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

Analysis Conditions

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.

* Available from the Material DB

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

Boundary Conditions

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 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.