FEM ConstraintBodyHeatSource

Description

Defines an internally generated body heat given in W/kg.

1.0 and above: Can also define the heat source in W.

Heat sink with a chip underneath serving as a body heat source

Usage

1. There are several ways to invoke the command:
   • Press the Body Heat Source button.
   • Select the Model → Thermal Boundary Conditions and Loads → Body Heat Source option from the menu.
2. 0.21 and above: Press the Add button. For a 3D analysis, select a 'solid' (body) from your model, for a 2D analysis select a face. introduced in 1.1: To remove objects from the selection, press the Remove button.
3. Set the value:
   • 0.20 and below: Since the tool has no task dialog, use the property editor and set the property DataHeat Source.
   • introduced in 0.21: Enter the body heat in W/kg.
   • 1.0 and above: Select the mode:
     • Dissipation Rate - enter the dissipation rate in W/kg .
     • Total Power - enter the total power in W.

Limitations

• 0.20 and below: The body heat source is applied to the whole model, meaning all bodies of the setup. It is not possible to select an individual body.
• 0.21 and below: This feature only works with the Elmer solver.

Notes

• For more information see this forum thread and following posts. This thread may also be useful.
• Elmer examples can also be found in Elmer GUI Tutorials.
• 1.0 and above: This feature uses the *DFLUX card in CalculiX.
• 1.0 and above: Since CalculiX expects body heat flux input in W/mm^3 while for Elmer it's W/kg, the conversion of the specified value (in W or W/kg) is done internally for each solver, using the volume of the selected solid and the density of the material assigned to it, if needed.