background image
Code_Aster
®
Version
8.2
Titrate:
Operator
CALC_CHAM_ELEM
Date:
22/02/06
Author (S):
A. ASSIRE, J.M. PROIX
Key
:
U4.81.03-I1
Page
:
1/4
Instruction manual
U4.8- booklet: Postprocessing and dedicated analyzes
HT-62/06/004/A
Organization (S):
EDF-R & D/AMA















Instruction manual
U4.8- booklet: Postprocessing and dedicated analyzes
Document: U4.81.03



Operator
CALC_CHAM_ELEM


1 Goal
To calculate an elementary field, in thermics and accoustics, starting from fields already calculated of
type
cham_no_
*. Nature of the sizes concerned:
·
in thermics the starting field is a field of temperature, and one can calculate flow
thermics,
·
in accoustics the starting field is a field of pressure, and one can calculate the intensity
accoustics, and acoustic pressure.
These fields are calculated:
·
maybe with the nodes of the element
_ELNO
. For a given node, they are different from an element
with the other,
·
maybe at the points of integration
_ELGA
.
Let us note that one can also have access to the field (at the points of Gauss!) co-ordinates of
points of Gauss, obtained directly starting from the model.
·
Product a concept of the cham_elem_ type * or * indicates the name of the size.
For mechanics, the fields (forced or deformations, efforts generalized, energy,
indicators…) must be calculated with ugly control CALC_ELEM [U4.81.01].
background image
Code_Aster
®
Version
8.2
Titrate:
Operator
CALC_CHAM_ELEM
Date:
22/02/06
Author (S):
A. ASSIRE, J.M. PROIX
Key
:
U4.81.03-I1
Page
:
2/4
Instruction manual
U4.8- booklet: Postprocessing and dedicated analyzes
HT-62/06/004/A
2 Syntax
chamel
[cham_elem_ *] = CALC_CHAM_ELEM
(
MODEL =
Mo, [model]
CHAM_MATER
=
chmater,
[cham_mater]
CARA_ELEM
=
carac
,
[cara_elem]
# Selection of the meshs concerned with calculation
/
ALL =
“YES”,
[DEFECT]
/
|
GROUP_MA
=
l_grma,
[l_gr_maille]
|
NET = l_mail,
[l_maille]
INST
= N,
[R]
/
0.,
[DEFECT]
/
# options
thermics

OPTION =
/
“FLUX_ELNO_TEMP”,
/
“FLUX_ELGA_TEMP”,
TEMP
=
temp,
[cham_no_TEMP_R]
EXCIT
=_F
(
CHARGE = l_charge,
[l_char_meca]
/COEF_MULT = cm,
[R]
/
FONC_MULT
=
Fm,
[function]
[tablecloth]
[formula]
)
MODE_FOURIER
=/nh,
[I]
/
0,
[DEFECT]
/
# options
acoustics

OPTION=/
“PRES_ELNO_DBEL”,
/
“PRES_ELNO_REEL”,
/
“PRES_ELNO_IMAG”,
NEAR
=
near,
[cham_no_PRES_C]

/
# different
options

OPTION=
“COOR_ELGA”,
);

# standard of produced field: [cham_elem_ *] with:

If
OPTION
:
then
[*] - >
# options thermal:
FLUX_ELGA_TEMP
FLUX_R
FLUX_ELNO_TEMP
FLUX_R
# options acoustic:
PRES_ELNO_DBEL
DBEL_R
PRES_ELNO_IMAG
PRES_R
PRES_ELNO_REEL
PRES_R
# different
options

COOR_ELGA
GEOM_R
background image
Code_Aster
®
Version
8.2
Titrate:
Operator
CALC_CHAM_ELEM
Date:
22/02/06
Author (S):
A. ASSIRE, J.M. PROIX
Key
:
U4.81.03-I1
Page
:
3/4
Instruction manual
U4.8- booklet: Postprocessing and dedicated analyzes
HT-62/06/004/A
3 Operands
3.1 Operands
MODEL
/
CHAM_MATER
/
CARA_ELEM
MODEL = Mo,
Name of the model on which the option is calculated.
CHAM_MATER = chmater,
Material field associated with the model
Mo
.
CARA_ELEM = carac,
Elementary characteristics associated the model
Mo
, if it contains elements of structure or
if the isoparametric elements are affected of a local reference mark of anisotropy.
3.2
Selection of the meshs concerned with calculation
Key words
ALL = “YES”
,
GROUP_MA
and
NET
allow the user to choose the meshs
on which it wishes to make its elementary calculations of postprocessing.
/ALL = “YES”
All the meshs (carrying finite elements) will be treated. It is the default value.
/
|
GROUP_MA
= l_grma
|
NET
= l_maille
Only meshs included in
l_grma
and/or
l_maille
will be treated.
3.3 Options
thermics
The options of elementary calculation in thermics can be calculated starting from a field of
temperature:
TEMP = temp
The options available are:
|
“FLUX_ELGA_TEMP”,
|
“FLUX_ELNO_TEMP”,
Their significance is given in [U4.81.01].
3.4 Options
acoustics
The options of elementary calculation in accoustics can be calculated starting from a field of
complex pressure:
CLOSE = near
The options available are:
|
“PRES_ELNO_DBEL”
Calculation of the pressure by element to the nodes in decibels.
|
“PRES_ELNO_REEL”
“PRES_ELNO_IMAG”
Calculation of the real and imaginary parts of the field of pressure by element to the nodes.
3.5 Option
COOR_ELGA
Calculation of the co-ordinates of the points of Gauss of each element (continuous mediums 2D and 3D).
background image
Code_Aster
®
Version
8.2
Titrate:
Operator
CALC_CHAM_ELEM
Date:
22/02/06
Author (S):
A. ASSIRE, J.M. PROIX
Key
:
U4.81.03-I1
Page
:
4/4
Instruction manual
U4.8- booklet: Postprocessing and dedicated analyzes
HT-62/06/004/A
4
Examples of calculations with
CALC_CHAM_ELEM
4.1 Flow with the nodes starting from the field of temperature
temp
in
axisymmetric FOURIER mode 1
epsno = CALC_CHAM_ELEM
(MODEL = moaxfour,
TEMP = temp,
OPTION
=
“FLUX_ELNO_TEMP”, MODE_FOURIER
=
1
);