CAE Software【Femtet】Murata Software Co., Ltd.
Example2 Temperature Distribution of Two Rods(Transient Analysis)
General
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Two square rods with different thermal conductivities are placed closely and subjected to the common temperature boundary condition.
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The temperature distribution and the heat flux vectors are solved under the transient condition.
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Unless specified in the list below, the default conditions will be applied.
Analysis Space
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Item |
Settings |
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Analysis Space |
3D |
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Model unit |
mm |
Analysis Conditions
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Item |
Settings |
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Solver |
Thermal Analysis [Watt] |
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Analysis Type |
Transient analysis |
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Options |
N/A |
The transient analysis is set up as follows. The total number of steps is 130. The time step is 1 second.
Therefore, the temperature distributions for 130 seconds are solved.
The output interval is changed from 1 in the first 10 steps to 5 in the steps to follow.
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Tabs |
Setting Item |
Settings |
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Transient analysis |
Table |
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Initial Temperature |
0[deg] |
Model
The same as Exercise 1. The body attributes, the material properties and the boundary conditions are the same as well.
Two box-shape solid bodies are created. One is gold and the other is stainless steel. Their thermal conductivities are different.
The temperature boundary conditions are set on the top and bottom faces.
Body Attributes and Materials
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Body Number/Type |
Body Attribute Name |
Material Name |
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0/Solid |
VOL1 |
002_Au * |
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1/Solid |
VOL2 |
500_SUS301 * |
* Available from the Material DB
Boundary Conditions
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Boundary Condition Name/Topology |
Tab |
Boundary Condition Type |
Settings |
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Top/Face |
Heat |
Temperature |
100[deg] |
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Bottom/Face |
Heat |
Temperature |
0[deg] |
Results
The temperature distributions in 5 sec, 60 sec and 130 sec are shown below.
In 5 seconds
There is a huge difference between the temperature distributions of gold and SUS. This is due to the difference of the thermal conductivity.
In 60 seconds
Even in 60 seconds, the temperature distribution of SUS has not reached that of gold of 5 seconds yet.
In 130 seconds
The temperature distribution of SUS is getting close to that of gold.