Transient Thermal Analysis in FEMAP

[modeldamper]

Hello all

I need some help in thermal analysis in FEMAP/NX-Nastran. I have 17 layers stacked on each other. Initial temperature at the bottom and top of the layer is set at 250F. I would like to know the temperature of each layer as time goes on. How do I do that?

Total time duration is 2hrs (7200 secs) and I would like to know the temperature of each layer at every 120 secs

I would appreciate if someone could help me on this.

Thanks
Modeldamper

 

[chinny8]

Bump!

I am struggling as well in this area. If anyone with experience could help out, that would be great.

Btw modeldamper,
how did you set your initial temperature of both surfaces? I cannot figure the appropriate approach.
1. Under materials section, set reference temperature?
2. Under Analysis > Manage > Masters Request and Condition > Boundary Conditions > (tick) initial condition? if so, how do you set this up under loading section?

Another question is, in order to set an adiabatic boundary condition,
do I just set heat flux = 0 at selected surfaces?
Please advice.

Cheers,
Chin

 

[IRstuff]

Perhaps you two should look for the forum for your specific software. There appears to he a FEMAP as well as a NASTRAN forum here.

TTFN
faq731-376

Need help writing a question or understanding a reply? forum1529

Of course I can. I can do anything. I can do absolutely anything. I'm an expert!

 

[modeldamper]

Hi Chin.

Sorry, I couldn't get back to you. Here is the .dat file. Top layer and the bottom layer are set at 250F and their nodes are 1,2,3,4,205,206,207,208. Rest of the nodes (middle layers) are set at 70F. Specific heat for material varies and I have assumed 80000 here. Hope this helps.




