Natural Convection with Correction Coefficient Automatically Calculatedexamples|products|Murata Software Co., Ltd.

Example14 Natural Convection with Correction Coefficient Automatically Calculated

General

  • Two heat sources are placed on a substrate. The heat is released to the ambient by natural convection.
    The steady-state analysis is performed.
     

  • The correction coefficient is calculated automatically based on the model shape.
     

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

  • 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

Steady-state analysis

Options

N/A

Model

  • To use the boundary condition of “Natural convection (automatic calculation)”, the model must be oriented so that the negative Z direction points the ground.

 

Body Attributes and Materials

The finer mesh size is set for via holes (HOLE), where the heat flux is expected to change drastically.

Body Number/Type

Body Attribute Name

Material Name

Mesh Size

0/Solid

SUB

006_Glass_epoxy *

 

1/Solid

GND

008_Cu *

 

2/Solid

MAINCHIP

001_Alumina *

 

3/Solid

SUBCHIP

001_Alumina *

 

4/Solid

HOLE

008_Cu *

0.5

5/Solid

HOLE

008_Cu *

0.5

6/Solid

HOLE

008_Cu *

0.5

7/Solid

HOLE

008_Cu *

0.5

8/Solid

HOLE

008_Cu *

0.5

9/Solid

HOLE

008_Cu *

0.5

10/Solid

HOLE

008_Cu *

0.5

11/Solid

HOLE

008_Cu *

0.5

* Available from the Material DB

 

The heat sources of MAINCHIP and SUBCHIP are set up as follows.

Body Attribute Name

Tab

Settings

MAINCHIP

Heat Source

0.2[W]

SUBCHIP

Heat Source

0.1[W]

Boundary Conditions

Select “Natural convection (automatic calculation)” on the outer boundary condition.

 

Boundary Condition Name/Topology

Tab

Boundary Condition Type

Settings

Outer Boundary Condition

Thermal

Heat Transfer/Ambient Radiation

Natural convection (automatic calculation)

Room temperature: 25[deg]

 

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

 

Results

The temperature distribution is shown below.


The temperature of MAINCHIP is the highest.

 

The vectors of the heat flux are shown below.

The heat is well transfered through the via holes.