4
Example of implementation: case-test
FDLV111B [V8.01.111]: Calculation of the absorption of a wave of pressure, created by a piston, in one
fluid column.