Home / Examples / Thermal Analysis [Watt] / Example 25: Periodic Boundary

Example 25: Periodic Boundary

General

• The thermal analysis using the periodic boundaries is explained here.
   

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

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

 

• Obtain this session's project file. (Right-click and choose 'Save link as')




• Results will vary depending on Femtet version and the PC environment.

 

Analysis Conditions

Item	Settings
Solver	Thermal Analysis [Watt]
Analysis Space	3D
Analysis Type	Steady-state Analysis
Unit	mm
Analysis Options	None

Model

 

 

 

Body Attributes and Materials

Body Number/Type	Body Attribute Name	Material Name	Mesh Size
0/Solid	SUB	006_Glass_epoxy *1
1/Solid	GND	008_Cu *1
2/Solid	MAINCHIP	001_Alumina *2
3/Solid	SUBCHIP	001_Alumina *2
4/Solid	HOLE	008_Cu *1	0.5
5/Solid	HOLE	008_Cu *1	0.5
6/Solid	HOLE	008_Cu *1	0.5
7/Solid	HOLE	008_Cu *1	0.5
8/Solid	HOLE	008_Cu *1	0.5
9/Solid	HOLE	008_Cu *1	0.5
10/Solid	HOLE	008_Cu *1	0.5
11/Solid	HOLE	008_Cu *1	0.5

*1 Available from the material DB.

Boundary Condition

Boundary Condition Name/Topology	Tab	Boundary Condition Type	Setting
Outer Boundary Condition	Thermal	Heat Transfer/Convection	Natural Convection (Automatic Coefficient Calculation) Room Temperature: 25 [deg]
t40	Thermal	Temperature	40 [deg]
Periodic1	Symmetry/Continuity	Periodic
Periodic2	Symmetry/Continuity	Periodic

 

“Periodic1” and “Periodic2” are set to be a periodic boundary pair.

 

Select [Natural Convection (Automatic Coefficient Calculation)] on the outer boundary condition.

* The correction coefficient for the natural convection is calculated automatically. See [Heat Transfer: Ambient Radiation] for more information.

Results

The temperature diagram is shown as below.

 

 

You can see the temperature is the same on the faces with periodic boundaries.