Code_Aster ®
Version
7.4
Titrate:
Modeling 3d_FLUI_ABSO


Date:
01/06/05
Author (S):
G. DEVESA, F. LEBOUVIER Key
:
U3.14.10-C Page
: 1/4

Organization (S): EDF-R & D/AMA, DeltaCAD
Handbook of Utilization
U3.14 booklet: Mechanical finite elements 3D
Document: U3.14.10

Modeling 3d_FLUI_ABSO

Summary:

This document describes for modeling 3d_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 3d_FLUI_ABSO (Phénomčne: MECANIQUE) corresponds to finite elements of which meshs
supports are surface. They make it possible to take into account the condition of absorbing border of volumes
fluids.

Handbook of Utilization
U3.14 booklet: Mechanical finite elements 3D
HT-66/05/004/A

Code_Aster ®
Version
7.4
Titrate:
Modeling 3d_FLUI_ABSO


Date:
01/06/05
Author (S):
G. DEVESA, F. LEBOUVIER Key
:
U3.14.10-C Page
: 2/4

1 Discretization

1.1
Degrees of freedom

Modeling
Degrees of freedom (with each node node)

3d_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 can be quadrangles or triangles. Elements
are isoparametric.

Modeling Nets Interpolation
Remarks

linear 3d_FLUI_ABSO TRIA3

TRIA6
quadratic

QUAD4
linear

QUAD8
quadratic
QUAD9

1.3
Net support of the loadings

The same ones as previously.

2 Loadings
supported

AFFE_CHAR_MECA

3d_FLUI_ABSO
Remarks


DDL_IMPO
FDLV111A

Handbook of Utilization
U3.14 booklet: Mechanical finite elements 3D
HT-66/05/004/A

Code_Aster ®
Version
7.4
Titrate:
Modeling 3d_FLUI_ABSO


Date:
01/06/05
Author (S):
G. DEVESA, F. LEBOUVIER Key
:
U3.14.10-C Page
: 3/4

3 Possibilities
non-linear

3.1
Laws of behaviors

The only relation of behavior available for this modeling is RELATION “ELAS” (under
COMP_INCR) in DYNA_NON_LINE (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

FDLV111A [V8.01.111]: Absorption of a wave of pressure in a fluid column

Handbook of Utilization
U3.14 booklet: Mechanical finite elements 3D
HT-66/05/004/A

Code_Aster ®
Version
7.4
Titrate:
Modeling 3d_FLUI_ABSO


Date:
01/06/05
Author (S):
G. DEVESA, F. LEBOUVIER Key
:
U3.14.10-C Page
: 4/4

Intentionally white left page.
Handbook of Utilization
U3.14 booklet: Mechanical finite elements 3D
HT-66/05/004/A

Outline document