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# Example2Temperature Distribution of Two Rods(Transient Analysis)

General

• Two square rods with different thermal conductivities are placed closely and subjected to the common temperature boundary condition.

• The temperature distribution and the heat flux vectors are solved under the transient condition.

• Unless specified in the list below, the default conditions will be applied.

### Analysis Space

 Item Settings Analysis Space 3D Model unit mm

### Analysis Conditions

 Item Settings Solver Thermal Analysis [Watt] Analysis Type Transient analysis 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.

Tabs

Setting Item

Settings

Transient analysis

Table

 Number Calculation steps Output steps Time step [s] 1 10 1 1.0 2 120 5 1.0

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

 Body Number/Type Body Attribute Name Material Name 0/Solid VOL1 002_Au * 1/Solid VOL2 500_SUS301 *

* Available from the Material DB

### Boundary Conditions

 Boundary Condition Name/Topology Tab Boundary Condition Type Settings Top/Face Heat Temperature 100[deg] 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.

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