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NAS104, Section 5, March 2004
Copyright2004 MSC.Software Corporation
SECTION 5
TRANSIENT THERMAL ANALYSIS(SOL 159)
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NAS104, Section 5, March 2004
Copyright2004 MSC.Software Corporation
PROJECT 6QVOL(TIME)
This project comes from example 7c in the
MSC.Nastran Thermal User Guide.
Objective: apply time varying volumetric heating to a
single 1x1x1 CHEXA element.
HGEN=10.0
Also, convect to ambient temperature at 0 degree C
with a constant h of 100.0
Initially the solid is at zero degree
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NAS104, Section 5, March 2004
Copyright2004 MSC.Software Corporation
PROJECT 6QVOL(TIME)
Specify QVOL as a function of
time Create a Non Spatial field named
qvol_time
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NAS104, Section 5, March 2004
Copyright2004 MSC.Software Corporation
PROJECT 6QVOL(TIME)
Create a 1x1x1 solid.
IsoMesh the solid Hex8 topology
GEL = 1.0
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NAS104, Section 5, March 2004
Copyright2004 MSC.Software Corporation
PROJECT 6QVOL(TIME)
Create a material
property set for
aluminum K
Cp
Rho
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NAS104, Section 5, March 2004
Copyright2004 MSC.Software Corporation
PROJECT 6QVOL(TIME)
Change the Constitutive
Model to Heat generation
10.0 is the factor by whichthe heat generation is
multiplied
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Copyright2004 MSC.Software Corporation
PROJECT 6QVOL(TIME)
Create 3D element
property set
Aluminum
Solid 1
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Copyright2004 MSC.Software Corporation
PROJECT 6QVOL(TIME)
To create a time dependent
thermal load(e.g. applied
heating) it is necessary to first
create a time dependent load
case. When this is done theLBC form in MSC.Patran will
have the necessary entry lists
for the transient inputs.
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NAS104, Section 5, March 2004
Copyright2004 MSC.Software Corporation
PROJECT 6QVOL(TIME)
The QVOL function is equal to
10000.0 * qvol_time(non spatial
time dependent field)
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NAS104, Section 5, March 2004
Copyright2004 MSC.Software Corporation
PROJECT 6QVOL(TIME)
Create convection to ambient temperature Constant convection coefficient h=100
Ambient temperature is 0 C
No time function is used
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NAS104, Section 5, March 2004
Copyright2004 MSC.Software Corporation
PROJECT 6QVOL(TIME)
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Copyright2004 MSC.Software Corporation
PROJECT 6QVOL(TIME)
Create a subcase under
Subcases A subcase is automatically created for
each load case that is created. They
both have the same name.
It may be necessary to change some of
the subcase settings, e.g. change someof the settings under Subcase
Parameters
It is possible to create a new subcase
using the available load cases. When
this is done specify the values for the
various subcase parameters.
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NAS104, Section 5, March 2004
Copyright2004 MSC.Software Corporation
PROJECT 6QVOL(TIME)
Under Subcase Select
select the subcase named
tran for the transient
analysis
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NAS104, Section 5, March 2004
Copyright2004 MSC.Software Corporation
PROJECT 6QVOL(TIME)
Access the transient
thermal analysis results
by attaching the .xdb
file to the MSC.Patrandatabase.
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NAS104, Section 5, March 2004
Copyright2004 MSC.Software Corporation
PROJECT 6QVOL(TIME)
Create a plot of
temperature versus
time at a node(s)
After selecting theresult case
(SC1:TRAN), result
type(temperatures),
X: Global Variable
Time, then select
the second icon at
the top of the form
Target Entities
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Copyright2004 MSC.Software Corporation
PROJECT 6QVOL(TIME)
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Copyright2004 MSC.Software Corporation
PROJECT 6QVOL(TIME)
SOL 159
TIME 600
CEND
ANALYSIS = HEATTITLE = MSC/NASTRAN job created on 08-Jul-98 at
16:41:04
ECHO = SORT
MAXLINES = 999999999
SPC = 1
IC = 1
SUBCASE 1
$ Subcase name : tran
SUBTITLE=tranTSTEPNL = 1
DLOAD = 2
THERMAL(SORT2,PRINT)=ALL
FLUX(SORT2,PRINT)=ALL
Extracted from MSC.Nastran model .DAT file
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Copyright2004 MSC.Software Corporation
PROJECT 6QVOL(TIME)
PSOLID 1 1 0
CHEXA 1 1 1 2 4 3 5 6 + B
+ B 8 7
$ Referenced Material Records
$ Material Record : alum$ Description of Material : Date: 08-Jul-98 Time: 16:15:34
MAT4 1 204. 896. 2707. 10.
