Code_Aster
®
Version
7.4
Titrate:
Modelings
HULL
,
COQUE_PLAN
,
COQUE_AXIS
Date:
01/06/05
Author (S):
C. DURAND
,
F. LEBOUVIER
Key:
U3.22.01-E
Page
:
1/4
Instruction manual
U3.22 booklet: Elements of thermal structure 2D
HT-66/05/004/A
Organization (S):
EDF-R & D/AMA, DeltaCAD
Instruction manual
U3.22 booklet: Elements of thermal structure 2D
U3.22.01 document
Modelings
HULL
,
COQUE_PLAN
,
COQUE_AXIS
-
Phenomenon
THERMICS
Summary:
This document describes for thermal modelings of the axisymmetric and plane elements:
·
degrees of freedom carried by the finite elements which support modeling,
·
the related meshs supports,
·
supported loadings,
·
nonlinear possibilities,
·
case-tests implementing modelings.
Modeling
HULL
phenomenon
THERMICS
[R3.11.01] is usable to treat the equations of
heat in mediums with average layer in linear thermal analysis. One can use it like the first calculation
of a thermomechanical chaining with the corresponding machine elements.
Code_Aster
®
Version
7.4
Titrate:
Modelings
HULL
,
COQUE_PLAN
,
COQUE_AXIS
Date:
01/06/05
Author (S):
C. DURAND
,
F. LEBOUVIER
Key:
U3.22.01-E
Page
:
2/4
Instruction manual
U3.22 booklet: Thermal elements of structure 2D
HT-66/05/004/A
1 Discretization
1.1
Degrees of freedom
The degrees of freedom are the temperatures
TEMP
(temperature on the average surface of the hull),
TEMP_INF
(temperature on the lower surface of the hull), and
TEMP_SUP
(temperature on
upper surface of the hull).
1.2
Meshs support of the matrices of rigidity
Modeling Nets Element
finished
Remarks
HULL TRIA3
THCOTR3
nodes with 3 co-ordinates X, y, Z
TRIA6
THCOTR6
TRIA7
THCOTR7
QUAD4
THCOQU4
QUAD8
THCOQU8
QUAD9
THCOQU9
COQUE_PLAN SEG3
THCPSE3
nodes with 2 co-ordinates X, y
COQUE_AXIS
SEG3
THCASE3
For
THCOTRi
, only the 3 nodes are exploited to define the local geometry (tangent plan,
normal). For
THCOQUi
, it is considered that the element is plane and its tangent plan is defined by
defect by 3 of the 4 nodes of the element.
1.3
Net support of the loadings
All the loadings applicable to the breakages of the elements of hull are treated by discretization
direct on the mesh support of the element in temperature formulation.
No mesh support of loading is thus necessary for the faces of the elements of
hulls.
For the applicable loadings on the edges of the elements of hull or plate of
modeling - hull, a mesh support of the type
SEG2
or
SEG3
must be used.
Modeling Nets Element
finished
Remarks
HULL SEG2
THCOSE2
with
TRIA3
and
QUAD4
HULL SEG3
THCOSE3
with
TRIA6
or
TRIA7
and
QUAD8
or
QUAD9
For the imposed temperatures, the meshs support are meshs reduced to a point.
2
Assignment of the characteristics
For these elements of thermal structures, it is necessary to affect characteristics
geometrical which is complementary to the data of mesh. The definition of these data is
carried out with the control
AFFE_CARA_ELEM
associated the key word following factor:
·
HULL
Allows to define and affect the thickness on the meshs.
Code_Aster
®
Version
7.4
Titrate:
Modelings
HULL
,
COQUE_PLAN
,
COQUE_AXIS
Date:
01/06/05
Author (S):
C. DURAND
,
F. LEBOUVIER
Key:
U3.22.01-E
Page
:
3/4
Instruction manual
U3.22 booklet: Thermal elements of structure 2D
HT-66/05/004/A
3 Loadings
supported
The loadings available are as follows:
·
FLUX_REP
Allows to apply normal flows to faces of elements of hulls to the faces ±.
Supported modelings:
HULL
,
COQUE_PLAN
,
COQUE_AXIS
·
EXCHANGE
Allows to apply conditions of exchange with an outside air temperature with faces of
hulls on the faces ±.
Supported modelings:
HULL
,
COQUE_PLAN
,
COQUE_AXIS
4 Possibilities
non-linear
Nothing.
5 Possibilities
transients
Only modeling
HULL
allows to deal with the evolutionary problems of thermics.
6
Examples of implementation: case-test
·
HULL
Stationary linear Thermique
HPLA100C [V7.01.100]: Analyze of a heavy thermoelastic hollow roll in rotation
uniform. In this modeling, one carries out a chained elastic thermo calculation and a calculation
thermoelastoplastic without plastic evolution.
TPLS100A [V4.03.100]: Analyze thermal in stationary regime of an infinite plate
subjected to a couple of antisymmetric heat transfer rates on its two half-faces.
Thermique linear transient
TTLL01M [V4.21.001]: Analyze thermal linear transient of an infinite wall subjected to a shock
thermics.
·
COQUE_PLAN
Stationary linear Thermique
HPLA100B [V7.01.100]: Analyze of a heavy thermoelastic hollow roll in rotation
uniform. In this modeling, one carries out a chained elastic thermo calculation and a calculation
thermoelastoplastic without plastic evolution.
TPLS100B [V4.03.100]: Analyze thermal in stationary regime of an infinite plate
subjected to a couple of antisymmetric heat transfer rates on its two half-faces.