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

Organization (S): EDF-R & D/AMA, DeltaCAD
Handbook of Utilization
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 (Phénomène: MECANIQUE) 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.

Handbook of Utilization
U3.13 booklet: Mechanical finite elements 2D
HT-66/05/004/A

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

1 Discretization

1.1
Degrees of freedom

Modeling
Degrees of freedom (with each node node)

2d_FLUI_ABSO
PRES: 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

linear 2d_FLUI_ABSO SEG2

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 operator DYNA_NON_LINE, it is necessary to use the key word
RELATION = “ELAS” as well as 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.

Handbook of Utilization
U3.13 booklet: Mechanical finite elements 2D
HT-66/05/004/A

Outline document