INIT MASTER(S)
NASTRAN SYSTEM(442)=-1,SYSTEM(319)=1
ID Femap,Femap
SOL NLTCSH
TIME 10000
CEND
ANALYSIS = HEAT
TITLE = NX Nastran Trans Heat Analysis Set
ECHO = NONE
THERMAL(SORT1,PLOT) = ALL
SPCFORCE(PLOT) = ALL
FLUX(PLOT) = ALL
IC = 2
SPC = 1
TSTEPNL = 1
BEGIN BULK
$ ***************************************************************************
$ Written by : Femap with NX Nastran
$ Version : 11.1.2
$ Translator : NX Nastran
$ From Model :
$ Date : Fri Oct 10 10:38:03 2014
$ ***************************************************************************
$
PARAM,PRGPST,NO
TSTEPNL 1 100 12. 10 10 U+
+ .001 +
+ 0 NO+
+
PARAM,POST,-1
PARAM,OGEOM,NO
PARAM,AUTOSPC,NO
PARAM,K6ROT,100.
PARAM,GRDPNT,0
CORD2C 1 0 0. 0. 0. 0. 0. 1.+FEMAPC1
+FEMAPC1 1. 0. 1.
CORD2S 2 0 0. 0. 0. 0. 0. 1.+FEMAPC2
+FEMAPC2 1. 0. 1.
$ Femap with NX Nastran Property 2 :
PSOLID 2 1 0
$ Femap with NX Nastran Property 3 :
PSOLID 3 2 0
$ Femap with NX Nastran Property 4 :
PSOLID 4 1 0
$ Femap with NX Nastran Property 5 :
PSOLID 5 1 0
$ Femap with NX Nastran Material 1 :
MAT4 1 6.741 800000. 1. 1.
$ Femap with NX Nastran Material 2 :
MAT4 2 6.741 800000. 1. 1.
SPC 1 1 1 250.
SPC 1 2 1 250.
SPC 1 3 1 250.
SPC 1 4 1 250.
SPC 1 205 1 250.
SPC 1 206 1 250.
SPC 1 207 1 250.
SPC 1 208 1 250.
TEMP 2 5 70.
TEMP 2 6 70.
TEMP 2 7 70.
TEMP 2 8 70.
TEMP 2 9 70.
TEMP 2 10 70.
TEMP 2 11 70.
TEMP 2 12 70.
TEMP 2 13 70.
TEMP 2 14 70.
TEMP 2 15 70.
TEMP 2 16 70.
TEMP 2 17 70.
TEMP 2 18 70.
TEMP 2 19 70.
TEMP 2 20 70.
TEMP 2 21 70.
TEMP 2 22 70.
TEMP 2 23 70.
TEMP 2 24 70.
TEMP 2 25 70.
TEMP 2 26 70.
TEMP 2 27 70.
TEMP 2 28 70.
TEMP 2 29 70.
TEMP 2 30 70.
TEMP 2 31 70.
TEMP 2 32 70.
TEMP 2 33 70.
TEMP 2 34 70.
TEMP 2 35 70.
TEMP 2 36 70.
TEMP 2 37 70.
TEMP 2 38 70.
TEMP 2 39 70.
TEMP 2 40 70.
TEMP 2 41 70.
TEMP 2 42 70.
TEMP 2 43 70.
TEMP 2 44 70.
TEMP 2 45 70.
TEMP 2 46 70.
TEMP 2 47 70.
TEMP 2 48 70.
TEMP 2 49 70.
TEMP 2 50 70.
TEMP 2 51 70.
TEMP 2 52 70.
TEMP 2 53 70.
TEMP 2 54 70.
TEMP 2 55 70.
TEMP 2 56 70.
TEMP 2 57 70.
TEMP 2 58 70.
TEMP 2 59 70.
TEMP 2 60 70.
TEMP 2 61 70.
TEMP 2 62 70.
TEMP 2 63 70.
TEMP 2 64 70.
TEMP 2 65 70.
TEMP 2 66 70.
TEMP 2 67 70.
TEMP 2 68 70.
TEMP 2 69 70.
TEMP 2 70 70.
TEMP 2 71 70.
TEMP 2 72 70.
TEMP 2 73 70.
TEMP 2 74 70.
TEMP 2 75 70.
TEMP 2 76 70.
TEMP 2 77 70.
TEMP 2 78 70.
TEMP 2 79 70.
TEMP 2 80 70.
TEMP 2 81 70.
TEMP 2 82 70.
TEMP 2 83 70.
TEMP 2 84 70.
TEMP 2 85 70.
TEMP 2 86 70.
TEMP 2 87 70.
TEMP 2 88 70.
TEMP 2 89 70.
TEMP 2 90 70.
TEMP 2 91 70.
TEMP 2 92 70.
TEMP 2 93 70.
TEMP 2 94 70.
TEMP 2 95 70.
TEMP 2 96 70.
TEMP 2 97 70.
TEMP 2 98 70.
TEMP 2 99 70.
TEMP 2 100 70.
TEMP 2 101 70.
TEMP 2 102 70.
TEMP 2 103 70.
TEMP 2 104 70.
TEMP 2 105 70.
TEMP 2 106 70.
TEMP 2 107 70.
TEMP 2 108 70.
TEMP 2 109 70.
TEMP 2 110 70.
TEMP 2 111 70.
TEMP 2 112 70.
TEMP 2 113 70.
TEMP 2 114 70.
TEMP 2 115 70.
TEMP 2 116 70.
TEMP 2 117 70.
TEMP 2 118 70.
TEMP 2 119 70.
TEMP 2 120 70.
TEMP 2 121 70.
TEMP 2 122 70.
TEMP 2 123 70.
TEMP 2 124 70.
TEMP 2 125 70.
TEMP 2 126 70.
TEMP 2 127 70.
TEMP 2 128 70.
TEMP 2 129 70.
TEMP 2 130 70.
TEMP 2 131 70.
TEMP 2 132 70.
TEMP 2 133 70.
TEMP 2 134 70.
TEMP 2 135 70.
TEMP 2 136 70.
TEMP 2 137 70.
TEMP 2 138 70.
TEMP 2 139 70.
TEMP 2 140 70.
TEMP 2 141 70.
TEMP 2 142 70.
TEMP 2 143 70.
TEMP 2 144 70.
TEMP 2 145 70.
TEMP 2 146 70.
TEMP 2 147 70.
TEMP 2 148 70.
TEMP 2 149 70.
TEMP 2 150 70.
TEMP 2 151 70.
TEMP 2 152 70.
TEMP 2 153 70.
TEMP 2 154 70.
TEMP 2 155 70.
TEMP 2 156 70.
TEMP 2 157 70.
TEMP 2 158 70.
TEMP 2 159 70.
TEMP 2 160 70.
TEMP 2 161 70.
TEMP 2 162 70.
TEMP 2 163 70.
TEMP 2 164 70.
TEMP 2 165 70.
TEMP 2 166 70.
TEMP 2 167 70.
TEMP 2 168 70.
TEMP 2 169 70.
TEMP 2 170 70.
TEMP 2 171 70.