$ Nodes of the Entire Model
GRID 1 0. 0. 0.
GRID 2 1. 0. 0.
GRID 3 0. 1. 0.
GRID 4 1. 1. 0.
GRID 5 0. 0. 1.
GRID 6 1. 0. 1.GRID 7 0. 1. 1.
GRID 8 1. 1. 1.
Extracted from MSC.Nastran model .DAT file
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Copyright2004 MSC.Software Corporation
PROJECT 6QVOL(TIME)
$ Loads for Load Case : tran
TLOAD1 4 3 1
DLOAD 2 1. 1. 4
$ Fixed Temperatures of Load Set : conv
SPC 1 9 1 0.
$ Volumetric Heat Generation of Load Set : qvol
QVOL 3 10000. 1$ Scalar Points
SPOINT 9
$ Dynamic Load Table : qvol_timeTABLED1 1 + C
+ C 0. 0. 1000. 1. 2000. 0. 3000. 0. + D
+ D ENDT
Extracted from MSC.Nastran model .DAT file
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Copyright2004 MSC.Software Corporation
PROJECT 6QVOL(TIME)
$ Initial Temperatures from Temperature Load Sets
TEMP 1 9 0.
$ Default Initial Temperature
TEMPD 1 0.$ CHBDYG Surface Elements
CHBDYG 1 AREA4 + E
+ E 1 2 6 5
CHBDYG 2 AREA4 + F
+ F 3 7 8 4
CHBDYG 3 AREA4 + G
+ G 1 3 4 2
CHBDYG 4 AREA4 + H
+ H 2 4 8 6CHBDYG 5 AREA4 + I
+ I 6 8 7 5
CHBDYG 6 AREA4 + J
+ J 5 7 3 1
Extracted from MSC.Nastran model .DAT file
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Copyright2004 MSC.Software Corporation
PROJECT 6QVOL(TIME)
$ Convection to Ambient of Load Set : conv
PCONV 1 1001 0 0.
CONV 1 1 0 0 9CONV 2 1 0 0 9
CONV 3 1 0 0 9
CONV 4 1 0 0 9
CONV 5 1 0 0 9
CONV 6 1 0 0 9
$ Free Convection Heat Transfer CoefficientsMAT4 1001 100.
Extracted from MSC.Nastran model .DAT file
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PROJECT 6QVOL(TIME)
0
SUBCASE 1
POINT-ID = 3
T E M P E R A T U R E V E C T O R
TIME TYPE VALUE
0.0 S 0.0
1.000000E+01 S 2.061824E-03
2.000000E+01 S 8.236363E-033.000000E+01 S 1.851345E-02
4.000000E+01 S 3.288296E-02
5.000000E+01 S 5.133478E-02
6.000000E+01 S 7.385881E-02
7.000000E+01 S 1.004450E-01
8.000000E+01 S 1.310833E-01
9.000000E+01 S 1.657638E-01
1.000000E+02 S 2.044763E-01
1.100000E+02 S 2.472110E-01
TSTEPNL 1 6000 1.0 10 ADAPT UPW ++000001
++000001 ++000002
++000002 0
Deactivate the automatic adjustment(adaptivity)
Extract from MSC.Nastran ASCII Results File
Extracted from MSC.Nastran model .DAT file
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Copyright2004 MSC.Software Corporation
PROJECT 6QVOL(TIME)
$TITLE = MSC/NASTRAN JOB 49
$SUBTITLE=TRAN 50$LABEL = 51
$DISPLACEMENTS 52
$REAL OUTPUT 53
$SUBCASE ID = 1 54
$TIME = 0.5000000E+03 55
TEMP* 4 1 4.948450E+00 56
TEMP* 4 2 4.948450E+00 57
TEMP* 4 3 4.948450E+00 58
TEMP* 4 4 4.948450E+00 59TEMP* 4 5 4.948450E+00 60
TEMP* 4 6 4.948450E+00 61
TEMP* 4 7 4.948450E+00 62
TEMP* 4 8 4.948450E+00 63
TEMP* 4 9 0.000000E+00 64
Extract from MSC.Nastran ASCII Punch File
Results in SORT1 format in punch file.
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NAS104, Section 5, March 2004
Perform Workshop 8 Transient Thermal in the
exercise workbook.
Perform Workshop 9 Transient Thermal Analysis of a
Cooling fin in the exercise workbook.
Perform Workshop 10 Holman example 4-14,
Radiation heating and cooling of ceramics in the
exercise workbook.
Perform Workshop 11 Heating a block of ice cream
in the exercise workbook
EXERCISES