Boundary conditions > Simulation objects > Simcenter 3D Thermal/Flow, Electronic Systems Cooling, and Space Systems Thermal simulation objects > Thermal Coupling — Radiation
Create a Thermal Coupling — Radiation
Choose Home tab→Loads and Conditions group→Thermal Coupling — Radiation .
In the Thermal Coupling — Radiation dialog box, select either Gap Radiation or Object to Object Radiation from the Type list.
Select a Primary Region and a Secondary Region of the model.
In the Parameters group, select an option from the Type list and type a value in any associated box.
For Gap Radiation, select the Overlap Projection Direction, or clear the Only Connect Overlapping Elements if your geometry requires it.
Click OK.
Learn more
Understanding the Gap Radiation type of Thermal Coupling — Radiation
Understanding the Object to Object type of Thermal Coupling — Radiation
Inputs to expressions
Specifying a Coupling Resolution
Using the Only Connect Overlapping Elements option
Using the Overlap Projection Direction option
Look up more details
Auto-generated expressions
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Simcenter 3D Thermal/Flow, Electronic Systems Cooling, and Space Systems Thermal boundary conditions
Thermal/Flow, Electronic Systems Cooling, and Space Systems Thermal
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Create a Thermal Coupling — Radiation, Simcenter 3D 2021.1 Series
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Source: https://docs.sw.siemens.com/en-US/doc/289054037/PL20200601120302950.advanced/id632081 · retrieved 2026-07-17