The model is the same as Exercise 5: The heat radiation from an aluminum plate is analyzed. This is a transient analysis.
The temperature distribution and the heat flux vectors are solved.
Unless specified in the list below, the default conditions will be applied.
Item 
Settings 
Analysis Space 
3D 
Model unit 
mm 
Item 
Settings 
Solvers 
Thermal Analysis [Watt] 
Analysis Type 
Transient analysis 
Options 
N/A 
The transient analysis is set up in transient tab as follows. The total number of steps is 30. The time step is 10 second.
Therefore, the temperature distributions for 300 seconds are solved.
Tab 
Setting Item 
Settings 

Transient analysis 
Table 


Initial Temperature 
25[deg] 
The same as Exercise 5. The material properties and the boundary conditions are the same as well.
Aluminum plate, defined by a rectangular solid body, is placed vertically. The bottom face is set with the Temperature boundary condition.
The other faces are set with the Heat transfer/Ambient radiation boundary condition.
Body Number/Type 
Body Attribute Name 
Material Name 
0/Solid 
VOL1 
404 PureAl1100 * 
* Available from the Material DB
The coefficient for the natural convection is calculated as follows. See [Heat Transfer/Ambient Radiation] for more information.
The coefficient can be calculated automatically if that is preferred.
2.51×C×（1/L)＾（1/4） = 2.50 [W/m2/deg5/4]
where
C = 0.56
L = 0.1
Boundary Condition Name/Topology 
Tab 
Boundary Condition Type 
Settings 
Temp/Face 
Thermal 
Temperature 
80[deg] 
Outer Boundary Condition 
Thermal 
Heat Transfer/Ambient Radiation 
Natural convection: 2.50[W/m2/deg5/4] Room Temperature : 25[deg] 
The temperature distributions in 20 sec, 60 sec and 120 sec are shown below.
At Minimum/Maximum Value on the Contour tab of [Graphics Setup], deselect “Automatic” and set 25 => 80.
The heat creeps up as the time goes by.
The chart below shows the temperature of the tip of the plate.
It is getting stabilized in 200 seconds.