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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

  1. Choose Home tab→Loads and Conditions group→Thermal Coupling — Radiation .

  2. In the Thermal Coupling — Radiation dialog box, select either Gap Radiation or Object to Object Radiation from the Type list.

  3. Select a Primary Region and a Secondary Region of the model.

  4. In the Parameters group, select an option from the Type list and type a value in any associated box.

  5. For Gap Radiation, select the Overlap Projection Direction, or clear the Only Connect Overlapping Elements if your geometry requires it.

  6. 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