Specifying Thermal and Radiative Boundary Conditions
You set thermal and radiative conditions for the regions' boundaries. You specify the radiative conditions by assigning surface materials to the boundaries. At the walls of the opaque and transparent components, you set a convective condition.
Between the connector support and the rear housing, a gap reduces the heat transfer. To model the gap, you set a contact resistance at the interface.
To specify thermal and radiative conditions:
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Specify the boundary conditions and values for the Air
region:
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Multi-edit the following region nodes:
- Air > Boundaries > Opaque Components/Air [1]
- Air > Boundaries > Transparent Components/Air [1]
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Expand the Physics Values node and set the following properties:
Node Property Setting Surface Material Specify by Part Subgroup Activated By Contact Subgroup
Halogen Bulb/Air
Surface Material Halogen Bulb Lens/Air
Surface Material Lens Rear Housing/Air
Surface Material Reflector - Click Close.
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Multi-edit the following region nodes:
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Specify the boundary conditions and values for the opaque components:
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Edit the Regions > Opaque Components > Boundaries node and set the following properties:
Node Property Setting Filament Physics Conditions
Thermal Specification
Condition Convection Physics Values
Ambient Temperature
Value ${Filament_Temperature} Heat Transfer Coefficient
Value 10000.0 W/m^2-K Node Property Setting Walls Physics Condition
Thermal Specification
Condition Convection Physics Values
External Surface Material
Surface Material Headlamp Back Heat Transfer Coefficient
Value 20.0 W/m^2-K For the Walls boundary, which represents the back of the headlamp, an external surface emissivity of zero is assumed, indicating that the boundary does not contribute to external radiation.
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Edit the Regions > Opaque Components > Boundaries node and set the following properties:
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Specify the boundary conditions and values for the transparent
components:
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Edit the Regions > Transparent Components > Boundaries > Transparent Components/Air [0] node and set the following properties:
Node Property Setting Physics Values Surface Material
Specify by Part Subgroup Activated By Contact Subgroup
Halogen Bulb/Air
Surface Material Halogen Bulb Lens/Air
Surface Material Lens -
Edit the Regions > Transparent Components > Boundaries > Walls node and set the following properties:
Node Property Setting Physics Conditions Thermal Specification
Condition Convection Physics Values External Surface Material
Specify by Part Subgroup Activated By Surface Subgroup
Halogen Bulb
Surface Material Halogen Bulb Lens
Surface Material Lens Heat Transfer Coefficient
Method By Surface Subgroup By Surface Subgroup
Lens
Value 20.0 W/m^2-K Surface Material
Specify by Part Subgroup Activated By Surface Subgroup
Halogen Bulb
Surface Material Halogen Bulb Lens
Surface Material Lens
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Edit the Regions > Transparent Components > Boundaries > Transparent Components/Air [0] node and set the following properties:
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Edit the Interfaces > Opaque Components/Opaque Components > Physics Values node and set the following properties:
Node Property Setting Contact Resistance Method By Contact Subgroup By Contact Subgroup
Rear Housing/Connector Support
Value 2000.0 m^2-K/W - Save the simulation.