background image
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.
background image
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.