TEMP 2 172 70.
TEMP 2 173 70.
TEMP 2 174 70.
TEMP 2 175 70.
TEMP 2 176 70.
TEMP 2 177 70.
TEMP 2 178 70.
TEMP 2 179 70.
TEMP 2 180 70.
TEMP 2 181 70.
TEMP 2 182 70.
TEMP 2 183 70.
TEMP 2 184 70.
TEMP 2 185 70.
TEMP 2 186 70.
TEMP 2 187 70.
TEMP 2 188 70.
TEMP 2 189 70.
TEMP 2 190 70.
TEMP 2 191 70.
TEMP 2 192 70.
TEMP 2 193 70.
TEMP 2 194 70.
TEMP 2 195 70.
TEMP 2 196 70.
TEMP 2 197 70.
TEMP 2 198 70.
TEMP 2 199 70.
TEMP 2 200 70.
TEMP 2 201 70.
TEMP 2 202 70.
TEMP 2 203 70.
TEMP 2 204 70.
TEMP 2 1 250.
TEMP 2 2 250.
TEMP 2 3 250.
TEMP 2 4 250.
TEMP 2 205 250.
TEMP 2 206 250.
TEMP 2 207 250.
TEMP 2 208 250.
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CHEXA 1 3 9 10 11 12 5 6+
+ 7 8
CHEXA 2 2 13 14 15 16 9 10+
+ 11 12
CHEXA 3 2 17 18 19 20 13 14+
+ 15 16
CHEXA 4 3 21 22 23 24 17 18+
+ 19 20
CHEXA 5 2 25 26 27 28 21 22+
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CHEXA 6 2 29 30 31 32 25 26+
+ 27 28
CHEXA 7 3 33 34 35 36 29 30+
+ 31 32
CHEXA 8 2 37 38 39 40 33 34+
+ 35 36
CHEXA 9 2 41 42 43 44 37 38+
+ 39 40
CHEXA 10 3 45 46 47 48 41 42+
+ 43 44
CHEXA 11 2 49 50 51 52 45 46+
+ 47 48
CHEXA 12 2 53 54 55 56 49 50+
+ 51 52
CHEXA 13 3 57 58 59 60 53 54+
+ 55 56
CHEXA 14 2 61 62 63 64 57 58+
+ 59 60
CHEXA 15 2 65 66 67 68 61 62+
+ 63 64
CHEXA 16 3 69 70 71 72 65 66+
+ 67 68
CHEXA 17 2 73 74 75 76 69 70+
+ 71 72
CHEXA 18 2 77 78 79 80 73 74+
+ 75 76
CHEXA 19 3 81 82 83 84 77 78+
+ 79 80
CHEXA 20 2 85 86 87 88 81 82+
+ 83 84
CHEXA 21 2 89 90 91 92 85 86+
+ 87 88
CHEXA 22 3 93 94 95 96 89 90+
+ 91 92
CHEXA 23 2 97 98 99 100 93 94+
+ 95 96
CHEXA 24 2 101 102 103 104 97 98+
+ 99 100
CHEXA 25 3 105 106 107 108 101 102+
+ 103 104
CHEXA 26 2 109 110 111 112 105 106+
+ 107 108
CHEXA 27 2 113 114 115 116 109 110+
+ 111 112
CHEXA 28 3 117 118 119 120 113 114+
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CHEXA 29 2 121 122 123 124 117 118+
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CHEXA 30 2 125 126 127 128 121 122+
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CHEXA 31 3 129 130 131 132 125 126+
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CHEXA 32 2 133 134 135 136 129 130+
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CHEXA 33 2 137 138 139 140 133 134+
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CHEXA 34 3 141 142 143 144 137 138+
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CHEXA 35 2 145 146 147 148 141 142+
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CHEXA 36 2 149 150 151 152 145 146+
+ 147 148
CHEXA 37 3 153 154 155 156 149 150+
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CHEXA 38 2 157 158 159 160 153 154+
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CHEXA 39 2 161 162 163 164 157 158+
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CHEXA 40 3 165 166 167 168 161 162+
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CHEXA 41 2 169 170 171 172 165 166+
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CHEXA 42 2 173 174 175 176 169 170+
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CHEXA 43 3 177 178 179 180 173 174+
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CHEXA 44 2 181 182 183 184 177 178+
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CHEXA 45 2 185 186 187 188 181 182+
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CHEXA 46 3 189 190 191 192 185 186+
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CHEXA 47 2 193 194 195 196 189 190+
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CHEXA 48 2 197 198 199 200 193 194+
+ 195 196
CHEXA 49 3 201 202 203 204 197 198+
+ 199 200
CHEXA 50 5 5 6 7 8 1 2+
+ 3 4
CHEXA 51 4 205 206 207 208 201 202+
+ 203 204
ENDDATA 707054dc