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# Example25Periodic 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.

### Analysis Conditions

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

### 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/Ambient radiation Natural convection (automatic calculation) Room temperature: 25[deg] t40 Thermal Temperature 40[deg] Periodic1 Symmetry/Continuity Periodic Periodic2 Symmetry/Continuity Periodic

[Periodic1] and [Periodic2] are set periodic boundary pair.

Select “Natural convection (automatic 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.

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